Relevant bibliographies by topics / Desert climate

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Desert climate'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 August 2024

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Journal articles on the topic "Desert climate"

1

Port, U., and M. Claussen. "Transitivity of the climate–vegetation system in a warm climate." Climate of the Past 11, no. 11 (November 25, 2015): 1563–74. http://dx.doi.org/10.5194/cp-11-1563-2015.

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Abstract. To date, the transitivity of the global system has been analysed for late Quaternary (glacial, interglacial, and present-day) climate. Here, we extend this analysis to a warm, almost ice-free climate with a different configuration of continents. We use the Earth system model of the Max Planck Institute for Meteorology to analyse the stability of the climate system under early Eocene and pre-industrial conditions. We initialize the simulations by prescribing either dense forests or bare deserts on all continents. Starting with desert continents, an extended desert remains in central Asia in the early Eocene climate. Starting with dense forest coverage, the Asian desert is much smaller, while coastal deserts develop in the Americas which appear to be larger than in the simulations with initially bare continents. These differences can be attributed to differences in the large-scale tropical circulation. With initially forested continents, a stronger dipole in the 200 hPa velocity potential develops than in the simulation with initially bare continents. This difference prevails when vegetation is allowed to adjust to and interact with climate. Further simulations with initial surface conditions that differ in the region of the Asian desert only indicate that local feedback processes are less important in the development of multiple states. In the interglacial, pre-industrial climate, multiple states develop only in the Sahel region. There, local climate–vegetation interaction seems to dominate.
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Port, U., and M. Claussen. "Stability of the vegetation–atmosphere system in the early Eocene climate." Climate of the Past Discussions 11, no. 3 (May 5, 2015): 1551–78. http://dx.doi.org/10.5194/cpd-11-1551-2015.

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Abstract. We explore the stability of the atmosphere–vegetation system in the warm, almost ice-free early Eocene climate and in the interglacial, pre-industrial climate by analysing the dependence of the system on the initial vegetation cover. The Earth system model of the Max Planck Institute for Meteorology is initialised with either dense forests or bare deserts on all continents. Starting with desert continents, an extended desert remains in Central Asia in early Eocene climate. Starting with dense forest coverage, this desert is much smaller because the initially dense vegetation cover enhances water recycling in Central Asia relative to the simulation with initial deserts. With a smaller Asian desert, the Asian monsoon is stronger than in the case with a larger desert. The stronger Asian monsoon shifts the global tropical circulation leading to coastal subtropical deserts in North and South America which are significantly larger than with a large Asian desert. This result indicates a global teleconnection of the vegetation cover in several regions. In present-day climate, a bi-stability of the atmosphere–vegetation system is found for Northern Africa only. A global teleconnection of bi-stabilities in several regions is absent highlighting that the stability of the vegetation–atmosphere system depends on climatic and tectonic boundary conditions.
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Zhu, Bingqi, and Limin Yang. "Desertification and Related Climate Change in the Alashan Plateau since the Last 40 ka of the Last Glacial Period." Atmosphere 14, no. 2 (February 15, 2023): 384. http://dx.doi.org/10.3390/atmos14020384.

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Clues of climate change on the Alashan Plateau since the last glacial period (40 ka) are important for revealing the mechanism of desertification of middle-latitude deserts in the Northern Hemisphere (NH). Studies are still rare for the understanding of the specific relationship of climate changes between the Alashan Plateau and the global. Based on a systematic and comparative analysis of the existing research in China and the international academic community, this paper reviews the environmental evolution history of the Alashan Plateau since the last glacial period from the records of paleo-environment and geomorphological characteristics in different deserts of the plateau (e.g., Badanjilin, Tenggeli, and Wulanbuhe). From about 40 ka to the end of the last glacial maximum, the climate on the plateau was wetter than it is today, and to the end of the Pleistocene, the climate was generally dry and the aeolian activities were enhanced. However, the climate was arid during the whole last glacial period in the Wulanbuhe Desert, evidently different from the overall pattern of the plateau. The Tenggeli Desert was characterized by an arid climate in the early Holocene. The most controversial events for the Alashan Plateau are the drought events in the middle Holocene in the Badanjilin Desert. The role and impact of the westerlies and the East Asian Summer Monsoon (EASM) systems on the climate change of the desert and even the whole plateau is a vexed question that brings different views in different periods. There is still a lack of definite evidence representing the events of global environmental change that occurred on the plateau during the discussed period. The distinctive morphology of dune mountains and the distribution of sand dunes are mutually indicative of the direction and energy of wind systems on the plateau. It is suggested that appropriate wind energy is the significant key to the desertification in these middle-latitude deserts on the plateau. From a global-scale review of climate change, the desertification of the modern-scale sandy desert landscapes on the Alashan Plateau is generally related to the global glacial period and the cold and dry climate during the past 40 ka.
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Liu, Xiaoyu, and Liangjie Xin. "China’s deserts greening and response to climate variability and human activities." PLOS ONE 16, no. 8 (August 30, 2021): e0256462. http://dx.doi.org/10.1371/journal.pone.0256462.

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Vegetation, which is a good indicator of the impacts of climate variability and human activities, can reflect desert ecosystem dynamics. To reveal the vegetation variations in China’s deserts, trends in the monthly, seasonal, and annual normalized difference vegetation index (NDVI) from 2000 to 2017 were measured both temporally and spatially by the Theil-Sen estimator and Mann-Kendall test. Additionally, correlation coefficients and residual analysis were employed to evaluate the correlations between the NDVI and climatic factors and to distinguish the impacts of climate variability and human activities. The results showed that China’s deserts underwent greening. The annual NDVI showed a significant increasing trend at a rate of 0.0018/yr, with values of 0.094 in 2000 and 0.126 in 2017. Significant increasing trends in NDVI were observed in all four seasons. The NDVI were higher in summer and autumn than in spring and winter. Both the monthly NDVI and its trends showed an inverted U-shaped curve during the year. Spatially, the greening trends were mainly distributed on the southern edge of the Gurbantunggut Desert, in the northwestern part of the Taklimakan Desert, and in the Kubuqi Desert. The correlations between the NDVI and climatic factors at the monthly and seasonal scales were stronger than those at the annual scale. Temperature and precipitation had positive effects on NDVI at the monthly and seasonal scales, but only precipitation had a positive effect at the annual scale. Human activities, especially oasis expansion and sand stabilization measures, were two major causes of large increasing areas of desert greening in China indicated by the NDVI.
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Kerley, GIH, and WG Whitford. "Desert-Dwelling Small Mammals as Granivores - Intercontinental Variations." Australian Journal of Zoology 42, no. 4 (1994): 543. http://dx.doi.org/10.1071/zo9940543.

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Deserts are, by definition, environmentally similar, and this has lead to hypotheses of convergence in the properties of desert biotic communities as well as the components of these communities. There is considerable evidence for convergence in some characteristics of desert biota, ranging from plant growth forms to the well-known bipedal, nocturnal rodents. One area that has received considerable attention has been granivory by desert rodents, largely because of the effort focused on the North American desert heteromyids, and also because the process of granivory has far-reaching ramifications for desert plant communities. Specific tests for convergence in the impact of rodents as granivores, by means of bait-removal experiments, however, have shown that the high levels of seed removal by rodents in the North American deserts differs from that of rodents in the South American, Australian and South African deserts, where ants are the most important seed harvesters. The only studies to measure the impact of rodents on desert seed fluxes confirm these patterns, with rodents consuming up to 86% of seed production in North American deserts, but less than 1% of seed production in South African deserts. A review of dietary data for desert rodents confirms these trends, with little evidence for the presence of granivores in deserts besides those of North America. A variety of hypotheses have attempted to explain these variations in desert rodent granivory. These include recent extinctions of granivores, that seed burial, low soil nutrients and/or limiting seed production prevented the radiation of granivorous small mammals, and that particular deserts are too young or too recently colonised by rodents for granivorous rodents to have evolved. However, none of these hypotheses are supported by available evidence. Alternative hypotheses suggesting that climate variability may have precluded the development of specialised granivores need to be tested. In particular, more data are needed to confirm these patterns of granivory, and gain an understanding of the effects of Pleistocene and recent desert climate variability on seed production. An alternative perspective suggests that the presence of the heteromyid rodents may explain the high levels of granivory by small mammals in North American deserts. The variability in granivory by small mammals between deserts suggests that deserts will also differ in terms of anti-granivore adaptations of plants, seed fluxes and the mechanisms whereby small mammals coexist.
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Sosa, Victoria, Israel Loera, Diego F. Angulo, Marilyn Vásquez-Cruz, and Etelvina Gándara. "Climate change and conservation in a warm North American desert: effect in shrubby plants." PeerJ 7 (March 7, 2019): e6572. http://dx.doi.org/10.7717/peerj.6572.

