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Field measurements of atmospheric peroxides were obtainedduring the summer on two consecutive years over urban Beijing, which highlighted the impacts of aerosols on the chemistry of peroxide compounds andhydroperoxyl radicals (HO2). The major peroxides were determined to behydrogen peroxide (H2O2), methyl hydroperoxide (MHP), andperoxyacetic acid (PAA). A negative correlation was found betweenH2O2 and PAA in rainwater, providing evidence for a conversionbetween H2O2 and PAA in the aqueous phase. A standard gas phasechemistry model based on the NCAR Master Mechanism provided a goodreproduction of the observed H2O2 profile on non-haze days butgreatly overpredicted the H2O2 level on haze days. We attributethis overprediction to the reactive uptake of HO2 by the aerosols,since there was greatly enhanced aerosol loading and aerosol liquid watercontent on haze days. The discrepancy between the observed and modeledH2O2 can be diminished by adding to the model a newly proposedtransition metal ion catalytic mechanism of HO2 in aqueous aerosols.This confirms the importance of the aerosol uptake of HO2 and thesubsequent aqueous phase reactions in the reduction of H2O2. Theclosure of HO2 and H2O2 between the gas and aerosol phasessuggests that the aerosols do not have a net reactive uptake ofH2O2, because the conversion of HO2 to H2O2 onaerosols compensates for the H2O2 loss. Laboratory studies for theaerosol uptake of H2O2 in the presence of HO2 are urgentlyrequired to better understand the aerosol uptake of H2O2 in thereal atmosphere

Impacts of aerosols on the chemistry of atmospheric trace gases: a case study of peroxides and HO&lt;sub&gt;2&lt;/sub&gt; radicals

Impacts of aerosols on the chemistry of atmospheric trace gases: a case study of peroxides and HO<sub>2</sub> radicals