Heterogeneous reactions on and in sulfate aerosols: Implications for the chemistry of the midlatitude tropopause region

摘要: A model is presented to simulate heterogeneous reactions of nitrogen, chlorine, and bromine compounds on in sulfate aerosols under conditions encountered the lowermost stratosphere upper troposphere. Box calculations were performed investigate impact these chemistry midlatitude tropopause region. The simulations reveal that considered conversions effectively dilute NOx cause a strong enhancement HOx ClOx mixing ratios. Lowermost stratospheric NOx/NOy OH/HO2 ratios can efficiently be reduced by reactions. further suggest also troposphere transformations lead denoxification. modeled tropospheric OH abundance when are taken into account. appears show large potential for activation BrOx. indicate induces ozone loss entire This governed hydrolysis N2O5 BrONO2. In troposphere, chlorine have major an enhanced aerosol loading assumed.