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Background Deserts are biologically rich habitats with a vast array of animals and plants adapted to xeric conditions, and most deserts are among the planet’s last remaining areas of total wilderness. Among North American deserts, the Chihuahuan Desert has the highest levels of diversity and endemism. To understand the effect of future climate change on plants distributed in this arid land and propose effective conservation planning, we focused on five endemic shrubby species that characterize the Chihuahuan Desert and used an integrative approach. Methods Ecological niche-based modeling, spatial genetics and ecological resistance analyses were carried out to identify the effect of global warming on the studied five shrubby species. Key areas that need to be preserved were identified taking into account the existing protected areas within the Chihuahuan Desert. Results The extent of future distribution will vary among these species, and on average expansion will occur in the western part of the Chihuahuan Desert. For most species low environmental resistance to gene flow was predicted, while higher future resistance was predicted for one species that would lead to increased population isolation. The highest haplotype diversity was identified in three hotspots. Based on future suitability of habitat and in the haplotype diversity we suggest preserving two hotspots of genetic diversity in the Sierra Madre Oriental, located in areas without protection. The third hotspot was detected in the well preserved Tehuacán-Cuicatlán Man and Biosphere Reserve. Conclusion Global climate change will have an effect in arid adapted plants, favoring expansion in the western of the Chihuahuan Desert however negatively affecting others with high ecological resistance disrupting gene flow. Two hotspots of genetic diversity in the Sierra Madre Oriental should be protected.
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Wu, G. X., Y. Liu, X. Zhu, W. Li, R. Ren, A. Duan, and X. Liang. "Multi-scale forcing and the formation of subtropical desert and monsoon." Annales Geophysicae 27, no. 9 (September 29, 2009): 3631–44. http://dx.doi.org/10.5194/angeo-27-3631-2009.

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Abstract. This study investigates three types of atmospheric forcing across the summertime subtropics that are shown to contribute in various ways to the occurrence of dry and wet climates in the subtropics. To explain the formation of desert over the western parts of continents and monsoon over the eastern parts, we propose a new mechanism of positive feedback between diabatic heating and vorticity generation that occurs via meridional advection of planetary vorticity and temperature. Monsoon and desert are demonstrated to coexist as twin features of multi-scale forcing, as follows. First, continent-scale heating over land and cooling over ocean induce the ascent of air over the eastern parts of continents and western parts of oceans, and descent over eastern parts of oceans and western parts of continents. Second, local-scale sea-breeze forcing along coastal regions enhances air descent over eastern parts of oceans and ascent over eastern parts of continents. This leads to the formation of the well-defined summertime subtropical LOSECOD quadruplet-heating pattern across each continent and adjacent oceans, with long-wave radiative cooling (LO) over eastern parts of oceans, sensible heating (SE) over western parts of continents, condensation heating (CO) over eastern parts of continents, and double dominant heating (D: LO+CO) over western parts of oceans. Such a quadruplet heating pattern corresponds to a dry climate over the western parts of continents and a wet climate over eastern parts. Third, regional-scale orographic-uplift-heating generates poleward ascending flow to the east of orography and equatorward descending flow to the west. The Tibetan Plateau (TP) is located over the eastern Eurasian continent. The TP-forced circulation pattern is in phase with that produced by continental-scale forcing, and the strongest monsoon and largest deserts are formed over the Afro-Eurasian Continent. In contrast, the Rockies and the Andes are located over the western parts of their respective continents, and orography-induced ascent is separated from ascent due to continental-scale forcing. Accordingly, the deserts and monsoon climate over these continents are not as strongly developed as those over the Eurasian Continent. A new mechanism of positive feedback between diabatic heating and vorticity generation, which occurs via meridional transfer of heat and planetary vorticity, is proposed as a means of explaining the formation of subtropical desert and monsoon. Strong low-level longwave radiative cooling over eastern parts of oceans and strong surface sensible heating on western parts of continents generate negative vorticity that is balanced by positive planetary vorticity advection from high latitudes. The equatorward flow generated over eastern parts of oceans produces cold sea-surface temperature and stable stratification, leading in turn to the formation of low stratus clouds and the maintenance of strong in situ longwave radiative cooling. The equatorward flow over western parts of continents carries cold, dry air, thereby enhancing local sensible heating as well as moisture release from the underlying soil. These factors result in a dry desert climate. Over the eastern parts of continents, condensation heating generates positive vorticity in the lower troposphere, which is balanced by negative planetary vorticity advection of the meridional flow from low latitudes. The flow brings warm and moist air, thereby enhancing local convective instability and condensation heating associated with rainfall. These factors produce a wet monsoonal climate. Overall, our results demonstrate that subtropical desert and monsoon coexist as a consequence of multi-scale forcing along the subtropics.
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Randall, JA. "Convergences and Divergences in Communication and Social-Organization of Desert Rodents." Australian Journal of Zoology 42, no. 4 (1994): 405. http://dx.doi.org/10.1071/zo9940405.

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Has behaviour of desert rodents evolved to show convergences in the same way as morphological and physiological traits? To answer this question, I compared social behaviour and communication of rodents from deserts in North America, Africa, Eurasia and Australia, Most desert rodents, except those from Australia, sandbathe and footdrum as primary modes of communication. In contrast, social behaviour in desert rodents has evolved across a wide spectrum of sociality. The most highly evolved social organisation in mammals occurs in two species of eusocial mole-rats from arid deserts in Africa, Asian gerbils live in stable family groups, and jerboas in northern Africa may be socially tolerant. The heteromyid rodents from North America, however, live alone in a social structure maintained by neighbour recognition. These communication convergences and social divergences may be explained by the evolutionary history of the rodents and by contrasts in resources, predation and climate. Mole-rats must cooperate to harvest dispersed underground tubers in arid environments. Varied diets and cold climates possibly selected for group living in the highly social gerbils. The long and successful evolution of heteromyid rodents as solitary granivores may explain why they have not taken the next step in social evolution.
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Cowan, Don A., S. Craig Cary, Jocelyne DiRuggiero, Frank Eckardt, Belinda Ferrari, David W. Hopkins, Pedro H. Lebre, et al. "‘Follow the Water’: Microbial Water Acquisition in Desert Soils." Microorganisms 11, no. 7 (June 27, 2023): 1670. http://dx.doi.org/10.3390/microorganisms11071670.

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Water availability is the dominant driver of microbial community structure and function in desert soils. However, these habitats typically only receive very infrequent large-scale water inputs (e.g., from precipitation and/or run-off). In light of recent studies, the paradigm that desert soil microorganisms are largely dormant under xeric conditions is questionable. Gene expression profiling of microbial communities in desert soils suggests that many microbial taxa retain some metabolic functionality, even under severely xeric conditions. It, therefore, follows that other, less obvious sources of water may sustain the microbial cellular and community functionality in desert soil niches. Such sources include a range of precipitation and condensation processes, including rainfall, snow, dew, fog, and nocturnal distillation, all of which may vary quantitatively depending on the location and geomorphological characteristics of the desert ecosystem. Other more obscure sources of bioavailable water may include groundwater-derived water vapour, hydrated minerals, and metabolic hydro-genesis. Here, we explore the possible sources of bioavailable water in the context of microbial survival and function in xeric desert soils. With global climate change projected to have profound effects on both hot and cold deserts, we also explore the potential impacts of climate-induced changes in water availability on soil microbiomes in these extreme environments.
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Andrade, C., and J. Contente. "Köppen’s climate classification projections for the Iberian Peninsula." Climate Research 81 (August 20, 2020): 71–89. http://dx.doi.org/10.3354/cr01604.

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Projections of Köppen-Geiger climate classifications under future climate change for the Iberian Peninsula are investigated using a 7-ensemble mean of regional climate models obtained from EURO-CORDEX. Maps with predicted future scenarios for temperature, precipitation and Köppen-Geiger classification are analyzed for RCP4.5 and RCP8.5 in Iberia. Widespread statistically significant shifts in temperature, precipitation and climate regimes are projected in the 2041-2070 period, with greater shifts occurring under RCP8.5. An overall increase in temperature and a decrease in precipitation in the south-southeast is predicted. Of the two climate types, dry (B) and temperate (C), the dominant one was C in 86% of Iberia for 1961-1990, predicted to decrease by 8.0% by 2041-2070 under RCP4.5 (9.5% under RCP8.5). The hot-summer Mediterranean climate (CSa) will progressively replace CSb (warm-summer climate) in the northwestern half of Iberia until 2070. This shift, depicted by the SSIM index, is particularly noticeable in Portugal, with the projected establishment of the CSa climate by 2041-2070. The predicted retreat of humid subtropical (Cfa) and temperate oceanic (Cfb) areas in the northeast towards the Pyrenees region is noteworthy, as is the increase of desert (BW) and semi-desert (BS) climates (7.8 and 9%) in the southeast (between Granada and Valencia). Climate types BSh and BWh (hot semi-desert and hot desert, respectively), non-existent in the 1961-1990 period, are projected to represent 2.8% of the territory in 2041-2070 under RCP4.5 (5% under RCP8.5). The statistically significant projected changes hint at the disappearance of some vegetation species in certain regions of Iberia, with an expected increase in steppe, bush, grassland and wasteland vegetation cover, typical of dry climates in the southeast.
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Dissertations / Theses on the topic "Desert climate"

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Hoyt, Cathryn A. "Grassland to desert : Holocene vegetation and climate change in the northern Chihuahuan Desert /." Digital version:, 2000. http://wwwlib.umi.com/cr/utexas/fullcit?p9992819.

