Relevant bibliographies by topics / FLUXNET

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Academic literature on the topic 'FLUXNET'

Author: Grafiati
Published: 4 June 2021
Last updated: 11 March 2023

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Journal articles on the topic "FLUXNET"

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Haughton, Ned, Gab Abramowitz, Martin G. De Kauwe, and Andy J. Pitman. "Does predictability of fluxes vary between FLUXNET sites?" Biogeosciences 15, no. 14 (July 25, 2018): 4495–513. http://dx.doi.org/10.5194/bg-15-4495-2018.

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Abstract. The FLUXNET dataset contains eddy covariance measurements from across the globe and represents an invaluable estimate of the fluxes of energy, water, and carbon between the land surface and the atmosphere. While there is an expectation that the broad range of site characteristics in FLUXNET result in a diversity of flux behaviour, there has been little exploration of how predictable site behaviour is across the network. Here, 155 datasets with 30 min temporal resolution from the Tier 1 of FLUXNET 2015 were analysed in a first attempt to assess individual site predictability. We defined site uniqueness as the disparity in performance between multiple empirical models trained globally and locally for each site and used this along with the mean performance as measures of predictability. We then tested how strongly uniqueness was determined by various site characteristics, including climatology, vegetation type, and data quality. The strongest determinant of predictability appeared to be that drier sites tended to be more unique. We found very few other clear predictors of uniqueness across different sites, in particular little evidence that flux behaviour was well discretised by vegetation type. Data length and quality also appeared to have little impact on uniqueness. While this result might relate to our definition of uniqueness, we argue that our approach provides a useful basis for site selection in LSM evaluation, and we invite critique and development of the methodology.
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Zhang, Xiangxiang, Yongjiu Dai, Hongzhi Cui, Robert E. Dickinson, Siguang Zhu, Nan Wei, Binyan Yan, et al. "Evaluating common land model energy fluxes using FLUXNET data." Advances in Atmospheric Sciences 34, no. 9 (August 4, 2017): 1035–46. http://dx.doi.org/10.1007/s00376-017-6251-y.

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Blyth, Eleanor, John Gash, Amanda Lloyd, Matthew Pryor, Graham P. Weedon, and Jim Shuttleworth. "Evaluating the JULES Land Surface Model Energy Fluxes Using FLUXNET Data." Journal of Hydrometeorology 11, no. 2 (April 1, 2010): 509–19. http://dx.doi.org/10.1175/2009jhm1183.1.

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Abstract Surface energy flux measurements from a sample of 10 flux network (FLUXNET) sites selected to represent a range of climate conditions and biome types were used to assess the performance of the Hadley Centre land surface model (Joint U.K. Land Environment Simulator; JULES). Because FLUXNET data are prone systematically to undermeasure surface fluxes, the model was evaluated by its ability to partition incoming radiant energy into evaporation and how such partition varies with atmospheric evaporative demand at annual, seasonal, weekly, and diurnal time scales. The model parameters from the GCM configuration were used. The overall performance was good, although weaknesses in model performance were identified that are associated with the specification of the leaf area index and plant rooting depth, and the representation of soil freezing.
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Delwiche, Kyle B., Sara Helen Knox, Avni Malhotra, Etienne Fluet-Chouinard, Gavin McNicol, Sarah Feron, Zutao Ouyang, et al. "FLUXNET-CH<sub>4</sub>: a global, multi-ecosystem dataset and analysis of methane seasonality from freshwater wetlands." Earth System Science Data 13, no. 7 (July 29, 2021): 3607–89. http://dx.doi.org/10.5194/essd-13-3607-2021.

