Stratospheric Circulation and Tracer/Ozone Changes in Response to Alternative Doubled CO2 Climate Depictions
Abstract
The effect of alternative representations of the doubled CO2 climate on the stratospheric circulation and tracer transport is presented with the GISS 4x5, 53 layer Global Climate/Middle Atmosphere Model. In addition to doubled atmospheric CO2, two sets of sea surface temperature changes are used, one with greater low latitude and overall warming; the differences are associated primarily with different high cloud cover optical thickness responses. While both result in an intensified subtropical circulation in the lower stratosphere, they have opposite effects on the high latitude residual circulation and the Arctic Oscillation phase. The effect each representation has on tracer transport is discussed, with primary emphasis on ozone distributions, utilizing the Linoz (linearized ozone) scheme. The corresponding effect the ozone changes have on the resulting doubled CO2 stratospheric circulation will also be discussed.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2001
- Bibcode:
- 2001AGUFM.A11C..02R
- Keywords:
-
- 0341 Middle atmosphere: constituent transport and chemistry (3334);
- 1620 Climate dynamics (3309);
- 3334 Middle atmosphere dynamics (0341;
- 0342)