Physics
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3518709c&link_type=abstract
Geophysical Research Letters, Volume 35, Issue 18, CiteID L18709
Physics
5
Atmospheric Processes: General Circulation (1223), Atmospheric Processes: Global Climate Models (1626, 4928), Atmospheric Processes: Tropical Meteorology
Scientific paper
Recent theoretical and observational work shows that the Reynolds stresses due to large-scale extratropical eddies play a key role in determining Hadley cell strength. This implies that errors in the representation of extratropical eddies in climate models could force a bias in the tropical circulation. Here, this hypothesis is assessed using output from 17 coupled climate models, focusing on Northern Hemisphere winter. Inter-model variability in Hadley cell strength, tropical temperature and tropical humidity is found to be significantly correlated with inter-model differences in stationary eddy stress. Thus, a significant fraction of the tropical climate bias found in current climate models may be forced from the extratropics.
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