Twentieth Century Climate in the Stratosphere and Upper Troposphere
Abstract
Monthly averaged temperature data from fifteen coupled Atmospheric Oceanic Global Circulation Models (AOGCMs) and eight Chemistry Climate Models (CCMs) are compared to radiosonde and satellite observations to assess model performance and study the role of various forcing mechanisms on 20th century trends. Overall, CCMs and AOGCMs that include ozone forcing agree reasonably well with observations in the lower stratosphere. The main exception is in the Southern Hemisphere extratropics, where significant differences between models and observations are found during DJF and JJA. In the middle troposphere 500hPa), we also find significant difference between models and observation, both in the annual mean and during JJA. The connection between ozone forcing and model temperature trends, coupled with the role of interactive chemistry, is analyzed and will be presented.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2008
- Bibcode:
- 2008AGUFM.A41B0103T
- Keywords:
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- 3305 Climate change and variability (1616;
- 1635;
- 3309;
- 4215;
- 4513)