Comparison of measured OH concentrations with model calculations

摘要: The influence of chemical precursors and sunlight on the atmospheric OH abundance is investigated by a comparison locally measured tropospheric with model calculations. latter are based gas phase reaction mechanism regional acid deposition (RADM2) which incorporates an explicit inorganic comprehensive organic chemistry. experimental data were obtained in planetary boundary layer during two sets campaigns. In Deuselbach (1983) Schauinsland (1984), rural conditions encountered NOx concentrations average 2.2 0.9 ppb, respectively. This set was already compared calculations upon older less detailed scheme (Perner et al., 1987). Since then reanalyzed leading to modified also precursor concentrations. For consistent more recent campaigns Julich (1987 1988) we have redone modeled 1983 1984 correlate well coefficient correlation r = 0.73. overpredicts about 20%. Under polluted 4 ppb between significantly smaller (r 0.61). Possible reasons not precursors, for example isoprene, inapplicability quasi-steady state under spatially inhomogeneous Julich. Again concentration 15%, somewhat than case. precision limited uncertainties rate constants.