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Abstract. Methane (CH4) emissions from natural landscapes constitute roughly half of global CH4 contributions to the atmosphere, yet large uncertainties remain in the absolute magnitude and the seasonality of emission quantities and drivers. Eddy covariance (EC) measurements of CH4 flux are ideal for constraining ecosystem-scale CH4 emissions due to quasi-continuous and high-temporal-resolution CH4 flux measurements, coincident carbon dioxide, water, and energy flux measurements, lack of ecosystem disturbance, and increased availability of datasets over the last decade. Here, we (1) describe the newly published dataset, FLUXNET-CH4 Version 1.0, the first open-source global dataset of CH4 EC measurements (available at https://fluxnet.org/data/fluxnet-ch4-community-product/, last access: 7 April 2021). FLUXNET-CH4 includes half-hourly and daily gap-filled and non-gap-filled aggregated CH4 fluxes and meteorological data from 79 sites globally: 42 freshwater wetlands, 6 brackish and saline wetlands, 7 formerly drained ecosystems, 7 rice paddy sites, 2 lakes, and 15 uplands. Then, we (2) evaluate FLUXNET-CH4 representativeness for freshwater wetland coverage globally because the majority of sites in FLUXNET-CH4 Version 1.0 are freshwater wetlands which are a substantial source of total atmospheric CH4 emissions; and (3) we provide the first global estimates of the seasonal variability and seasonality predictors of freshwater wetland CH4 fluxes. Our representativeness analysis suggests that the freshwater wetland sites in the dataset cover global wetland bioclimatic attributes (encompassing energy, moisture, and vegetation-related parameters) in arctic, boreal, and temperate regions but only sparsely cover humid tropical regions. Seasonality metrics of wetland CH4 emissions vary considerably across latitudinal bands. In freshwater wetlands (except those between 20∘ S to 20∘ N) the spring onset of elevated CH4 emissions starts 3 d earlier, and the CH4 emission season lasts 4 d longer, for each degree Celsius increase in mean annual air temperature. On average, the spring onset of increasing CH4 emissions lags behind soil warming by 1 month, with very few sites experiencing increased CH4 emissions prior to the onset of soil warming. In contrast, roughly half of these sites experience the spring onset of rising CH4 emissions prior to the spring increase in gross primary productivity (GPP). The timing of peak summer CH4 emissions does not correlate with the timing for either peak summer temperature or peak GPP. Our results provide seasonality parameters for CH4 modeling and highlight seasonality metrics that cannot be predicted by temperature or GPP (i.e., seasonality of CH4 peak). FLUXNET-CH4 is a powerful new resource for diagnosing and understanding the role of terrestrial ecosystems and climate drivers in the global CH4 cycle, and future additions of sites in tropical ecosystems and site years of data collection will provide added value to this database. All seasonality parameters are available at https://doi.org/10.5281/zenodo.4672601 (Delwiche et al., 2021). Additionally, raw FLUXNET-CH4 data used to extract seasonality parameters can be downloaded from https://fluxnet.org/data/fluxnet-ch4-community-product/ (last access: 7 April 2021), and a complete list of the 79 individual site data DOIs is provided in Table 2 of this paper.
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van der Horst, Sophie V. J., Andrew J. Pitman, Martin G. De Kauwe, Anna Ukkola, Gab Abramowitz, and Peter Isaac. "How representative are FLUXNET measurements of surface fluxes during temperature extremes?" Biogeosciences 16, no. 8 (April 30, 2019): 1829–44. http://dx.doi.org/10.5194/bg-16-1829-2019.

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Abstract. In response to a warming climate, temperature extremes are changing in many regions of the world. Therefore, understanding how the fluxes of sensible heat, latent heat and net ecosystem exchange respond and contribute to these changes is important. We examined 216 sites from the open access Tier 1 FLUXNET2015 and free fair-use La Thuile data sets, focussing only on observed (non-gap-filled) data periods. We examined the availability of sensible heat, latent heat and net ecosystem exchange observations coincident in time with measured temperature for all temperatures, and separately for the upper and lower tail of the temperature distribution, and expressed this availability as a measurement ratio. We showed that the measurement ratios for both sensible and latent heat fluxes are generally lower (0.79 and 0.73 respectively) than for temperature measurements, and the measurement ratio of net ecosystem exchange measurements are appreciably lower (0.42). However, sites do exist with a high proportion of measured sensible and latent heat fluxes, mostly over the United States, Europe and Australia. Few sites have a high proportion of measured fluxes at the lower tail of the temperature distribution over very cold regions (e.g. Alaska, Russia) or at the upper tail in many warm regions (e.g. Central America and the majority of the Mediterranean region), and many of the world's coldest and hottest regions are not represented in the freely available FLUXNET data at all (e.g. India, the Gulf States, Greenland and Antarctica). However, some sites do provide measured fluxes at extreme temperatures, suggesting an opportunity for the FLUXNET community to share strategies to increase measurement availability at the tails of the temperature distribution. We also highlight a wide discrepancy between the measurement ratios across FLUXNET sites that is not related to the actual temperature or rainfall regimes at the site, which we cannot explain. Our analysis provides guidance to help select eddy covariance sites for researchers interested in understanding and/or modelling responses to temperature extremes.
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Slevin, Darren, Simon F. B. Tett, Jean-François Exbrayat, A. Anthony Bloom, and Mathew Williams. "Global evaluation of gross primary productivity in the JULES land surface model v3.4.1." Geoscientific Model Development 10, no. 7 (July 11, 2017): 2651–70. http://dx.doi.org/10.5194/gmd-10-2651-2017.

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Abstract. This study evaluates the ability of the JULES land surface model (LSM) to simulate gross primary productivity (GPP) on regional and global scales for 2001–2010. Model simulations, performed at various spatial resolutions and driven with a variety of meteorological datasets (WFDEI-GPCC, WFDEI-CRU and PRINCETON), were compared to the MODIS GPP product, spatially gridded estimates of upscaled GPP from the FLUXNET network (FLUXNET-MTE) and the CARDAMOM terrestrial carbon cycle analysis. Firstly, when JULES was driven with the WFDEI-GPCC dataset (at 0. 5° × 0. 5° spatial resolution), the annual average global GPP simulated by JULES for 2001–2010 was higher than the observation-based estimates (MODIS and FLUXNET-MTE), by 25 and 8 %, respectively, and CARDAMOM estimates by 23 %. JULES was able to simulate the standard deviation of monthly GPP fluxes compared to CARDAMOM and the observation-based estimates on global scales. Secondly, GPP simulated by JULES for various biomes (forests, grasslands and shrubs) on global and regional scales were compared. Differences among JULES, MODIS, FLUXNET-MTE and CARDAMOM on global scales were due to differences in simulated GPP in the tropics. Thirdly, it was shown that spatial resolution (0. 5° × 0. 5°, 1° × 1° and 2° × 2°) had little impact on simulated GPP on these large scales, with global GPP ranging from 140 to 142 PgC year−1. Finally, the sensitivity of JULES to meteorological driving data, a major source of model uncertainty, was examined. Estimates of annual average global GPP were higher when JULES was driven with the PRINCETON meteorological dataset than when driven with the WFDEI-GPCC dataset by 3 PgC year−1. On regional scales, differences between the two were observed, with the WFDEI-GPCC-driven model simulations estimating higher GPP in the tropics (5° N–5° S) and the PRINCETON-driven model simulations estimating higher GPP in the extratropics (30–60° N).
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Wang, Liming, Xuhui Lee, Wei Wang, Xufeng Wang, Zhongwang Wei, Congsheng Fu, Yunqiu Gao, et al. "A Meta-Analysis of Open-Path Eddy Covariance Observations of Apparent CO2 Flux in Cold Conditions in FLUXNET." Journal of Atmospheric and Oceanic Technology 34, no. 11 (November 2017): 2475–87. http://dx.doi.org/10.1175/jtech-d-17-0085.1.

