Physics
Scientific paper
Aug 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985georl..12..495h&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 12, Aug. 1985, p. 495-497.
Physics
8
Atmospheric Composition, Chemiluminescence, Nitric Oxide, Polar Regions, Rocket-Borne Instruments, Stratosphere, Abundance, Alaska, Atmospheric Models
Scientific paper
The vertical profiles of nitric acid were measured over Poker Flat, Alaska, in August 1984 and January and February 1985 using a rocket-launched parachute-deployed chemiluminescence sensor. Results for the altitude range 35-45 km indicate a large seasonal variation, with wintertime mixing ratios being a factor of two above summer values. The winter profiles contain sharp positive vertical gradients persisting through the highest altitudes observed. Above the stratopause, the mixing ratio observed in February increases rapidly and between 52 and 53 km reaches 148.9 ppbv, an order of magnitude greater than typical mid-latitude values measured with this instrument. Such behavior is consistent with the idea that nitric oxide produced at greater altitudes reaches the high-latitude upper stratosphere or lower mesosphere in winter. The results support the existence of a vertical coupling between diverse regions of the atmosphere in the high-latitude winter.
Frederick John E.
Horvath Jorge
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