A GCM simulation of the ozone seasonal variations at high latitudes in the Southern Hemisphere

Details A GCM simulation of the ozone seasonal variations at high latitudes in the Southern Hemisphere A GCM simulation of the ozone seasonal variations at high latitudes in the Southern Hemisphere

Nov 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986georl..13.1304c&link_type=abstract

Geophysical Research Letters (Supplement) (ISSN 0094-8276), vol. 13, Nov. 1986, p. 1304-1307.

Physics

4

Annual Variations, Atmospheric Circulation, Atmospheric Models, Ozone, Southern Hemisphere, Atmospheric Heating, Photochemical Reactions, Polar Regions, Spring (Season), Stratosphere, Vortices

Scientific paper

A General Circulation Model is used to simulate the O3 seasonal variations in the Southern Hemisphere at high latitudes. The model reproduces many features of the stratospheric circulation and the ozone distribution. In particular a very cold and intense polar vortex develops from midwinter through spring and lasts until early November. The ozone content is minimum in the polar vortex, below 300 Dobsons, in spring. This value is still significantly higher than the amounts near 200 Dobsons recently measured in several Dobson stations in Antarctica. The possible deficencies of the model photochemistry responsible for this discrepancy are discussed. The rapid polar ozone increase which follows the final warming is fairly well reproduced by the model. The warming starts in early November and is associated with an increase of the planetary wave 1 amplitude beyond 60 deg of latitude. The polar vortex follows a westward trajectory which starts from the pole and crosses over the Argentine Islands before vanishing at midlatitudes, in good agreement with observations.

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