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AbstractOpen-path eddy covariance systems are widely used for measuring the CO2 flux between land and atmosphere. A common problem is that they often yield negative fluxes or physiologically unreasonable CO2 uptake fluxes in the nongrowing season under cold conditions. In this study, a meta-analysis was performed on the eddy flux data from 64 FLUXNET sites and the relationship between the observed CO2 flux and the sensible heat flux was analyzed. In theory, these two fluxes should be independent of each other in cold conditions (air temperature lower than 0°C) when photosynthesis is suppressed. However, the results show that a significant and negative linear relationship existed between these two fluxes at 37 of the sites. The mean linear slope value is −0.008 ± 0.001 µmol m−2 s−1 per W m−2 among the 64 sites analyzed. The slope value was not significantly different among the three gas analyzer models (LI-7500, LI-7500A, IRGASON/EC150) used at these sites, indicating that self-heating may not be the only reason for the apparent wintertime net CO2 uptake. These results suggest a systematic bias toward larger carbon uptakes in the FLUXNET sites that deploy open-path eddy covariance systems.
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Seo, Hocheol, Jeongbin Kim, Hyesun Park, and Yeonjoo Kim. "Estimating Evapotranspiration with the Complementary Relationship at Fluxnet Sites Over Asia." Journal of The Korean Society of Civil Engineers 37, no. 2 (April 1, 2017): 303–10. http://dx.doi.org/10.12652/ksce.2017.37.2.0303.

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Wilson, Kell, Allen Goldstein, Eva Falge, Marc Aubinet, Dennis Baldocchi, Paul Berbigier, Christian Bernhofer, et al. "Energy balance closure at FLUXNET sites." Agricultural and Forest Meteorology 113, no. 1-4 (December 2002): 223–43. http://dx.doi.org/10.1016/s0168-1923(02)00109-0.

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Papale, Dario. "Ideas and perspectives: enhancing the impact of the FLUXNET network of eddy covariance sites." Biogeosciences 17, no. 22 (November 17, 2020): 5587–98. http://dx.doi.org/10.5194/bg-17-5587-2020.

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Abstract. In the last 20 years, the FLUXNET network provided unique measurements of CO2, energy and other greenhouse gas exchanges between ecosystems and atmosphere measured with the eddy covariance technique. These data have been widely used in different and heterogeneous applications, and FLUXNET became a reference source of information not only for ecological studies but also in modeling and remote sensing applications. The data are, in general, collected, processed and shared by regional networks or by single sites, and for this reason it is difficult for users interested in analyses involving multiple sites to easily access a coherent and standardized dataset. For this reason, periodic FLUXNET collections have been released in the last 15 years, every 5 to 10 years, with data standardized and shared under the same data use policy. However, the new tools available for data analysis and the need to constantly monitor the relations between ecosystem behavior and climate change require a reorganization of FLUXNET in order to increase the data interoperability, reduce the delay in the data sharing and facilitate the data use, all this while keeping in mind the great effort made by the site teams to collect these unique data and respecting the different regional and national network organizations and data policies. Here a proposal for a new organization of FLUXNET is presented with the aim of stimulating a discussion for the needed developments. In this new scheme, the regional and national networks become the pillars of the global initiative, organizing clusters and becoming responsible for the processing, preparation and distribution of datasets that users will be able to access in real time and with a machine-to-machine tool, obtaining always the most updated collection possible but keeping a high standardization and common data policy. This will also lead to an increase in the FAIRness (Findability, Accessibility, Interoperability and Reusability) of the FLUXNET data that will ensure a larger impact of the unique data produced and a proper data management and traceability.
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Dissertations / Theses on the topic "FLUXNET"

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Anayah, Fathi M. A. "Improving Complementary Methods To Predict Evapotranspiration For Data Deficit Conditions and Global Applications Under Climate Change." DigitalCommons@USU, 2012. https://digitalcommons.usu.edu/etd/1306.

