Impact Assessment of Air Pollutants on the Formation of Summer Urban Heavy Rainfall: Utilization of Newly-developed Sequential Heavy Rain Collection System and Geographic Information System

DOI

Bibliographic Information

Other Title
  • 都市型豪雨生成に及ぼす大気汚染物質の影響評価―新規開発した分割型豪雨採取システムと地理情報システムの活用―

Description

<p>Urban heavy rains (UHR) during the summer were sequentially collected at Shinjuku by a newly-developed heavy rainwater collector. Geographical distributions of air pollutants just before UHR were also performed by a GIS in the 23 wards of Tokyo. The volume-weighted mean pH of UHR from 2012 to 2019 was 4.41 (n=16), which was lower than other types of rainfall. The total concentration of major inorganic ions in UHR was similar to that in normal rainfall and the sum of H+, NO3-, and SO42-accounted for 62.3% of UHR. Compared to typhoon heavy rain, these acidic components in UHR showed a gradual decrease in concentration during the first stage and nearly constant later. The wet deposition fluxes of H+, NO3-, and SO42- in UHR were 31, 20, and 15 times that in normal rainfall, respectively. A rader image analysis showed that UHR has three patterns, i.e. upper pattern, eastern pattern, and northwestern pattern. A highly concentrated area of PM2.5 was formed near the formation area of UHR, but it disappeared before UHR. This suggests that air pollutants were transported and accumulated in the formation area of UHR, and rose to the upper and pattern involved in formation and development of cumulonimbus clouds.</p>

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Details 詳細情報について

  • CRID
    1390285300156504320
  • NII Article ID
    130007840948
  • DOI
    10.11298/taiki.55.101
  • ISSN
    21854335
    13414178
  • Text Lang
    ja
  • Data Source
    • JaLC
    • CiNii Articles
  • Abstract License Flag
    Disallowed

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