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Showing 1 to 20 of 50 for “"Antarctic Circumpolar Current"”.
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Modeling diffusion in the Antarctic circumpolar current
In order to understand the role of eddies in lateral mixing in a rotating fluid, a small scale laboratory model is constructed. An experiment is carried out in a rotating, differentially heated annulus and the evolution of a dye tracer mixed by turbulent motions is studied. Images are analyzed to …
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A study of the variation of the Antarctic Circumpolar Current during a one year period,
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Meteorology, 1968.
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Dynamics of the Antarctic circumpolar current : evidence for topographic effects from altimeter data and numerical model output
… to examine the circulation and dynamics of the Antarctic Circumpolar Current (ACC). The mean sea surface height across the ACC has been reconstructed from height variability measured by the Geosat altimeter, without assuming prior knowledge of the geoid. For this study, an automated technique …
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Dynamics of the Antarctic circumpolar current : evidence for topographic effects from altimeter data and numerical model output
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1995.
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The upper ocean structure of the Antarctic circumpolar current in the vicinity of the South-West Indian ridge
… dynamics and the structural modification of the Antarctic Circumpolar Current (ACC) when it encounters the complex SWIR. High sea surface variability has been observed at the southwest Indian sector of the Southern Ocean, specifically at and around 50°S;30°E. As the strong eastward flowing ACC …
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Dynamics of global ocean heat transport variability
… cycle. The majority of it is due to wind-induced current fluctuations in which the time-varying wind drives Ekman layer mass transports that are compensated by depth-independent return flows. The temperature difference between the mass transports gives rise to the time-dependent heat transport. …
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Dynamics of global ocean heat transport variability
… cycle. The majority of it is due to wind-induced current fluctuations in which the time-varying wind drives Ekman layer mass transports that are compensated by depth-independent return flows. The temperature difference between the mass transports gives rise to the time-dependent heat transport. …
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Phytoplankton community structure, productivity and nitrogen metabolism as a function of light availability in the Atlantic sector of the southern Ocean by Erika Anne Kean.
… 2008/2009. Four transects from Cape Town to Antarctica, Antarctica to South Georgia Island and the return reciprocal legs surveyed the following regions, the Subtropical zone (STZ) north of the Subtropical Front (STF), the Northern Antarctic Circumpolar Current zone (N-ACC) from the STF to …
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Variability of zooplankton and sea surface temperature in the Southern Ocean
… of spatial patterns in the distribution of Antarctic krill (Euphausia superba) resulting from social behavior. Turbulence of the flow is found to provide favorable conditions for the evolution social behavior in an idealized biological-physical model. Second, I analyze observations of sea …
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Slope/shelf circulation and cross-slope/shelf transport out of a bay driven by eddies from the open ocean
Interaction between the Antarctic Circumpolar Current and the continental slope/shelf in the Marguerite Bay and west Antarctic Peninsula is examined as interaction between a wind-driven channel flow and a zonally uniform slope with a bay-shaped shelf to the south. Two control mechanisms, eddy …
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The biogeochemistry and residual mean circulation of the southern ocean
… role in the dynamical and tracer balances in the Antarctic Circumpolar Current, and the transport of tracers is driven by the residual mean circulation which is the net effect of the Eulerian mean circulation and the eddy-induced circulation. Using an idealized, zonally averaged model of the ACC, …
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Western South Atlantic holocene and glacial deepwater hydrography derived from benthic foraminiferal Cd/Ca and stable carbon isotope data
… are exported through the western South Atlantic. Antarctic intermediate water AAJW also enters the Atlantic in this region. Circumpolar deep water (CDW) fills the depths below AAIW and above and below northern source waters. A depth transect of cores from 1567-3909 m water depth in the western …
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Western South Atlantic holocene and glacial deepwater hydrography derived from benthic foraminiferal Cd/Ca and stable carbon isotope data
… are exported through the western South Atlantic. Antarctic intermediate water (AAIW) also enters the Atlantic in this region. Circumpolar deep water (CDW) fills the depths below AAIW and above and below northern source waters. A depth transect of cores from 1567-3909 m water depth in the western …
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Mechanisms for enhanced turbulence in the Drake Passage region of the Southern Ocean
… due to intense winds and storm forcing, strong currents in the form of the Antarctic Circumpolar Current (ACC) interacting with steep topography, and enhanced mesoscale activity. Consequently, the Southern Ocean is believed to be a hotspot for enhanced oceanic mixing. Due to the remote location …
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Antarctic climate: ocean fluxes and variability
… and the balance of fluxes around the<br/>Antarctic Circumpolar current.<br/><br/>A historical data set in the region of Drake Passage is examined to study the large-scale<br/>water mass variability between 1926-2005. The water mass properties of the Lower<br/>Circumpolar Deep Water is …
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The biotic effects of tertiary geoclimatic change in the southern hemisphere
… Passage and the subsequent formation of the Antarctic Circumpolar Current; the Great Escarpment; Australia’s vast arid zone) and increased rates of diversification, ecological shifts into novel niches, and morphological evolution. I discovered high levels of unexpected cryptic diversity …
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Antarctic Bottom Water in CMIP5 models : characteristics, formation, evolution
Observations 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 …
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A study of diapycnal mixing in the Southern Ocean using a tracer release experiment and numerical models
… are used to advect and diffuse a tracer in the Antarctic Circumpolar Current, beginning in the Southeast Pacific and progressing through Drake Passage, and model outputs are then compared with observations from the DIMES tracer. The prescribed diapycnal diffusivity fields within the models are …
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Mechanisms for enhanced turbulence in the Drake Passage Region of the Southern Ocean
… due to intense winds and storm forcing, strong currents in the form of the Antarctic Circumpolar Current (ACC) interacting with steep topography, and enhanced mesoscale activity. Consequently, the Southern Ocean is believed to be a hotspot for enhanced oceanic mixing. Due to the remote location …
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