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Fallahi, Esmaeil, Mike Kilby, and Phil Tilt. "Adaptation of Deciduous Fruit to the Desert Climate." College of Agriculture, University of Arizona (Tucson, AZ), 1986. http://hdl.handle.net/10150/215696.

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Chilling requirements and maturity of several varieties of peaches and apples were studied at the University of Arizona, Yuma Mesa Agricultural Center (Southwest Arizona) in 1985-1986. Flordared, Flordabelle, Flordabeauty, Flordagold, Desert Gold and Suwanee peaches broke their dormancy earlier than other cultivars and showed full bloom between mid-to-late January. Suwanee and Desert Gold matured earlier than other tested varieties, but they produced small size fruit with low sugar content. Anna and Dorsett Golden apples showed extended blooming period due to insufficient chilling.
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Al-Taie, Laith. "Performance of Clay Liners in Near-Surface Repositories in Desert Climate." Doctoral thesis, Luleå tekniska universitet, Geoteknologi, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-26615.

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Wars in Iraq (1991 and 2003) generated various types of hazardous waste (HW) in the form of soil contaminated by depleted uranium (DU). Other HW emanated from destroyed army vehicles and remnants of Iraqi nuclear facilities holding various types and amounts of chemical and radioactive material. The negative impact of the various wastes on the health conditions of the population was reported from different parts of Iraq, showing an enhanced frequency of cancer and abnormally born infants. For isolating the wastes, which represent low-level and short-lived intermediate level radioactive wastes, near-surface repositories (NSR) are proposed since they represent the least expensive way of solving future problems with sufficient safety. Internationally, the timeframe of the containment of such wastes is designated to be 300 years. Site selection affects and largely controls the selection of a suitable design the aim being to minimize or eliminate migration of hazardous elements from the waste to the environment. The formulation of siting criteria is the first vital step toward the resolution of the problem. Site selection criteria are proposed taking in account three major factors: environmental, geological and socio-economic factors. Accordingly, Iraqi deserts, which make up 60% of Iraq, represent the number one candidate for locating a safe disposal facility, primarily because of the low population, suitable topography, climatic conditions, seismic stability and availability of raw materials. Long-term performance of NSR is directly related to the function of top and bottom liner systems. They should be designed so that they are mutually compatible and combine to effectively isolate the waste. Liners are considered as the main elements of any disposal facility on the ground surface and a properly designed top liner system is of particular importance since it will minimize or eliminate water percolation into the waste body. Compacted clay liners (CCL) should preferably have with a low hydraulic conductivity, which is achievable by proper selection of raw materials, compaction density and construction methods. A further criterion is that they must not soften significantly by expansion on wetting, which puts a limit to the smectite content and density. The liners can consist of native material found near the landfill site, and be used after simple processing, primarily drying and crushing, or be mixed with fillers like silty sand. Since the hydraulic conductivity is the key property of a reliable CCL, relevant experimental determination of the hydraulic conductivity is vital. The common practice in geotechnical laboratories is to apply high hydraulic gradients for getting results quickly but this can lead to non-conservative, incorrect results. The present study involved determination of the hydraulic conductivity of a smectite-rich clay sampled at places within reasonable distance from potential NSR sites. Various hydraulic gradients were applied to samples compacted to several different densities, using two permeants and two filter types. It was concluded that the outflow filter can significantly affect the evaluated conductivity especially when applying high hydraulic gradients. This was partly explained by clogging of outflow filters of conventional fine-porous type by torn-off clay particles at such gradients. A major conclusion was that the gradient in laboratory testing should not exceed 100 m/m.In order to assess the suitability of available raw materials within the Iraqi Deserts, two smectitic soils termed as Green and Red clays were investigated for potential use in CCLs. Both clays are fairly rich in smectite, which calls for mixing them with properly graded silt/sand material from the desert for modifying the expandability. The shear strength, swelling pressure, hydraulic conductivity and creep properties were determined and used for defining criteria for selecting suitable clay-sand ratios. The results showed that 30-50% Green clay mixed with sand and 40-60% Red clay mixed with sand were suitable for constructing top liners with a hydraulic conductivity of 1×10-9 - 1×10-10 m/s. For bottom liners, 70% Green clay mixed with sand and 80% Red clay mixed with sand would be suitable; they were found to have a hydraulic conductivity of 1×10-11 m/s.The long-term performance of CCL is controlled by a number of processes like long periods of extreme dryness and short periods of very heavy rain. The percolation of water through the top liner system of a number of design alternatives were simulated using the code HELP 3.95D and subsequently by the FE program VADOSE/W. For the assumed NSR concept the slope stability of the top liner is essential and it was determined by using FE technique considering various slope angles. The engineering properties, primarily the hydraulic conductivity, swelling pressure and shear strength of 30-50% Green clay mixed with sand were introduced in the simulations. Two initial water contents of the compacted materials were considered representing 1) optimum water content (“wet case”), and 2) air‐dry conditions (“dry case”). Application of the HELP code decided the selection of suitable CCL having a thickness of 0.5 m and inclined by 5.7ᵒ. More detailed analyses with VADOSE/W showed that a mixture at the dry case would bring 0.5 mm (0.5 litre of leaking water per square meter) through CCL in an eight year simulation period. Long-term simulations (up to 300 years) showed that CCL would undergo continuous drying without reaching saturation even in the case of periods of very heavy rain (616 mm) for the wet and dry cases. The slope stability factor for the rather steep angle 30ᵒ was found to be 1.5 for the most critical case representing complete water saturation. In conclusion, the proposed materials and design features are believed to be suitable for practical application.
Godkänd; 2014; 20140924 (laikha); Nedanstående person kommer att disputera för avläggande av teknologie doktorsexamen. Namn: Laith Al-Taie Ämne: Geoteknik/Soil Mechanics and Foundation Engineering Avhandling: Performance of Clay Liners in Near-Surface Repositories in Desert Climate Opponent: Professor Frank Wagner, University of Trier, Department of Geology, Tyskland Ordförande: Professor Sven Knutsson, Avd för geoteknologi, Institutionen för samhällsbyggnad och naturresurser, Luleå tekniska universitet Tid: Onsdag den 3 december 2014, kl 13.00s Plats: F1031, Luleå tekniska universitet
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Lim, Sophak. "50,000 years of vegetation and climate change in the Namib Desert." Thesis, Montpellier, 2017. http://www.theses.fr/2017MONTT150/document.

