Severe ozone depletion in the cold Arctic winter 2004-05

Details Severe ozone depletion in the cold Arctic winter 2004-05 Severe ozone depletion in the cold Arctic winter 2004-05

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3317815v&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 17, CiteID L17815

Physics

26

Atmospheric Composition And Structure: Middle Atmosphere: Composition And Chemistry, Global Change: Atmosphere (0315, 0325), Global Change: Impacts Of Global Change (1225), Atmospheric Processes: Middle Atmosphere Dynamics (0341, 0342), Atmospheric Processes: Polar Meteorology

Scientific paper

During a flight of the M55 Geophysica into the Arctic polar vortex on 7 March 2005, ozone, halogen species, tracers and water vapor were measured. Up to 90% chlorine activation and up to 60% ozone loss were found above 14 km, reflecting the low temperatures and extensive PSC formation prevalent in the Arctic stratosphere over the 2004/05 winter. Observations are generally well reproduced by CLaMS model simulations. The observed levels of active chlorine can only be reproduced by assuming significant denitrification of about 70%. Moderate dehydration up to 0.5 ppm is observed in some locations. We deduce a partial column ozone loss of 62 (+8/-17) DU below 19 km on 7 March.

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