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The tropospheric distribution of formaldehyde during TROPOZ II |
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| Authors: | D W Arlander D Brüning U Schmidt D H Ehhalt |
| Institution: | (1) Institüt für Atmosphärische Chemie, Forschungszentrum Jülich GmbH, Postfach 1913, 52425 Jülich, Germany;(2) Present address: Institutet för Vatten-och Luftvardforskning, P.O. Box 47086, S-40258 Göteborg, Sweden;(3) Present address: Institut für Meteorologie und Geophysik, Johann Wolfgang Goethe-Universität, Postfach 11 19 32, 60054 Frankfurt, Germany |
| Abstract: | A series of 149 measurements of the HCHO mixing ratio were made between 0 and 10 km altitude and 70° N to 60° S latitude during TROPOZ II. The data show a vertical decrease of the HCHO mixing ratio with altitude at all latitudes and a broad latitudinal maximum in the HCHO mixing ratio between 30° N and 30° S at all altitudes. The measured mixing ratios of HCHO are considerably higher than those expected from CH4 oxidation alone, but agree broadly with the average latitude by altitude distribution of HCHO derived by a 2D model including emissions of C1–C7 hydrocarbons. A number of the regional scale deviations of the measured HCHO distribution from the average modelled one can be explained in terms of the local wind field. |
| Keywords: | formaldehyde background troposphere concentration distribution aircraft sampling technique methane oxidation |
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