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Cette thèse présente les données des pollens et micro-charbons fossiles couvrant la période des 50 000 dernières années à partir de sites sélectionnés transversalement nord-sud du désert de Namib. Dans le cadre de cette thèse, on utilise le rock hyrax middens, l’accumulation des boulettes et des urines fossilisés du Procavia capensis, représentant une excellente archive pour archives pour la préservation des pollens et micro-charbons à long-terme. Trois sites des hyrax middens ont été sélectionnés pour l'analyse: au sud du désert de Namib (Pella), la marge est des dunes de sable de Namib (Zizou) et le centre de la Namib (Spitzkoppe). En plus, le régime pluvial de ces sites se caractérise par une forte variabilité annuelle et interannuelle. En conséquence, tous ces sites se situent au long de l’écotone du Désert et du biome Nama-Karoo, ainsi qu'à l’est (biome de Savane). Alors que ces sites sont répertoriés dans des écosystèmes similaires, l’écotone, lui, est considéré comme une zone potentiellement très sensible au changement du système climatique régional. Un intérêt spécifique de ces enregistrements terrestres est pour évaluer s’ils corroborent ou s’opposent avec les résultats provenant ceux des sédiments marins de la côte namibienne, en particulier la conclusion : l’abondance des taxa dominants du Fynbos Biome du Cape peut indiquer significativement une expansion vers le nord de la flore du Cape pendant les périodes plus froides glaciaires. Selon les sites d’études sélectionnées, les conclusions principales de ce travail sont les suivantes:Les hyrax middens de Pella fournissent le premier enregistrement pollinique continué au sud du désert de Namib durant la période des 50 000 dernières années. Ces données polliniques ont permis de reconstruire le changement de la végétation et d'estimer la température et l'aridité. Les résultats indiquent que la période glaciaire se caractérise par une augmentation de la disponibilité de l'eau sur le site par rapport à l'Holocène. Les changements de la température et de l'évapotranspiration potentielle semblent avoir joué un rôle important dans la détermination de l'équilibre hydrologique.L'enregistrement de Zizou hyrax midden met en évidence des changements de la végétation à la marge l'est des dunes de sable depuis 38 000 ans cal BP. La végétation de la période glaciaire se caractérise par les pourcentages relativement élevés des Astéracées pollen, et plus particulièrement par des taxa du climat plus froid: Stoebe et Artemisia¬-type. En accord avec les données de Pella, le réchauffement au début de l'Holocène indiqué par la dominance de pollen des graminées dans l'assemblage pollinique suggère une expansion du biome de Désert.Les hyrax middens de Spitzkoppe enregistrent les changements de la végétation dans le centre du désert de Namib au cours des 32 000 dernières années. Les résultats sont globalement cohérents en comparant aux autres enregistrements terrestres dans la région. L'analyse de ces données n'est cependant pas encore terminée.Dans tous ces sites, une variabilité significative a été observée à la fois dans la dernière période glaciaire et l'Holocène. Les conditions plus froides de l'ère glaciaire semblent être caractérisées par une augmentation de la disponibilité de l'eau le long de la totalité de notre zone d'étude. Au contraire des résultats provenant des carottes marines, nos enregistrements indiquent aucune expansion de la végétation de Fynbos biome, et seulement des traces de Restionaceae pollen dans le site extrêmement au sud à Pella (pas plus de 1%), mais aucun trace de ce pollen n'ayant été observé à Zizou ainsi qu’à Spitzkoppe
This thesis presents fossil pollen and microcharcoal data during the last 50,000 years from a north-south transect of the Namib Desert. The arid environment of the Namib precludes the development of permanent wetlands, and as a result few palaeoenvironmental records exist from the region. In this study, we employ rock hyrax middens – fossilised accumulations of the faecal pellets and urine of the Procavia capensis. Hyrax middens from three sites were selected for analysis: the southern Namib (Pella), the eastern margin of Namib Sand Sea (Zizou), and the central Namib (Spitzkoppe). The results from these terrestrial sites are the extent to which they may corroborate or conflict with findings from pollen records obtained from marine sediments of the Namibian coast.The Pella hyrax middens provide the first continuous pollen record from the southern Namib Desert since the last 50,000 years, and are used to reconstruct vegetation change and quantitative estimates of temperature and aridity. Results indicate that the last glacial period was characterised by increased water availability relative to the Holocene. Changes in temperature and potential evapotranspiration appear to have played a significant role in determining the hydrologic balance. The record can be considered in two sections: 1) the last glacial period, when low temperatures favoured the development of more mesic Nama-Karoo vegetation at the site, with periods of increased humidity concurrent with increased coastal upwelling, both responding to lower global/regional temperatures; and 2) the Holocene, high temperatures and potential evapotranspiration resulted in increased aridity and an expansion of the Desert Biome.Considered in the context of discussions of forcing mechanisms of regional climate change and environmental dynamics, the results from Pella stand in clear contrast with many inferences of terrestrial environmental change derived from regional marine records. Observations of a strong precessional signal and interpretations of increased humidity during phases of high local summer insolation in the marine records are not consistent with the data from Pella. Similarly, while high percentages of Restionaceae pollen has been observed in marine sediments during the last glacial period, they do not exceed 1% of the assemblage from Pella, indicating that no significant expansion of the Fynbos Biome has occurred during the last 50,000 years.The Zizou hyrax midden highlights vegetation changes on the eastern margin of the Namib Sand Sea since 38,000 cal BP. Results show the different vegetation compositions between the last glacial period and the Holocene. Glacial vegetation characterised with relatively high percentages of Asteraceae pollen, particularly cool climate taxa such as Stoebe and Artemisia types. Similar to the data from Pella, with the onset of Holocene warming grass pollen comes to dominate the assemblage, suggesting an expansion of the Desert Biome. We suggest that the climate during the last glacial period was more humid, and supported the development of shrubs/small trees. Arid conditions during the Holocene saw the depletion of this resource, and the development of grasslands that could exploit the rare rains that the region experiences today. In common with the Pella record, no elements of the Cape flora are found in the Zizou middens.The Spitzkoppe hyrax middens record vegetation changes in the central Namib during the last 32,000 years. The last glacial vegetation compositions composed of Olea, Artemisia¬-type, Stoebe¬-type and grasses. In the Holocene, the arboreal taxa such as Olea was replaced by others like Eculea, Dombeya, Commiphora, and Croton¬-type with relative higher percentage of grasses at early Holocene
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Swartley, Joseph B. "Solar Development in the Mojave Desert." Scholarship @ Claremont, 2010. http://scholarship.claremont.edu/cmc_theses/74.

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For more than two centuries, humans have been spewing “greenhouse gases” into the atmosphere through the burning of fossil fuels, deforestation, and the development of land, causing the planet’s surface temperature to increase at an accelerated rate. Climate change is one of the most pressing issues that the world is facing today, and in order to combat the effects of climate change, it is necessary to adopt the use of more renewable technology, namely solar energy. The United States' best region for solar development is the Mojave Desert, and many large-scale projects are being built or proposed to be built in the area. However, the deployment of solar technology in the Mojave Desert comes with significant ecological, socioeconomic, and political impacts. This paper is intended to provide an overview of the issues surrounding solar development in the Mojave Desert.
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Vazquez, Tyara Kiileialohalani. "Physiological Responses to Heat-stress in a Desert Montane Lizard." University of Toledo / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1544789284098965.

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Sternberg, Troy. "Nomadic geography : pastoral environments in the Gobi Desert, Mongolia." Thesis, University of Oxford, 2009. http://ora.ox.ac.uk/objects/uuid:bc3b363d-5d7a-4b4c-896d-4296ba99cf43.

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Pastoralism on the Mongolian steppe encompasses limited physical resources and evolving anthropogenic influences. Little-studied, the Inner Asian region encounters changing climates, evolving land use practices, and socio-economic transition that impact the natural and human geography. This thesis investigates how bio-physical factors and herder action determine the pastoral environment in the Gobi Desert, Mongolia. Research, focusing on drought, degradation and the extreme winter conditions that define pastoralism in Mongolia, examines pastoralists' perception of and interaction with their environment. This approach highlights steppe ecological and social processes within the global dryland debate. Fieldwork in Omnogovi and Ovorhangai Province established that drought is endemic in the region. However, drought events were independent of extreme winter conditions and did not exacerbate their impact. Degradation was not found at water points as vegetation cover decreased with distance from water. While remote sensing showed a decline in vegetation cover over time, it did not establish desertification on the steppe. Changing physical, socio-economic, and political conditions since 1990 continue to impact Mongolian pastoralism. Environmental conditions, particularly water resources and pasture quality, were paramount herder concerns. This research showed that pastoralists are economically motivated, differentiate on multiple dimensions, and value communal land stewardship. On the steppe, traditional mobile livestock practices improve livelihoods and remain an effective management approach. However, the future of pastoralism is uncertain as herders settle, the population ages, and children become educated. Thesis results emphasize the interaction of physical and social environments will define pastoralism's role in the Gobi Desert
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Abdu, Salamatu. "Does the availability of shade limit use of water troughs by desert birds?" Master's thesis, University of Cape Town, 2015. http://hdl.handle.net/11427/15461.

