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Abyssal ocean warming around Antarctica strengthens the Atlantic overturning circulation
Author(s) -
Patara Lavinia,
Böning Claus W.
Publication year - 2014
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2014gl059923
Subject(s) - antarctic bottom water , abyssal zone , shutdown of thermohaline circulation , oceanography , north atlantic deep water , geology , thermohaline circulation , climatology , effects of global warming on oceans , ocean current , circumpolar deep water , global warming , climate change
The abyssal warming around Antarctica is one of the most prominent multidecadal signals of change in the global ocean. Here we investigate its dynamical impacts on the Atlantic Meridional Overturning Circulation (AMOC) by performing a set of experiments with the ocean‐sea ice model NEMO‐LIM2 at ½° horizontal resolution. The simulations suggest that the ongoing warming of Antarctic Bottom Water (AABW), already affecting much of the Southern Hemisphere with a rate of up to 0.05°C decade −1 , has important implications for the large‐scale meridional overturning circulation in the Atlantic Ocean. While the abyssal northward flow of AABW is weakening, we find the upper AMOC cell to progressively strengthen by 5–10% in response to deep density changes in the South Atlantic. The simulations suggest that the AABW‐induced strengthening of the AMOC is already extending into the subtropical North Atlantic, implying that the process may counteract the projected decrease of the AMOC in the next decades.