On the Impact of HO2-H2O Complexes in the Marine Boundary Layer: A Possible Sink for HO2

  • Author(s): Alexander Thomas Archibald, Kenichi Tonokura, Masahiro Kawasaki, Carl John Percival, and Dudley Edmund Shallcross
  • DOI:


  • Keywords: HO2-H2O complexes, Master chemical mechanism, CRI mechanism, Marine boundary layer, Criegee biradicals

The impact of the formation of HO2-H2O adducts following reaction between H2O and HO2 and subsequent reaction of this adduct on HOx, H2O2 and O3 as a function of relative humidity in the marine boundary layer has been investigated using a zero-dimensional box model. The results of simulations with different product yields for the reaction of HO2-H2O with HO2 were compared with base case data derived from current recommendations for tropospheric modelling. It is suggested that inclusion of reactions of the HO2-H2O adduct may provide a significant sink for HO2 which has so far not been considered in models of tropospheric chemistry and depending on reaction products may have a significant impact on H2O2 and O3.

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