Abstract
During a further flight of the Oxford balloon-borne pressure modulator radiometer, altitude profiles of NO and NO 2 were measured simultaneously from mid-morning till sunset. An improved detector for the NO channel, a better procedure for interpolating between calibration points, and an improved error analysis yielded results of higher quality than from previous flights. During the day the NO 2 column above 24 km increased by 0.42 ± 0.28 to 1.86 ± 0.24 × 10 15 molecule cm -2 the NO column above 30 km reached a maximum of 5.2 ± 1.3 × 10 15 molecule cm -2 soon after noon, falling by 1.58 ± 0.77 × 10 15 molecule cm -2 by an hour before sunset. A detailed comparison of measured NO and NO 2 concentrations with those predicted by the Oxford two-dimensional diurnal model shows disagreement in their absolute values but close agreement in their daytime changes. The model predicts a fall in NO during the afternoon, as observed.
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Schedule a callMore From: Proceedings of the Royal Society of London. A. Mathematical and Physical Sciences
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