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Дисертації з теми "Carbon cycle (Biogeochemistry)"

Автор: Grafiati

Опубліковано: 4 червня 2021

Оновлено: 29 липня 2024

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1

Cordova, Vicente D. "Regional-scale carbon flux estimation using MODIS imagery." Virtual Press, 2005. http://liblink.bsu.edu/uhtbin/catkey/1325989.

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The National Aeronautics and Space Agency NASA's Moderate Resolution Imaging Spectroradiometer (MODIS) platform carried by Terra and Aqua satellites, is providing systematic measurements summarized in high quality, consistent and well-calibrated satellite images and datasets ranging from reflectance in the visible and near infrared bands to estimates of leaf area index, vegetation indices and biome productivity. The objective of this research was to relate the spectral responses and derived MODIS products of ecosystems, to biogeochemical processes and trends in their physiological variables. W

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2

Halloran, Paul R. "Rapid changes in the global carbon cycle." Thesis, University of Oxford, 2008. http://ora.ox.ac.uk/objects/uuid:cfb93401-3313-4948-a74b-e7e44a068f15.

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The flux of carbon in to and out of the atmosphere exerts a fundamental control over the Earth's climate. The oceans contain almost two orders of magnitude more carbon than the atmosphere, and consequently, small fluctuations within the oceanic carbon reservoir can have very significant effects on air-sea CO<sub>2</sub> exchange, and the climate of the planet. Pelagic carbonates represent a major long-term flux of carbon from the surface ocean to deep-sea sediments. Within sediments, the biologically produced carbonates act as a longterm carbon store, but also as chemical recorders of past sur

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3

Holmes, Brett. "Mobilization of Metals and Phosphorous from Intact Forest Soil Cores by Dissolved Inorganic Carbon: A Laboratory Column Study." Fogler Library, University of Maine, 2007. http://www.library.umaine.edu/theses/pdf/HolmesB2007.pdf.

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4

Trudinger, Catherine Mary. "The carbon cycle over the last 1000 years inferred from inversion of ice core data /." Full text, 2000. http://www.dar.csiro.au/publications/Trudinger_2001a0.htm.

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5

Ridgwell, Andy J. "Glacial-interglacial perturbations in the global carbon cycle." Thesis, University of East Anglia, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.365134.

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6

Kambis, Alexis Demitrios. "A numerical model of the global carbon cycle to predict atmospheric carbon dioxide concentrations." W&M ScholarWorks, 1995. https://scholarworks.wm.edu/etd/1539616709.

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A numerical model of the global carbon cycle is presented which includes the effects of anthropogenic &CO\sb2& emissions &(CO\sb2& produced from fossil fuel combustion, biomass burning, and deforestation) on the global carbon cycle. The model is validated against measured atmospheric &CO\sb2& concentrations. Future levels of atmospheric &CO\sb2& are then predicted for the following scenarios: (1) Business as Usual (BaU) for the period 1990-2000; (2) Same as (1), but with no biomass burning; (3) Same as (1), but with no fossil fuel combustion; (4) Same as (1), but with a doubled atmospheric &CO

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7

Carozza, David. "Carbon cycle box modeling studies of the Paleocene-Eocene thermal maximum." Thesis, McGill University, 2009. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=66818.

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Approximately 55 million years ago, an unprecedented amount of light carbon was abruptly released into the ocean and atmosphere. This event, known as the Paleocene-Eocene thermal maximum (PETM), is documented by large negative carbon isotope excursions in marine and soil carbonates and by global environmental changes. Models have been applied to constrain the amount of carbon released during the PETM. In this study, the Walker-Kasting carbon cycle box model is revisited and, after correcting its carbon isotope equations, it is used to resolve a discrepancy in previous emissio

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8

Smith, Joanne Caroline. "Particulate organic carbon mobilisation and export from temperate forested uplands." Thesis, University of Cambridge, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.648250.

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9

Ferretti, Dominic Francesco. "The development and application of a new high precision GC-IRMS technique for N₂O-free isotopic analysis of astmospheric CO₂." [Wellington, New Zealand] : Victoria University of Wellington, 1999. http://catalog.hathitrust.org/api/volumes/oclc/154329143.html.

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10

Bachman, Sarah. "Elevated atmospheric carbon dioxide and precipitation alter ecosystem carbon fluxes over northern mixed-grass prairie at the prairie heating and CO2 enrichment (PHACE) experiment in Cheyenne, Wyoming, USA." Laramie, Wyo. : University of Wyoming, 2007. http://proquest.umi.com/pqdweb?did=1445355711&sid=1&Fmt=2&clientId=18949&RQT=309&VName=PQD.

