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| Titel |
Modelling the Polar Summer Tropopause with CLaMS |
| VerfasserIn |
Gebhard Günther, Anke Roiger, Cornelius Schiller, Hans Schlager, Bärbel Vogel, Jens-Uwe Grooß |
| Konferenz |
EGU General Assembly 2010
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 12 (2010) |
| Datensatznummer |
250040434
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| Zusammenfassung |
| In the frame of the International Polar Year 2008 the POLARCAT-GRACE (Polar Study
using Aircraft, Remote Sensing, Surface Measurements and Models, of Climate, Chemistry,
Aerosols, and Transport: Greenland Aerosol and Chemistry Experiment) has been
carried out from Kangerlussuaq, Greenland. The main focus of this campaign was on
surveying the Arctic summer tropopause as well as on detecting and probing forest fire
plumes from Siberia and Canada. During the campaign observations of several
atmospheric components like ozone, water vapour, nitrous oxide and aerosol were
obtained.
Model simulations with the Chemical Lagrangian Model of the Stratosphere (CLaMS)
are used for interpretation of observational data. Utilization of a suite of inert tracers
initialized with origins of air masses with respect to Potential Vorticity and geographical
position as well as tracers marking forest fire and pollution plumes give insight into
the influence of transport processes on the Arctic upper troposphere and lower
stratosphere.
Model results show a mixing layer below the thermally defined tropopause, consisting of
shallow structures of mixed-in formerly stratospheric air, possibly being remnants of
stratospheric intrusions, as well as upper level isentropic transport of tropospheric air of
subtropical origin into the stratosphere.
Additionally tropospheric influence from East Asian pollution on the lowermost
stratosphere triggered by special meteorological conditions is visible in the model results, in
good agreement with observations. |
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