Difference between revisions of "GLOMAP-mode in UKCA linked to Tropospheric Chemistry (StdTrop)"

Latest revision as of 10:01, 18 February 2011

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

The StdTrop chemistry scheme describes the inorganic chemistry of Ox-NOx-HOx-CO chemistry, together with near-explicit degradation schemes for methane, ethane, propane, and acetone.

To couple StdTrop to the GLOMAP-mode aerosol scheme, StdTrop is extended to treat the degradation of SO2, DMS and a monoterpene tracer. In addition, two tracers are used to represent species which are used in the GLOMAP-mode nucleation and condensation routines: sulphuric acid produced from the oxidation of SO2 with the hydroxyl radical (OH); and a secondary organic species representing the condensable species from monoterpene oxidation. The simple monoterpene oxidation scheme is that used when GLOMAP is used in the chemistry transport model (see Spracklen et al., 2006). An ammonia tracer is also included.

A scheme for the oxidation of SO2 within clouds by dissolved hydrogen peroxide and ozone is also provided to give sulphate production rates which are passed to GLOMAP-mode for in-cloud aerosol growth rates.

Note that, as for the StdTrop chemistry, this extended scheme (StdTrop+Aero) uses the Backward-Euler 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.

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 This configuration involves an extension to the UKCA Standard Tropospheric Chemistry (StdTrop) scheme to additionally include tropospheric aerosol-precursor chemistry.
+The StdTrop chemistry scheme describes the inorganic chemistry of Ox-NOx-HOx-CO chemistry, together with
-In addition to the 26 advected tracers in StdTrop, 7 extra tracers are added for the aerosol chemistry. These consist of 4 sulphur species (DMS, SO2, MSA, H2SO4), 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).
+near-explicit degradation schemes for methane,
+ethane, propane, and acetone.
-The H2SO4 and SECORG tracers condense into the sulphate and organic carbon components in the GLOMAP-mode aerosol scheme.
+To couple StdTrop to the GLOMAP-mode aerosol scheme,
+StdTrop is extended to treat the degradation of  SO2,
+DMS and a monoterpene tracer.
+In addition, two tracers are used to represent species
+which are used in the GLOMAP-mode nucleation and condensation
+routines: sulphuric acid produced from the oxidation of SO2 with the hydroxyl radical (OH); and a secondary organic species representing the condensable
+species from monoterpene oxidation. The simple monoterpene
+oxidation scheme is that used when GLOMAP is used in
+the chemistry transport model (see Spracklen et al., 2006).
+An ammonia tracer is also included.
+A scheme for the oxidation of SO2 within clouds by dissolved hydrogen peroxide and ozone is also provided to give
-Aqueous phase oxidation of SO2 by H2O2 and O3 is calculated based on an effective Henry's law approach and produces sulphate inthe GLOMAP-mode accumulation and coarse soluble modes.
+sulphate production rates which are passed to GLOMAP-mode
+for in-cloud aerosol growth rates.
-As for the StdTrop chemistry, this extended scheme (StdTrop+Aero)uses the Backward-Euler solver.
+Note that, as for the StdTrop chemistry, this extended scheme (StdTrop+Aero) uses the Backward-Euler 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.