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 “"Carbon sink"”.
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AGRICULTURAL SMALL WATER BODIES: CARBON SOURCE OR CARBON SINK?
… landmass is thought to be a major greenhouse gas sink (GHG), and while freshwaters were thought to be neutral entities, they may in fact be potent producers and emitters of CO2 and CH4. Little is known about their contribution to the global carbon budget, especially in agricultural landscapes. …
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Variability of the Global Ocean Carbon Sink (1998 through 2011)
In this thesis a newly developed 2–step neural network approach is used to reconstruct basin–wide monthly maps of the sea surface partial pressure of CO2 (pCO2) at a resolution of 1��1� for both the Atlantic Ocean from 1998 through 2007 and the global ocean from 1998 through 2011. From those, …
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The tropical peatland carbon sink: climatic drivers and modelling of peat accumulation at the pan-tropical scale
Tropical peatlands are carbon-dense ecosystems and act as a globally important carbon sink. However, uncertainties exist about the climatic and environmental drivers of carbon accumulation and about the future of the carbon sink with climate change. There are also relatively few modelling studies …
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Potential of above- and below-ground coarse woody debris as a carbon sink in managed and unmanaged forests
With respect to climate warming, carbon (C) sequestration is of important public and political interest. Forests represent important terrestrial C sinks. Their management can have direct and indirect influence on forest characteristics, including to some extent C sequestration. One direct effect of …
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Uncertainty in atmospheric CO₂ concentrations from a parametric uncertainty analysis of a global ocean carbon cycle model
Key uncertainties in the global carbon cycle are reviewed and a simple model for the oceanic carbon sink is developed and described. This model for the solubility sink of excess atmospheric CO2 has many enhancements over the more simple 0-D and 1-D box-diffusion models upon which it is based, …
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Evaluation and Application of the Community Land Model for Simulating Energy and Carbon Exchange in Agricultural Ecosystems
… and assessed CLM’s performance in simulating carbon and energy exchange for the conterminous United States. The results indicated that CLM4-Crop has a biased phenology during the early growing season and underestimated carbon emissions from corn and soybean sites. The carbon budget for the …
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Decarbonization strategies for North American urban landscapes: Evaluating pavements and vegetation across design typologies
… mitigation, yet remain underrepresented in carbon accounting frameworks relative to buildings and infrastructure. This thesis advances landscape carbon assessment by introducing a typology-based Life Cycle Assessment (LCA) framework for landscape architecture. The framework integrates …
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Carbon Dynamics in Extracted Minerotrophic Peatlands: An Analysis of the Effect of Plant Biodiversity
… of vegetation and convert peatlands from net sinks to persistent sources of carbon to the atmosphere. Peatland restoration has been shown to re‐establish the natural carbon sink function, however, current restoration techniques could be refined with more knowledge of the role of plant …
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Three essays on environmental valuation: the social value of carbon storage in wetlands, the impact of wind turbines on home prices, and the effect of flood risk on home prices
… of climate change, from the value of a blue carbon sink, the impact of renewable energy technology on property prices, and the effect of changing flood risk and coastal amenities on property prices. ☐ The first essay in this work looks at valuing changes in the economic value of carbon stored …
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Impacts of Elevated Carbon Dioxide and Tropospheric Ozone on the Growth and Productivity of Trees
"Forests are an integral part of the global carbon cycle. Any change in their capacity to assimilate carbon through photosynthesis has significant implications for global climate change in the 21st Century. The concentrations of two rising greenhouse gases, carbon dioxide ([CO2]) and tropospheric …
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Ecosystem metabolism in salt marsh tidal creeks and ponds : applying triple oxygen isotopes and other gas tracers to novel environments
… to evaluate the future role of salt marshes as a carbon sink. This thesis describes new methods to apply the triple oxygen isotope tracer of photosynthetic production in a salt marsh. Additionally, noble gases are applied to constrain air-water exchange processes which affect metabolism tracers. …
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Ecosystem metabolism in salt marsh tidal creeks and ponds : applying triple oxygen isotopes and other gas tracers to novel environments
… to evaluate the future role of salt marshes as a carbon sink. This thesis describes new methods to apply the triple oxygen isotope tracer of photosynthetic production in a salt marsh. Additionally, noble gases are applied to constrain air-water exchange processes which affect metabolism tracers. …
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Water balance and productivity of a Mediterranean oak woodland : Quantifying understory vegetation impacts by development of a stable oxygen isotope partitioning approach
… at disentangling vegetation impacts on water and carbon cycling of a Mediterranean savanna-type oak woodland. Special focus was laid on the seasonal understory impact on net ecosystem fluxes, soil water distribution and tree-understory interactions. Moreover, the impact of altered precipitation …
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Carbon cycling in the Caribbean reef-building coral Orbicella: quantitative evidence for enzymatic control of skeletal density banding and coral-endosymbiont physiological plasticity during seasonal environmental change
… by building a skeleton (composed of a calcium carbonate mineral called aragonite) that functions as a carbon sink, the mechanisms of coral health, growth, and survival have not been fully elucidated. This study demonstrates that corals, found on the leeward coast of Curacao in the Southern …
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Carbon fluxes at an upland blanket bog in the north Pennines
… found in blanket bogs are significant stores of carbon. The degree to which these ecosystems are currently functioning as sinks or sources of carbon is not clear. There is a paucity of measurements from suitable sites but the available evidence suggests that certain sites might be close to being …
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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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Vegetation cover change on Tindfjöll mountains, Iceland, assessed by aerial photographs, topography, and climate
… cover, which is playing an important role, as a carbon sink, for biodiversity, and for protecting against natural hazards. Less studied but equally important is to understand how mountain areas are responding to climate warming and how topography; elevation, aspect, and slope are affecting …
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Biogeochemical Alteration of Particulate Pyrogenic Organic Carbon (pyC)
… resistance of plant derived pyrogenic organic carbon (<em>py</em>C) to abiotic and biotic means of degradation has led to increased interest in the role of <em>py</em>C as a potential carbon sink, as well as a strategy for sequestering atmospheric CO2 to mitigate excess carbon emissions. Though …
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Carbon storage in grasslands : the impact of atmospheric nitrogen pollution
… chemical and biological processes involved in carbon cycling and storage in soil. This is especially significant as soil carbon storage is an essential form of climate change mitigation. However, there is a lot of uncertainty regarding the impact of nitrogen accumulation on terrestrial carbon …
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Forest futures
With recent interest in carbon emissions, wood has returned as a fashionable building material. Renewable, flexible, and a carbon sink, wood is increasingly seen as a material that responds to concerns of climate change. However, an acceptance of the Anthropocene demands a re-thinking of how humans …
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