Dehydration in the Antarctic stratosphere - Radiative effects

Details Dehydration in the Antarctic stratosphere - Radiative effects Dehydration in the Antarctic stratosphere - Radiative effects

Mar 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19..585m&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 19, March 20, 1992, p. 585-588.

Physics

2

Antarctic Regions, Dehydration, Ozone Depletion, Radiant Cooling, Stratosphere, Water Vapor, Atmospheric Moisture, Atmospheric Temperature, Chlorine, Radiative Heat Transfer, Two Dimensional Models

Scientific paper

A 2D model is used to investigate the effects of polar stratospheric clouds on the water vapor budget in the Antarctic stratosphere. It is shown that loss of stratospheric water vapor through formation and sedimentation of large ice particles decreases infrared cooling. This cooling reduction partially compensates the decreased ozone heating due to the formation of the Antarctic hole. Such a conclusion is reached by comparing a control unperturbed situation with two cases in which an ozone hole is formed with and without polar dehydration. It is shown that in the case of substantial loss of stratospheric water vapor since the years of the ozone hole formation, a dynamical mechanism may be necessary to explain the observed stratospheric cooling during the Antarctic spring. In this case, the combined radiative perturbation (H2O + O3) is too small to force this cooling. Instead, in the case of a negligible change of water vapor content, the O3 radiative perturbation could be entirely responsible for the observed secular cooling.

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