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ILAS observations of chemical ozone loss in the Arctic vortex during early spring 1997
Author(s) -
Sasano Y.,
Terao Y.,
Tanaka H. L.,
Yasunari T.,
Kanzawa H.,
Nakajima H.,
Yokota T.,
Nakane H.,
Hayashida S.,
Saitoh N.
Publication year - 2000
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/1999gl010794
Subject(s) - ozone , environmental science , atmospheric sciences , polar vortex , occultation , altitude (triangle) , descent (aeronautics) , ozone layer , diabatic , arctic , ozone depletion , atmospheric sounding , meteorology , climatology , geology , physics , oceanography , geometry , mathematics , astronomy , adiabatic process , thermodynamics
Chemical ozone loss rates were estimated for the Arctic stratospheric vortex by using ozone profile data (Version 3.10) obtained with the Improved Limb Atmospheric Spectrometer (ILAS) for the spring of 1997. The analysis method is similar to the Match technique, in which an air parcel that the ILAS sounded twice at different locations and at different times was searched from the ILAS data set, and an ozone change rate was calculated from the two profiles. A statistical analysis indicates that the maximum ozone loss rate was found on the 450 K potential temperature surface in February, amounting to 84 ppbv/day. The integrated ozone loss for two months from February to March 1997 showed its maximum of 1.5±0.1 ppmv at the surface that followed the diabatic descent of the air parcels and reached the 425 K level on March 31. This is about 50% of the initial (February 1) ozone concentration. The present study demonstrated that data from a solar occultation sensor with a moderate altitude resolution can be used for the Match analysis.