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A reliable estimate of evapotranspiration (ET) in river basins is important for the purpose of water resources planning and management. ET represents a significant portion of rainfall in the water budget; therefore, the uncertainty in estimating ET can lead to the inaccurate prediction of water resources. While remote sensing techniques are available to estimate ET, such methods are expensive and necessary data may not be readily available. Classical methods of estimating ET require detailed land use/cover information that are not readily available in rural river basins. Complementary methods provide simple and reliable approaches to estimate ET using meteorological data only. However, these methods have not been investigated in detail to assess the overall applicability and the needs for revisions if any. In this work, an improved approach to use the complementary methods using readily available meteorological data is presented. The methodology is validated using 34 global FLUXNET sites with heterogeneous land use/cover, climatic, and physical conditions. The method was compared with classical methods using Ghana as a study area where original pioneering studies of ET have been performed. The work was extended to develop global maps of ET and water surplus (precipitation - ET) for the 20th century followed by climate change-induced 21st century estimates for 2040-2069 and 2070-2099 periods. The emission scenario used was the moderate A1B with the global climate models CGCM3.1 and HADGEM1. The results were assessed at different scales from global to regional such as for potential outcomes of climate change on ET and water surplus.
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Gibelin, Anne-Laure. "Cycle du carbone dans un modèle de surface continentale : modélisation, validation et mise en oeuvre à l'échelle globale." Phd thesis, Université Paul Sabatier - Toulouse III, 2007. http://tel.archives-ouvertes.fr/tel-00164054.

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ISBA-A-gs est une option du modèle de surface continentale du CNRM, ISBA, qui simule les échanges de carbone entre la biosphère terrestre et l'atmosphère. Au cours de cette thèse, le modèle est utilisé pour la première fois à l'échelle globale en mode forcé. Plusieurs simulations globales sont réalisées pour évaluer la sensibilité des flux turbulents et du LAI à un doublement de CO2 et au changement climatique prévu pour la fin du XXIe siècle.
Une nouvelle option du modèle, nommée ISBA-CC, est aussi développée afin de simuler de manière plus réaliste la respiration de l'écosystème, en distinguant la respiration autotrophe et la respiration hétérotrophe.
La validation de la dynamique de la végétation et des flux de carbone échangés, à la fois à l'échelle globale à l'aide de données satellitaires, et à l'échelle locale sur 26 sites de mesure du réseau FLUXNET, montre que le modèle de surface est suffisamment réaliste pour être couplé à un modèle de circulation générale, afin de simuler les interactions entre la surface continentale, l'atmosphère et le cycle du carbone.
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Bagnara, Maurizio. "Modelling biogeochemical cycles in forest ecosystems: a Bayesian approach." Doctoral thesis, country:IT, 2015. http://hdl.handle.net/10449/25094.

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Forest models are tools for explaining and predicting the dynamics of forest ecosystems. They simulate forest behavior by integrating information on the underlying processes in trees, soil and atmosphere. Bayesian calibration is the application of probability theory to parameter estimation. It is a method, applicable to all models, that quantifies output uncertainty and identifies key parameters and variables. This study aims at testing the Bayesian procedure for calibration to different types of forest models, to evaluate their performances and the uncertainties associated with them. In particular,we aimed at 1) applying a Bayesian framework to calibrate forest models and test their performances in different biomes and different environmental conditions, 2) identifying and solve structure-related issues in simple models, and 3) identifying the advantages of additional information made available when calibrating forest models with a Bayesian approach. We applied the Bayesian framework to calibrate the Prelued model on eight Italian eddy-covariance sites in Chapter 2. The ability of Prelued to reproduce the estimated Gross Primary Productivity (GPP) was tested over contrasting natural vegetation types that represented a wide range of climatic and environmental conditions. The issues related to Prelued's multiplicative structure were the main topic of Chapter 3: several different MCMC-based procedures were applied within a Bayesian framework to calibrate the model, and their performances were compared. A more complex model was applied in Chapter 4, focusing on the application of the physiology-based model HYDRALL to the forest ecosystem of Lavarone (IT) to evaluate the importance of additional information in the calibration procedure and their impact on model performances, model uncertainties, and parameter estimation. Overall, the Bayesian technique proved to be an excellent and versatile tool to successfully calibrate forest models of different structure and complexity, on different kind and number of variables and with a different number of parameters involved
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Blåbäck, Johan. "Singular Fluxes in Ten and Eleven Dimensions : Sources, Singularities, Fluxes and Spam." Doctoral thesis, Uppsala universitet, Teoretisk fysik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-221322.

