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 99 for “"Global carbon cycle"”.
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Tracing the global carbon cycle with bomb radiocarbon
Bomb radiocarbon (14C) emitted to the atmosphere by nuclear explosion tests has not yet reached equilibrium within the Earth carbon system. In the present thesis this fate of radiocarbon is investigated using coarse-grid models to trace high-precision 14CO2 observations available in the atmosphere …
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Calcium isotope insight into the global carbon cycle
… was understanding the sedimentary sink for carbon. The formation of authigenic carbonate in marine sediments is caused by the microbial degradation of organic matter. I used pore fluid measurements and a numerical model to identify zones of authigenic carbonate precipitation. This knowledge …
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The role of diatoms in the global carbon cycle
The Dynamic Green Ocean Model PlankTOM5.3 is a global ocean biogeochemical model representing interactions between planktonic organisms, ocean and atmosphere. The plankton is divided into five Plankton Functional Types (PFTs), each playing a specific role in carbon and nutrient cycling and in the …
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Urbanised territories as a specific component of the global carbon cycle
… unterteilt. Es werden jährlich die regionale und globale Dynamik der C-Emissionen und des C-Exports sowie die C-Gesamtbilanz berechnet. Dabei liefern beide Modelle qualitativ ähnliche Ergebnisse, jedoch gibt es einige quantitative Unterschiede. Im ersten Modell erreicht die globale Jahresemission …
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CO2 Adsorption On Volcanic Ash: Net Contribution Of Volcanic Eruptions To The Global Carbon Cycle
<p>Adsorption of co2 on mineral surfaces accounts for a small percentage of the terrestrial co2 sink. Volcanic ash is virtually free of co2 when erupted and has a high surface area resulting in a high capacity for co2 adsorption. Volcanism is commonly assumed to be only a source of co2, but …
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On the role of the Southern Ocean in the global carbon cycle and atmospheric CO2 change
… circulation plays an important role in the global carbon cycle because altered communication between the atmosphere and abyss in the Southern Ocean is relatively well documented and often implicated in explanations of past and future climate changes, but the ambiguity of the …
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Emiliania huxleyi and climate change: a genetic and biogeographic investigation of bloom dynamics for a key phytoplankton species in the global carbon cycle
… coccolithophore present throughout the global ocean and capable of forming large blooms with significant effects on the global carbon cycle. Developing our understanding of E. huxleyi ecology is necessary in order to better quantify E. huxleyi’s role in the present carbon cycle, and to …
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Diel vertical migration and frontal variability of acoustic backscatter in the Balearic Sea
… happens in every ocean, and is important to the global carbon cycle. This thesis uses a combination of data that I helped acquire during the Office of Naval Research-funded CALYPSO 2022 field campaign in the Balearic Sea. Acoustic backscatter from a 38kHz ADCP and a 150kHz ADCP is translated into …
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Diel vertical migration and frontal variability of acoustic backscatter in the Balearic Sea
… happens in every ocean, and is important to the global carbon cycle. This thesis uses a combination of data that I helped acquire during the Office of Naval Research-funded CALYPSO 2022 field campaign in the Balearic Sea. Acoustic backscatter from a 38kHz ADCP and a 150kHz ADCP is translated into …
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Using Unmanned Aircraft to Provide Near Real-Time Updates of Biomass, Forest Structure and Land Use in the Western Amazon
… or labor-intensive inventory methods. Forest carbon is a key uncertainty in the global carbon cycle and is important for carbon conservation schemes. State-of-the-art techniques in forest carbon monitoring typically involve the use of accurate but costly manned aircraft to estimate aboveground …
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Bio-optische Modellierung des pelagischen Ökosystems nördlich der Kanarischen Inseln
… production plays a key role in researching the global carbon cycle. Based on results from several cruises the hydrographical, biological and optical situation north of the Canary Islands is presented and compared with previous published results. Light is a primary factor for growth in pelagic …
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Terrestrial Impacts of the Central Atlantic Magmatic Province on western Pangea
… has been associated with a disruption to the global carbon cycle due the emplacement of the Central Atlantic Magmatic Province (CAMP). Evidence has shown that this global carbon cycle perturbation may be the culprit for the end-Triassic extinction. The Whitmore Point Member of the Moenave …
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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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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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RECENT RIVERINE CARBON OF THE YELLOW RIVER: FLUXES, OUTGASSING AND BURIAL
Riverine carbon transport is an important component of global carbon cycle. Based on historical records and recent sampling during the period 2011-2012, the riverine carbon transport characteristics in the Yellow River were qualitatively and quantitatively investigated. Due to chemical weathering …
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Interactions of the Terrestrial Biosphere With Climate and Atmospheric Chemistry
… and have been shown to significantly impact global tropospheric chemistry and composition, climate and the global carbon cycle. In the second part of this dissertation, the sensitivity of biogenic isoprene and monoterpene emissions to combined and isolated fluctuations in observed climate and …
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Multi-Proxy Records of Climate and Carbon Cycle Perturbations in the Paleozoic: Integrating Isotope Geochemistry and Sedimentology
Carbonate rocks are a valuable archive of past environmental conditions. To glean robust information from this archive, we must understand how carbonate sediments form, ensure our analytical techniques are optimized, and consider how inherently local deposition of sediments can communicate …
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Determining timescales of natural carbonation of peridotite in the Samail Ophiolite, Sultanate of Oman
… timescales of the formation and preservation of carbonate alteration products in mantle peridotite is important in order to better understand the role of this potentially important sink in the global carbon cycle and also to evaluate the feasibility of using artificially-enhanced, in situ …
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Determining timescales of natural carbonation of peridotite in the Samail Ophiolite, Sultanate of Oman
… timescales of the formation and preservation of carbonate alteration products in mantle peridotite is important in order to better understand the role of this potentially important sink in the global carbon cycle and also to evaluate the feasibility of using artificially-enhanced, in situ …
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