Seasonal and latitudinal variation of the stratospheric concentration of HNO₃

Abstract

A sensitive spectral radiometer system capable of measuring the atmospheric emission in the 6.5µm to 13.0µm region has been constructed for use on the WB57F aircraft used on the Department of Transportation Climatic Impact Assessment Program. The data obtained with this instrument on a number of flights have been analyzed to determine the total HNO 3 column density above the aircraft at various latitudes and seasons. Examination of these data indicate a definite variation of HNO 3 column density with latitude and possible seasonal variations.