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Showing 1 to 20 of 30 for “"North Atlantic Deep Water"”.
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The role of North Atlantic Deep Water formation in the thermohaline circulation
… the global ocean thermohaline circulation. North Atlantic Deep Water formation is an important component of this system and the role of this process in the ventilation, structure and variability of all the world ocean basins is studied. The production of deep water in the north Atlantic …
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The distribution of dissolved silica in the deep western North Atlantic Ocean
The distribution of dissolved silica in the deep western North Atlantic Ocean is presented. The potential temperature-dissolved silica relationship is compared with the potential temperature salinity relationship in the North Atlantic Deep Water. Geographical variations in the potential …
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Submesoscale coherent vortices in the deep Brazil Basin
… Lagrangian and hydrographic data taken in the deep Brazil Basin, we identify several submesoscale coherent vortices (SCVs). These features contrast with SCV paradigms in that float data indicate approximately equal populations of cyclonic and anticyclonic vortices, and hydrographic data suggest …
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Submesoscale coherent vortices in the deep Brazil Basin
… Lagrangian and hydrographic data taken in the deep Brazil Basin, we identify several submesoscale coherent vortices (SCVs). These features contrast with SCV paradigms in that float data indicate approximately equal populations of cyclonic and anticyclonic vortices, and hydrographic data suggest …
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Hydrographic structure of overflow water passing through the Denmark Strait
Denmark Strait Overflow Water (DSOW) constitutes the densest portion of North Atlantic Deep Water, which feeds the lower limb of the Atlantic Meridional Overturning Circulation (AMOC). As such, it is critical to understand how DSOW is transferred from the upstream basins in the Nordic Seas, across …
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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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Hydrographic structure of overflow water passing through the Denmark Strait
Denmark Strait Overflow Water (DSOW) constitutes the densest portion of North Atlantic Deep Water, which feeds the lower limb of the Atlantic Meridional Overturning Circulation (AMOC). As such, it is critical to understand how DSOW is transferred from the upstream basins in the Nordic Seas, across …
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What do paleo-geochemical tracers tell us about the deep ocean circulation during the last ice age?
… such as carbon 13 and cadmium show that the deep Atlantic was enriched in nutrients during the Last Ice Age. The conventionally accepted interpretation of these higher nutrient levels is that a reduction of the rate of formation of nutrient-depleted Lower North Atlantic Deep Water (Lower …
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Antarctic Bottom Water in CMIP5 models : characteristics, formation, evolution
… suggest that the properties of Antarctic Bottom Water (AABW) are changing, causing significant steric sea level rise. Understanding the causes of these changes is critical for projections of future sea level, yet previous generations of climate models failed to represent AABW accurately. …
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Cold air outbreaks over the Gulf Stream and implications for the North Atlantic Ocean
During Cold Air Outbreak (CAO) events over North America during winter, cold dry air is often advected over the ocean offshore of the East Coast. A motivating hypothesis of this study is that the air-sea fluxes associated with CAO events will be manifested in offshore ocean variations that will be …
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Glacial-interglacial variations of the water masses in the southeast Atlantic Ocean derived from foraminiferal neodymium isotope ratios
… the Last Glacial Maximum (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 …
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Constraining variability of the Atlantic Meridional Overturning Circulation at 25N from historical observations, 1980 to 2005
The Atlantic Meridional Overturning Circulation (MOC) plays an important role in<br/>maintaining western Europe’s moderate climate. Although expected to weaken under<br/>increasing greenhouse gas concentrations, the magnitude of the response remains<br/>uncertain. Monitoring of the Atlantic MOC …
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Anomalous carbonate preservation in the abyssal North Pacific, ODP sites 882 and 1179: planktonic foraminiferal analysis, climate change and palaeogeomagnetism /
… study were obtained from the abyssal western North Pacific Ocean at Ocean Drilling Project Sites 882 (50°21.797'N, 167°35.999^E) and 1179 (41°4.787^N, 159°58.786'E). Despite their depth below the present day calcite compensation depth, ~250m and ~ 1.5km respectively, these late …
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Where three oceans meet : the Algulhas retroflection region
… lies at the junction of the South Indian, South Atlantic, and Circumpolar Oceans. A new survey of the Agulhas Retroflection taken in March 1985, plus historical hydrographic data, allow its dynamical and water-mass characteristics, and its role in exchanging mass, tracers, and vorticity between …
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Zinc and cadmium in benthic foraminifera as tracers of ocean paleochemistry
… ratios from the Bahama Banks indicate that the North Atlantic subtropical gyre was greatly depleted in nutrients during the last glacial maximum (LGM). A high-resolution Cd/Ca record from 965 m water depth suggests that Glacial North Atlantic Intermediate Water formation was strong during the …
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Zinc and cadmium in benthic foraminifera as tracers of ocean paleochemistry
… ratios from the Bahama Banks indicate that the North Atlantic subtropical gyre was greatly depleted in nutrients during the last glacial maximum (LGM). A high-resolution Cd/Ca record from 965 m water depth suggests that Glacial North Atlantic Intermediate Water formation was strong during the …
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The southern termination of the East Madagascar current
… The EMC is shown to consist of Tropical Surface Water, Subtropical Surface Water and South Indian Central Water. In the region of the EMC Antarctic Intermediate Water, North Indian Deep Water and North Atlantic Deep Water/Circumpolar Deep Water were found. There is clear evidence of the presence …
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Meltwater injections and their impact on Atlantic meridional overturning circulation and climate during the time period of Heinrich Event 1 and the last deglaciation
The temporal relationship between meltwater pulse 1a (mwp-1a) and the climate<br/>history of the last deglaciation remains a subject of debate. By combining the<br/>GRIP ?18O ice core record on the new Greenland Ice Core Chronology 2005<br/>(GICC05) timescale with the U/Th-dated Barbados coral …
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Neogene to quaternary foraminifera from the western margin of southern Africa
… cores from the Namibian shelf (199 to 309 m water depth) and three cores from the western slope (874 to 3631 m water depth) of South Africa were studied to determine the middle Miocene to Quaternary stratigraphy, palaeoenvironment and palaeoceanography of the western margin of southern …
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Marine cycling of neodymium in the South Atlantic and the Southern Oceans
… both modern and palaeo-ocean circulation of the deep ocean which is an important factor controlling the climate. Although there has been widespread utilisation of Nd isotopes as a proxy, the marine cycling of Nd is not fully understood. This thesis investigates the cycling of neodymium, together …
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