Japan Geoscience Union Meeting 2015

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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

Tue. May 26, 2015 9:00 AM - 10:45 AM 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:Kuniaki Higashi(Research Institute for Sustainable Humanosphere, Kyoto University)

10:00 AM - 10:15 AM

[AAS22-18] Elucidation of the mechanism of the downstream gust wind using high resolution weather model

*Kuniaki HIGASHI1, Jun-ichi FURUMOTO1, Hiroto SAKAMOTO1 (1.Research Institute for Sustainable Humanosphere, Kyoto University)

Keywords:downslope wind, gust wind, microscale weather, atmospheric boundary layer, weather simulation

This study aims to elucidate the mechanism of the downstream gust-wind blowing from the Hira mountain range to the Lake Biwa in the 10 km-range by using 200 m horizontal-resolution dense non-hydrostatic forecast model. The results of dense in-situ measurement clearly shows this gust wind, called as Hira Oroshi (HO), has very unique characteristics that the location and of gust and period of gust wind varies in each case. Considering that this complex feature of HO has not fully elucidated, this study conducted a long-term simulation in the HO region during October, 2013 and March, 2014. In-situ measurement detected 17 HO event, which is also successfully reproduced by the results of our simulation. The common line shape structure, which causes the gust wind in the West coastline of Lake Biwa, is clarified.