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| Titel |
Sensitivity of mesoscale model urban boundary layer meteorology to the scale of urban representation |
| VerfasserIn |
D. D. Flagg, P. A. Taylor |
| 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 ; 11, no. 6 ; Nr. 11, no. 6 (2011-03-30), S.2951-2972 |
| Datensatznummer |
250009532
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| Publikation (Nr.) |
 copernicus.org/acp-11-2951-2011.pdf |
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| Zusammenfassung |
| Mesoscale modeling of the urban boundary layer requires careful
parameterization of the surface due to its heterogeneous morphology. Model
estimated meteorological quantities, including the surface energy budget and
canopy layer variables, will respond accordingly to the scale of
representation. This study examines the sensitivity of the surface energy
balance, canopy layer and boundary layer meteorology to the scale of urban
surface representation in a real urban area (Detroit-Windsor
(USA-Canada)) during several dry, cloud-free summer periods. The model
used is the Weather Research and Forecasting (WRF) model with its coupled
single-layer urban canopy model. Some model verification is presented using
measurements from the Border Air Quality and Meteorology Study (BAQS-Met)
2007 field campaign and additional sources. Case studies span from
"neighborhood" (10 s ~308 m) to very coarse (120 s ~3.7 km)
resolution. Small changes in scale can affect the classification of the
surface, affecting both the local and grid-average meteorology. Results
indicate high sensitivity in turbulent latent heat flux from the natural
surface and sensible heat flux from the urban canopy. Small scale change is
also shown to delay timing of a lake-breeze front passage and can affect the
timing of local transition in static stability. |
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