Ground Based FTIR Measurements of Stratospheric Species from Harestua, Norway During Sesame and Comparison with Models |
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| Authors: | B Galle J Mellqvist DW Arlander I Fløisand MP Chipperfield AM Lee |
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| Institution: | (1) Swedish Environmental Research Institute (IVL), P.O. Box 47086, S-40258 Göteborg, Sweden;(2) Department of Physics, Chalmers University of Technology and University of Göteborg, S-412 96 Göteborg, Sweden;(3) Norwegian Institute for Air Research, P.O. Box 100, 2007 Kjeller, Norway;(4) Department of Chemistry, University of Cambridge, Lensfield Rd, Cambridge, CB2 1EW, United Kingdom |
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| Abstract: | Vertical columns of HF, HCl, HNO3, ClONO2, N2O, ClO and COF2 were measured at Harestua, Norway (60.22° N, 10.75° E, Elevation 600 a.s.l.) beginning on 24 November 1994 and concluding on 1 May 1995 during Phase-III of the SESAME (Second European Stratospheric Arctic and Mid-latitude Experiment) measurement campaign. The vertical columns of HCl, HNO3 and ClONO2 measured on 81 days were compared with columns calculated by the 3-D Cambridge model SLIMCAT. In addition the results were also interpreted by comparison with a photochemical trajectory model. Good agreement was seen for HCl while the nitrogen compounds showed larger discrepancies, especially for ClONO2. Evidence for chlorine activation was seen with 65% reduction of the chlorine reservoirs (HCl + ClONO2) while the levels of ClO were greatly enhanced. Interpretation of the loss with the trajectory model indicated condensation of chlorine on PSCs. The vertical column ratio of COF2 and HF was measured to 0.21 outside the vortex and a factor of two lower inside. The recovery of ClONO2 was seen to be much faster than that of HCl in the early spring. |
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| Keywords: | SESAME polar vortex arctic stratosphere ground based FTIR hydrogen fluoride hydrogen chloride nitric acid chlorine nitrate nitrous oxide chlorine monoxide carbonyl fluoride 3D-Model photochemical trajectory model |
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