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Showing 1 to 20 of 101 for “"Water masses"”.
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Variability of water masses and circulation in the subtropical North Atlantic
Observations of interannual variability in 18 Water (Talley and Raymer 1982) and Gulf Stream transport (Worthington 1977) motivate an ocean model sensitivity study. The North Atlantic circulation is simulated with a three-dimensional isopycnic coordinate GCM. Idealized anomalous buoyancy-forcing …
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Analysis of water masses distribution and circulation in the White Sea, Russia
… and biogeochernical processes in coastal waters of the Russian Arctic" and of a number of Russian national and EU research projects. The study focuses on the formation, evolution and spatial distribution of fine-scale thennohaline structures. The mixing processes were thoroughly studied in …
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A fine-scale volumetric census of the water masses of the Agulhas retroflection area
Two studies of the quantification of water masses around southern Africa are described in this thesis. The first, a pilot study, is concerned with the volumetric analysis of historic hydrographic data from the region off the South African west coast. It uses data that have been collected with …
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Glacial-interglacial variations of the water masses in the southeast Atlantic Ocean derived from foraminiferal neodymium isotope ratios
… (LGM), the transport of North Atlantic Deep Water (NADW) to the southeast Atlantic Ocean was reduced. A popular method to trace these ambient changes is the stable isotope systematics of neodymium (given as εNd). In this study εNd data were measured on mixed planktic and bulk foraminifera …
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Investigating the circulation of Southern Ocean deep water masses over the last 1.5 million years by geochemical fingerprinting of marine sediments
… as well as an important region of upwelling and water mass formation, it is thought to have played a key role in modulating Earth’s past climate. Changes in the circulation of SO deep and bottom waters over the last 1.5 million years are investigated using stable carbon isotope $δ^{13}C$ …
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Geochemically tracing the intermediate and surface waters in the Tasman Sea, southwest Pacific
The relatively understudied intermediate waters of the world have been implicated as an important part of the global ocean circulation. This thesis discusses the intermediate waters of the Pacific over space and time. Initially, by using geochemical tracers to look at the present distribution, …
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Geochemically tracing the intermediate and surface waters in the Tasman Sea, southwest Pacific
The relatively understudied intermediate waters of the world have been implicated as an important part of the global ocean circulation. This thesis discusses the intermediate waters of the Pacific over space and time. Initially, by using geochemical tracers to look at the present distribution, …
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Influence of Natural and Anthropogenic Environmental Variability on Larval Fish Diet, Growth, and Condition in the Northcentral Gulf of Mexico
… Gulf of Mexico experiences high levels of freshwater runoff annually from various sources including the Mississippi River and Mobile Bay, among other sources. Early life history stages of fishes are especially vulnerable to environmental variability created by freshwater discharge. The …
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Temporal variability and vertical structure in larval abundance : the potential roles of biological and physical processes
… scales, larvae were associated with particular water masses, defined by temperature-salinity characteristics. Within a particular water mass, group-specific vertical patterns were observed over both long and short time scales. "Low frequency" temporal variations resulted primarily from …
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Concentrations, Distributions and Chemical Speciation of Zinc and Cadmium in the Equatorial and South Atlantic Ocean
… carbon uptake (Morel and Price, 2003). In seawater the total dissolved concentration of a metal (MTD) is distributed among different chemical species and this chemical speciation dictates a metal's bioavailability. Strong organic metal-binding ligands greatly affect the metal's chemical …
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The holocene ostracods of the Agulhas Bank, South Africa : their classification, distribution and ecology
… well as an oceanographic analysis of the bottom water on the Agulhas Bank, has provided environmental parameters for each sediment sample location, enabling relationships to be described between ostracod faunas and environmental conditions. Quantitative factor analysis has been carried out on the …
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Central North Atlantic (IODP Site U1313) paleoceanography based on a high-resolution dinoflagellate cyst record across the Early–Middle Pleistocene boundary (Marine Isotope Stages 20–18, ~810–741 ka)
… [NAC]), Nematosphaeropsis labyrinthus (sub-polar water masses), total Impagidinium spp. (subtropical gyre), and total protoperidiniacean cysts and total cyst concentrations (productivity indicators). Cooling just prior to Termination IX suggests a Younger-Dryas type event. An early arrival of the …
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Estudo de uma coleção de Siphonophora calycophorae da região norte-nordeste do Brasil
… was correlated to the depht and the existing water masses in the area. By means of the hydrological data collected, it has been verífied the existence of the most atundant and frequent species in each water mess.
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Modelling the oceanic circulation in the Delagoa Bight
… The model is also able to reproduce the main water masses and their sources in the region. Water masses found in the centre of the Bight enter through the northeastern sector, either by intrusion of pulses or instabilities of the southwards flowing current. When the DBLE is well established, …
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The physical oceanographic processes on the southeast African shelf and slope
… of temperature and salinity within the upper water masses but not within the deeper water masses. The same five water masses, Tropical Surface Water (TSW), Subtropical Surface Water (STSW), South Indian Central Water (SICW), Red Sea Water (RSW) as well as Antarctic Intermediate Water (AAIW), …
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Deep ocean hydrographical variability and circulation in the north-west Iberia
… gyre has been monitored since 2003 for the whole water column (>5000 m) by three sections extending zonally 200 nautical miles (nm) westwards of Cape Finisterre (43°N, western Iberia margin), and meridionally 100 nm off Cape Ortegal (8°W, southwestern Bay of Biscay) and 100 nm off Santander …
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A description of the hydrography between Cape Town and Antarctica along the GoodHope Transect between 2004-2012
… of several branches, separate zones of distinct water masses, thus identifying the location of the fronts and understanding their dynamics is of global importance. The GoodHope programme, is a repeat annual transect between South Africa and Antarctica, monitoring the exchanges within the …
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Palynology and foraminiferal geochemistry of the Lower Pleistocene Olduvai Subchron (ca. 1.8 Ma) in DSDP Hole 603C, western North Atlantic
… to reflect fluctuating temperate to subtropical water masses. These assemblages comprise both neritic and oceanic species, and are marked by a transition upsection from warm conditions, dominated by Lingulodinium machaerophorum, Polysphaeridium zoharyi and Cymatiosphaera? invaginata, to cooler …
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The dynamics and physical processes of the Comoros Basin
… nature of the eddy variability in the basin.The water masses in the Comoros Basin emulate those found further south in the Mozambique Channel. The presence of AAIW north of Madagascar confirmed that this water mass enters the Comoros Basin from the east while the presence of North Atlantic Deep …
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Patterns in the Variation of CDOM Spectral Slopes in the Western Lake Erie Basin
… matter (CDOM), which is a component of the water, absorbs light strongly in the ultraviolet to blue wavelengths, which overlaps a strong absorption area of the spectrum for the chlorophyll a in algae. Measurements in these wavelengths are essential for remote quantification of chlorophyll a …
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