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11

Wang, Yi 1969. "Simulation of the climate, ocean, vegetation and terrestrial carbon cycle in the holocene." Thesis, McGill University, 2005. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=86064.

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In this thesis, the "green" McGill Paleoclimate Model (MPM) is developed by interactively coupling the five-component physical MPM with a Dynamic Global Vegetation Model (DGVM) known as VECODE (VEgetation COntinuous DEscription model). Three applications to the pre-industrial Holocene climate, ocean, vegetation and terrestrial carbon cycle dynamics are presented, after a new land surface scheme is introduced. In these applications, orbital (Milankovitch) forcing and prescribed atmospheric CO2, starting from eight thousand years before present (8 kyr BP), are applied. In addition, a pres

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12

Blodau, Christian. "Carbon biogeochemistry in northern peatlands : regulation by environmental and biogeochemical factors." Thesis, McGill University, 2001. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=38154.

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Nitrogen and sulfur deposition and water table level fluctuations have the potential to influence the C biogeochemistry in peatlands. Processes in peatland mesocosms were examined under steady state and dynamic conditions at different rates of N and S deposition, and water table levels. Net turnover rates were calculated from diffusive-advective mass-balances of pore water constituents. The limitations of the approach were tested with tracer experiments, which showed that diffusive-advective transport adequately described the flow of dissolved substances in peat columns. Incubation experiments

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13

Roehm, Charlotte L. "Carbon dynamics in northern peatlands, Canada." Thesis, McGill University, 2003. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=19545.

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Biogeochemical carbon dynamics govern the ability of peatlands to storecarbon. The processes controlling the balance between the photosyntheticuptake of C02 and respiration of C02 and CH4 back to the atmosphere remainunclear. A process-based ecosystem biogeochemical study, encompassing tracegas flux measurements, laboratory chemical analyses and field analyses, wasundertaken in order to better understand the carbon dynamics of borealCanadian peatlands.

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14

Lee, Kern Y. "Carbon Cycling in Tropical Rivers: A Carbon Isotope Reconnaissance Study of the Langat and Kelantan Basins." Thèse, Université d'Ottawa / University of Ottawa, 2014. http://hdl.handle.net/10393/30429.

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Despite the importance of tropical rivers to the global carbon cycle, the nature of carbon cycling within these watersheds has been dealt with by only a handful of studies. The current work attempts to address this lack of information, using stable isotope and concentration measurements to constrain sources and sinks of carbon in two Peninsular Malaysian watersheds. The basins are located on the central-western and northeastern coasts of the Malaysian Peninsula, and are drained by the Langat and Kelantan Rivers, respectively. Water samples were collected from three points along the two rivers

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15

Van, Mooy Benjamin A. S. "Carbon and phosphorus cycling by phylogenetically-defined groups of bacteria in the North Pacific Ocean /." Thesis, Connect to this title online; UW restricted, 2003. http://hdl.handle.net/1773/10985.

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16

Swanson, Mark Ellyson. "Measurement and modeling of the forest carbon resource in the Nothofagus forests of Tierra del Fuego, Chile /." Thesis, Connect to this title online; UW restricted, 2007. http://hdl.handle.net/1773/5491.

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17

Nuwer, Jonathan Mark. "Organic matter preservation along a dynamic continental margin : form and fates of sedimentary organic matter /." Thesis, Connect to this title online; UW restricted, 2008. http://hdl.handle.net/1773/10999.

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18

Braziunas, Thomas F. "Nature and origin of variations in late-glacial and Holocene atmospheric 14C as revealed by global carbon cycle modeling /." Thesis, Connect to this title online; UW restricted, 1990. http://hdl.handle.net/1773/6702.

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19

Jeschke, David. "A carbon cycle model of forestry in the Russian Far East /." Connect to materials related to title online, 2000. http://www.hps-inc.com/edu/stella/demo%5Fgate.htm.

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Thesis (M.A.)--University of Washington, 2000.<br>"All variants of the model, 9 scenarios and 31 sensitivity analyses are included on the CD. To run these requires Stella® software. A free runtime version of Stella® is available from the High Performance Systems website at: http://www.hps-inc.com/edu/stella/demo%5Fgate.htm"--Leaf 88. Includes bibliographical references (leaves 70-72).

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20

Mielke, Nora. "The role of nitrogen and phosphorus in carbon and nutrient cycling of bryophyte-dominated exosystems." Thesis, University of Aberdeen, 2016. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=231758.

