Column abundance and the long-term trend of hydrogen chloride (HCl) above the Jungfraujoch Station |
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| Authors: | R Zander G Roland L Delbouille A Sauval C B Farmer R H Norton |
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| Institution: | (1) Institute of Astrophysics, University of Liège, B-4200 Liège-Ougrée, Belgium;(2) Observatiore Royal de Belgique, B-1180 Brussels-Uccle, Belgium;(3) Jet Propulsion Laboratory, California Institute of Technology, 91108 Pasadena, CA, U.S.A. |
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| Abstract: | The integrated column amount of hydrogen chloride has been monitored above the International Scientific Station of the Jungfraujoch (Switzerland) during the last 8 years. The results deduced from solar absorption measurements near 3.42  m indicate a secular trend equivalent to (0.75±0.2) % increase per year since 1978, superimposed on a significant short-term variability which can be partly attributed to the tropospheric component of the total HCl burden. Based on an intensified set of measurements carried out over the last three years, a seasonal component in the total content of HCl has been established for the first time, showing a minimum occuring in early winter and a maximum during the spring. |
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| Keywords: | Hydrogen chloride atmospheric composition trace gases trends |
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