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| Titel |
Convection parameterisation influences on trace species profiles |
| VerfasserIn |
H. Tost, P. Jöckel, M. G. Lawrence, C. Brühl, The GABRIEL Team, The SCOUT-O3 / ACTIVE / TWP-ICE Darwin -Team |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250028049
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| Zusammenfassung |
| Deep convective clouds are responsible for intense upward transport of air and consequently
of trace species into the upper troposphere, both in the tropics and the mid-latitudes. Since in
global atmospheric chemistry general circulation models convection must be parameterised,
this is a large source of uncertainty.
In this study a comparison between model simulations using the EMAC (ECHAM5/MESSy
atmospheric chemistry) model, which is equipped with several different convection
parameterisations, and observed data from measurement campaigns is performed. This allows
the analysis of the impact of convection on the vertical distribution of trace species in the
atmosphere and elucidates the differences in the applied convection schemes. Furthermore, it
helps to identify strengths and weaknesses of the individual parameterisations. Both the
triggering behaviour and the transport strength and form (e.g. entrainment profiles) contribute
to modified vertical tracer profiles. Furthermore, the scavenging and subsequent wet removal
processes are substantially influenced by the precipitation determined by the parameterised
convection. |
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