Intercomparison of stratospheric NO2 and NO3 measurements during MAP/GLOBUS 1983

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Middle Atmosphere, Nitrogen Dioxide, Nitrogen Oxides, Stratosphere, Comparison, Diurnal Variations, Light (Visible Radiation), Radiation Absorption, Thermal Emission

Scientific paper

Nitrogen dioxide and trioxide have been observed from balloons, an aircraft, and from the ground during MAP/GLOBUS 1983. Comparison between NO2 mixing ratios measured from balloons shows some agreement between remote sensing techniques on the one hand, and in situ methods on the other. The two sets of data which agree in the lower stratosphere at 20 km diverge at higher altitudes by a factor of 2 around 27 km, and 4 around 33 km. The NO2 column densities observed at sunset from the ground are in agreement with aircraft and balloon determinations, provided that the average mixing ratio below 16 km was indeed lower than 1.5 x 10 to the -10th. The diurnal variation of the NO2 column as determined from ground observations during the second half of September differs from the one seen in the stratosphere. A first comparison between NO3 nighttime remote measurements and preliminary in situ results shows a disagreement by a factor of 2.

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