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The energy content of our present universe is dominated by the dark-energy, or vacuum energy, which provides accelerated cosmic expansion. Dark energy has a possible effective explanation through a positive cosmological constant. The problem present in any fundamental theory is to explain the underlying dynamics of what gives rise to the cosmological constant. In string theory there are several scenarios that could give insight into what is behind the positive cosmological constant. One such construction uses anti-branes to achieve a net positive energy density of the vacuum. Anti-branes refers in this case to branes placed in a background with oppositely charged flux. As backreaction and localisation procedures are considered for anti-brane constructions a certain kind of singularity arise. This new type of singularity is present in the surrounding flux, which is not directly sourced by the brane. This thesis, and the works contained, considers several aspects of this type of singularity. The first such flux singularity were discovered for the anti-D3-branes, in which the approximations and assumptions of partial smearing and perturbative expansions are used. Included in this thesis are new anti-D6-brane solutions which are placed in oppositely charged flux. It is shown that after the anti-D6-branes are localised, they display the same type of singularity. The strength of this result lies in that it is possible to show the presence of the singularity beyond partial smearing and perturbative expansions. Similar to the anti-D6-brane solutions, new anti-M2-brane solutions are presented. These solutions are also argued to display the same type of singularity. The investigation into the presence of the singularity is just the first step. The second step is to deduce whether this singularity is acceptable and can somehow be resolved. Included in this thesis are two works that considers exactly this. One way of interpreting the singularity is through the absence of a no-force condition between the brane and the surrounding flux. This interpretation leads to the conclusion that the singularity is present due to the use of static Ansätze in a system that is inherently time dependent. Through an adiabatic approach it is here argued that this interpretation leads to a new type of instability. Another way of arguing for a possible resolution of this singularity is whether or not the singularity can be cloaked by an event horizon. This condition have been successful in other systems with singularities. It is argued in this thesis that it is not possible to hide the flux singularity behind a horizon. This leads to one out of two conclusions, either the condition is not a necessary one and the singularity can be resolved in a static manner, or the singularity does not have a resolution. To put these works in context the current singularities from anti-branes program is briefly reviewed to give a full overview of the current situation of these investigations.
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Román, Cascón Carlos. "Variability of turbulent fluxes (momentum, heat andCO2) during Upwelling conditions. A case study." Thesis, Uppsala universitet, Luft-, vatten och landskapslära, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-303975.

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Measurements of turbulent fluxes (momentum, sensible heat, latent heat and CO2) at two different heights were studied from data of a tower at Ostergarnsholm Island (Baltic Sea) during one week, while calculations using bulk formulations of fluxes were done with measurements in the tower and in two buoys moored at different locations. Different behaviors are found for the different fluxes. Measured latent heat flux shows higher correlation with calculations than measured sensible heat flux. For the CO2 flux, this relation was not found. Also all measured fluxes at the tower agree better with calculations when they are done under unstable conditions, meaning that the tower is better measuring the area where the measurements are taken in the buoys (near the tower). The studied period includes an upwelling and a high horizontal surface heterogeneity was found during most of the periods. It was seen using the comparison between calculated and measured fluxes and also using satellite images of the studied site. The footprint area is the area at some distance upwind from the tower where the surface conditions are influencing the measurements of the flux of some quantity at certain height in the tower, and this footprint area is continuously changing because its highly dependence with the stratification. Since during all the period the stratification was changing from slightly stable to slightly unstable conditions, the surface heterogeneity can also be seen in the variability of measured fluxes at different heights. One important conclusion in the study is that calculations of the fluxes using bulk formulations may not be useful when high variability of different parameters (as sea surface temperature and pCO2w ) is expected, as for example during upwelling situations and near coast, where the phytoplankton can significantly influence the concentration of CO2 at the surface. A wide study is done, including meteorological and oceanographic parameters, fluxes, comparisons, relations with parameters, transfer coefficients, dependences with the stratification and satellite images.
Mätningar av flöden (impuls, värme, vattenånga och CO2) vid två olika höjder studerades med data från en mast på ön Östergarnsholm (i Östersjön) under en vecka, beräkningar av flödena gjordes med mätningar av atmosfäriska parametrar från samma mast samt data från två bojar på två olika platser. Man fann olika beteenden för de beräknade och uppmätta flödena. Direkt (sensibelt) värme visade högre korrelation mellan beräkningar och uppmätta sensibla värmeflöden . För CO2- flödet fann man inte detta samband. För alla flödena överensstämmer mätningarna bättre med beräknade flöden när de är gjorda under instabila förhållanden, vilket betyder att under dessa förhållanden representerar mätningarna i masten bättre området där bojarna är placerade. Den studerade perioden inkluderar en period med upvällning (upwelling) och en hög horisontell variabilitet i ytparametrar under den största delen av denna period. Detta visades genom jämförelser mellan de beräknade och de uppmätta flödena och även genom satellitmätningar. Det område uppvind masten där ytan påverkar flöden uppmätta i masten på en viss nivå kallas ”footprint area”, och denna footprint area förändras kontinuerligt på grund av det stora beroendet av skiktningen i atmosfären. Eftersom skiktningen under hela perioden förändrades från något stabilt till något instabilt, kan ytvariabiliteten även ses i variationen av uppmätta flöden på olika höjder. En viktig slutsats i studien är att beräkningar av flödena som görs med standardformler inte bör användas vid förhållanden med hög horisontell och vertikal variation av olika parameter (som havsytetemperatur och pCO2w), som till exempel under uppvällningssituationer och nära kusten, där phytoplankton markant kan påverka koncentrationen av CO2 vid ytan. Studien inkluderar meteorologiska, oceanografiska parametrar, flöden, samband med parametrar, överförings koefficienter, beroende av stabilitet och satellitbilder.
Flujos turbulentos (momento, calor sensible, calor latente y CO2) en 2 alturas diferentes fueron estudiadas usando medidas de una torre en la Isla de Östergarnsholm (Mar Báltico) durante una semana. Los flujos también fueron calculados usando formulaciones con medidas de la torre y de dos boyas ancladas en diferentes localizaciones. Diferentes características para los distintos flujos fueron encontradas. El flujo de calor latente muestra una relación más alta con los cálculos que el flujo de calor sensible. No se encontró esta relación para el flujo de CO2. También, todos los flujos medidos en la torre coinciden mejor con los flujos calculados cuando estos son hechos bajo condiciones de estratificación inestable, significando que la torre mide mejor el área donde son cogidas las medidas en las boyas (cerca de la torre). El periodo estudiado incluye un afloramiento costero y se encontró una alta heterogeneidad horizontal en la superficie del mar durante la mayoría de los periodos. Esto fue estudiado usando las comparaciones entre flujos calculados y medidos y también usando imágenes de satélite. El footprint area puede ser definido como el área a una distancia desde la torre hacia donde sopla el viento donde las condiciones de la superficie influyen las medidas del flujo de alguna cantidad en la torre, y este footprint area está continuamente cambiando debido a su alta dependencia con la estratificación. Durante todo el periodo la estratificación estuvo cambiando desde ligeramente estable a ligeramente inestable, y por ello la heterogeneidad de la superficie puede ser vista en la variabilidad de los flujos medidos a diferentes alturas. Una conclusión importante en este estudio es que los cálculos de los flujos usando formulaciones podrían no ser útiles cuando se espera una alta variabilidad de los diferentes parámetros (temperatura superficial del mar y pCO2w), como por ejemplo durante situaciones de afloramiento y también cerca de costa, donde el fitoplancton puede influenciar significativamente la concentración de CO2 en la superficie. Se presenta un amplio estudio, incluyendo parámetros meteorológicos y oceanográficos, comparaciones de flujos, relaciones con parámetros, coeficientes de transferencia, dependencias con la estratificación e imágenes de satélite.
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Thompson, Andrew F. "Eddy fluxes in baroclinic turbulence." Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2006. http://wwwlib.umi.com/cr/ucsd/fullcit?p3225998.

