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首页> 外文期刊>Water, Air, and Soil Pollution >Study of the Relationship between Elevated Concentrations of Photochemical Oxidants and Prevailing Meteorological Conditions in the North Kanto Area, Japan
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Study of the Relationship between Elevated Concentrations of Photochemical Oxidants and Prevailing Meteorological Conditions in the North Kanto Area, Japan

机译：日本北关东地区光化学氧化剂浓度升高与普遍气象条件的关系研究

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摘要

Ambient concentrations of photochemical oxidants (Ox) averaged throughout all ambient monitoring stations in Japan have increased slightly during the past two decades despite decreasing emissions of oxidant precursors such as NOx and hydrocarbons. In the Kanto area of Japan, which is heavily populated and industrialized, Ox concentrations are often high, especially in late spring and summer, and a photochemical smog warning is frequently issued. Although the north Kanto area is about 150 km from the southern metropolitan area, and, moreover, local emissions of precursors are limited because of its agricultural and forested character, high Ox concentration levels (>120 ppbv (1-h average)) are often observed there. We analyzed the relationship between the occurrence of high Ox concentrations in the north Kanto and meteorological conditions. By combining the regional wind pattern and the presence of the inversion layer in the atmospheric boundary layer, we identified five distinct meteorological patterns. High Ox concentrations in the north Kanto area were associated with a southerly extended sea breeze accompanied by a subsidence inversion layer. We inferred that the transport of Ox from the southern urban area by southerly winds and restricted dispersion below the inversion layer can lead to high Ox concentrations in the north Kanto area. This meteorological condition is associated with the presence of a high pressure system centered in the southeastern or eastern sector offshore of the Kanto area. Thus, Ox concentrations in the north Kanto area, where emissions of precursors are relatively low, can easily increase to very high levels under favorable meteorological conditions.
机译：在日本所有环境监测站中，平均的光化学氧化剂（Ox）浓度在过去二十年中略有增加，尽管氧化剂前体（如NOx和碳氢化合物）的排放量有所减少。在人口稠密和工业化的日本关东地区，氧气浓度通常很高，尤其是在春季和夏季末，并且经常发出光化学烟雾警告。尽管北关东地区距离南部都市区约150公里，此外，由于其农业和森林特征，当地前体的排放受到限制，但高氧浓度水平（> 120 ppbv（平均1-h）经常出现在那里观察。我们分析了关东北部高氧含量的发生与气象条件之间的关系。通过组合区域风型和大气边界层中反演层的存在，我们确定了五种不同的气象模式。关东北部地区高浓度的氧气与南风向南延伸并伴有沉陷反演层有关。我们推断，南方风向南部城市地区输送的Ox和反转层下方的受限弥散会导致Kanto北部地区的Ox浓度较高。这种气象条件与高压系统的存在有关，高压系统的中心位于关东地区的东南或东部。因此，在有利的气象条件下，关东地区北部的前者排放量相对较低的氧气浓度很容易增加到很高的水平。

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  • 来源
    《Water, Air, and Soil Pollution》 |2011年第4期|p.105-116|共12页
  • 作者

    Shinri Hosoi; Hiroshi Yoshikado; George Gaidajis; Kazuhiko Sakamoto;

  • 作者单位

    Department of Environmental Science & Technology, Graduate School of Science & Engineering, Saitama University, 255 Shimo-Okubo, Sakura, Saitama 338-8570, Japan;

    Department of Environmental Science & Technology, Graduate School of Science & Engineering, Saitama University, 255 Shimo-Okubo, Sakura, Saitama 338-8570, Japan,Institute for Environmental Science and Engineering, Saitama University, 255 Shimo-Okubo, Sakura, Saitama 338-8570, Japan;

    Department of Production Engineering & Management, School of Engineering, Democritus University of Thrace, Xanthi 67100, Greece;

    Department of Environmental Science & Technology, Graduate School of Science & Engineering, Saitama University, 255 Shimo-Okubo, Sakura, Saitama 338-8570, Japan,Institute for Environmental Science and Engineering, Saitama University, 255 Shimo-Okubo, Sakura, Saitama 338-8570, Japan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    oxidants; the north kanto; meteorological conditions; inversion layer; extended sea breeze;

    机译：氧化剂北关东气象条件;逆温层;持续的海风;

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