Remotely induced warming of Antarctic Bottom Water in the eastern Weddell gyre

Four repeat hydrographic sections across the eastern Weddell gyre at 30°E reveal a warming (by ~0.1°C) and lightening (by ~0.02–0.03 kg m−3) of the Antarctic Bottom Water (AABW) entering the gyre from the Indian sector of the Southern Ocean between the mid-1990s and late 2000s. Historical hydrographic and altimetric measurements in the region suggest that the most likely explanation for the change is increased entrainment of warmer mid-depth Circumpolar Deep Water by cascading shelf water plumes close to Cape Darnley, where the Indian-sourced AABW entering the Weddell gyre from the east is ventilated. This change in entrainment is associated with a concurrent southward shift of the Antarctic Circumpolar Current's (ACC) southern boundary in the region. This mechanism of AABW warming may affect wherever the ACC flows close to Antarctica.

Details

Author(s):
Authors: Couldrey, Matthew P., Jullion, Loic, Naveira Garabato, Alberto C., Rye, Craig, Herraiz-Borreguero, Laura, Brown, Peter J., Meredith, Michael P., Speer, Kevin L.

On this site: Michael Meredith
Date:
1 June, 2013
Journal/Source:
Geophysical Research Letters / 40
Page(s):
2755-2760
Digital Object Identifier (DOI):
https://doi.org/10.1002/grl.50526