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During the Arctic Airborne Stratospheric Expedition, simultaneous measurements of aerosol size distribution and NO y , (HNO 3 + NO + NO 2 + 2·N 2 O 5 ) were made along ER‐2 flight paths. The flow characteristics of the NO y instrument allow us to derive the condensed NO y amount (assumed to be HNO 3 ) present during polar stratospheric cloud (PSC) events. Analysis of the January 24 th flight indicates that this condensed HNO 3 amount does not agree well with the aerosol volume if the observed PSCs are composed of solid nitric acid trihydrate (NAT), as is generally assumed. However, the composition agrees well with that predicted for liquid H 2 SO 4 /HNO 3 /H 2 O solution droplets using a new Aerosol Physical Chemistry Model (APCM). The agreement corresponds in detail to variations in temperature and humidity. The weight percentages of H 2 SO 4 , HNO 3 , and H 2 O derived from the measurements all correspond to those predicted for ternary, liquid solutions.
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Drdla et al. (1994) studied this question.
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