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Modeling the multiphase processing of an urban and a rural air mass with COSMO-MUSCAT

Schrödner, Roland LU ; Tilgner, Andreas; Wolke, Ralf and Herrmann, H. (2014) In Urban Climate 10. p.720-731
Abstract
A reduced version of the complex aqueous phase mechanism CAPRAM3.0i (C3.0RED) was used in the regional chemistry transport model COSMO–MUSCAT in a 2-D application. Besides sulfate and nitrate production, the mechanism treats a complex HOx-chemistry, transition metal ion chemistry and organic species up to C4. The effects of the cloud chemistry on the chemical composition of air and particles were investigated. Sensitivity studies were conducted for an urban and a rural air mass. For this purpose simulations with C3.0RED were compared to ones with a simple inorganic aqueous phase mechanism (INORG) and without aqueous phase chemistry. A reduction of the gas phase concentrations of major oxidants was observed especially in the urban... (More)
A reduced version of the complex aqueous phase mechanism CAPRAM3.0i (C3.0RED) was used in the regional chemistry transport model COSMO–MUSCAT in a 2-D application. Besides sulfate and nitrate production, the mechanism treats a complex HOx-chemistry, transition metal ion chemistry and organic species up to C4. The effects of the cloud chemistry on the chemical composition of air and particles were investigated. Sensitivity studies were conducted for an urban and a rural air mass. For this purpose simulations with C3.0RED were compared to ones with a simple inorganic aqueous phase mechanism (INORG) and without aqueous phase chemistry. A reduction of the gas phase concentrations of major oxidants was observed especially in the urban environment. Compared to INORG, C3.0RED is always more acidic leading to shifts in several chemical subsystems, (e.g. production of sulfate). Using C3.0RED instead of INORG, differences in sulfate mass of 3% to −15% occurred. The modeled O/C-ratio tends to be higher than observations as C3.0RED does not consider the whole population of organics and no insoluble organic mass. Nevertheless, the modeled concentration of glyoxalic acid is in the range of atmospheric measurements in both environments, whereas oxalic acid and pyruvic acid are underestimated in the urban case. (Less)
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author
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Multiphase cloud chemistry, CAPRAM, Regional modeling, Chemistry transport model, Urban environment
in
Urban Climate
volume
10
pages
720 - 731
publisher
Elsevier
external identifiers
  • scopus:84927972844
ISSN
2212-0955
DOI
10.1016/j.uclim.2014.02.001
language
English
LU publication?
no
id
591276ee-cff9-4829-b7e9-d847c0d7153d
date added to LUP
2017-07-05 14:56:53
date last changed
2017-08-09 13:50:26
@article{591276ee-cff9-4829-b7e9-d847c0d7153d,
  abstract     = {A reduced version of the complex aqueous phase mechanism CAPRAM3.0i (C3.0RED) was used in the regional chemistry transport model COSMO–MUSCAT in a 2-D application. Besides sulfate and nitrate production, the mechanism treats a complex HOx-chemistry, transition metal ion chemistry and organic species up to C4. The effects of the cloud chemistry on the chemical composition of air and particles were investigated. Sensitivity studies were conducted for an urban and a rural air mass. For this purpose simulations with C3.0RED were compared to ones with a simple inorganic aqueous phase mechanism (INORG) and without aqueous phase chemistry. A reduction of the gas phase concentrations of major oxidants was observed especially in the urban environment. Compared to INORG, C3.0RED is always more acidic leading to shifts in several chemical subsystems, (e.g. production of sulfate). Using C3.0RED instead of INORG, differences in sulfate mass of 3% to −15% occurred. The modeled O/C-ratio tends to be higher than observations as C3.0RED does not consider the whole population of organics and no insoluble organic mass. Nevertheless, the modeled concentration of glyoxalic acid is in the range of atmospheric measurements in both environments, whereas oxalic acid and pyruvic acid are underestimated in the urban case.},
  author       = {Schrödner, Roland and Tilgner, Andreas and Wolke, Ralf and Herrmann, H.},
  issn         = {2212-0955},
  keyword      = {Multiphase cloud chemistry,CAPRAM,Regional modeling,Chemistry transport model,Urban environment},
  language     = {eng},
  pages        = {720--731},
  publisher    = {Elsevier},
  series       = {Urban Climate},
  title        = {Modeling the multiphase processing of an urban and a rural air mass with COSMO-MUSCAT},
  url          = {http://dx.doi.org/10.1016/j.uclim.2014.02.001},
  volume       = {10},
  year         = {2014},
}