Numerical Experiments on the Weak-Wind Region Formed Ahead of the Sea-Breeze Front

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概要

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• A weak-wind region, whose horizontal scale is comparable to that of an urban area, is occasionally formed ahead of the sea-breeze front, over a large coastal urban area (Yoshikado and Kondo 1989; Yoshikado 1990; Ohashi and Kida 2001). In this study, the characteristics and the formation mechanism of the weak-wind region were investigated, using a 2D mesoscale atmospheric model. The following results were obtained: The weak-wind region is created by the development of the heat-island circulation over the urban area; the heat-island circulation (i.e., the urbanward pressure-gradient-force) weakens the inlandward ambient wind during the morning hours. At that time, the sea-breeze circulation is inessential in creating this weak-wind region. The weak-wind region cannot be created under the influence of the seaward ambient wind. Subsequently, the weak-wind region is persistently formed ahead of the sea-breeze front, and gradually moves inlandward. A long-term balance between the urbanward pressure-gradient-force, and the turbulent mixing, causes such a phenomenon. Thus, interactions among the sea-breeze circulation, heat-island circulation, and inlandward ambient wind play an important role in the above processes. The spatial scale of the weak-wind region strongly depends on the urban size (width), i.e., the spatial scale of the heat-island circulation developing over the urban area, during the daytime hours.

• 社団法人日本気象学会の論文
• 2002-06-25

著者

• Kida H

  Kyoto Univ. Kyoto Jpn

• Kida Hideji

  Department Of Geophysics Faculty Of Science Kyoto University

• Kida Hideji

  Department Of Geophysics Graduate School Of Science Kyoto University

• Ohashi Yukitaka

  Department Of Geophysics Graduate School Of Science Kyoto University

• Ohashi Y

  Department Of Geophysics Graduate School Of Science Kyoto University

関連論文

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• Verification of the Climatic Features of a Regional Climate Model with BAIM
• Maintenance of Decadal SST Anomalies in the Midlatitude North Pacific
• A Numerical Study on the Detrainment of Tracers by Cumulus Convection in TOGA COARE
• Observational Results of the Sea Breeze with a Weak Wind Region over the Northern Osaka Urban Area
• Numerical Experiments on the Weak-Wind Region Formed Ahead of the Sea-Breeze Front

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