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

DOI

Bibliographic Information

Other Title
  • 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

Description

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) NO2Prime (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 NOx-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.

Journal

Details 詳細情報について

  • CRID
    1390001204617278848
  • NII Article ID
    130003978127
  • DOI
    10.11298/taiki1978.29.2_80
  • COI
    1:CAS:528:DyaK2cXksVWltr0%3D
  • ISSN
    21863695
    03867064
  • Data Source
    • JaLC
    • CiNii Articles
  • Abstract License Flag
    Disallowed

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