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 17 of 17 for “"carbon cycles"”.
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Carbon in Silicate Melt - Experimental Constraints and Applications for the Subduction Zone and Magma Ocean Carbon Cycles
… settings of the Earth throughout its history. Carbon concentrations and speciation were measured using FTIR, and in the process, we determined absorption coefficients for the CO2 species (CO2mol. and CO32-) for natural rhyolitic glass. We also developed empirical and thermodynamically-based …
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Theory and Evolutionary Evidence of the Autocatalytic Oxygenation of Earth’s Surface Environment
… a mathematical model of Earth’s oxygen and carbon cycles and explores the dynamics of these two cycles during oxygenation events. From the perspective of non linear dynamics, this mathematical model interprets Earth’s oxygenations as dynamical bifurcations of the oxygen cycle and the …
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Understanding the CO₂cycle in the North Pacific Ocean using inverse box models
… the Hamburg model. A model of the nutrient and carbon cycles in the North Pacific north of 24°N is formulated, and water flow rates, eddy mixing coefficients, particle fluxes and air-sea exchange rates of fresh water, heat, CO2 and 02 are calculated. The model incorporates geostrophy, …
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Hillslope-scale soil moisture estimation with a physically-based ecohydrology model and L-band microwave remote sensing observations from space
… that links the global water, energy, and carbon cycles. Knowledge of soil moisture at scales of individual hillslopes (10's to 100's of meters) is critical to advancing applications such as landslide prediction, rainfall-runoff modeling, and wildland fire fuel load assessment. This thesis …
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The effects of grassland management practices, and the role of hedgerows, on farmland carbon sequestration and storage
… agricultural landscapes, play a crucial role in carbon cycle dynamics with the ability to convert land from a carbon source to carbon sink. Practises influencing carbon sequestration and storage of land are currently missing from inventories of GHG releases at both national and local scales. The …
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An Isotopic Analysis of Carbon Dynamics in Sphagnum Peat
Methane and carbon dioxide produced in peatlands can be held temporarily in dissolved surface waters and accessible to aquatic plants. The primary peat building plant in northern peatlands, Sphagnum moss, grows in these dissolved carbon rich waters. Understanding Sphagnum carbon cycles is key for …
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Stratigraphic response to Cordilleran processes along the south central Andean margin
… dynamics, surface processes, and climate-carbon cycles. Resolving the feedbacks and relationships among these components has been a longstanding challenge in Earth science with broad implications for understanding coupling among rheology, deformation, and erodibility. The sedimentary …
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The marine biogeochemistry of dissolved and colloidal Iron
… to Fe limitation, effectively linking the Fe and carbon cycles. Understanding the marine biogeochemical cycling and composition of dFe was the focus of this thesis, with an emphasis on the role of the size partitioning of dFe (<0.2μm) into soluble (sFe<0.02μm) and colloidal (0.02μm<cFe<0.2μm) size …
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Tracing Carbon Dynamics in the Southern Ocean and Great Barrier Reef Using Strontium and Calcium
This study examines carbon cycling in the Southern Ocean and the Great Barrier Reef using strontium (Sr) and calcium (Ca) tracers. Traditionally, major cations like Ca and Sr were considered to have constant concentrations due to their long residence times. However, recent studies reveal that when …
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Tracing Carbon Dynamics in the Southern Ocean and Great Barrier Reef Using Strontium and Calcium
This study examines carbon cycling in the Southern Ocean and the Great Barrier Reef using strontium (Sr) and calcium (Ca) tracers. Traditionally, major cations like Ca and Sr were considered to have constant concentrations due to their long residence times. However, recent studies reveal that when …
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The marine biogeochemistry of dissolved and colloidal iron
… to Fe limitation, effectively linking the Fe and carbon cycles. Understanding the marine biogeochemical cycling and composition of dFe was the focus of this thesis, with an emphasis on the role of the size partitioning of dFe (<0.2 jm) into soluble (sFe<0.02 jm) and colloidal (0.02ptm<cFe<0.2 m) …
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The Impacts of Disruptive Environmental Change on Vital Microbial Ecosystems
<p>Microbes both affect the global nutrient and carbon cycles that influence climate change and our modern environment, and are in turn influenced by environmental change. Through resource acquisition, metabolism, symbiosis with plants and other organisms, and functional & taxonomic composition, …
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Forest conservation through voluntary carbon offsetting interventions
… in the tropics is destabilising planetary carbon cycles, impacting biodiversity and affecting societies the world over. Multiple strategies have been put in place to reduce threats to tropical forests through integrated conservation and sustainable development projects. Reducing Emissions …
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Seasonal Influences on the Carbon-Water Relations in Ponderosa Pine Forests in the Northern Boundary of the North American Monsoon System
… are essential to better understand the water and carbon cycles, and tree-ring research has contributed valuable knowledge in this regard. There is a common understanding that moisture-stress has significant impacts on forested ecosystems and thereby on the global carbon and water cycles. Under …
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Experimental warming of subarctic biocrust: Temporal responses of soil respiration and plant community
… is a significant contributor to biogeochemical cycles through nitrogen and carbon cycling. Further, it stabilizes soil, facilitates water infiltration, and mitigates soil erosion. The global biocrust cover is believed to decrease by about 25-40% in the next 60 years due to climate change and …
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Coupled Behaviour of Soil and Plant Water Dynamics: Effects of Vegetation Cover, Soil Type and Fire Disturbance
… soil water dynamics are crucial for terrestrial carbon uptake, agriculture and human livelihoods. As plants primarily rely on water uptake from the soil, soil and plant water dynamics are strongly coupled over most of the land surface. Soil and plant water dynamics also play a crucial role in …
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The biogeography and trophic roles of coastal marine sponges (Porifera) from the west coast of the North Island, New Zealand: Influences of catchments.
… sponges in processing terrestrially derived carbon was investigated by examining the proportional contribution of food from various sources to the diet of sponges on temperate rocky reefs. Our isotope analysis revealed that marine food sources including coastal seston (>1.2–400 µm), coastal …