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HNO 3 and SO 2 were measured by chemical ionization mass spectrometry at the South Pole (SP) during ISCAT 2000 (December, 2000). HNO 3 mixing ratios averaged 22pptv and ranged from less than 5 to 68pptv. A simple steady state photochemical analysis indicates that most of the time HNO 3 is deposited to the snow with a lifetime of the order of a few hours. Periods of...