Extratropical control of tropical climate, the atmospheric bridge and oceanic tunnel

Details Extratropical control of tropical climate, the atmospheric bridge and oceanic tunnel Extratropical control of tropical climate, the atmospheric bridge and oceanic tunnel

Mar 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30e..34l&link_type=abstract

Geophysical Research Letters, Volume 30, Issue 5, pp. 34-1, CiteID 1230, DOI 10.1029/2002GL016492

Physics

18

Global Change: Oceans (4203), Global Change: Climate Dynamics (3309), Global Change: Atmosphere (0315, 0325)

Scientific paper

A coupled ocean-atmosphere model study shows that the extratropical impact on tropical climate is as strong as the tropical impact on extratropical climate. A 2°C SST warming in the global extratropics increases equatorial ocean temperature by ~1°C in the surface and subsurface. The surface temperature change is caused by the atmospheric bridge of the Hadley circulation (70%) and the oceanic tunnel of thermocline subduction (30%), while the subsurface temperature change is forced predominantly through the oceanic tunnel. Furthermore, the dominant influence on the equator comes from the southern hemisphere atmosphere and ocean.

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