Physics
Scientific paper
May 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.1333a&link_type=abstract
Geophysical Research Letters, Volume 26, Issue 9, p. 1333-1336
Physics
3
Meteorology And Atmospheric Dynamics: Middle Atmosphere Dynamics, Global Change: Climate Dynamics, Oceanography: General: Upwelling And Convergences
Scientific paper
Reconstructed climatic changes during the Younger Dryas interval are similar to, but somewhat larger and more widespread than, those expected based on the direct atmospheric effects of reduced North Atlantic oceanic heat transport. The paleoclimatic data show that North Atlantic cooling during the Younger Dryas was accompanied by stronger winds in many regions, suggesting that enhanced wind-driven ocean upwelling may have served as a positive feedback on the cooling. We test this hypothesis using the GENESIS atmospheric general circulation model, and find that Younger Dryas-age specified reduction in North Atlantic oceanic heat transport increases tropical Ekman divergence by ~10% in regions and at times of prominent up-welling, sufficient to affect tropical temperatures.
Ágústsdóttir Anna María
Alley Richard B.
Peterson William H.
Pollard David
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