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Climate change poses a major threat to living organisms, with maximum temperatures expected to continue to rise over the next few decades. Hot desert environments are particularly at risk because they experience high environmental temperatures, scarce vegetation, low productivity and unpredictable water sources. Endotherms such as birds face the challenge of maintaining a stable body temperature while avoiding dehydration. This study was carried out in the southern Kalahari, in South Africa's Northern Cape, where about 50% of bird species (36 species) depend on free-standing drinking water. Livestock farms within this area provide artificial water points, which benefit birds as well as livestock. This study determined the role of shade and cover in the use of these artificial water points by birds. An experiment was conducted at six waterholes using the Before-After, Control-Impact (BACI) design. After an initial baseline was established, three waterholes were shaded while the other three were left unshaded. Camera traps were used to record the pattern and intensity of water use by bird species at different times of the day and at varying air temperatures. A total of 36 bird species drank at the water holes, but data analysis was confined to the ten most abundant species. Of the ten, six species responded to the presence of shade/cover, with four species reacting positively (Cape Glossy Starling Lamprotornis nitens , Red - headed Finch Amadina erythrocephala , Black - throated Canary Serinus atrogularis , and Laughing Dove Spilopelia senegalensis ), four showing no significant change in drinking patterns, and two showing a decrease in visitor numbers when the site was shaded (Cape Turtle - Dove Streptopelia capicola, Namaqua Dove Oena capensis). This suggests that providing shade at waterholes is not a universal solution to the problem of increasing heat stress experienced by birds coming to drink. Certain species such as the Laughing Doves and Cape Turtle-Doves avoided waterholes during the warmest time of the day while the Namaqua Doves were frequent visitors at this time. However, the Laughing Dove took advantage of the shade provided at midday (warmest temperatures) as their numbers increased. The Red-headed Finch and Black-throated Canary also increased at water holes with temperature irrespective of the time of day. These patterns imply that the provision of shade modifies the behavior of some bird species in response to predation risk or heat stress. These species utilized shade at different times of day and with varying intensities as temperatures rose.
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Kirchhof, Sebastian, Robyn S. Hetem, Hilary M. Lease, Donald B. Miles, Duncan Mitchell, Johannes Müller, Mark-Oliver Rödel, Barry Sinervo, Theo Wassenaar, and Ian W. Murray. "Thermoregulatory behavior and high thermal preference buffer impact of climate change in a Namib Desert lizard." WILEY, 2017. http://hdl.handle.net/10150/626549.

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Knowledge of the thermal ecology of a species can improve model predictions for temperature-induced population collapse, which in light of climate change is increasingly important for species with limited distributions. Here, we use a multi-faceted approach to quantify and integrate the thermal ecology, properties of the thermal habitat, and past and present distribution of the diurnal, xeric-adapted, and active-foraging Namibian lizard Pedioplanis husabensis (Sauria: Lacertidae) to model its local extinction risk under future climate change scenarios. We asked whether climatic conditions in various regions of its range are already so extreme that local extirpations of P. husabensis have already occurred, or whether this micro-endemic species is adapted to these extreme conditions and uses behavior to mitigate the environmental challenges. To address this, we collected thermoregulation and climate data at a micro-scale level and combined it with micro-and macroclimate data across the species' range to model extinction risk. We found that P. husabensis inhabits a thermally harsh environment, but also has high thermal preference. In cooler parts of its range, individuals are capable of leaving thermally favorable conditions-based on the species' thermal preference-unused during the day, probably to maintain low metabolic rates. Furthermore, during the summer, we observed that individuals regulate at body temperatures below the species' high thermal preference to avoid body temperatures approaching the critical thermal maximum. We find that populations of this species are currently persisting even at the hottest localities within the species' geographic distribution. We found no evidence of range shifts since the 1960s despite a documented increase in air temperatures. Nevertheless, P. husabensis only has a small safety margin between the upper limit of its thermal preference and the critical thermal maximum and might undergo range reductions in the near future under even the most moderate climate change scenarios.
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Dodson, Leslie Lynn. "A foggy desert| Equitable information flow for a fogwater system in southwest Morocco." Thesis, University of Colorado at Boulder, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=3621317.

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This dissertation describes the design, implementation and evaluation of a gender-inclusive information system linking rural women in Agni Hiya, Morocco and water project managers from the Association Dar Si-Hmad. This research was motivated by an interest in exploring the linkages between information and communication technologies (ICT), climate change, natural resource management and women's participation in community development in the drought-ridden Aït Baamrane region of southwest Morocco. The research investigates the potential for mobile phones to help address communication constraints that rural Berber women face, including culture, religion, and lack of digital literacy. These issues are relevant to the study and design of a gender-inclusive information system (the "Fog Phone") intended to help manage a fogwater distribution system that will deliver water from the Anti-Atlas Mountains to Berber villages.

The research investigates two similar groups of low-literate, marginalized rural Berber women from the same geographic community who have mobile phones. Technology-focused ethnographic research methods were used to first investigate the social, cultural and technical factors involved in mobile phone use by women employed in an Argan oil Cooperative. Findings from the Argan oil Cooperative study were then applied and expanded in a study of Berber women involved in the operation of the fogwater system. By virtue of their responsibilities as principal water gatherers and water users in the community, Berber women are key stakeholders in the fogwater system. Their continued involvement in water management was extended to the participatory design and development of the prototype Fog Phone.

Cultural conditions restricting communication between unrelated men and women led to an information system design that supported cultural, social, economic and technical constraints. The Fog Phone enabled women to report on the water system using a series of symbols that communicate water system status without violating cultural norms. In addition to an exploration of the relationship between gender and technology, this research explores related themes of climate change and environmental vulnerability as they pertain to women's lives and livelihoods, as well as the ability of rural Berber women to manage the environmental assets on which their livelihoods depend.

The contributions of this research include a prototype information system for the fogwater project; a better understanding of the mobile phone utility gap and its impact on the use of ICT by marginalized women in polyglot and oral-language dependent communities; and advances in the emerging practice of ICTs, Climate Change and Development (ICCD) by providing a case study of the linkages between mobile phones, water resources that are affected by climate change and women in rural communities involved in an environmentally sustainable development project in the Middle East and North Africa—a region that is largely missing from ICCD and overall ICT for Development research.

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Books on the topic "Desert climate"

1

Williams, Jasper. Desert climate. Washington. D.C: National Geographic Society, 2007.

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Yagil, Reuven. The desert camel: Comparative physiological adaptation. Basel: Karger, 1985.

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Chris, Hannan, ed. The climate of Oregon: From rain forest to desert. Corvallis: Oregon State University Press, 1999.

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Nabhan, Gary Paul. Growing food in a hotter, drier land: Lessons from desert farmers on adapting to climate uncertainty. White River Junction, Vt: Chelsea Green Pub., 2013.

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Bagne, Karen Elizabeth. Vulnerability of species to climate change in the Southwest: Threatened, endangered, and at-risk species at the Barry M. Goldwater Range, Arizona. Fort Collins, CO: U.S. Dept. of Agriculture, Forest Service, Rocky Mountain Research Station, 2012.

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Rosenlund, Hans. Design for desert: An architect's approach to passive climatisation in hot and arid regions. Lund, Sweden: Architecture and Development Studies, Lund University, 1995.

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Otterman, J. Enhancement of surface-atmosphere fluxes by desert-fringe vegetation through reduction of surface albedo and of soil heat flux. [Washington, D.C: National Aeronautics and Space Administration, 1988.

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Otterman, J. Enhancement of surface-atmosphere fluxes by desert-fringe vegetation through reduction of surface albedo and of soil heat flux. [Washington, D.C: National Aeronautics and Space Administration, 1988.

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Nurberdiev, Mukhametguly. Produktivnostʹ pastbishch pustynʹ Sredneĭ Azii, ot͡s︡enka i upravlenie. Ashgabat: Ylym, 1992.

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editor, Tyagi Prakash, and Grameen Vikas Vigyan Samiti (Jodhpur, India), eds. Dealing with a different desert: Vulnerability and adaptation to climate change in the Thar. Jodhpur: GRAVIS, 2014.

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Book chapters on the topic "Desert climate"

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Ottmann, Daniela A. "Desert Climate Design." In Ecological Building Materials for Deserts and Drylands, 21–27. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-95456-7_4.

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Ottmann, Daniela A. "Desert Climate Culture." In Ecological Building Materials for Deserts and Drylands, 13–19. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-95456-7_3.

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Tyagi, B. K. "Malaria and Climate Change." In Desert Malaria, 307–21. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-7693-3_19.

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di Sarra, A., M. Cacciani, J. DeLuisi, L. De Silvestri, T. Di Iorio, G. Fiocco, and P. Grigioni. "Desert Aerosol in the Mediterranean." In Mediterranean Climate, 309–15. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-642-55657-9_19.

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Adams, Jonathan. "The desert makes the desert: Climate feedbacks from the vegetation of arid zones." In Vegetation—Climate Interaction, 121–51. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-00881-8_5.

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Etzion, Yair, David Pearlmutter, Evyatar Erell, and Isaac A. Meir. "Adaptive Architecture: Low-Energy Technologies for Climate Control in the Desert." In Desert Regions, 291–304. Berlin, Heidelberg: Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/978-3-642-60171-2_17.

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Shehzadi, Nirma, Filza Ishfaq, Athar Mahmood, Muhammad Mansoor Javaid, Maria Naqve, Abdul Jabbar, and Ahsan Aziz. "Crop Improvement in the Desert." In Climate-Resilient Agriculture, Vol 1, 465–85. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-37424-1_21.

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Goudie, Andrew. "Climate Change." In Desert Landscapes of the World with Google Earth, 201–22. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-15179-8_7.

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Tyagi, B. K. "Anopheles stephensi: The First Vector to Show an Evolutionary Response to Rapid Climate Change." In Desert Malaria, 323–32. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-7693-3_20.

