Diurnal variation of nitric oxide at 26 km

Details Diurnal variation of nitric oxide at 26 km Diurnal variation of nitric oxide at 26 km

Aug 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989georl..16..867k&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 16, Aug. 1989, p. 867-870.

Physics

2

Chemiluminescence, Diurnal Variations, Nitric Oxide, Photochemical Reactions, Stratosphere, Atmospheric Composition, Balloon-Borne Instruments, Solar Position, Time Dependence, Zenith

Scientific paper

Results from a chemiluminescent NO detector aboard a balloon at 26 km altitude are presented. The NO concentration was shown to increase rapidly near local sunrise (when the solar zenith angle reached 92.7 deg), to continue to increase more slowly for a further 7-8 hours, and to then become stable. The diurnal NO variation predicted using a time-dependent photochemical model agrees well with the observed temporal NO variation. It is suggested that the observed slow increase in NO can be quantitatively explained by the photodissociation of N2O5. The N2O5 concentration just before sunrise is estimated to be 1.9 + or - 0.4 ppbv at 26 km.

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