梅雨期の広域的なSPM高濃度出現をもたらす気象的要因 : 1997年7月の事例解析

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Pollution mechanism by Suspended Particulate Matter (SPM, atmospheric aerosols with diameter less than 10 μm) in rainy season in Japan was analyzed in the view of meteorology. A case study of a 1997 July event suggested the pollution mechanisms that when Baiu front (synoptic-scale stationary front which causes rainy season in East Asia) is located just south (within ∼ 200 km) of urban areas and stays for several days, air pollutants emitted from the ground sources are accumulated in the calm and thin (several hundreds of meters) layer of cold air mass which lies north of Baiu front. This mechanism was confirmed by the Lidar observation data at Tsukuba and SPM concentration data at elevated monitoring stations on Tokyo tower. Another possible mechanism is the formation of a stagnant-layer in the central-northern part of Kanto Plain when Baiu front is located far north (e.g. on the Japan Sea). This pattern occurs when the south coast of the mainland Japan is dominated by the relatively strong westerly wind that flows along the periphery of the north edge of North Pacific anticyclone where pressure gradient is relatively steep. Under this condition, high mountainous area, west of the plain, obstructs the westerly wind to form stagnant (calm) layer downwind. This is a topography-dependent phenomenon and resembles those of the stagnant layer accompanying the “Boso local front” in the Kanto Plain which causes severe air pollution in early-winter.
日本エアロゾル学会の論文
2005-12-20

梅雨期の広域的なSPM高濃度出現をもたらす気象的要因 : 1997年7月の事例解析

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