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Thesis (Ph. D.)--University of California, San Diego, 2006.
Title from first page of PDF file (viewed October 10, 2006). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 173-182).
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Gould, Gwyn William. "Calcium fluxes in sarcoplasmic reticulum." Thesis, University of Southampton, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.259665.

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Ježek, Jaroslav. "Fluxmetr s grafickým zobrazením B-H křivky." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218264.

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This work deals with simple fluxmeter which is able, together with other device, to show hysteresis loop. Hysteresis loop is a graphic expression of dependence of magnetic induction on intensity of magnetic field. Oscilloscope is used to display the hysteresis loop. This device is fully sufficient for the display. The measured objects are solenoids from various kinds of materials with the same shape. The main aim of this work is the design, realization and description of the fluxmeter. The fluxmeter consists of several partial blocks. The first one, on which this work is focused, is signal generator which is able to generace different kinds of signal. The generated signal comes on primary winding of solenoid where a magnetic field on a given intensity rises. An amplifier is used to obtain the sufficient intensity. Next thing this work is focused on is the design of the integrator which is necessary for the correct function of the fluxmeter. As suggested, there is shown the block diagram of linking of individual parts. There are described the measured results at the end of this work.
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Murdock, P. R. "An investigation of solute fluxes in enterocytes and the relevance of these fluxes to diarrhoeal disease." Thesis, University of Bath, 1988. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.380946.

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Bryant, Anna C. "Parameterizing surface fluxes in the Arctic." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2001. http://handle.dtic.mil/100.2/ADA397342.

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Thesis (M.S. in Meteorology and Physical Oceanography) Naval Postgraduate School, Sept. 2001.
Thesis advisor: Guest, Peter S. "September 2001." Includes bibliographical references (p. 63-64). Also available in print.
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Books on the topic "FLUXNET"

1

J, Schweiger Axel, and United States. National Aeronautics and Space Administration., eds. Tools for atmospheric radiative transfer: Streamer and FluxNet. [Washington, DC: National Aeronautics and Space Administration, 1998.

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J, Schweiger Axel, and United States. National Aeronautics and Space Administration., eds. Tools for atmospheric radiative transfer: Streamer and FluxNet. [Washington, DC: National Aeronautics and Space Administration, 1998.

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Institute of Metals. Ironmaking and Steelmaking Committee. and Société française de métallurgie, eds. 3rd International Conference on Molten Slags and Fluxes: 27-29 June, 1988, University of Strathclyde, Glasgow. London: Institute of Metals, 1989.

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International Conference on Molten Slags, Fluxes, and Salts '97 (5th 1997 Sydney, Australia). Proceedings of the 5th International Conference on Molten Slags, Fluxes, and Salts '97: January 5-8, 1997, Sydney, Australia. Warrendale, PA: The Society, 1996.

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Wisniewski, Joe, and R. Neil Sampson, eds. Terrestrial Biospheric Carbon Fluxes:. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1982-5.

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Geernaert, G. L., and W. L. Plant, eds. Surface Waves and Fluxes. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-2069-9.

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Geernaert, G. L., and W. L. Plant, eds. Surface Waves and Fluxes. Dordrecht: Springer Netherlands, 1990. http://dx.doi.org/10.1007/978-94-009-0627-3.

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Dickson, Robert R., Jens Meincke, and Peter Rhines, eds. Arctic–Subarctic Ocean Fluxes. Dordrecht: Springer Netherlands, 2008. http://dx.doi.org/10.1007/978-1-4020-6774-7.

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Chiarlone, Bruno. Fluxit: My hand book. Dugort, Achill Island, County Mayo, Ireland: Redfoxpress, 2009.

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Groundwater fluxes across interfaces. Washington, D.C: National Academies Press, 2004.

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Book chapters on the topic "FLUXNET"

1

Foken, Thomas. "What Can We Learn for a Better Understanding of the Turbulent Exchange Processes Occurring at FLUXNET Sites?" In Energy and Matter Fluxes of a Spruce Forest Ecosystem, 461–75. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-49389-3_19.

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Xiao, Jingfeng. "Assessing Net Ecosystem Exchange of Carbon Dioxide Between the Terrestrial Biosphere and the Atmosphere Using Fluxnet Observations and Remote Sensing." In Springer Remote Sensing/Photogrammetry, 149–69. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-25047-7_6.

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Wichura, Bodo, Johannes Ruppert, Michael Riederer, and Thomas Foken. "Isotope Fluxes." In Energy and Matter Fluxes of a Spruce Forest Ecosystem, 209–45. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-49389-3_10.

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Gasik, Mikhail, Viktor Dashevskii, and Aitber Bizhanov. "Electrofused Fluxes." In Ferroalloys, 363–68. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-57502-1_24.

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Muntean, Adrian. "Transport Fluxes." In Continuum Modeling, 57–69. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-22132-8_3.

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Baron, Jill. "Biogeochemical Fluxes." In Biogeochemistry of a Subalpine Ecosystem, 218–31. New York, NY: Springer New York, 1992. http://dx.doi.org/10.1007/978-1-4612-2788-5_10.

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Moncrieff, John B., Paul G. Jarvis, and Ricardo Valentini. "Canopy Fluxes." In Methods in Ecosystem Science, 161–80. New York, NY: Springer New York, 2000. http://dx.doi.org/10.1007/978-1-4612-1224-9_12.

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Pinker, Rachel T. "Surface Radiative Fluxes." In Encyclopedia of Remote Sensing, 806–15. New York, NY: Springer New York, 2014. http://dx.doi.org/10.1007/978-0-387-36699-9_199.

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Moncrieff, John. "Surface Turbulent Fluxes." In Vegetation, Water, Humans and the Climate, 173–82. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-642-18948-7_15.

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Jackson, G., F. Joos, P. Nival, J. Rodriguez, U. Wolf, and P. Tett. "Modelling Particle Fluxes." In Towards a Model of Ocean Biogeochemical Processes, 227–36. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-642-84602-1_11.

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Conference papers on the topic "FLUXNET"

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Vanella, Daniela, Juan Miguel Ramirez-Cuesta, Simona Consoli, Antonio Motisi, and Mario Minacapilli. "Time-domain based feature space at FLUXNET sites for vegetation patterns identification." In 2019 IEEE International Workshop on Metrology for Agriculture and Forestry (MetroAgriFor). IEEE, 2019. http://dx.doi.org/10.1109/metroagrifor.2019.8909274.

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Pesquer, Lluís, Cristina Domingo-Marimon, Jordi Cristobal Roselló, Catherine Ottlé, Philippe Peylin, Francesca Bovolo, and Lorenzo Bruzzone. "Comparison of ecosystem functional type patterns at different spatial resolutions in relation with FLUXNET data." In Remote Sensing for Agriculture, Ecosystems, and Hydrology XXI, edited by Christopher M. Neale and Antonino Maltese. SPIE, 2019. http://dx.doi.org/10.1117/12.2533049.

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Ying, Wangmin, Ruibo Wang, Lu Niu, and Hua Wu. "A Comprehensive Assessment of Modis-Derived Instantaneous Net Surface Shortwave Radiation using the in-Situ Fluxnet Database." In IGARSS 2019 - 2019 IEEE International Geoscience and Remote Sensing Symposium. IEEE, 2019. http://dx.doi.org/10.1109/igarss.2019.8899249.

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Xie, Qiuxia, Qiting Chen, Peng Li, Li Jia, and Massimo Menenti. "Downscaling of ASCAT Soil Moisture with MODIS Products Based on Apparent Thermal Inertia in Areas around 54 FLUXNET Stations." In 2019 Photonics & Electromagnetics Research Symposium - Fall (PIERS - Fall). IEEE, 2019. http://dx.doi.org/10.1109/piers-fall48861.2019.9021918.

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Middleton, Elizabeth M., Yen-Ben Cheng, Thomas Hilker, Nicholas C. Coops, Karl F. Huemmrich, T. Andrew Black, and Praveena Krishnan. "Relating a Spectral Index from MODIS and Tower-Based Measurements to Ecosystem Light Use Efficiency for a Fluxnet-Canada Coniferous Forest." In IGARSS 2008 - 2008 IEEE International Geoscience and Remote Sensing Symposium. IEEE, 2008. http://dx.doi.org/10.1109/igarss.2008.4778989.

