Physics
Scientific paper
Aug 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3415604s&link_type=abstract
Geophysical Research Letters, Volume 34, Issue 15, CiteID L15604
Physics
17
Global Change: Abrupt/Rapid Climate Change (4901, 8408), Global Change: Climate Variability (1635, 3305, 3309, 4215, 4513), Oceanography: Physical: General Circulation (1218, 1222)
Scientific paper
The traditional view is that widespread discharge of freshwater into the North Atlantic leads to a reduction of the Atlantic Meridional Overturning Circulation (AMOC), a concomitant reduction of poleward heat transport and a cooling of the climate of the North Atlantic. Here we report upon coupled atmosphere-ocean general circulation model experiments that suggest a more non-uniform response of the North Atlantic climate to large freshwater perturbations. We show that in a cold climate with extensive sea ice coverage in the Labrador Sea, a massive discharge of freshwater along coastal boundaries leads to an anomalous warming in the western North Atlantic. The warming persist despite a significant weakening of the AMOC and its associated heat transport. It is maintained by major reorganizations of the large-scale wind field, oceanic circulation and convection in the subpolar Atlantic.
Flato Gregory M.
Robitaille Daniel Y.
Saenko Oleg A.
Weaver Andrew J.
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