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Sindhu, Abdul Shakoor. "4. Desert and floodplain adaptation in Pakistan." In Understanding Climate Change Adaptation, 71–86. Rugby, Warwickshire, United Kingdom: Practical Action Publishing, 2009. http://dx.doi.org/10.3362/9781780440415.004.

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Conference papers on the topic "Desert climate"

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Marincic, I., J. M. Ochoa, and M. G. Alpuche. "Passive house for a desert climate." In ECO-ARCHITECTURE 2014. Southampton, UK: WIT Press, 2014. http://dx.doi.org/10.2495/arc140021.

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Meena, Hansa. "Climate Change: Biodiversity Conservation with Reference to Thar Desert." In International Conference on Climate Change. The International Institute of Knowledge Management (TIIKM), 2017. http://dx.doi.org/10.17501/iccc.2017.1101.

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Alanezi, Abdullah, and Mohammad H. Naraghi. "Solar Photovoltaic Power Plant Development for a Desert Climate." In ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-86588.

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The present work develops design guidelines for a photovoltaic power plant to shave peak electricity demand in an arid climate, which cover approximately 1/3rd of earth land mass and a good portion of this climate is in the Middle East and North Africa. In a typical desert climate, such as the Arabian Peninsula a large portion of the electricity consumed is due to the use of air conditioning units during hot sunny days. In the present work the energy consumption pattern of a typical building in an arid area is studied. Additionally, overall regional grid power demand in Tabuk located in Northwest of Saudi Arabia is studied. Guidelines for development of solar plants (i.e., panel ordinations) are presented to shave off the peak demand. It is determined that for most desert climates the peak electricity demand is between 2:00–5:00PM during summers.
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Aviv, Dorit, Zherui Wang, Forrest Meggers, and Aletheia Ida. "Surface Generation of Radiatively-Cooled Building Skin for Desert Climate." In ACADIA 2020: Distributed Proximities. ACADIA, 2020. http://dx.doi.org/10.52842/conf.acadia.2020.1.066.

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Springer, Kathleen B., Jeffrey S. Pigati, Jeffrey S. Pigati, Craig R. Manker, Craig R. Manker, Shannon A. Mahan, and Shannon A. Mahan. "THE REGIONAL RESPONSE OF DESERT WETLANDS TO ABRUPT CLIMATE CHANGE IN THE MOJAVE DESERT AND SOUTHERN GREAT BASIN." In 112th Annual GSA Cordilleran Section Meeting. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016cd-274576.

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He, Qing, Hongjun Li, Xinjian Li, Qing Yang, Xiaoling Pan, and Wei Gao. "Preliminary analysis on boundary climate effects between oasis and desert in the north margin of the Taklimakan Desert." In Optical Science and Technology, the SPIE 49th Annual Meeting, edited by Wei Gao and David R. Shaw. SPIE, 2004. http://dx.doi.org/10.1117/12.559440.

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Brunelle, Andrea, and Thomas Minckley. "LONG-TERM CLIMATE CONTROLS ON WETLAND ECOSYSTEMS IN THE DESERT SOUTHWEST." In Joint 70th Annual Rocky Mountain GSA Section / 114th Annual Cordilleran GSA Section Meeting - 2018. Geological Society of America, 2018. http://dx.doi.org/10.1130/abs/2018rm-314371.

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Hendaus, Mohamed A., Ahmed Alhammadi, Mohamed Khalifa, and Prem Chandra. "Seasonal Variation in Respiratory Syncytial Virus Infection in a Desert Climate." In Selection of Abstracts From NCE 2016. American Academy of Pediatrics, 2018. http://dx.doi.org/10.1542/peds.141.1_meetingabstract.436.

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A´lvarez, G., M. A. Chagolla, J. P. Xama´n, M. J. Jime´nez, S. Sua´rez, and M. R. Heras. "A TRNSYS Simulation and Experimental Comparison of the Thermal Behavior of a Building Located in Desert Climate." In ASME 2010 4th International Conference on Energy Sustainability. ASMEDC, 2010. http://dx.doi.org/10.1115/es2010-90272.

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This paper describes a TRNSYS simulation of a space of an office building in dessert climate. The space simulated by TRNSYS represents a meeting room which is placed in one of the high mass buildings of the Plataforma Solar of Almeria located in the desert of Tabernas, Spain. The meeting room was selected because hygrothermal variables are being measured. The simulation results are compared with experimental data of the meeting room. The main goal is to describe the thermal behavior of the meeting room of this high mass building in free evolution and verify its thermal performance with the measured data. Climate input variables to the simulation were solar radiation, dry bulb temperature, relative humidity and wind velocity recorded by a meteorological station installed on top of the building. As a first approach coolest winter day and hottest summer day were analyzed. The comparison results between the TRNSYS simulation results and measured ones show a maximum percentage difference of 4.51% (0.60 °C).
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Springer, Kathleen B., Jeffrey S. Pigati, Shannon A. Mahan, Jordon Bright, and Scott W. Starratt. "THE HYDROLOGIC RESPONSE OF DESERT WETLANDS TO ABRUPT CLIMATE CHANGE IN THE SOUTHERN GREAT BASIN AND MOJAVE DESERTS." In GSA Annual Meeting in Denver, Colorado, USA - 2016. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016am-281445.

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Reports on the topic "Desert climate"

1

Wigand, P. E. [Climate implications of terrestrial paleoclimate]. Quaternary Sciences Center, Desert Research Institute annual report, fiscal year 1994/1995. Office of Scientific and Technical Information (OSTI), December 1995. http://dx.doi.org/10.2172/631155.

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Raymond, Kara, Laura Palacios, Cheryl McIntyre, and Evan Gwilliam. Status of climate and water resources at Saguaro National Park: Water year 2019. Edited by Alice Wondrak Biel. National Park Service, December 2021. http://dx.doi.org/10.36967/nrr-2288717.

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Climate and hydrology are major drivers of ecosystems. They dramatically shape ecosystem structure and function, particularly in arid and semi-arid ecosystems. Understanding changes in climate, groundwater, and water quality and quantity is central to assessing the condition of park biota and key cultural resources. The Sonoran Desert Network collects data on climate, groundwater, and surface water at 11 National Park Service units in south-ern Arizona and New Mexico. This report provides an integrated look at climate, groundwater, and springs conditions at Saguaro National Park (NP) during water year 2019 (October 2018–September 2019). Annual rainfall in the Rincon Mountain District was 27.36" (69.49 cm) at the Mica Mountain RAWS station and 12.89" (32.74 cm) at the Desert Research Learning Center Davis station. February was the wettest month, accounting for nearly one-quarter of the annual rainfall at both stations. Each station recorded extreme precipitation events (>1") on three days. Mean monthly maximum and minimum air temperatures were 25.6°F (-3.6°C) and 78.1°F (25.6°C), respectively, at the Mica Mountain station, and 37.7°F (3.2°C) and 102.3°F (39.1°C), respectively, at the Desert Research Learning Center station. Overall temperatures in WY2019 were cooler than the mean for the entire record. The reconnaissance drought index for the Mica Mountain station indicated wetter conditions than average in WY2019. Both of the park’s NOAA COOP stations (one in each district) had large data gaps, partially due to the 35-day federal government shutdown in December and January. For this reason, climate conditions for the Tucson Mountain District are not reported. The mean groundwater level at well WSW-1 in WY2019 was higher than the mean for WY2018. The water level has generally been increasing since 2005, reflecting the continued aquifer recovery since the Central Avra Valley Storage and Recovery Project came online, recharging Central Arizona Project water. Water levels at the Red Hills well generally de-clined starting in fall WY2019, continuing through spring. Monsoon storms led to rapid water level increases. Peak water level occurred on September 18. The Madrona Pack Base well water level in WY2019 remained above 10 feet (3.05 m) below measuring point (bmp) in the fall and winter, followed by a steep decline starting in May and continuing until the end of September, when the water level rebounded following a three-day rain event. The high-est water level was recorded on February 15. Median water levels in the wells in the middle reach of Rincon Creek in WY2019 were higher than the medians for WY2018 (+0.18–0.68 ft/0.05–0.21 m), but still generally lower than 6.6 feet (2 m) bgs, the mean depth-to-water required to sustain juvenile cottonwood and willow trees. RC-7 was dry in June–September, and RC-4 was dry in only September. RC-5, RC-6 and Well 633106 did not go dry, and varied approximately 3–4 feet (1 m). Eleven springs were monitored in the Rincon Mountain District in WY2019. Most springs had relatively few indications of anthropogenic or natural disturbance. Anthropogenic disturbance included spring boxes or other modifications to flow. Examples of natural disturbance included game trails and scat. In addition, several sites exhibited slight disturbance from fires (e.g., burned woody debris and adjacent fire-scarred trees) and evidence of high-flow events. Crews observed 1–7 taxa of facultative/obligate wetland plants and 0–3 invasive non-native species at each spring. Across the springs, crews observed four non-native plant species: rose natal grass (Melinis repens), Kentucky bluegrass (Poa pratensis), crimson fountaingrass (Cenchrus setaceus), and red brome (Bromus rubens). Baseline data on water quality and chemistry were collected at all springs. It is likely that that all springs had surface water for at least some part of WY2019. However, temperature sensors to estimate surface water persistence failed...
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Lawrence, David, Mike Tercek, Amber Runyon, and Jeneva Wright. Historical and projected climate change for Grand Canyon National Park and surrounding areas. National Park Service, 2024. http://dx.doi.org/10.36967/2301726.