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Bryophytes form an important component of northern vegetation communities. Mosses efficiently capture aerially deposited nutrients, restricting nutrient availability to the soil. Given that key ecosystem processes of northern ecosystems are nutrient-limited, understanding nutrient cycling of the moss layer is key to understanding ecosystem nutrient and C cycling in these systems. However, the role of the moss layer in regulating ecosystem-scale nutrient and C cycling, while potentially significant, is largely unknown. The aim of this thesis is to investigate the effect of the relative availabi

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21

Hotchkiss, Erin R. "Linking exotic snails to carbon cycling in Kelly Warm Springs, Grand Teton National Park." Laramie, Wyo. : University of Wyoming, 2007. http://proquest.umi.com/pqdweb?did=1402172011&sid=1&Fmt=2&clientId=18949&RQT=309&VName=PQD.

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22

Turner, Gavin D. "Benthic oxygen exchange across soft and hard bottoms using the new Eddy Correlation technique : case studies from the tropics to the Arctic." Thesis, University of the Highlands and Islands, 2014. https://pure.uhi.ac.uk/portal/en/studentthesis/benthic-oxygen-exchange-across-soft-and-hard-bottoms-using-the-new-eddy-correlation-technique(5335a5b3-7cf9-4913-9715-ab811f7e8a54).html.

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Marine sediments play an important role in the global carbon cycle, where they are ultimately important for recycling of carbon. At the sediment-water interface carbon is in constant movement both into and out of the sediment. However some environments are more important for the natural storage of carbon. Over long time scales this process has a role in climate regulation. Measuring the total O2 uptake represents a good proxy for the turnover of organic material at the sediment surface in oxygenated sediments, and equally the release of O2 represents benthic primary production. Many important

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23

Hagstrom, Kate. "Particle dynamics and shelf-basin interactions in the western Arctic Ocean investigated using radiochemical tracers /." View online ; access limited to URI, 2006. http://0-wwwlib.umi.com.helin.uri.edu/dissertations/fullcit/3239908.

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24

Cleary, Meagan B. "Carbon cycling dynamics during succession in sagebrush steppe." Laramie, Wyo. : University of Wyoming, 2007. http://proquest.umi.com/pqdweb?did=1362520811&sid=3&Fmt=2&clientId=18949&RQT=309&VName=PQD.

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25

Roberts, Chris David. "Numerical modelling of climate and the carbon cycle during the Cenozoic." Thesis, University of Cambridge, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.609403.

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26

Fraser, Colin J. D. "The hydrology and dissolved organic carbon (DOC) biogeochemistry in a boreal peatland /." Thesis, McGill University, 1999. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=30383.

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A hydrological and biogeochemical study was undertaken at the Mer Bleue bog, Ottawa, Ontario, Canada from May 22, 1998 to May 21, 1999. Basin runoff was generated by groundwater discharge at the peatland margin, and groundwater discharge was controlled by hydraulic gradients and horizontal hydraulic conductivities (Kh). Flux of dissolved organic carbon (DOC) measured at the basin outflow was 8.3 g C m-2 yr-1 and compared to within 23% of DOC flux estimated using a Dupuit approximation of seepage during the ice-free season. Annual DOC flux was 11% of the annual carbon sink.<br>Flownet analysis

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27

Hardison, Amber Kay. "Interactions between macroalgae and the sediment microbial community : nutrient cycling within shallow coastal bays /." W&M ScholarWorks, 2009. http://web.vims.edu/library/Theses/Hardison09.pdf.

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28

Bruckner, Monica Zanzola. "Biogeochemistry and hydrology of three alpine proglacial environments resulting from glacier retreat." Thesis, Montana State University, 2008. http://etd.lib.montana.edu/etd/2008/bruckner/BrucknerM1208.pdf.

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Proglacial environments, formed by glacier retreat, exhibit distinct characteristics in discharge, water temperature, water residence time, and dissolved ion, carbon, and suspended sediment concentrations. The unnamed alpine glacier at the headwaters of the Wheaton River, Yukon, Canada, provides an ideal setting to compare deglaciation processes that result in three different proglacial environments. The glacier has evolved from occupying one large catchment (~4 km 2) to two smaller catchments (each ~2 km 2) via glacier thinning and net mass loss, forming two lobes separated by a medial morain

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29

Dalva, Moshe. "Pathways, patterns and dynamics of dissolved organic carbon in a temperate forested swamp catchment." Thesis, McGill University, 1990. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=59625.

