Physics
Scientific paper
Aug 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000georl..27.2577c&link_type=abstract
Geophysical Research Letters, Volume 27, Issue 16, p. 2577-2580
Physics
15
Global Change, Global Change: Climate Dynamics, Meteorology And Atmospheric Dynamics: Climatology, Oceanography: Physical: General Circulation
Scientific paper
The observed warming trend in recent decades has had an El Niño-like character, but the cause of this pattern has been a contentious issue. Here we report results from the CSIRO climate model forced by historical and projected future increases in greenhouse-gas concentrations. These show a warming pattern that initially has the largest warming in the extratropics with a weak La Niña-like pattern in the tropics, but is eventually (after the 1960s) El Niño-like. This behavior is present in each of an ensemble of three simulations. The switch in warming pattern is driven by the extratropical warmed water that subducts and penetrates through the subtropics and into the tropics, where it upwells and initiates the change. This result strengthens the argument, in terms of a physical mechanism, that the recent observed El Niño-like warming trend may be at least in part greenhouse-induced.
Cai Wenju
Whetton Peter H.
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