Numerical Simulation of Urban Heat Island Effect by the WRF Model with 4-km Grid Increment: An Inter-Comparison Study between the Urban Canopy Model and Slab Model
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- KUSAKA Hiroyuki
- Center for Computational Sciences, University of Tsukuba
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- CHEN Fei
- National Center for Atmospheric Research
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- TEWARI Mukul
- National Center for Atmospheric Research
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- DUDHIA Jimy
- National Center for Atmospheric Research
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- GILL David O.
- National Center for Atmospheric Research
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- DUDA Michael G.
- National Center for Atmospheric Research
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- WANG Wei
- National Center for Atmospheric Research
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- MIYA Yukako
- Graduate School of Life and Environmental Sciences, University of Tsukuba
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Abstract
The present study applies the WRF model involving the single-layer urban canopy model (hereafter, WRF_UCM) to urban climate simulation of the Tokyo metropolitan area for August (2004-2007) and compare results to (a) observations, and (b) the WRF model involving the slab urban model (hereafter, WRF_SLAB). In this urban area, WRF_UCM accurately captures the observed monthly mean daytime and nocturnal UHI, whereas WRF_SLAB does not show a nocturnal UHI. Moreover, the observed diurnal variations of the surface air temperature for central Tokyo and Kumagaya, a nearby inland city, are reproduced well by WRF_UCM. However, WRF_SLAB exhibits both a 1-hr phase shift and a 6.2°C excess oscillation magnitude over observations. In addition, WRF_UCM accurately reproduces the frequency distribution of surface air temperatures, showing a maximum at 27°C, whereas WRF_SLAB produce a bimodal distribution, with double peaks at 23 and 33°C. Finally, WRF_UCM does a much better job than WRF_SLAB at modeling the relative humidity.
Journal
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- Journal of the Meteorological Society of Japan. Ser. II
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Journal of the Meteorological Society of Japan. Ser. II 90B (0), 33-45, 2012
Meteorological Society of Japan
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Details 詳細情報について
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- CRID
- 1390001206503529984
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- NII Article ID
- 130004435205
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- NII Book ID
- AA00702524
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- ISSN
- 21869057
- 00261165
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- HANDLE
- 2241/117403
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- NDL BIB ID
- 023556400
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- Text Lang
- en
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- Data Source
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- JaLC
- IRDB
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed