ESRL/PSD Seminar Series

The Impact of Tropical Indian Ocean Warming on Southern Hemisphere Polar Climate

Judith Perlwitz, ESRL/PSD and CIRES, University of Colorado


The impact of two distinct anthropogenic forcings on the Southern Hemisphere's (SH) polar climate is investigated using idealized climate model simulations. Chemical constituent changes are shown to drive a cooling of the polar stratosphere during spring and summer. Tropical Indian Ocean warming, itself a response to chemical constituent changes, drives a warming of the polar stratosphere, opposite to the local radiatively driven cooling. Our model experiments suggest that warming of the tropical Indian Ocean initiates a potent dynamical mechanism for changing high latitude climate, one that must be considered for accurate attribution of SH polar climate change.

PSD-South Conference Room (1D403)
Wednesday, 11 April 2007
2:00pm Refreshments at 1:50 pm

SECURITY: If you are coming from outside the NOAA campus, please be advised that you will need an on-site sponsor. Please contact that person in advance of the seminar to be put on the list and allow 10 minutes extra on the day of the seminar. Please contact Joe Barsugli (303-497-6042) or Lucia Harrop (303-497-6188) at least a day before the seminar if you have any questions.