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Measurements of chlorine partitioning in the winter Arctic stratosphere
Author(s) -
Stachnik Robert A.,
Salawitch Ross,
Engel Andreas,
Schmidt Ulrich
Publication year - 1999
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 - 10.1029/1999gl010817
Subject(s) - stratosphere , arctic , atmospheric sciences , environmental science , latitude , chlorine , polar vortex , the arctic , ozone depletion , ozone , climatology , chemistry , meteorology , geology , physics , oceanography , geodesy , organic chemistry
Measurements of the concentration profiles of key stratospheric reactive, reservoir and source gases, ClO, O 3 , HCl, N 2 O and CCl 2 F 2 , were made during two balloon flights in the Arctic on 27 January and 08 March 1995 that were part of the Second European Stratospheric Arctic and Mid‐latitude Experiment (SESAME). On 27 January, low abundances of HCl (∼250 ppt at 50 hPa) were measured in air parcels that had been at temperatures below the type I PSC existence threshold accompanied by high concentrations of ClO (1.6 ppb at 50 hPa). Calculations using the currently recommended photochemical data yield a ratio of [ClO]+2[Cl 2 O 2 ]+[HCl] to [Cl y ] near unity in these air parcels. The 08 March flight sampled warm stratospheric conditions outside the vortex with normal mid‐latitude ClO (<100ppt at 50 hPa) and HCl abundances comprising about half of the available chlorine at 50 hPa.