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Inputs of DOC in precipitation were low and increased with the passage of rainfall through different canopies. Throughfall, stemflow, leachates from A horizons and litterfall were identified as sources of DOC, while B and C horizons in upland areas provide a sink. Throughfall and stemflow displayed high temporal variability in DOC concentrations, while soil leachates and peat waters exhibited strong seasonal patterns. DOC concentrations in throughfall, stemflow and A horizons were highest in the predominantly coniferous site. In the fall, DOC concentrations from A horizons in the deciduous sit

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30

Yager, Patricia L. "The microbial fate of carbon in high-latitude seas : impact of the microbial loop on oceanic uptake of CO2 /." Thesis, Connect to this title online; UW restricted, 1996. http://hdl.handle.net/1773/11001.

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31

Elifantz, Hila. "Structure and function of microbial communities processing dissolved organic matter in marine environments." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 127 p, 2007. http://proquest.umi.com/pqdlink?did=1251898401&Fmt=7&clientId=79356&RQT=309&VName=PQD.

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32

Moore, Lucy. "The moss layer and ectomycorrhizal fungi as drivers of carbon and nutrient cycling in a Scots pine forest." Thesis, University of Aberdeen, 2015. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=225948.

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In boreal and northern temperate forests, the moss layer and ectomycorrhizal (ECM) fungi play important roles in carbon and nutrient cycling. ECM mycelium is present in the lower parts of the moss layer, but little is currently known about the interaction between these two key components of northern forest ecosystems. This thesis aims to address this knowledge gap and to improve our understanding of the mechanisms through which the moss layer and ECM fungi influence carbon and nutrient cycling. Nutrient transfer between litter and Scots pine seedlings in symbiosis with the ECM fungus Paxillus

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33

Arnarson, Thorarinn Sveinn. "Preservation of organic matter in marine sediments : a density fractionation and X-ray photoelectron spectroscopy approach /." Thesis, Connect to this title online; UW restricted, 2004. http://hdl.handle.net/1773/11050.

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34

Currey, Pauline M. "Interactions between atmospheric nitrogen deposition and carbon dynamics in peatlands." Thesis, University of Aberdeen, 2009. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=165545.

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Most undisturbed peatlands sequester carbon, and rising levels of atmospheric nitrogen deposition may have the potential to destabilize this function, possibly resulting in an increased release of carbon dioxide into the atmosphere. It is therefore of vital importance to investigate further the link between atmospheric nitrogen deposition and carbon dynamics in exposed ecosystems such as peatlands. The work described in this thesis aimed to elucidate the impact of increasing nitrogen on aspects of carbon turnover in peatlands. Using a long-term field-based experiment, I tested the effects of

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35

McEnroe, Nicola A. 1973. "Carbon biogeochemistry of open water pools on an ombrotrophic raised bog, James Bay, Québec, Canada." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=115691.

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Carbon (C) biogeochemical cycling studies in northern peatlands, in particular the production, consumption, storage and emission of C gases (CO2 and CH4) over space and time between different peatland landforms can help in understanding their current and future role in the global C cycle. In some peatlands, a distinct surface patterning of vegetation, interspersed with open water pools, controls the spatial and temporal variability in CO 2 and CH4 exchange to atmosphere. These open water pools initially develop from shallow, flooded hollows to deeper water bodies and at some point reach a limi

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36

Thatcher, Lisa A. "Carbon remineralization and storage in estuarine wetland sediments /." Electronic version (PDF), 2005. http://dl.uncw.edu/etd/2005/thatcherl/lisathatcher.pdf.

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37

Murphy, Paulette P. "The carbonate system in seawater : laboratory and field studies /." Thesis, Connect to this title online; UW restricted, 1996. http://hdl.handle.net/1773/8509.

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38

Van, der Merwe Margaretha Johanna. "Influence of hexose-phosphates and carbon cycling on sucrose accumulation in sugarcane spp." Thesis, Link to the online version, 2005. http://hdl.handle.net/10019/1257.

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39

Juranek, Lauren Wray. "Assessment of Pacific Ocean carbon production and export using measurements of dissolved oxygen isotopes and oxygen/argon gas ratios /." Thesis, Connect to this title online; UW restricted, 2007. http://hdl.handle.net/1773/11055.

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40

Culver, Mary Evans. "Applications of chlorophyll a fluorescence in bio-optical models of phytoplankton biomass and productivity / by Mary Evans Culver." Thesis, Connect to this title online; UW restricted, 1996. http://hdl.handle.net/1773/10966.

