Computer Science – Sound
Scientific paper
Aug 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990georl..17.1275s&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 17, Aug. 1990, p. 1275-1282. Research supported by BMFT and NSF.
Computer Science
Sound
36
Aerosols, Arctic Regions, Balloon Sounding, Nitric Acid, Ozone Depletion, Stratosphere, Atmospheric Chemistry, Low Temperature Tests, Mass Spectrometers, Pressure Distribution, Temperature Profiles, Vertical Distribution
Scientific paper
A case study of nitric acid trihydrate (NAT) aerosol formation in the winter arctic stratosphere using balloon-borne measurements of gaseous nitric acid and aerosols is presented. The measurements were made under very low stratospheric temperature conditions, with minimum values of 186 K at about 24 km altitude, being approximately six degrees less than the existence temperature T(NAT) for NAT aerosols. It is concluded from these data that rapid formation of NAT-aerosols associated with substantial condensational depletion of gaseous nitric acid occurred only at temperatures of approximately three to four degrees below T(NAT) corresponding to large HNO3-supersaturations, which are probably required for activation of a major fraction of preexisting condensation nuclei. Also balloon-borne aerosol measurements over the size range r = 0.01 to 10 microns on January 31, 1990 were used to determine the HNO3 vapor mass deposited in Arctic NAT clouds in the 21-24 km region. Results indicate that the maximum inferred HNO3 vapor mixing ratio that condensed in the cloud was approximately 4 ppbv, in good agreement with the observed depletion of HNO3 vapor in the same altitude region under like temperature conditions 23 hours earlier.
Arnold Frank
Deshler Terry
Hofmann Dirk
Schlager Hans
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