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Column measurements of stratospheric trace species over Åre, Sweden in the winter of 1991–1992
Author(s) -
Bell W.,
Martin N. A.,
Gardiner T. D.,
Swann N. R.,
Woods P. T.,
Fogal P. F.,
Waters J. W.
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 - 10.1029/93gl01206
Subject(s) - stratosphere , trace gas , microwave limb sounder , polar vortex , ozone layer , atmospheric sciences , ozone depletion , spectrometer , ozone , altitude (triangle) , atmospheric sounding , environmental science , atmosphere of earth , mixing ratio , arctic , atmosphere (unit) , analytical chemistry (journal) , meteorology , geology , chemistry , physics , optics , environmental chemistry , oceanography , mathematics , geometry
Total vertical column amounts of stratospheric HCl, HF, ClONO 2 and HNO 3 are reported from high resolution infrared solar absorption spectra taken during the European Arctic Stratospheric Ozone Experiment in the winter of 1991–1992. These ground based measurements were made near Åre in North Sweden (63.4°N, 13.1°E) at an altitude of 800 m using a Fourier transform spectrometer and tunable diode laser heterodyne spectrometer. On 9th January 1992 the HCl vertical column dropped to 1.2 × 10 15 molecules cm −2 from a November average of 3.6 × 10 15 molecules cm −2 . The HCl drop occurred at a time when Åre was below the polar vortex and the lower stratospheric ClO column above Åre was elevated to ∼2 × 10 15 molecules cm −2 as measured by the Microwave Limb Sounder experiment on the Upper Atmosphere Research Satellite. These measurements indicate conversion of lower stratospheric chlorine from reservoir to chemically active forms.