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Globally, anthropogenic climate change is one of the greatest threats to resources in protected areas. This report examines historical and projected climate change across the Greater Grand Canyon Landscape (GGCL), including Grand Canyon National Park. Grand Canyon National Park warmed significantly from 1895-2020 (annual mean increase of 1.89? F/century), with temperatures increasing at a faster rate from 1970-2020 (6.31? F/century). Warming occurred at all elevations and seasons across the GGCL, but rates differed spatially. Average annual total precipitation within Grand Canyon National Park did not change significantly over either period examined (1895-2020; 1970-2020). A variety of changes in the region of Grand Canyon National Park have been detected and attributed, at least in part, to anthropogenic climate change, including reduced soil moisture (and associated drought), reduced Colorado River flow, doubling of the area burned by wildfire across the western United States, reduced regeneration of low-elevation ponderosa pine and Douglas-fir as well as pinyon pine and juniper populations, northward shifts in many bird species distributions and declines of bird species occupancy in the Mojave Desert, and reduced bumble bee species richness and abundance (key pollinators). To help managers understand and plan around a range of plausible future climates, we present two plausible but contrasting climate futures for the Greater Grand Canyon Landscape, characterized at mid-century (2040-2069) and late-century (2070-2099). Examining multiple plausible futures avoids over-optimizing management strategies for a single projected future that may not occur. Overarching patterns that emerged from both climate futures include additional warming (average, as well as extreme temperatures), seasonal increases in extreme precipitation events, fewer freezing days and days with snow, and higher moisture deficit (a correlate with landscape dryness, conditions conducive to fire, and vegetation stress). The selected climate futures differed in terms of 1) the degree of warming, 2) whether winter precipitation increases or decreases, 3) whether annual precipitation increases or stays similar, 4) whether drought conditions increase or decrease, and 5) whether runoff increases or decreases. Runoff is projected to occur earlier under both climate futures and is projected to exhibit a more episodic pattern. Based on a literature review, projected changes to the physical, ecological, and cultural resource domains of the region resulting from anthropogenic climate change include: ? Increasing drought risk and aridification ? Reduced Colorado River flow ? Reduced groundwater infiltration ? Decreasing runoff (from snow or rain) in the spring, summer, and fall, and increasing runoff in the winter ? Increasing occurrence of large fires ? Increasing invasive grasses in the Mojave Desert ecosystems west of the park, providing more fuel for wildfire ? Exacerbated post-fire erosion and sediment in Grand Canyon watersheds ? Increased episodes of drought-induced tree mortality ? Upslope shifts of the elevational zones of pinyon-juniper woodland, ponderosa pine forest, and spruce-fir forest, as well as increases in non-forest areas and aboveground biomass declines ? Reduced abundance of riparian vegetation that tolerates water inundation ? Increasing invasive plant distribution and abundance, favoring their establishment and productivity ? Colonization of the GGCL by some bird species and extirpation of others ? Increasing non-native fish populations relative to native fishes ? Declining butterfly populations ? Increasing temperatures will increase visitation, especially during winter and shoulder seasons ? Exacerbation of existing threats to archeological resources, cultural landscapes, and historic structures, as well as emergent vulnerabilities related to climate change One goal of this work is to support the Resource Stewardship Strategy (RSS) process that Grand Canyon National Park plans to undertake. We anticipate that connecting the climate changes described here to the climate sensitivities of resources within the park will play a critical role in setting goals and strategies during development of the RSS, as well as proactively adapting to anticipated changes.
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Beccali, Marco, Marina Bonomolo, Francesca Martorana, Ben Alex Baby, Marco Pellegrini, and Salvatore Vasta. Show Cases on System and Component Level & Adapted Components. IEA SHC Task 65, April 2024. http://dx.doi.org/10.18777/ieashc-task65-2024-0001.

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This document is the final report for joint activities A2, “Adapted components”, and B1, “Show cases on system and component level” of the IEA SHC Task 65, “Solar Cooling for the Sunbelt Regions. The first part of the report presents results from 32 investigated projects across 18 countries representing a range of 10 weather profiles such as the tropical wet and dry (Aw), hot desert (BWh), hot semi-arid (BSh), hot summer-Mediterranean (Csa), warmsummer Mediterranean (Csb), humid subtropic (Cfa), monsoon-influenced humid subtropical (Cwa), hot summer humid continental climate zones.
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Henderson, Tim, Mincent Santucci, Tim Connors, and Justin Tweet. National Park Service geologic type section inventory: Chihuahuan Desert Inventory & Monitoring Network. National Park Service, April 2021. http://dx.doi.org/10.36967/nrr-2285306.

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A fundamental responsibility of the National Park Service is to ensure that park resources are preserved, protected, and managed in consideration of the resources themselves and for the benefit and enjoyment by the public. Through the inventory, monitoring, and study of park resources, we gain a greater understanding of the scope, significance, distribution, and management issues associated with these resources and their use. This baseline of natural resource information is available to inform park managers, scientists, stakeholders, and the public about the conditions of these resources and the factors or activities which may threaten or influence their stability. There are several different categories of geologic or stratigraphic units (supergroup, group, formation, member, bed) which represent a hierarchical system of classification. The mapping of stratigraphic units involves the evaluation of lithologies, bedding properties, thickness, geographic distribution, and other factors. If a new mappable geologic unit is identified, it may be described and named through a rigorously defined process that is standardized and codified by the professional geologic community (North American Commission on Stratigraphic Nomenclature 2005). In most instances when a new geologic unit such as a formation is described and named in the scientific literature, a specific and well-exposed section of the unit is designated as the type section or type locality (see Definitions). The type section is an important reference section for a named geologic unit which presents a relatively complete and representative profile for this unit. The type or reference section is important both historically and scientifically, and should be recorded such that other researchers may evaluate it in the future. Therefore, this inventory of geologic type sections in NPS areas is an important effort in documenting these locations in order that NPS staff recognize and protect these areas for future studies. The documentation of all geologic type sections throughout the 423 units of the NPS is an ambitious undertaking. The strategy for this project is to select a subset of parks to begin research for the occurrence of geologic type sections within particular parks. The focus adopted for completing the baseline inventories throughout the NPS was centered on the 32 inventory and monitoring networks (I&M) established during the late 1990s. The I&M networks are clusters of parks within a defined geographic area based on the ecoregions of North America (Fenneman 1946; Bailey 1976; Omernik 1987). These networks share similar physical resources (geology, hydrology, climate), biological resources (flora, fauna), and ecological characteristics. Specialists familiar with the resources and ecological parameters of the network, and associated parks, work with park staff to support network level activities (inventory, monitoring, research, data management). Adopting a network-based approach to inventories worked well when the NPS undertook paleontological resource inventories for the 32 I&M networks. The network approach is also being applied to the inventory for the geologic type sections in the NPS. The planning team from the NPS Geologic Resources Division who proposed and designed this inventory selected the Greater Yellowstone Inventory and Monitoring Network (GRYN) as the pilot network for initiating this project. Through the research undertaken to identify the geologic type sections within the parks of the GRYN, methodologies for data mining and reporting on these resources was established. Methodologies and reporting adopted for the GRYN have been used in the development of this type section inventory for the Chihuahuan Desert Inventory & Monitoring Network. The goal of this project is to consolidate information pertaining to geologic type sections which occur within NPS-administered areas, in order that this information is available throughout the NPS...
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Henderson, Tim, Vincent Santucci, Tim Connors, and Justin Tweet. National Park Service geologic type section inventory: Mojave Desert Inventory & Monitoring Network. National Park Service, December 2021. http://dx.doi.org/10.36967/nrr-2289952.

