Measurements of atmospheric trace gas concentrations during the field campaign in Juelich 1988

Abstract

Our current understanding of the gas phase chemistry of the lower troposphere is based on measurements of trace gas concentrations in the atmosphere, laboratory studies of gas phase reactions and model calculations of the relevant chemical processes. The ultimate validation of a reaction scheme can only be derived from a comparison of model results with experimental data from measurements in the atmosphere. In order to establish an extended and reliable experimental data set on which such a comparison could be based the Institut fuer Atmosphaerische Chemie of the Forschungszentrum Juelich (KFA) has been conducting field campaigns for a number of years. One such campaign took place in Juelich from May 9 - June 10 in 1988. Many of the relevant trace species were measured on a continuous basis together with photolysis frequencies and meteorological parameters. All measurements were ground based and included OH, O_3, NO, and NO_2, NO_y, HCHO, SO_2, CH_4, CO, non methane hydrocarbons up to C_5, peroxyacetylnitrate, and aldehydes. The photolysis frequencies of O_3 and NO_2 were also monitored, as were atmospheric temperature, relative humidity, wind speed, and wind direction. All quantities were measured in-situ except OH and SO_2, which were exclusively measured by a long path differential optical absorption technique. HCHO, NO_2, and O_3 were determined by in-situ and also by long-path-absorption methods for intercomparison. (orig./EF)SIGLEAvailable from TIB Hannover: RA 831(2731) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekDEGerman