Physics
Scientific paper
Aug 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982georl...9..850p&link_type=abstract
Geophysical Research Letters, vol. 9, Aug. 1982, p. 850-853. Research supported by the Centre National d'Etudes Spatiales and D
Physics
2
Air Pollution, Atmospheric Composition, Diurnal Variations, Nitrogen Dioxide, Stratosphere, Accuracy, Atmospheric Attenuation, Pollution Monitoring, Pollution Transport, Spectrometers
Scientific paper
Spectrometric NO2 measurements were made through balloon-borne observations of sunlight absorption in the visible range, over the course of an entire day in September, 1979, at 43 deg N, zero deg W. The instrument and data processing method employed achieve a detection limit of NO2 along the line of sight of 4 x 10 to the 15th mol/sq cm. The results obtained show an NO2 diurnal variation in the lower stratosphere whose maximum is around noon, a vertical column density above 22 km which varies from 2.4 plus or minus 0.7 x 10 to the 15th mol/sq cm at 06:15 to 10.0 plus or minus 2.8 x 10 to the 15th mol/sq cm at 11:20 and 6.4 plus or minus 1.4 x 10 to the 15th mol/sq cm at 17:00. The means concentration at noon between 22 and 33.5 km corresponds to a mixing ratio of 13.1 plus or minus 4.8 ppbv. Through comparison with the 33 km solar spectrum, ground observations made on the day before the balloon's flight at 13:00 allow a direct measurement of the total atmospheric NO2 column density of 24 plus or minus 3 x 10 to the 15th mol/sq cm.
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