Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 60 for “"terrestrial carbon"”.
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Controls on terrestrial carbon and nutrient cycling in Arctic permafrost environments
… the biogeochemical cycles that influence Arctic terrestrial systems will help improve models predicting future changes in northern latitudes. This research aims to determine the environmental controls on nutrient status and greenhouse gas exchange by assessing the relationships between …
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Late Quaternary climate variability and terrestrial carbon cycling in tropical South America
… and regional climate variability and climate-carbon cycle interactions in the past provides critical context for evaluating present and future climate trends. In this thesis, I use stable isotope and radiocarbon analysis of vascular plant biomarkers in lacustrine and marine sediment cores to …
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Late Quaternary climate variability and terrestrial carbon cycling in tropical South America
… and regional climate variability and climate-carbon cycle interactions in the past provides critical context for evaluating present and future climate trends. In this thesis, I use stable isotope and radiocarbon analysis of vascular plant biomarkers in lacustrine and marine sediment cores to …
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The terrestrial carbon cycle in transition: tracking changes using novel tracers on multiple timescales
Soils store more carbon than the atmosphere and terrestrial vegetation combined, therefore, changes in soil carbon storage can affect the global carbon budget. One of the forms in which carbon is exported from soil is as dissolved organic carbon (DOC). Upon release from soil, components of DOC can …
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Process-based simulation of the terrestrial biosphere : an evaluation of present-day and future terrestrial carbon balance estimates and their uncertainty
At present, carbon sequestration in terrestrial ecosystems slows the growth rate of atmospheric CO2 concentrations, and thereby reduces the impact of anthropogenic fossil fuel emissions on the climate system. Changes in climate and land use affect terrestrial biosphere structure and functioning at …
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Spatial and temporal dynamics of the terrestrial carbon cycle : assimilation of two decades of optical satellite data into a process-based global vegetation model
… presents the spatio-temporal distribution of terrestrial carbon fluxes for the time period of 1982 to 2002 simulated by a combination of the process-based dynamic global vegetation model LPJ and a 21-year time series of global AVHRR-fPAR data (fPAR – fraction of photosynthetically active …
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Estimates of global sources and sinks of carbon from land cover and land use changes
The distribution of sources and sinks of carbon over the land surface is dominated by changes in land use such as deforestation, reforestation, and agricultural management. Despite, the importance of land-use change in dominating long-term net terrestrial fluxes of carbon, estimates of the annual …
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Estimating Carbon Pool and Carbon Release due to Tropical Deforestation Using High-resolution Satellite Data
… an operational tool for monitoring biomass and carbon pool of tropical forest ecosystems. The method was applied to a test site of Bangladesh. The research used Landsat ETM+, Landsat TM and IRS pan images of 2001, 1992 and 1999 respectively. Geometrically corrected Landsat ETM+ imagery was …
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Mechanisms of terrestrial organic carbon export and preservation in the marine environment
Export of terrestrial carbon from land to sea is a globally important carbon flux that is poorly constrained and has implication for atmospheric carbon levels over modern and geologic timescales. Many factors control the fate of exported carbon and the subsequent impact on carbon budgets, including …
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Mechanisms of terrestrial organic carbon export and preservation in the marine environment
Export of terrestrial carbon from land to sea is a globally important carbon flux that is poorly constrained and has implication for atmospheric carbon levels over modern and geologic timescales. Many factors control the fate of exported carbon and the subsequent impact on carbon budgets, including …
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Unifying ecosystem concepts and mercury biomagnification in an estuarine environment using stable isotopes (delta-carbon-13 and delta nitrogen-15).
Isotope ratios of carbon (13C/12C) and nitrogen (15N/14N), on a parts per thousand (‰) basis relative to a standard, were used to trace carbon flows (delta 13C) and trophic positions of organisms (delta15N). Values of delta13C and delta15N were obtained for sediments, suspended particulate …
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Carbon management and scenario planning at the landscape scale with GIS
Carbon Management and Scenario Planning at the Landscape Scale with GIS By: Shabnam Delfan Azari It is now widely believed that globally averaged temperatures will rise significantly over the next 100 years as a result of increasing atmospheric concentrations of greenhouse gases (GHG) such as …
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Temporal, spatial, spectral and polarisation characteristics of the SAR backscatter from regenerating tropical forests
The establishment of an accurate global carbon budget and the consequent ability to understand and predict future environmental change is dependent on knowing the strength of terrestrial sinks and sources of carbon. Regenerating tropical forests are one of the major terrestrial carbon sinks as they …
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A Changing Climate Beneath Our Feet: How plant and microbial life in tropical soils are shifting and what that could mean for the future of our warming planet
Discussions about climate change and carbon sequestration have largely revolved around plant structures we can easily see, like leaves that absorb CO₂ for photosynthesis and woody trunks that store carbon as biomass. Carbon credits that companies and consumers buy to compensate for emissions …
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Peatland burning identification among other wildfires across different ecozones in Canada
… ecosystems storing substantial amounts of terrestrial carbon. Peatlands, traditionally resistant to burning, are increasingly at risk due to climate-induced warmer and drier conditions. This study specifically investigates the extent and characteristics of peat burning in the 2023 Canadian …
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Towards a paradigm shift in the modeling of soil organic carbon decomposition for earth system models
<p>Soils are the largest terrestrial carbon pools and contain approximately 2200 Pg of carbon. Thus, the dynamics of soil carbon plays an important role in the global carbon cycle and climate system. Earth System Models are used to project future interactions between terrestrial ecosystem carbon …
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Relative Role of Uncertainty for Predictions of Future Southeastern U.S. Pine Carbon Cycling
Predictions of how forest productivity and carbon sequestration will respond to climate change are essential for making forest management decisions and adapting to future climate. However, current predictions can include considerable uncertainty that is not well quantified. To address the need for …
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Aridification of the Indian subcontinent during the Holocene : implications for landscape evolution, sedimentation, carbon cycle, and human civilizations
… and the Arabian Sea (off the Indus River). Carbon isotopes of terrestrial plant leaf waxes (δ13Cwax) preserved in sediment provide integrated and regionally extensive records of flora for both sites. For the Godavari River basin the δ13Cwax record shows a gradual increase in aridity-adapted …
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Hydrological and ecological observations along the eastern Beaufort Sea coast of Alaska
… structure and assess dependence of fauna on terrestrial (CT) vs. marine sources of carbon, with particular focus on animals widely used by local subsistence hunters. Our mixing model results suggest that terrestrial carbon (CT) may be assimilated by upper trophic level consumers, though …
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