Other
Scientific paper
Mar 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990georl..17..429p&link_type=abstract
Geophysical Research Letters, Supplement (ISSN 0094-8276), vol. 17, March 1990, p. 429-432.
Other
6
Atmospheric Temperature, Cloud Cover, Nitric Acid, Ozone Depletion, Polar Meteorology, Stratosphere, Aerosols, Atmospheric Chemistry, Chlorine Compounds, Free Radicals, Research Aircraft, Winter
Scientific paper
As shown independently by two different techniques, nitric acid aerosols and polar stratospheric clouds (PSCs) both form below similar threshold temperatures. This supports the idea that the PSC particles involved in chlorine activation and ozone depletion in the winter polar stratosphere are composed of nitric acid. One technique used to show this is the inertial impaction of nitric acid aerosols using an Er-2 aircraft; the other method is remote sensing of PSCs by the Stratospheric Aerosol Measurement (SAM II) satellite borne optical sensor. Both procedures were in operation during the Arctic Airborne Stratospheric Expedition in 1989, and the Airborne Antarctic Ozone Experiment in 1987. Analysis of Arctic particles gathered in situ indicates the presence of nitric acid below a 'first appearance' temperature Tfa = 202 K. This is the same highest temperature at which PSCs are seen by the SAM II satellite. In comparison, a 'first appearance' temperature Tfa = 198 K as found for the Antarctic samples.
Goodman Jindra K.
Hamill Patrick
McCormick Patrick M.
Pueschel Rudolf F.
Snetsinger Kenneth G.
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