Variations of NO<SUB>2</SUB> in winter and summer in Ise Bay area

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  • PARK Hye-Sook
    Faculty of Humanity and Social Science, Mie University
  • NAGAYA Y.
    Faculty of Bioresources, Mie University
  • MEZAKI S.
    Faculty of Business Administration, Nanzan University
  • TANAKA H.
    Institute of Geoscience, The University of Tsukuba

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Other Title
  • 伊勢湾地域における二酸化窒素(NO<SUB>2</SUB>)濃度の冬と夏の特性
  • 伊勢湾地域における二酸化窒素(NO2)濃度の冬と夏の特性
  • イセワン チイキ ニ オケル 2サンカ チッソ NO2 ノウド ノ フユ ト ナツ ノ トクセイ

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Abstract

This study covers research on the simultaneous measurement of NO2 concentration conducted at 195 sites in the Ise Bay area of Mie, Aichi, and Gifu prefectures. The research was conducted over two seasons, winter of 1997 (January 16th-17th) and summer of 1998 (July 15th-16th). Due to our grasp of the wind trajectory and the area of divergence, we were able to analyze the effects of land and sea breezes on the source of pollution, transportation, stagnation, and geographic features (topography). The area of divergence is closely related to the topography and sea breezes. In the Ise Bay area the sea breezes diverge at the base of inland mountainous areas. In short, we now understand that the divergence area is created between the valleys and the bottom of the inland mountainous areas that serve as the pathway for the inland penetration of the sea breezes. In addition to the Ise Bay area, we also have a good grasp of the area of divergence covering Mie Prefecture from the Ise Plain to the Suzuka Mountain Range, Nobi Plain, Yoro Mountains, Ibuki Mountains, Minomikawa High Lands. The research shows that areas with a high concentration of NO2 pollution include Nagoya City, Yokkaichi City, Kuwana City, Kagamigahara City and Tajimi City. According to the analysis of the wind trajectory and our calculation of divergence by Tanaka and Milkovich method, we were able to estimate the source of the pollution, transport route, and the area of stagnation. The reason for the high concentration of pollution in Kagamigahara City and Tajimi City, which are not big cities or industrial areas, is that Kagamigahara City is in the path of the Southwest winds from Yokkaichi City and Kuwana City, while Tajimi City is in the path of the South-south-west wind from Yokkaichi City and Kuwana City, that passes through Nagoya City. The evening and midnight to early morning winds that blow through the cities, industrial areas, and roads are carried by the sea breezes, and delivered to the inland areas. Daytime winds carry less pollution, while at night, Yokkaichi City produces NO2, and that NO2 is carried on the winds to be deposited at the divergence spots where the winds stagnate.

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