Abstract
Abstract The altitude distribution of nitric acid vapour was measured from observations of atmospheric thermal emission in the 11.3‐μm band during a balloon ascent launched at 2317 GMT on 22 July 1974 from Churchill, Manitoba (latitude 58.7°N). The total amount of nitric acid above the tropopause was 0.32 matmcm. The nitric acid layer was peaked at 24 km with a maximum mixing ratio of 5.5 ppbv. This measurement is similar to other available measurements of nitric acid in terms of layer shape and peak concentrations. The total amount of 0.32 matmcm is consistent with aircraft measurements of the latitudinal variation of nitric acid.
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