During the 1988/89 Airborne Arctic Stratospheric Expedition (AASE), observations of the chemical composition, aerosol characteristics and atmospheric state were obtained from two aircraft, a NASA ER‐2 and a DC‐8. In this paper we present a diagnosis of observations obtained using the ER‐2 on January 24, 1989, using a Lagrangian coupled microphysical‐photochemical model. We interpret the high chlorine monoxide mixing ratios observed from the ER‐2 on the afternoon of January 24, 1989 as a result of in situ heterogeneous release of reactive chlorine from the reservoirs HCl and ClONO2 on type 1 polar stratospheric cloud particles observed to be present at that time. This essential element in theories of polar ozone depletion has never before been observed directly in the stratosphere.
All Science Journal Classification (ASJC) codes
- Earth and Planetary Sciences(all)