Articles | Volume 9, issue 14
Atmos. Chem. Phys., 9, 4559–4573, 2009
https://doi.org/10.5194/acp-9-4559-2009
Atmos. Chem. Phys., 9, 4559–4573, 2009
https://doi.org/10.5194/acp-9-4559-2009

  15 Jul 2009

15 Jul 2009

Modelling multi-phase halogen chemistry in the remote marine boundary layer: investigation of the influence of aerosol size resolution on predicted gas- and condensed-phase chemistry

D. Lowe, D. Topping, and G. McFiggans D. Lowe et al.
  • School of Earth, Atmospheric and Environmental Science, University of Manchester, Manchester, UK

Abstract. A coupled box model of photochemistry and aerosol microphysics which explicitly accounts for size-dependent chemical properties of the condensed-phase has been developed to simulate the multi-phase chemistry of chlorine, bromine and iodine in the marine boundary layer (MBL). The model contains separate seasalt and non-seasalt modes, each of which may be composed of 1–16 size-bins. By comparison of gaseous and aerosol compositions predicted using different size-resolutions with both fixed and size-dependent aerosol turnover rates, it was found that, for halogen-activation processes, the physical property initialisation of the aerosol-mode has a significant influence on gas-phase chemistry. Failure to adequately represent the appropriate physical properties can lead to substantial errors in gas-phase chemistry. The size-resolution of condensed-phase composition has a less significant influence on gas-phase chemistry.

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