Physics
Scientific paper
Apr 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991georl..18..767s&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 18, April 1991, p. 767-770. BMFT-supported research.
Physics
36
Air Sampling, Arctic Regions, Atmospheric Composition, Life (Durability), Trace Contaminants, Vortices, Chlorocarbons, Fluorocarbons, Methane, Nitrous Oxides, Vertical Distribution
Scientific paper
Five sets of vertical profiles of long-lived trace gases were measured in the stratosphere at high northern latitudes (68 deg N) during three field campaigns of the CHEOPS - Project. Large whole air samples were collected by means of balloon-borne cryogenic samples analyzed for their content of N2O, CH4, CFCl3, CH2Cl2, C2F3Cl3, CCl4, CH3Cl and CH3CCl3. The measured polar profiles will be compared with mean vertical distributions derived from a series of observations at midlatitudes (44 deg N). The difference indicates a pronounced effect of subsidence in the Arctic winter stratosphere with a net downward shift of the Arctic vertical profile by about 7 km over the time period from November until February. Owing to this efficient downward transport, the abundance of chlorine in the form of reservoir and reactive species, is increased in the lower Arctic stratosphere to about twice that observed at mid-latitudes.
Bauer Reimar
Khedim A.
Klein Einat
Kulessa Gerhard
Schmidt Ulrich
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