Dehydration mechanism in the Antarctic stratosphere during winter

Details Dehydration mechanism in the Antarctic stratosphere during winter Dehydration mechanism in the Antarctic stratosphere during winter

Aug 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988georl..15..863r&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 15, Aug. 1988, p. 863-866.

Physics

6

Antarctic Regions, Cloud Glaciation, Stratosphere, Water Vapor, Atmospheric Temperature, Sublimation, Winter

Scientific paper

The growth of ice nuclei through deposition of water vapor at temperatures below frost point is investigated in the context of the Antarctic winter stratosphere. The altitude and the ambient water vapor mixing ratio, as well as the size of the nuclei determine the ice particle growth rate, with higher altitudes requiring colder temperatures for ice deposition. The magnitude of the temperature decrease below the frost point and its evolution over the winter determine the residence time of the growing ice particles and the loss of water vapor at any altitude. A winter-long simulation, using the observed South Pole daily temperatures, suggests that, in the limit of weak latitudinal mixing over the austral winter, considerable dehydration can occur within the polar vortex, with the higher altitudes (above 22 km) experiencing the least losses.

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