GLOMAP-mode in UKCA linked to Tropospheric Chemistry (IsopTrop)

This configuration involves an extension to the UKCA Tropospheric Chemistry with Isoprene (IsopTrop) scheme to additionally include tropospheric aerosol-precursor chemistry.

In addition to the 49 advected tracers in IsopTrop, 11 extra gas phase tracers are added for the aerosol chemistry. These consist of 8 sulphur species (DMS, SO2, MSA, H2SO4, DMSO, CS2, COS, H2S), ammonia and two organic species. The two organic species are a monoterpene tracer "MONOTER" and an oxidation product "SECORG" following the simple secondary organic aerosol production scheme developed for the GLOMAP-TOMCAT chemistry transport model (e.g. Spracklen et al, 2006).

The H2SO4 and SECORG tracers condense into the sulphate and organic carbon components in the GLOMAP-mode aerosol scheme.

Aqueous phase oxidation of SO2 by H2O2 and O3 is calculated based on an effective Henry's law approach and produces sulphate in the GLOMAP-mode accumulation and coarse soluble modes.

As for the IsopTrop chemistry, this extended scheme (IsopTrop+Aero) uses the sparse-matrix Newton-Raphson solver.

Spracklen, D. V., Carslaw, K. S., Kulmala, M., et al.: The contribution of boundary layer nucleation events to total particle concentrations on regional and global scales, Atmos. Chem. Phys., 6, 5631--5648, doi:10.5194/acp-6-5631-2006, 2006.