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 41 for “"carbon export"”.
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Distributional models of ocean carbon export
Each year, surface ocean ecosystems export sinking particles containing gigatons of carbon into the ocean’s interior. This particle flux connects the entire ocean microbiome and constitutes a fundamental aspect of marine microbial ecology and biogeochemical cycles. Particle flux is also variable …
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Distributional models of ocean carbon export
Each year, surface ocean ecosystems export sinking particles containing gigatons of carbon into the ocean's interior. This particle flux connects the entire ocean microbiome and constitutes a fundamental aspect of marine microbial ecology and biogeochemical cycles. Particle flux is also variable …
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Understanding terrestrial organic carbon export : a time-series approach
Terrestrial organic carbon (OC) erosion, remineralization, transport through river networks, and burial in marine sediments is a major pathway of the global carbon cycle. However, our ability to constrain these processes and fluxes is largely limited by (i) analytical capability and (ii) temporal …
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Lateral carbon export from the southern Benguela upwelling system
… of this study was to quantify the lateral export of organic carbon from the continental shelf of the southern Benguela upwelling system to the open ocean. The flux is potentially important because the Benguela is one of the most productive and biogeochemically active ecosystems in the …
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Lateral carbon export from the southern Benguela upwelling system
… of this study was to quantify the lateral export of organic carbon from the continental shelf of the southern Benguela upwelling system to the open ocean. The flux is potentially important because the Benguela is one of the most productive and biogeochemically active ecosystems in the …
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Understanding terrestrial organic carbon export : a time-series approach
Terrestrial organic carbon (OC) erosion, remineralization, transport through river networks, and burial in marine sediments is a major pathway of the global carbon cycle. However, our ability to constrain these processes and fluxes is largely limited by (i) analytical capability and (ii) temporal …
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Carbon export from natural iron fertilisation in the Southern Ocean
… phytoplankton blooms to efficiently sequester carbon to mesopelagic depths is<br/>still an open question. SubAntarctic islands in the HNLC Southern Ocean are a natural<br/>source of iron and thus fuel the annual phytoplankton blooms observed in their<br/>proximity. One such bloom, tied to the …
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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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Salt retention in wetland soils and effects on dissolved organic carbon export
… spots for many nutrients including carbon. The interactions between deicing salt runoff and wetland soil carbon were explored by measuring chloride export and retention, dissolved organic carbon (DOC) export, and carbon quality using mesocosm experiments. Net retention of Cl- 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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The Role of Zooplankton in Regulating Carbon Export and Phytoplankton Community Structure: Integrating Models and Observations
… vertical migration (DVM) to the vertical flux of carbon as part of the biological pump. I do this by constructing and analyzing a global model that includes DVM and is driven by satellite-based estimates of primary productivity. There has long been speculation about the significance of DVM to the …
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Turbulence in the sea ice impacted Southern Ocean and its implications for primary production and carbon export
… important regions on earth for the cycling of carbon and distribution of heat and freshwater around the globe. Here, along-isopycnal upwelling of warm, carbon-rich circumpolar deep water coincides with the annual growth and melt of Antarctic sea ice that represents one of the world's largest …
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Detecting spatial variation in hydrology and carbon export across a lake-rich permafrost landscape, Old Crow Flats, Yukon, Canada
… of spatial patterns in hydrology and carbon export across OCF, using a suite of water chemistry parameters, carbon concentrations and water and carbon isotope tracers. The spatial patterns detected are providing an important reference for ongoing investigations of how changing climate …
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Nitrogen and Carbon Export to the Gulf of Mexico by the Atchafalaya River, a Major Distributary of the Mississippi River
… This dissertation research examined nitrate and carbon export from the Atchafalaya River (AR) to: (1) determine nitrate processing by a river swamp basin under varied seasons, (2) investigate nitrate retention and processing in the AR during a major flood event, and (3) assess the relationship of …
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Nitrogen cycling in the South Atlantic and South Indian Oceans investigated using nitrate isotopes: implications for nutrient supply, ocean fertility, carbon export, and climate
Bioavailable nitrogen (N) limits phytoplankton growth across much of the (sub)tropical ocean, thereby modulating ocean fertility and climate. Dinitrogen (N2) fixation is the dominant source of new N to the ocean and is thought to occur mainly in well-lit, warm, oligotrophic waters. The …
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Particulate organic carbon and mineral export from the North and South Atlantic gyres : the 234Th/238U disequilibrium approach.
… ocean gyres are typically characterised by low carbon export into the deep ocean. However, due to their large area, even relatively small average carbon export may be globally significant. Strong correlations observed between deep-sea organic carbon, calcite and opal suggest that mineral phases …
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The oceanography, the biogeochemistry and the fluxes of carbon dioxide in the Benguela Upwelling System
… investigate the mechanisms which drive carbon fluxes in an eastern boundary coastal upwelling system of which the Benguela is one of four comparable examples in the world. Three hypotheses describe the way the key aspects of the problem: ■ The Benguela upwelling system is, by virtue of …
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Air-Sea CO2 Exchange and Carbon Dynamics in Foxe Basin: Findings from a 2023 Oceanographic Survey
… role in climate by removing large amounts of carbon dioxide (CO2) from the atmosphere through air-sea gas exchange. This process is particularly important in polar oceans, where sea-ice formation releases brine to the water column below and can create dense waters that sink and sequester …
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Plankton dynamics of the open Southern Ocean and surrounding the (Sub)Antarctic islands
… they fix dissolved atmospheric CO2 into organic carbon biomass, much of which supports the ocean food web and a portion of which sinks into the ocean interior, thereby removing atmospheric CO2 on decadal to centennial timescales (i.e., the biological carbon pump). The importance of plankton …
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