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| Titel |
Evaluation of urban surface parameterizations in the WRF model using measurements during the Texas Air Quality Study 2006 field campaign |
| VerfasserIn |
S.-H. Lee, S.-W. Kim, W. M. Angevine, L. Bianco, S. A. McKeen, C. J. Senff, M. Trainer, S. C. Tucker, R. J. Zamora |
| 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. 5 ; Nr. 11, no. 5 (2011-03-09), S.2127-2143 |
| Datensatznummer |
250009451
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| Publikation (Nr.) |
 copernicus.org/acp-11-2127-2011.pdf |
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| Zusammenfassung |
| The performance of different urban surface parameterizations in the WRF
(Weather Research and Forecasting) in simulating urban boundary layer (UBL)
was investigated using extensive measurements during the Texas Air Quality
Study 2006 field campaign. The extensive field measurements collected on
surface (meteorological, wind profiler, energy balance flux) sites, a
research aircraft, and a research vessel characterized 3-dimensional
atmospheric boundary layer structures over the Houston-Galveston Bay area,
providing a unique opportunity for the evaluation of the physical
parameterizations. The model simulations were performed over the Houston
metropolitan area for a summertime period (12–17 August) using a bulk urban
parameterization in the Noah land surface model (original LSM), a modified
LSM, and a single-layer urban canopy model (UCM). The UCM simulation
compared quite well with the observations over the Houston urban areas,
reducing the systematic model biases in the original LSM simulation by
1–2 °C in near-surface air temperature and by 200–400 m in UBL height,
on average. A more realistic turbulent (sensible and latent heat) energy
partitioning contributed to the improvements in the UCM simulation. The
original LSM significantly overestimated the sensible heat flux (~200 W m−2)
over the urban areas, resulting in warmer and higher UBL. The
modified LSM slightly reduced warm and high biases in near-surface air
temperature (0.5–1 °C) and UBL height (~100 m) as a result of the
effects of urban vegetation. The relatively strong thermal contrast between
the Houston area and the water bodies (Galveston Bay and the Gulf of Mexico)
in the LSM simulations enhanced the sea/bay breezes, but the model
performance in predicting local wind fields was similar among the
simulations in terms of statistical evaluations. These results suggest that
a proper surface representation (e.g. urban vegetation, surface morphology)
and explicit parameterizations of urban physical processes are required for
accurate urban atmospheric numerical modeling. |
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