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 14 of 14 for “"net community production"”.
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Variations in coral reef net community calcification and aragonite saturation state on local and global scales
Predicting the response of net community calcification (NCC) to ocean acidification (OA) and declining aragonite saturation state (Ωa) requires a thorough understanding of controls on NCC. The diurnal control of light and net community production (NCP) on NCC confounds the underlying control of Ωa …
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Variations in coral reef net community calcification and aragonite saturation state on local and global scales
Predicting the response of net community calcification (NCC) to ocean acidification OA and declining aragonite saturation state [Omega]a requires a thorough understanding of controls on NCC. The diurnal control of light and net community production (NCP) on NCC confounds the underlying control of …
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A determination of air-sea gas exchange and upper ocean biological production from five noble gases and tritiugenic helium-3
… was used to constrain upper ocean biological production. Specifically, the helium flux gauge technique was used to estimate new production, apparent oxygen utilization rates were used to quantify export production, and euphotic zone seasonal cycles of oxygen and argon were used to determine …
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A determination of air-sea gas exchange and upper ocean biological production from five noble gasses and tritiugenic helium-3
… was used to constrain upper ocean biological production. Specifically, the helium flux gauge technique was used to estimate new production, apparent oxygen utilization rates were used to quantify export production, and euphotic zone seasonal cycles of oxygen and argon were used to determine …
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How does plankton distribution and activity influence the variability of carbon dioxide uptake in the North Atlantic?
… a simple and inexpensive technique to estimate net community production in the surface ocean, with the potential to extend coverage of such measurements over wider regions at low cost. Two key observations were made in the northeast Atlantic. Firstly, the increase in SST was significantly …
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Seaglider observations of biogeochemical variability in the Iberian upwelling system.
… study, a novel attempt at calculating net community production (NCP) was completed using an oxygen inventory technique. Two major phytoplankton bloom events occurred during the deployment period, with respective peak Chl a concentrations of 9.65 and 11.23 mg m3. During these bloom …
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High-Resolution In Situ Oxygen-Argon Studies of Surface Biological and Physical Processes in the Polar Oceans
… (WAP) are the fastest warming regions on the planet and are undergoing rapid climate and ecosystem changes. Until we can fully resolve the coupling between biological and physical processes we cannot predict how warming will influence carbon cycling and ecosystem function and structure in these …
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Relating Biological Rate Measurements and Microbial Processes Across Diverse Ocean Ecosystems
… biogeochemical processes including primary production across the global ocean. Despite the importance of such interactions between the marine microbial community and ocean biogeochemistry, oceanographers have yet to attain a deep understanding of the ecological mechanisms underlying these …
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Insight into chemical, biological, and physical processes in coastal waters from dissolved oxygen and inert gas tracers
… and triple isotopic composition trace net and gross biological productivity. The saturation states of inert gases trace physical processes, such as air-water gas exchange, temperature change, and mixing, that affect all gases. First, I developed a field-deployable system that measures …
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Insight into chemical, biological, and physical processes in coastal waters from dissolved oxygen and inert gas tracers
… and triple isotopic composition trace net and gross biological productivity. The saturation states of inert gases trace physical processes, such as air-water gas exchange, temperature change, and mixing, that affect all gases. First, I developed a field-deployable system that measures …
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Biological oxygen production from oxygen-to-argon ratios and oxygen isotopologues in the Atlantic Ocean
… on O2/Ar ratios and O2 isotopologues to measure net community production (N) and gross oxygen production (G) in two different areas relevant for the marine C cycle: the South Atlantic subtropical gyre and the North Atlantic during a spring bloom. The former despite small rates of production it is …
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The Oceanography and Modelling of the Pontevedra Ria (NW Spain)
… different biogeochemical characteristics. Net community production (NCP) based on phosphate uptake was spatially and temporally variable, with rates of 9.6 and 20.2 mg C m ˉ² h ˉ¹ in central and internal rias in spring, respectively, and 30.3 and 29.0 mg C m ˉ² h ˉ¹ in the dry season. …
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Particle export and flux through the Mesopelagic in the high-latitude north and South Atlantic
… on thorium-234 disequilibria compared well with net community production measured by O2:Ar ratios over the 39d experiment, suggesting that these two methods can be meaningfully compared over ?month-long cruises.<br/><br/>Further work was conducted with a mesoscale array of four time-series …
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Exploring the Spatial Distribution of Marine Nitrogen Fixation Through Statistical Modeling, High-Resolution Observations and Molecular Level Characterization
… marine N2 fixation affects marine primary production, the uptake of carbon dioxide and ultimately the global climate. However, the environmental controls on N2 fixation and the physiologies of diverse diazotrophs remain elusive, in great part due to the limited number of observations. As …