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| Titel |
Impact of convective activity on tropospheric chemistry during the HOOVER/COPS/TRACKS campaign |
| VerfasserIn |
Linda Smoydzin, Holger Tost |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250055769
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| Zusammenfassung |
| We present a detailed analysis of the impact of convection on air quality and the redistribution
of trace gases within the vicinity of a severe storm. We use the WRF-chem model including
an aqueous phase chemistry mechanism for calculating explicitly the scavenging of trace
gases.
Deep convective clouds can have a major impact on atmospheric chemistry as they can
rapidly transport trace gases from the lower to the upper troposphere. At the same time,
highly soluble species are efficiently scavenged due to uptake on hydrometeors and
subsequent removal by precipitation. Furthermore, deep convection can influence
atmospheric chemistry by changing UV fluxes and thus photochemical reaction rates as well
as by the formation of NO molecules via lightning. All of these processes change chemical
reaction pathways in the troposphere.
As part of the HOOVER/COPS/TRACKS campaign aircraft measurements of trace gases
were made in the outflow region of a severe convective cell which developed ahead of a
frontal system over Germany on 19 July 2007. This case study is employed to investigate the
removal of pollutants from the atmosphere by scavenging processes. Furthermore, we focus
our case study on modifications of chemical reaction pathways in the upper troposphere due
to upward transport of boundary layer tracers as well as the release of trace gases such as
H2O2 from ice particles. |
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