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41

Boys, Roderick Charles James. "The impact of anthropogenic land-use change on soil organic carbon, Oporae Valley, Lake Tutira, New Zealand : a [thesis] submitted to the Victoria University of Wellington in partial fulfilment of the requirements for the degree of Master of Science in Physical Geography /." ResearchArchive@Victoria e-Thesis, 2008. http://hdl.handle.net/10063/966.

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42

Sabetraftar, Karim. "The hydrological flux of organic carbon at the catchment scale : a case study in the Cotter River Catchment, Australia /." View thesis entry in Australian Digital Theses Program, 2005. http://thesis.anu.edu.au/public/adt-ANU20070502.141450/index.html.

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43

Bindon, Keren (Keren Ann). "Carbon partitioning in sugarcane internodal tissue with special reference to the insoluble fraction." Thesis, Stellenbosch : Stellenbosch University, 2000. http://hdl.handle.net/10019.1/51642.

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Thesis (MSc)--University of Stellenbosch, 2000.<br>ENGLISH ABSTRACT: The changes in carbon allocation to sucrose, hexoses, fibre, starch and respiration were investigated in developing internodes of sugarcane. Radiolabelling studies were conducted on internode 3, 6 and 9 tissue, representing three stages of increasing maturity. It was apparent that a high rate of cycling between triose-phosphate and hexose-phosphate occurred. A maximum of 50% of carbon entering triose-phosphates was returned to hexose-phosphate in internode 3 tissue, and this flux decreased with tissue maturity to 30%.

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44

Wong, Vanessa Ngar Lai. "The effects of salinity and sodicity on soil organic carbon stocks and fluxes /." View thesis entry in Australian Digital Theses Program, 2007. http://thesis.anu.edu.au/public/adt-ANU20080428.223144/index.html.

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45

Meiggs, Deidre Janelle. "Development of autonomous in situ techniques to examine the impacts of dynamic forcings on sediment biogeochemistry in highly productive estuarine ecosystems." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/37078.

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Characterized by high levels of terrestrial organic carbon inputs, estuaries and coastal marshes are among the most productive ecosystems on earth and significantly impact the global carbon cycle. Unfortunately, rates of natural organic matter (NOM) degradation in these environments are difficult to quantify directly due to the complex interaction between microbial respiration processes and abiotic reactions in these sediments, yet estuaries and marshes are considered both net sources and sinks of carbon. Typically carbon remineralization rates are determined by measuring total (TOU) and dif

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46

Koprivnjak, Jean-François. "Sources, sinks, and fluxes of dissolved organic carbon in subarctic fen catchments." Thesis, McGill University, 1991. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=60045.

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The sources, sinks, fluxes, spatial distributions, and temporal variations of dissolved organic carbon (DOC) in subarctic fen catchments as well as the temporal patterns of DOC in streams draining subarctic fen catchments in the region of Schefferville, Quebec were investigated.<br>In June to August sampling, DOC concentrations averaged 17 mg/L in peat water, 2-16 m/L in stream water, 49-56 mg/L in canopy throughfall, 14-19 mg/L in understory throughfall, 122-187 mg/L in stemflow, 25-39 mg/L in lichen and moss mat water, and 35-42 mg/L in soil A horizon water.<br>Precipitation and canopy and u

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47

Moyer, Ryan P. "Carbon Isotopes (δ¹³C & Δ¹⁴C) and Trace Elements (Ba, Mn, Y) in Small Mountainous Rivers and Coastal Coral Skeletons in Puerto Rico". The Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1227292285.

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48

Gougherty, Steven W. "Exudation Rates and δ¹³C Signatures of Bottomland Tree Root Soluble Organic Carbon: Relationships to Plant and Environmental Characteristics". The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1448818110.

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Dickens, Angela Faith. "Sources, cycling, and preservation of black carbon in sediments from the Washington Margin /." Thesis, Connect to this title online; UW restricted, 2004. http://hdl.handle.net/1773/8576.

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Gontikaki, Evangelia. "Carbon cycling in continental slope sediments : the role of benthic communities." Thesis, University of Aberdeen, 2010. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=128351.

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Анотація:

Previous pulse-chase experiments have revealed a wide diversity of benthic response patterns to organic matter (OM) input depending on environmental setting, benthic community structure and experimental conditions i.e. quantity and quality of the added OM. However, the mechanisms and interaction of environmental and biological factors that produce an observed response pattern are poorly understood. The present thesis set out to improve our current understanding on the set of parameters that determine benthic response patterns. The core of this study was based on two pulse-chase experiments i

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