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Three dimensional modelling of chlorine activation in the Arctic stratosphere
Author(s) -
Kettleborough J. A.,
Carver G. D.,
Lary D. J.,
Pyle J. A.,
Scott P. A.
Publication year - 1994
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 - 10.1029/93gl03048
Subject(s) - stratosphere , polar vortex , atmospheric sciences , polar , northern hemisphere , ozone depletion , arctic , environmental science , climatology , atmospheric chemistry , chlorine , ozone , vortex , the arctic , mixing ratio , box model , southern hemisphere , chemical reaction , ozone layer , meteorology , chemistry , geology , physics , oceanography , organic chemistry , astronomy
The UK Universities Global Atmospheric Modelling Programme (UGAMP) General Circulation Model has been used to study the chemical evolution of the northern hemisphere polar vortex. A run that includes a parametrisation of the heterogeneous reactions occurring on polar stratospheric clouds (PSCs) has been initialised with the ECMWF analyses of the 5th of January 1992. This run produces high values of active chlorine within the polar vortex, for example mixing ratios of ClO x (=Cl+ClO+2×Cl 2 O 2 ) of 1.8ppbv are calculated after six days of integration, with correspondingly low values of HCl and ClONO 2 . During warm periods of this model run, when the PSC reactions are not active, the ClO x is converted slowly back into ClONO 2 . Chemical loss of ozone in January in the model is small.