Measurements of stratospheric gaseous nitric acid in the winter Arctic vortex using a novel rocket-borne mass spectrometric method

Details Measurements of stratospheric gaseous nitric acid in the winter Arctic vortex using a novel rocket-borne mass spectrometric method Measurements of stratospheric gaseous nitric acid in the winter Arctic vortex using a novel rocket-borne mass spectrometric method

Mar 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990georl..17..433s&link_type=abstract

Geophysical Research Letters, Supplement (ISSN 0094-8276), vol. 17, March 1990, p. 433-436. Research supported by BMFT.

Computer Science

Sound

19

Arctic Regions, Atmospheric Composition, Nitric Acid, Rocket Sounding, Rocket-Borne Instruments, Stratosphere, Atmospheric Chemistry, Mass Spectrometers, Ozone Depletion, Sweden, Vertical Distribution, Winter

Scientific paper

The altitude distribution of stratospheric gaseous nitric acid was measured on Januray 30, 1989 at Esrange (Sweden) in a particularly cold stratosphere (lowest temperature 190 K) using a novel rocket-borne ACIMS (active chemical ionisation spectrometry)-instrument. Within the coldest layer (18.5-22.6 km) gaseous nitric acid was found to be strongly depleted. Probably this depletion was caused by local nitric acid condensation leading to nitric acid trihydrate aerosols, which were still present in the same layer, and/or HNO3-removal from that layer by sedimentation of HNO3-containing aerosols. Threshold temperatures for nitric acid condensation of about 195-193 K (18,5 km) and 193 K (22.6 km) can be inferred from the present data being roughly consistent with theoretical model predictions.

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