Abstract
Observations of the global distribution of nitric acid (HNO 3) obtained by the Cryogenic Limb Array Etalon Spectrometer (CLAES) instrument on the Upper Atmospheric Research Satellite (UARS) have considerably extended our knowledge of its spatial and temporal distribution. The data span 16 months, and extend to 80 °S, within the Antarctic vortex during southern winter. The evaluation of the accuracy, precision, and resolution of these data are briefly described. The zonal mean distribution of nitric acid is characterized by a stratospheric layer with largest mixing ratios near 30 hPa in polar regions, sloping up to a slightly higher altitude but low mixing ratios in the tropics. New features are regions of very low nitric acid within the Antarctic vortex, and sensitivity to stratospheric aerosol concentration.
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