The Stratosphere in General Circulation Models
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A simple discussion of the processes which maintain the mean state of the stratosphere is given in order to demonstrate how the stratosphere might influence the tropospheric circulation. A series of GCM studies which indicate that the strength of the polar night jet is important in determining the planetary wave structures in the troposphere are then summarized. These experiments are used to determine the tropospheric response to stratospheric changes during northern winter, when the largest influence is expected. The climatological response and the time scale on which the response develops has been determined using separate experiments. Finally, problems with the physical parameterizations which are typically encountered when extending tropospheric GCMs to include the full stratosphere and lower mesosphere are summarized.
KeywordsGravity Wave Zonal Wind Planetary Wave Lower Stratosphere Meridional Plane
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