On the temperature dependence of polar stratospheric clouds

Details On the temperature dependence of polar stratospheric clouds On the temperature dependence of polar stratospheric clouds

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991georl..18..424f&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 18, March 1991, p. 424-427. Research supported by Antarctic Program of Italy

Physics

5

Atmospheric Temperature, Cloud Cover, Ozone Depletion, Polar Regions, Scattering Cross Sections, Stratosphere, Nitric Acid, Particle Size Distribution, Temperature Dependence

Scientific paper

Using data obtained by an optical lidar at the Amundsen-Scott South-Pole Station during May-October 1988, the dependence on temperature of the backscattering cross section of the polar stratospheric clouds is investigated. It is shown that the observed sensitivity of the backscattering cross section to temperature can be associated primarily with the phase transitions of the HNO3/H2O system and, secondarily, with a progressive diminution of the total content of H2O and HNO3 with height, due to sedimentation. Results indicate that it is possible to distinguish the pure trihydrate from the mixed ice-trihydrate phase in the composition of the aerosol.

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