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Flix, Oriol, Carlos Luján, and César Elpuente. "State of the art of the regulatory framework and analysis of the technologies developed within the AEROFLEX project." In FISITA World Congress 2021. FISITA, 2021. http://dx.doi.org/10.46720/f2021-epv-081.

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AEROFLEX - AEROdynamic and FLEXible Trucks for Next Generation of Long Distance Road Transport –project, which receives funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No. 769658, started in October 2017 with the objective of developing and demonstrating new technologies, concepts and architectures for complete vehicles that are energy efficient, safe, comfortable, configurable and cost-effective, while ensuring that the varying need of costumers are satisfied by being flexible and adaptable with respect to the continuously changing operational conditions. In order to understand the origin of this project, an overview of the previous initiatives will be introduced and the main take away messages will be adopted. Projects used as a baseline are: TRANSFORMERS project - Grant Agreement No. 605170, FALCON Project - CEDR Call 2015 Freight and Logistics in a Multimodal Context, and finally, FLUXNET - CEDR Call 2015 Freight and Logistics in a Multimodal Context. In addition, one of the main pillars of AEROFLEX project is the drafting of coherent recommendations for revising standards and legislative frameworks in order to allow the new aerodynamic and flexible vehicle concepts on the road. These recommendations will be addressed to policy-makers, authorities and industry on standardization. This input will count with the support of the AEROFLEX Sounding Board, which is a group of experts that comprises key representative from authorities, policymakers, freight logistics operators and industry. At the end of the project, by 2021, these recommendations will be compiled in a handbook, which will be submitted to the European Commission. This paper summarizes the results and outputs obtained so far. It comprises the State of the Art with regards to the current regulatory framework, the current boundaries and constraints within the European transport and logistics industry are identified and the results from the workshops organized with the Sounding Board members.
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Wenskovitch, John E., James C. Lombardi, and Roger W. M. Hatfull. "FluxE." In SA '16: SIGGRAPH Asia 2016. New York, NY, USA: ACM, 2016. http://dx.doi.org/10.1145/3002151.3002154.

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Gaisser, T. K. "Atmospheric neutrino fluxes." In Next generation nucleon decay and neutrino detector. AIP, 2000. http://dx.doi.org/10.1063/1.1361736.

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Gaisser, Thomas K. "Atmospheric Neutrino Fluxes." In Proceedings of Nobel Symposium 129. WORLD SCIENTIFIC, 2006. http://dx.doi.org/10.1142/9789812773906_0007.

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Kulkarni, Shailesh. "Hawking fluxes and covariant anomalies." In Black Holes in General Relativity and String Theory. Trieste, Italy: Sissa Medialab, 2009. http://dx.doi.org/10.22323/1.075.0006.

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Reports on the topic "FLUXNET"

1

Olson, R. J., S. K. Holladay, R. B. Cook, E. Falge, D. Baldocchi, and L. Gu. FLUXNET. Database of fluxes, site characteristics, and flux-community information. Office of Scientific and Technical Information (OSTI), February 2004. http://dx.doi.org/10.2172/1184413.

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Agarwal, Deborah A., Marty Humphrey, Catharine van Ingen, Norm Beekwilder, Monte Goode, Keith Jackson, Matt Rodriguez, and Robin Weber. Fluxnet Synthesis Dataset Collaboration Infrastructure. Office of Scientific and Technical Information (OSTI), February 2008. http://dx.doi.org/10.2172/951101.

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Orazietti, J., R. Fraser, C. Butson, R. Latifovic, and W. Chen. Landsat ETM+ classificaiton of Fluxnet Canada flux stations. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2004. http://dx.doi.org/10.4095/220088.

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Baldocchi, Dennis, Deb Agarwal, Margaret Torn, and Marty Humphrey. Connecting AmeriFlux to the Globe, Extending the Partnership with Global Flux Network FLUXNET. Office of Scientific and Technical Information (OSTI), August 2018. http://dx.doi.org/10.2172/1487146.

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Luo, Yiqi. Data Synthesis and Data Assimilation at Global Change Experiments and Fluxnet Toward Improving Land Process Models. Office of Scientific and Technical Information (OSTI), September 2017. http://dx.doi.org/10.2172/1389295.

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Moum, James N. Turbulence Fluxes. Fort Belvoir, VA: Defense Technical Information Center, January 1996. http://dx.doi.org/10.21236/ada329288.

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Youinou, Gilles Jean-Michel. Neutron fluxes in test reactors. Office of Scientific and Technical Information (OSTI), January 2017. http://dx.doi.org/10.2172/1369358.

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Mahrt, Larry. Surface Fluxes under Weak Wind Conditions. Fort Belvoir, VA: Defense Technical Information Center, August 2005. http://dx.doi.org/10.21236/ada438299.

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Kachru, Shamit. Hierarchies from Fluxes in String Compactifications. Office of Scientific and Technical Information (OSTI), July 2001. http://dx.doi.org/10.2172/784970.

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Mahrt, Larry. Surface Fluxes under Weak Wind Conditions. Fort Belvoir, VA: Defense Technical Information Center, September 2002. http://dx.doi.org/10.21236/ada629061.

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