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Showing 1 to 14 of 14 for “"Antarctic Bottom Water"”.
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Changes in Antarctic Bottom Water Formation During Interglacial Periods
… 5, there are observations that point to reduced Antarctic Bottom Water (AABW) formation. These reductions are believed to be driven by an increase in the strength of the Southern Ocean density stratification due to surface water freshening. Any reduction in AABW formation has important …
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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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Diapycnal advection by double diffusion and turbulence in the ocean
… plays an important role in the mass budget of Antarctic Bottom Water.
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Diapycnal advection by double diffusion and turbulence in the ocean
… plays an important role in the mass budget of Antarctic Bottom Water.
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Cross-shelf exchange driven by dense flow down a canyon
… a prograde sloping canyon induced by dense shelf water descending into the canyon. This thesis is motivated by the dispersal of dense water generated by polynyas on the Arctic and Antarctic continental shelves. Laboratory results corroborate prior numerical results suggesting that canyons are …
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Cross-Shelf Exchange Driven by Dense Flow Down a Canyon
… a prograde sloping canyon induced by dense shelf water descending into the canyon. This thesis is motivated by the dispersal of dense water generated by polynyas on the Arctic and Antarctic continental shelves. Laboratory results corroborate prior numerical results suggesting that canyons are …
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Ocean circulation and carbon cycle dynamics in the Pacific Southern Ocean during Late Pleistocene interglacials
… global ocean overturning circulation, enabling water mass exchange between ocean basins, driving Antarctic Bottom Water and Antarctic Intermediate Water formation and providing the major return path of Circumpolar Deep Water (CDW) to the ocean surface. The Pacific Ocean is the largest aquatic …
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What do paleo-geochemical tracers tell us about the deep ocean circulation during the last ice age?
… of nutrient-depleted Lower North Atlantic Deep Water (Lower NADW) allowed nutrient-rich Antarctic Bottom Water (AABW) to push further north during the Last Glacial Maximum (LGM) (Boyle and Keigwin, 1982; 1987; Duplessy et al., 1988). The evidence for this interpretation is re-examined in this …
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The Evolution and Impact of Weddell Sea Deep Water
The interaction between the Antarctic Ice Sheet and the Southern Ocean is of major importance for changes in Earth’s climate. The Antarctic Ice Sheet is largely marine based and grounded below sea level, which makes it especially vulnerable for sea-level forcing and ocean warming. In turn, the …
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Multi-decadal Dynamics of Southern Ocean Open-Ocean Polynyas and Deep Convection: Insights from Climate Models
… global climate through its influence on water mass formation, sea ice, and the large-scale overturning circulation. However, its variability, underlying mechanisms, and global impacts remain incompletely understood, particularly on multi-decadal to centennial timescales. This thesis …
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Modeling the Seasonal Sea Ice Cycle in the Ross Sea, Antarctica
… and transformations of continental shelf water masses, and bottom water formation. Daily atmospheric forcing is from the ECMWF ERA-40 dataset, and for a separate simulation, wind forcing for Terra Nova Bay is substituted from daily automatic weather station (AWS) data. Simulated Ross Sea …
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High-latitude sedimentation in response to climate variability during the Cenozoic
… significantly impacted the expansion of the West Antarctic Ice Sheet, sea ice/polynya formation, and, notably, the genesis of Antarctic Bottom Water (AABW), a crucial component of the global thermohaline circulation. In Chapter 1, we propose that turbidite currents, arising from the formation of …
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A survey of anticyclonic mesoscale eddies, within the Southern Ocean, and their propagation south from the South West Indian Ridge
… act as vehicles, transporting smaller bodies of water, with certain oceanographic characteristics, from one place to another within a larger body of water. The South West Indian Ridge [SWIR] is a topographically complex bathymetric feature which amplifies the production of mesoscale eddies in and …
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Southern Ocean Centennial Oscillations in the CMIP6 Ensemble
… and ocean interior, as well as the formation of water masses. In climate models, centennial-scale oscillations have been noted in key Southern Ocean properties such as the strength of the Antarctic Circumpolar Current, meridional overturning circulations, and deep ocean heat content, even in the …