Couldrey, M. P. and Jullion, L. and Naveira Garabato, A. C. and Rye, C. and Herr\?aiz-Borreguero, L. and Brown, P. J. and Meredith, M. P. and Speer, K. L.
abstract: Four repeat hydrographic sections across the eastern Weddell gyre at 30^\circE reveal a warming (by ~0.1^\circC) 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.
@article{Couldrey-etal-2013,
author = {Couldrey, M. P. and Jullion, L. and Naveira~Garabato, A. C. and Rye, C. and Herr\?{a}iz-Borreguero, L. and Brown, P. J. and Meredith, M. P. and Speer, K. L.},
title = {Remotely induced warming of Antarctic Bottom Water in the eastern Weddell gyre},
journal = {Geophys. Res. Lett.},
year = {2013},
pages = {2755--2760},
volume = {40},
issue = {11},
doi = {10.1002/grl.50526},
url = {https://eprints.soton.ac.uk/355047/}
}
