Mathematics – Logic
Scientific paper
Nov 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002georl..29u..35h&link_type=abstract
Geophysical Research Letters, Volume 29, Issue 21, pp. 35-1, CiteID 2039, DOI 10.1029/2002GL014872
Mathematics
Logic
20
Global Change: Climate Dynamics (3309), Meteorology And Atmospheric Dynamics: Ocean/Atmosphere Interactions (0312, 4504), Oceanography: Physical: Air/Sea Interactions (0312), Oceanography: Physical: El Nino, Oceanography: Physical: Upper Ocean Processes
Scientific paper
A CGCM is used to study the relative roles played by local air-sea interaction and remote ENSO effects on the tropical Atlantic interannual variability. A regional coupling strategy allows full air-sea coupling only over the Atlantic Ocean north of 30°S. Two experiments were conducted, respectively with either climatological or real time boundary conditions prescribed over the uncoupled portion of the global domain. The simulations show that major anomalous SST modes in the tropical South Atlantic are mainly caused by coupled ocean-atmosphere processes within the Atlantic sector. SST anomalies in the northern tropical ocean, however, are substantially affected by the Pacific ENSO, with local coupling accounting for an enhanced effect. The El Niño effect causes warmer SST in the northern tropical Atlantic in the boreal spring season, forced by weakened northeast trade winds over the Atlantic basin starting from boreal winter in the maturing El Niño phase. The warmer SST anomalies then trigger a positive air-sea feedback within the Atlantic basin, which leads to stronger anomalous cross-equatorial atmospheric flow in the spring season.
Huang Bohua
Pan Ziqin
Schopf Paul S.
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