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 20 for “"Atlantic water"”.
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An analysis of Atlantic Water in the Arctic Ocean using the Arctic Subpolar Gyre State Estimate and observations
The Atlantic Water (AW) Layer in the Arctic Subpolar gyre sTate Estimate (ASTE), a regional, medium-resolution coupled ocean-sea ice state estimate, is analyzed for the first time using bounding isopycnals. A surge of AW, marked by rapid increases in mean AW Layer potential temperature and AW Layer …
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An analysis of Atlantic water in the Arctic Ocean using the Arctic Subpolar gyre state estimate and observations
The Atlantic Water (AW) Layer in the Arctic Subpolar gyre sTate Estimate (ASTE), a regional, medium-resolution coupled ocean-sea ice state estimate, is analyzed for the first time using bounding isopycnals. A surge of AW, marked by rapid increases in mean AW Layer potential temperature and AW Layer …
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Water mass distribution and Polar Front structure in the Southwestern Barents Sea
The water mass distribution in the southwestern Barents Sea, the thermohaline structure of the western Barents Sea Polar Front, and the formation of local water masses are described based on an analysis of historical hydrographic data and a recent process-oriented field experiment. This study …
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On the pathways of the return flow of the meridional overturning circulation in the tropical Atlantic
A numerical model of the tropical Atlantic ocean is used to investigate the upper layer pathways of the Meridional Overturning Circulation (MOC) in the tropical Atlantic. The main focus of this thesis is on those parts of the tropical circulation that are thought to be important for the MOC return …
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On the pathways of the return flow of the meridional overturning circulation in the tropical Atlantic
A numerical model of the tropical Atlantic ocean is used to investigate the upper layer pathways of the Meridional Overturning Circulation (MOC) in the tropical Atlantic. The main focus of this thesis is on those parts of the tropical circulation that are thought to be important for the MOC return …
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Taxonomia e distribuição do gênero Lucifer (Decapoda, Sergestoidea) na costa central brasileira
… in high frequency and abundance in Coastal Water and L. typus occurred in low frequency and abundance in Tropical Water and mixed waters. Larvae occurred in higher densities in Coastal Water. The highest densities of L. faxoni and larvae occurred on Central South Atlantic Water inflow at …
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Overflows and upper ocean interactions : a mechanism for the Azores current
… model. Overflows are a major source of the dense water of the global deep ocean, originating from only a few marginal seas. They enter the open ocean as dense gravity currents down a continental slope and play a crucial role in the deep ocean circulation. To understand the dynamics of these …
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Composição, distribuição espaço - temporal e associações de espécies de Gastropoda do infralitoral de fundos inconsolidados da região do Cabo Frio, RJ, Brasil
… Some abiotic parameters of the sediment and water near the bottom were analysed. More than 50% of the samples presented water temperatura below 18°C, showing a strong influence of the Central South Atlantic Water in the studied area. The sediment varied from medium sand well sorted to fine …
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Mixing and dynamics of the Mediterranean outflow
… in the Strait with the saltiest, coldest water to the south and slightly fresher and warmer outflow to the north. As the outflow spreads, the northern near-shelf flow follows a path higher in the water column and mixes with warmer North Atlantic water than does the deeper offshore flow. …
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Overflows and upper ocean interaction : a mechanism for the Azores Current
… model. Overflows are a major source of the dense water of the global deep ocean, originating from only a few marginal seas. They enter the open ocean as dense gravity currents down a continental slope and play a crucial role in the deep ocean circulation. To understand the dynamics of these …
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Where the Ice Ends: Calving and Ice-Ocean Interactions at Helheim Glacier and Beyond
… is used to melt large icebergs from incoming Atlantic waters before that heat reaches the terminus. This process formed the basis for chapter 4 of this dissertation. Combining an image segmentation model with SpatioTemporal Asset Catalogs, we generate iceberg distributions from four fjord …
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The Environmental Sensitivity of Cold-water Corals Lophelia pertusa
… sensitivity to oil and gas activities. Underwater videos from industry platform surveys were examined to identify L. pertusa, detail its occurrence at two sites (Heather and North Alwyn A (NAA)), and to look for evidence of exposure to drilling muds and cuttings (discharges). In addition, …
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Development of biomarker-based proxy methods for reconstructing the late Quaternary sea ice history in the Barents Sea
… rapid ice retreat as a consequence of increased Atlantic Water (AW) and reduced meltwater surges. At the northern margin, conditions during the subsequent Younger Dryas stadial were significantly ameliorated relative to the western Barents Sea at this time, possibly indicating the absence of a …
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A study of the large scale circulation and water mass formation in the Nordic seas and Arctic Ocean
In this thesis, production of dense water that feeds the dense overflows across the Greenland-Scotland Ridge has been considered. A new circulation scheme is developed which is consistent with the water masses, currents and air-sea fluxes in the region, and with the important observation that the …
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Studies of deep-sea sedimentary microtopography in the North Atlantic Ocean
… Outer Ridge (western North Atiantic, water depth greater than 4000 m) and in the Rockall Trough (northeastern North Atlantic, water depth greater than 2000 m) have been formed as bed forms of deep currents. These bed forms, all developed in cohesive sediments, include current ripples …
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Radiocarbon (Δ14C) and Stable Carbon (δ13C) Isotopic Composition of Dissolved Inorganic Carbon (DIC) in Baffin Bay
… exchange of CO2 and the buffering capacity of seawater allows the oceans to store significant amounts of dissolved inorganic carbon (DIC; ~38,000 GtC). The Arctic Ocean is currently warming at double the rate of the rest of the planet, yet the effect of climate change on the Arctic marine carbon …
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Changes in shelf waters due to air-sea fluxes and their influence on the Arctic Ocean circulation as simulated in the OCCAM global ocean model
… ice formation play an important role in dense water formation. In the model these dense waters are transported by a circumpolar boundary current into the deep convection sites of the North Atlantic Ocean. The boundary current is thought to be a continuous feature in the real ocean, however the …
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An investigation of metal contaminants in sediments of Arctic Svalbard: Inferences for sources and transport pathways
… BASICC 40), along with cores taken from a freshwater lake (ICOS1), an anoxic lagoon (ICNL1), and the Vøring plateau (VP2a), show a clear increase in Pb concentration in modern sediments, corresponding with a decrease in the 206Pb/207Pb isotope ratio. This pattern signifies a change in the source …
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Late glacial and Holocene marine geology, palaeoceanography and palaeoecology of the Northern Isles of Scotland
… debris flows. No evidence of shallow water foraminiferal species is found in the deposits, likely due to high early Holocene sedimentation rates, or the lack of gradient between species found in shallow coastal waters and at the core site. Cool water species (which are indicative of …
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The structure and transport of the Brazil Current between 27⁰ and 26⁰ South
… shear is found only in the upper portion of the water column, over the continental slope. Downstream, the current moves off the slope into deeper water and develops top-to-bottom, monotonic shear. To obtain velocity from the shear profiles, zero velocity surfaces are chosen based on conservative …