Japan Geoscience Union Meeting 2015

Presentation information


Symbol A (Atmospheric and Hydrospheric Sciences) » A-AS Atmospheric Sciences, Meteorology & Atmospheric Environment

[A-AS22] Hyper-dense observation and forecast to elucidate micro-scale atmospheric phenomena

Mon. May 25, 2015 2:15 PM - 4:00 PM 301A (3F)

Convener:*Jun-ichi Furumoto(Research Institute for Sustainable Humanosphere, Kyoto University), Nobumitsu Tsunematsu(Tokyo Metropolitan Research Institute for Environmental Protection), Kentaro Araki(Forecast Research Department, Meteorological Research Institute, Japan Meteorological Agency), Chair:Nobumitsu Tsunematsu(Tokyo Metropolitan Research Institute for Environmental Protection)

3:15 PM - 3:30 PM

[AAS22-05] Multiscale factors causing climatological high temperature in Tajimi, the 'hottest city' in Japan

*Yuya TAKANE1, Hiroyuki KUSAKA2, Hiroaki KONDO1, Maki OKADA3, Shiori ABE3, Midori TAKAKI3, Kenji MIYAMOTO4, Yukino FUJI4, Toru NAGAI4 (1.National Institute of Advanced Industrial Science and Technology, 2.Center for Computational Sciences, University of Tsukuba, 3.Graduate School of Life and Environmental Sciences, University of Tsukuba, 4.Tajimi City Government)

Keywords:Extreme high temperature, Pressure pattern, Foehn, AMeDAS, Tajimi

In this study, multiscale climatological features of extreme high temperature (EHT) events in Japan's hottest city, Tajimi in Gifu Prefecture were investigated using observational data corrected by Japan Meteorological Agency (JMA) during past 23 years and original data observed by authors during three years. The results showed that the occurrence of a specific pressure pattern of 'WHALE' (tail of a whale)—the synoptic-scale factor—and the urbanisation of Tajimi (meso γ scale) are the background factors that lead to climatologically high temperatures in Tajimi. In addition, the high-temperatures in Tajimi are contributed by the foehn-like westerly airflow coming from the mountains located in the northwest/western side, which cover the inland part of the Nobi Plain (the meso β scale factor), and the location of Tajimi observation station established within the urban section (~ about 400 m2) of the city where high temperatures tend to be observed (the microscale factor). On the other hand, statistical analysis indicated the possibility that the small-scale basin effects and soil dryness around Tajimi City (the meso γ scale factors), which were proposed as other hypotheses, do not play a climatological role in the occurrence of the EHT events in Tajimi.