Measurements of tropospheric OH concentrations: A comparison of field data with model predictions |
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| Authors: | D Perner U Platt M Trainer G Hübler J Drummond W Junkermann J Rudolph B Schubert A Volz D H Ehhalt K J Rumpel G Helas |
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| Institution: | (1) Present address: Kernforschungsanlage Jülich, Institut für Atmosphärische Chemie, D-5170 Jülich, W. Germany;(2) Present address: Max-Planck-Institut für Chemie, Abt. Luftchemie, D-6500 Mainz, W. Germany;(3) Cooperative Institute for Research in Environmental Sciences, University of Colorado, 80309 Boulder, CO, USA;(4) Aeronomy Lab., NOAA, 325 Broadway, 80303 Boulder, CO, USA;(5) Present address: Institut für die Chemie der belasteten Atmosphäre, KFA, Jülich;(6) Umweltbundesamt, Meßstelle Deuselbach, D-5509 Deuselbach, W. Germany;(7) Max-Planck-Institut für Chemie, D-6500 Mainz, W. Germany |
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| Abstract: | Using long path UV absorption spectroscopy we have measured OH concentrations close to the earth's surface. The OH values observed at two locations in Germany during 1980 through 1983 range from 0.7×106 to 3.2×106 cm-3. Simultaneously we measured the concentrations of O3, H2O, NO, NO2, CH4, CO, and the light non methane hydrocarbons. We also determined the photolysis rates of O3 and NO2. This allows calculations of OH using a zero dimensional time depdendent model. The modelled OH concentrations significantly exceed the measured values for low NO
x
concentrations. It is argued that additional, so far unidentified. HO
x
loss reactions must be responsible for that discrepancy. |
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| Keywords: | OH-radicals troposphere long path absorption spectroscopy sensitivity study formaldehyde measurements |
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