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 19 of 19 for “"biological carbon pump"”.
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Biophysical interactions in the Iceland Basin
… bloom in this region acts as the most powerful biological carbon pump anywhere in the world oceans. Furthermore, the link between primary productivity and herbivory by the calanoid copepod, Calanus finmarchicus provides the trophic link between primary producers and the important commercial …
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Marine snow tracking stereo imaging system
The transport of particles of organic carbon from the ocean's surface to its bottom plays a key role in the global carbon cycle and carbon sequestration. Quantifying the rate of this Biological Carbon Pump - the size and velocity distribution of falling particles below the mixing layer, for example …
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OCEAN ACIDIFICATION: UNDERSTANDING THE COASTAL CARBON PUMP IN A HIGH CO2 WORLD
Since the 1800s, carbon dioxide emissions due to human activities have contributed significantly to the amount of carbon in the atmosphere. Approximately a third of this carbon is absorbed by the ocean, through air-sea fluxes at the ocean surface (Sabine, 2004). Increased CO2 has changed the carbon …
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A bio-optical approach to phytoplankton community sturcture, physiology and primary production on the Weddell Gyre
… detailed understanding of the sensitivity of the biological carbon pump to variability in physical forcing mechanisms in order to predict its continuing role. However, due to the remote and tempestuous nature of this region, in situ measurements of phytoplankton variability are scarce. …
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Anthropogenic and natural radioisotopes as tracers for contaminant sources and particulate fluxes
… utilized to trace and measure rates of chemical, biological, physical, and geological oceanographic processes. This thesis seeks to utilize both artificial (e.g., released from anthropogenic sources) and natural radioisotopes as tracers within the Pacific Ocean basin. Artificial radioisotopes …
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Anthropogenic and natural radioisotopes as tracers for contaminant sources and particulate fluxes
… utilized to trace and measure rates of chemical, biological, physical, and geological oceanographic processes. This thesis seeks to utilize both artificial (e.g., released from anthropogenic sources) and natural radioisotopes as tracers within the Pacific Ocean basin. Artificial radioisotopes …
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Particle Fluxes in the North-East Atlantic and Southern Ocean
… mechanism<br/>is the functioning of the biological pump which partitions carbon between the atmosphere and<br/>ocean reservoirs over relevant time scales. Current uncertainties revolve around the accuracy of<br/>upper ocean particle flux measurements, and the effect of iron and ballast …
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An investigation of basin-scale controls on upper ocean export and remineralization
The biological carbon pump (BCP) helps to moderate atmospheric carbon dioxide levels by bringing carbon to the deep ocean, where it can be sequestered on timescales of centuries to millennia. Climate change is predicted to decrease the efficiency of the global BCP, however, the magnitude and …
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An investigation of basin-scale controls on upper ocean export and remineralization
The biological carbon pump (BCP) helps to moderate atmospheric carbon dioxide levels by bringing carbon to the deep ocean, where it can be sequestered on timescales of centuries to millennia. Climate change is predicted to decrease the efficiency of the global BCP, however, the magnitude and …
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Quantifying ocean carbon and oxygen cycles using Biogeochemical Argo
The ocean plays an important role in the global carbon and oxygen cycles. Not only has it taken up one third of total anthropogenic carbon dioxide emissions, but it also produces 50% of the oxygen in the atmosphere due to phytoplankton that live in the surface ocean. This thesis explores different …
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Tracking carbon fluxes across ocean interfaces using dissolved gas observations
The cycling and exchange of carbon between Earth’s systems play a pivotal role in regulating climate, yet two major carbon fluxes remain poorly constrained: the biological carbon pump (BCP) and carbon release from Arctic permafrost. This thesis focuses on dissolved gases as tracers and drivers of …
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Spatio-Temporal Dynamics Of Phytoplankton Biomass From Ocean Color Remote Sensing And Cmip5 Model Suites
… the marine food web, and, importantly, drive the biological carbon pump, the combination of photosynthesis, organic carbon sinking and subsurface decomposition of organic matter which effectively sequesters carbon away from the atmosphere. Our knowledge of phytoplankton activity is currently …
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Tracking carbon fluxes across ocean interfaces using dissolved gas observations
The cycling and exchange of carbon between Earth’s systems play a pivotal role in regulating climate, yet two major carbon fluxes remain poorly constrained: the biological carbon pump (BCP) and carbon release from Arctic permafrost. This thesis focuses on dissolved gases as tracers and drivers of …
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Optical characterisation of Southern Ocean phytoplankton
… is critical to understanding the role of the Biological Carbon Pump (BCP). Satellite-based ocean colour remote sensing radiometry is the only observational capability that can provide synoptic views of upper ocean phytoplankton characteristics, at high spatial and temporal resolution of …
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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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Investigating the ocean’s biological pump using thorium-235 and polonium-210
… in the Earth’s ability to regulate atmospheric carbon dioxide, absorbing approximately one-third of all anthropogenically-emitted CO2. The biological pump is a mechanism which controls oceanic uptake of CO2 and sequestration of carbon into deeper waters. It is a complex web of processes starting …
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Particle export and flux through the Mesopelagic in the high-latitude north and South Atlantic
The biological carbon pump (BCP) is a significant part of the global carbon cycle, exporting ?10Gt of particulate organic carbon (POC) out of the euphotic zone each year. However, most of the exported POC is remineralized biologically within the upper few hundred metres of the mesopelagic, above …
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The seasonal cycling and physico-chemical speciation of iron on the Celtic and Hebridean shelf seas
… environments which contribute to atmospheric carbon dioxide drawdown and support large fisheries. The work presented in this thesis describes the seasonal cycle of Fe in the Celtic and Hebridean Shelf Seas, and determines the physico-chemical speciation of Fe supplied from oxic margins. The …
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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 …