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A fundamental responsibility of the National Park Service (NPS) is to ensure that park resources are preserved, protected, and managed in consideration of the resources themselves and for the benefit and enjoyment by the public. Through the inventory, monitoring, and study of park resources, we gain a greater understanding of the scope, significance, distribution, and management issues associated with these resources and their use. This baseline of natural resource information is available to inform park managers, scientists, stakeholders, and the public about the conditions of these resources and the factors or activities that may threaten or influence their stability and preservation. There are several different categories of geologic or stratigraphic units (supergroup, group, formation, member, bed) that represent a hierarchical system of classification. The mapping of stratigraphic units involves the evaluation of lithologies, bedding properties, thickness, geographic distribution, and other factors. Mappable geologic units may be described and named through a rigorously defined process that is standardized and codified by the professional geologic community (North American Commission on Stratigraphic Nomenclature 2005). In most instances when a new geologic unit such as a formation is described and named in the scientific literature, a specific and well-exposed section or exposure area of the unit is designated as the type section or other category of stratotype (see “Definitions” below). The type section is an important reference exposure for a named geologic unit which presents a relatively complete and representative example for this unit. Geologic stratotypes are important both historically and scientifically, and should be available for other researchers to evaluate in the future.. The inventory of all geologic stratotypes throughout the 423 units of the NPS is an important effort in documenting these locations in order that NPS staff recognize and protect these areas for future studies. The focus adopted for completing the baseline inventories throughout the NPS was centered on the 32 inventory and monitoring networks (I&M) established during the late 1990s. The I&M networks are clusters of parks within a defined geographic area based on the ecoregions of North America (Fenneman 1946; Bailey 1976; Omernik 1987). These networks share similar physical resources (e.g., geology, hydrology, climate), biological resources (e.g., flora, fauna), and ecological characteristics. Specialists familiar with the resources and ecological parameters of the network, and associated parks, work with park staff to support network-level activities such as inventory, monitoring, research, and data management. Adopting a network-based approach to inventories worked well when the NPS undertook paleontological resource inventories for the 32 I&M networks. The planning team from the NPS Geologic Resources Division who proposed and designed this inventory selected the Greater Yellowstone Inventory & Monitoring Network (GRYN) as the pilot network for initiating this project. Through the research undertaken to identify the geologic stratotypes within the parks of the GRYN methodologies for data mining and reporting on these resources were established. Methodologies and reporting adopted for the GRYN have been used in the development of this report for the Mojave Desert Inventory & Monitoring Network (MOJN). The goal of this project is to consolidate information pertaining to geologic type sections that occur within NPS-administered areas, in order that this information is available throughout the NPS to inform park managers and to promote the preservation and protection of these important geologic landmarks and geologic heritage resources. The review of stratotype occurrences for the MOJN shows there are currently no designated stratotypes for Joshua Tree National Park (JOTR) or Manzanar National Historic Site (MANZ); Death Valley...
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Freeman, Stanley, Russell Rodriguez, Adel Al-Abed, Roni Cohen, David Ezra, and Regina Redman. Use of fungal endophytes to increase cucurbit plant performance by conferring abiotic and biotic stress tolerance. United States Department of Agriculture, January 2014. http://dx.doi.org/10.32747/2014.7613893.bard.

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Major threats to agricultural sustainability in the 21st century are drought, increasing temperatures, soil salinity and soilborne pathogens, all of which are being exacerbated by climate change and pesticide abolition and are burning issues related to agriculture in the Middle East. We have found that Class 2 fungal endophytes adapt native plants to environmental stresses (drought, heat and salt) in a habitat-specific manner, and that these endophytes can confer stress tolerance to genetically distant monocot and eudicot hosts. In the past, we generated a uv non-pathogenic endophytic mutant of Colletotrichum magna (path-1) that colonized cucurbits, induced drought tolerance and enhanced growth, and protected 85% - 100% against disease caused by certain pathogenic fungi. We propose: 1) utilizing path-1 and additional endophtyic microorganisms to be isolated from stress-tolerant local, wild cucurbit watermelon, Citrulluscolocynthis, growing in the Dead Sea and Arava desert areas, 2) generate abiotic and biotic tolerant melon crop plants, colonized by the isolated endophytes, to increase crop yields under extreme environmental conditions such as salinity, heat and drought stress, 3) manage soilborne fungal pathogens affecting curubit crop species growing in the desert areas. This is a unique and novel "systems" approach that has the potential to utilize natural plant adaptation for agricultural development. We envisage that endophyte-colonized melons will eventually be used to overcome damages caused by soilborne diseases and also for cultivation of this crop, under stress conditions, utilizing treated waste water, thus dealing with the limited resource of fresh water.
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Arhin, Albert, and Felix Kalaba. Tackling Climate Crisis: Exploring the Implications of the Proposed G7 Climate Club on Climate and Development Agendas of African Countries. APRI - Africa Policy Research Private Institute gUG (haftungsbeschränkt)., July 2023. http://dx.doi.org/10.59184/pb023.04.

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This article highlights the implications and plausible effects related to establishing the G7 Climate Club for African countries. It argues that, while the Climate Club initiative may hold some promise for addressing the climate crisis, its potential implications for African countries deserve careful consideration.
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9

Raymond, Kara, Laura Palacios, Cheryl McIntyre, and Evan Gwilliam. Status of climate and water resources at Chiricahua National Monument, Coronado National Memorial, and Fort Bowie National Historic Site: Water year 2019. National Park Service, May 2022. http://dx.doi.org/10.36967/nrr-2293370.

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Climate and hydrology are major drivers of ecosystems. They dramatically shape ecosystem structure and function, particularly in arid and semi-arid ecosystems. Understanding changes in climate, groundwater, and water quality and quantity is central to assessing the condition of park biota and key cultural resources. The Sonoran Desert Network collects data on climate, groundwater, and surface water at 11 National Park Service units in southern Arizona and New Mexico. This report provides an integrated look at climate, groundwater, and springs conditions at Chiricahua National Monument (NM), Coronado National Memorial (NMem), and Fort Bowie National Historic Site (NHS) during water year (WY) 2019 (October 2018–September 2019). Overall annual precipitation at Chiricahua NM and Coronado NMem in WY2019 was approximately the same as the normals for 1981–2010. (The weather station at Fort Bowie NHS had missing values on 275 days, so data were not presented for that park.) Fall and winter rains were greater than normal. The monsoon season was generally weaker than normal, but storm events related to Hurricane Lorena led to increased late-season rain in September. Mean monthly maximum temperatures were generally cooler than normal at Chiricahua, whereas mean monthly minimum temperatures were warmer than normal. Temperatures at Coronado were more variable relative to normal. The reconnaissance drought index (RDI) indicated that Chiricahua NM was slightly wetter than normal. (The WY2019 RDI could not be calculated for Coronado NMem due to missing data.) The five-year moving mean of annual precipitation showed both park units were experiencing a minor multi-year precipitation deficit relative to the 39-year average. Mean groundwater levels in WY2019 increased at Fort Bowie NHS, and at two of three wells monitored at Chiricahua NM, compared to WY2018. Levels in the third well at Chiricahua slightly decreased. By contrast, water levels declined in five of six wells at Coronado NMem over the same period, with the sixth well showing a slight increase over WY2018. Over the monitoring record (2007–present), groundwater levels at Chiricahua have been fairly stable, with seasonal variability likely caused by transpiration losses and recharge from runoff events in Bonita Creek. At Fort Bowie’s WSW-2, mean groundwater level was also relatively stable from 2004 to 2019, excluding temporary drops due to routine pumping. At Coronado, four of the six wells demonstrated increases (+0.30 to 11.65 ft) in water level compared to the earliest available measurements. Only WSW-2 and Baumkirchner #3 have shown net declines (-17.31 and -3.80 feet, respectively) at that park. Springs were monitored at nine sites in WY2019 (four sites at Chiricahua NM; three at Coronado NMem, and two at Fort Bowie NHS). Most springs had relatively few indications of anthropogenic or natural disturbance. Anthropogenic disturbance included modifications to flow, such as dams, berms, or spring boxes. Examples of natural disturbance included game trails, scat, or evidence of flooding. Crews observed 0–6 facultative/obligate wetland plant taxa and 0–3 invasive non-native species at each spring. Across the springs, crews observed six non-native plant species: common mullein (Verbascum thapsus), spiny sowthistle (Sonchus asper), common sowthistle (Sonchus oleraceus), Lehmann lovegrass (Eragrostis lehmanniana), rabbitsfoot grass (Polypogon monspeliensis), and red brome (Bromus rubens). Baseline data on water quality and water chemistry were collected at all nine sites. It is likely that that all nine springs had surface water for at least some part of WY2019, though temperature sensors failed at two sites. The seven sites with continuous sensor data had water present for most of the year. Discharge was measured at eight sites and ranged from < 1 L/minute to 16.5 L/minute.
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Finch, Deborah M. Climate change in grasslands, shrublands, and deserts of the interior American West: a review and needs assessment. Ft. Collins, CO: U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, 2012. http://dx.doi.org/10.2737/rmrs-gtr-285.

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