Physics
Scientific paper
Mar 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26..599l&link_type=abstract
Geophysical Research Letters, Volume 26, Issue 5, p. 599-602
Physics
5
Atmospheric Composition And Structure: Middle Atmosphere-Constituent Transport And Chemistry, Global Change: Atmosphere, Global Change: Remote Sensing
Scientific paper
We present ground based millimeter-wave measurements of Arctic stratospheric ozone at Ny-Ålesund, Spitsbergen (79N, 12E), for winter 1997/98. Vortex averaged chemical ozone depletion rates around the 475 K isentropic level were derived from our observations using measured ozone trends for 20 day periods and calculations of diabatic descent inside the vortex. Back trajectory calculations for air-parcels crossing Ny-Ålesund show that measurements at Ny-Ålesund were representative for vortex air-masses. Significant chemical ozone depletion was observed during one period at the end of February 1998 with loss rates of 32 ppb/day around the 475 K isentropic level. During this period the loss rate was higher than in February 1997. Due to the early breakup of the polar vortex, the chemical ozone depletion stopped in March and the accumulated loss is found to be 0.64+/-0.2ppm in 1997/98.
Barry B.
Klein Ulf
Künzi Klaus F.
Langer James
Sinnhuber Björn-Martin
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