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| Titel |
Transport and chemical conversion in convective boundary layer above complex terrain |
| VerfasserIn |
W. Wilms-Grabe, U. Corsmeier, W. Junkermann, Ch. Kottmeier, F. Holland, H. Geiss, B. Neininger |
| 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 |
250025742
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| Zusammenfassung |
| In summer 2007, the TRACKS campaign (Transport and Chemical Conversion in Convective
Systems) was carried out in southwestern Germany in order to study the transport of
atmospheric trace gases and aerosols under convective conditions. One focus of this
experiment was to investigate the dilution of air pollutants due to dynamical and chemical
processes above complex terrain. Therefore, the dispersion of the plume of a metropolitan
area has been detected by coordinated measurements of different airborne platforms,
including several aircraft and a zeppelin.
This contribution addresses the plume of the city of Karlsruhe on a summer day when a
convective boundary layer has developed. Karlsruhe is located in the upper Rhine valley
between the Palatine mountains and the Black Forest. The transport of air masses is deeply
influenced by this orographical situation. The case under investigation is characterized
by moderate convective conditions, a frequently occurring summer situation with
typical anthropogenic air pollution mainly resulting from traffic and industry. The
dispersion of the plume will be shown, mass fluxes are determined and relations between
meteorological conditions and trace gas concentrations inside and outside the plume will be
discussed.
The results reveal a distinctive lateral boundary of the plume. At a distance of 40 km
downstream the main emission area, the ozone concentration increased by about 10 ppb,
although NO2 does not show a clear horizontal gradient along the plume. In the afternoon, the
aerosol in the range of nanometers indicates an unusual growth in size with increasing
distance to the city area. |
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