観測により捉えられた冬季光化学大気汚染: 関東平野における初冬季の高濃度NO<SUB>2</SUB>汚染の要因として

• 兼保 直樹

  National Institute for Resources and Environment

• 吉門 洋

  National Institute for Resources and Environment

• 水野 建樹

  National Institute for Resources and Environment

• 田中 敏之

  National Institute for Resources and Environment

• 坂本 和彦

  Saitama University

• 王 青躍

  Saitama University

• 早福 正孝

  Tokyo Metropolitan Research Institute for Environmental Protection

書誌事項

タイトル別名

• Wintertime Photochemical Air Pollution as a Cause of Heavy NO<SUB>2</SUB> Pollution in Kanto Plain, Japan

抄録

Field observations of wintertime photochemical pollution have been conducted in order to investigate the cause of severe NO₂ pollution that often occurs in early winter in the Kanto Plain, Japan. Intensive measurements of secondary photochemical products were carried out on November 26 and 27 and December 6 and 7, 1991, when high concentrations of NO₂ (>90 ppb) were observed. Sampling sites were located in the Metropolitan Tokyo area, as well as four sites at inland of the Kanto Plain, and a site at the top of Mt. Tsukuba (800 m height, 50 km northeast of Tokyo). During the intensive measurement period, daily maximum concentrations of peroxyacetylnitrate (PAN) were 3.9-11.7 ppb on the coast at Tokyo Bay; diurnal variation was similar to that of [PO (=NO₂+0₃) NO₂^Prime (primarily emitted NO₂)]. The diurnal variation of total inorganic nitrates concentrations showed a daytime maximum except on December 7; it reached an extremely high value (59 μg m^-3) on December 6. Acetaldehyde/CO ratio also showed remarkable daytime maxima on December 6 and 7. The behavior of photochemical products indicates that the NO_x-hydrocarbons system photochemical reactions were dominant during this period. In addition, shipboard measurements in Tokyo Bay suggested that PO is predominantly in the form of O₃ above Tokyo Bay, which is contrary to land-based measurements. The results of this study further suggest that the photochemical formation of nitrate is one of the causes of suspended particulate matter (SPM) pollution, which is often accompanied by high concentrations of NO₂.

収録刊行物

• 大気汚染学会誌

  大気汚染学会誌 29 (2), 80-91, 1994

  公益社団法人 大気環境学会

詳細情報

• CRID: 1390001204617278848
• NII論文ID: 130003978127
• DOI: 10.11298/taiki1978.29.2_80
• COI: 1:CAS:528:DyaK2cXksVWltr0%3D
• ISSN: 21863695
• ISSN: 03867064
• データソース種別:
  • JaLC
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可