The impact of variable sea-surface temperature on the circulation and thermal structure of the middle and upper atmosphere

Details The impact of variable sea-surface temperature on the circulation and thermal structure of the middle and upper atmosphere The impact of variable sea-surface temperature on the circulation and thermal structure of the middle and upper atmosphere

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsa51b..07s&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SA51B-07

Physics

0355 Thermosphere: Composition And Chemistry, 3210 Modeling

Scientific paper

The Whole Atmosphere Community Climate Model (WACCM) is an upward extension of the National Center for Atmospheric Research's Community Climate System Model. Comparison with observations indicates that WACCM produces realistic temperature and zonal wind distributions from the troposphere through the lower thermosphere. A baseline simulation is presented where the model is run with a fixed annual cycle of Sea Surface Temperature (SST). The mean climate and internal variability of that simulation are described, and serve as a basis of comparisons for additional runs where the SST is varied according to observations for the period 1979-1998. The variable SST simulation indicates that changes in the distribution of tropical latent heat release that accompany changes in SST have a significant impact on the model circulation. In the troposphere, familiar features of the response to warm ENSO events, such as the Pacific-North American pattern, are obtained. In the stratosphere, winters corresponding to the warm ENSO phase are more disturbed than those in the cold phase. A characteristic pattern of zonal mean temperature variability in the stratosphere accompanies these changes in planetary wave activity, such that warm ENSO years are associated with warmer temperatures in the lower stratosphere and colder temperatures in the upper stratosphere. Thermal variability associated with ENSO is also detected near the summer mesopause, whose temperature is significantly warmer during warm ENSO events.

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