Meteorological Condition of Extremely High Concentration of Suspended Particulates in Early Winter in Kanto Plain
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概要
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Meteorological condition when suspended particulates (SP) increase to extremely high level in early winter were investigated using data obtained at many air pollution monitoring stations in Kanto district, AMeDAS, radio-sonde (Aerological) data at Tsukuba and weather maps.<BR>Usually, 1-day average SP concentration varies similarly in the wide area of Kanto Plain and increases from the rear part of moving anticyclone to the trough of air pressure, where air temperature at higher altitude of 900 mb (-4000 m) is increasing or near the peak. In the rear part of anticyclone, high concentration occurs from the evening to the morning during night when surface wind becomes weak and land breeze bows to Tokyo Bay. In the trough of air pressure, SP concentration sometimes increases even during the daytime. When Kanto plain comes in a warm region of the cyclone passing in the northern part of Japan, geostrophic wind from SW-, -WSW prevails and a local front is often formed across Tokyo bay in the direction of WSW to ENE, SP concentrations become extremely high in the northern area of this local front, where a strong inversion layer or a stagnant region is formed. This local front could be held for more than 1 day, though it becomes weaker in daytime and stronger at night.<BR>In this weather condition, SP/NO<SUB>x</SUB> (where NO<SUB>x</SUB> is nitrogen oxide concentration) and relative humidity of the air increase at the same time. Thus the effect of water in the air should be large on SP concentration.
- 社団法人 大気環境学会の論文
社団法人 大気環境学会 | 論文
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