The polar stratospheric cloud event of January 24. II - Photochemistry

• Main Authors: Jones, R. L., Mckenna, D. S., Solomon, S., Poole, L. R., Brune, W. H.
• Format: Other/Unknown Material
• Language: unknown
• Published: 1990
• Subjects: 46; Arctic
• Online Access: http://ntrs.nasa.gov/search.jsp?R=19900041466

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. This paper presents a diagnosis of observations obtained using the ER-2 on January 24, 1989, using a Lagrangian coupled microphysical-photochemical model. The high chlorine monoxide mixing ratios observed from the ER-2 on the afternoon of January 24, 1989 are interpreted as a result of in situ heterogeneous release of reactive chlorine from the reservoirs HCl and CIONO2 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.