题目：

Downward wave coupling between the stratosphere and troposphere in the Southern Hemisphere and the impact of ozone changes

报告人:Dr. Judith Perlwitz

单位:University of Colorado and NOAA Earth System Research Laboratory 

地点：科研楼303会议室

时间： 2010年11月16号（周二）10:00

摘要:

We investigate downward wave coupling between the stratosphere and troposphere in the Southern Hemisphere in reanalysis data and in the Goddard Earth Observing System chemistry-climate model (GEOS CCM) Version I. Downward wave coupling occurs when planetary waves reflected in the stratosphere impact the troposphere and is distinct from zonal-mean coupling, which results from wave dissipation and its subsequent impact on the zonal-mean flow.
We show that wave coupling dominates downward coupling between the stratosphere and troposphere during spring.  It is found that downward wave-1 coupling from September to December has increased over the last three decades owing to significant increases at the beginning and end of this four-month period.  An analysis of GEOS CCM simulations
suggests that the observed increase in downward wave coupling during late spring and early summer is caused by ozone depletion. The results point to a new mechanisms by which stratospheric ozone changes can affect tropospheric climate.