Analysis of temperature and wind distribution using high-resolution data in Kanto Plain on August 16, 2007
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概要
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The Automated Meteorological Data Acquisition System (AMeDAS) stations that observed the daily maximum temperature on August 16, 2007, to be approximately 40℃ were limited to the northern Kanto Plain. However, numerical studies (Watarai et al. 2009; Shinohara et al. 2009) indicated that the high-temperature area was located at the boundary between Saitama Prefecture and the Tokyo Metropolis. To verify the existence of an area of elevated temperature that was identified by the numerical study, this study analyzed the temperature distributions in the Kanto Plain using high-density temperature data (E-METROS). A boundary between the southerly and northerly winds was located in the southern Saitama Prefecture, and the temperature was elevated just north of this boundary. According to the E-METROS network, the area where the daily maximum temperature exceeded 40℃ was located near Kumagaya and the central Kanto Plain. Thus, the spatial scale of this area was somewhat smaller than that of the area observed by the AMeDAS stations. It is thought that this elevated temperature was influenced by the sea-breeze front that merged at the boundary between the northerly and southerly winds at 14:00 Japan Standard Time (JST). The convergence also became strong near the boundary. Because the convergence strengthened, down flow in front of the sea-breeze front may also have strengthened. The high-temperature area located at the central Kanto Plain may have been caused by enhanced downward flow in front of the sea-breeze front.
- 2011-00-00
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