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| Titel |
Validation of Martilli's urban boundary layer scheme with measurements from two mid-latitude European cities |
| VerfasserIn |
R. Hamdi, G. Schayes |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 7, no. 17 ; Nr. 7, no. 17 (2007-08-31), S.4513-4526 |
| Datensatznummer |
250005180
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| Publikation (Nr.) |
 copernicus.org/acp-7-4513-2007.pdf |
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| Zusammenfassung |
| Martilli's urban parameterization scheme is improved and implemented in a
mesoscale model in order to take into account the typical effects of a real
city on the air temperature near the ground and on the surface exchange
fluxes. The mesoscale model is run on a single column using atmospheric data
and radiation recorded above roof level as forcing. Here, the authors
validate Martilli's urban boundary layer scheme using measurements from two
mid-latitude European cities: Basel, Switzerland and Marseilles, France. For
Basel, the model performance is evaluated with observations of canyon
temperature, surface radiation, and energy balance fluxes obtained during
the Basel urban boundary layer experiment (BUBBLE). The results show that
the urban parameterization scheme represents correctly most of the behavior
of the fluxes typical of the city center of Basel, including the large heat
uptake by the urban fabric and the positive sensible heat flux at night. For
Marseilles, the model performance is evaluated with observations of surface
temperature, canyon temperature, surface radiation, and energy balance
fluxes collected during the field experiments to constrain models of
atmospheric pollution and transport of emissions (ESCOMPTE) and its urban
boundary layer (UBL) campaign. At both urban sites, vegetation cover is less
than 20%, therefore, particular attention was directed to the ability of
Martilli's urban boundary layer scheme to reproduce the observations for the
Marseilles city center, where the urban parameters and the synoptic forcing
are totally different from Basel. Evaluation of the model with wall, road,
and roof surface temperatures gave good results. The model correctly
simulates the net radiation, canyon temperature, and the partitioning
between the turbulent and storage heat fluxes. |
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