東京都狛江市における降水組成の経年変化

DOI

書誌事項

タイトル別名
  • Long Term Trend in the Chemical Composition of Precipitation at Komae, Tokyo

抄録

The Central Research Institute of Electric Power Industry (CRIEPI) constructed a nationwide monitoring network to survey acidic deposition in Japan in October 1987. Although the monitoring network was closed in September 1996, monitoring at Komae, Tokyo has been continued over than last two decades. On the basis of the monitoring data collected between October 1987 and September 2010, we analyzed (i) long term trend in the chemical composition of precipitation, (ii) effect of precipitation amounts on the seasonal variation of concentrations, and (iii) influence of changes in precursor′s emissions on precipitation quality in the metropolitan area.<BR>The equivalent ratio of non sea-salt sulfate to nitrate in precipitation significantly increased by 88% during the period from 1987 to 1999, suddenly decreased in the summer of 2000, and did not change during the period from 2002 to 2010. The equivalent ratio of sulfate, nitrate, and chloride to total non sea-salt anion were 31: 53: 16 for the end of 1980′s, 48: 44: 8 for the end of 1990′s, and 40: 56: 4 for the end of 2000′s, respectively. There was a strong effect of precipitation amounts on monthly concentrations of sulfate and nitrate in the warm season. Eruption of Miyake-jima volcano impacted concentrations of sulfate and chloride during the period from 2000 to 2001. The decrease in the concentration of chloride was considered to be related the reduction in hydrochloric acid emissions from industrial waste incinerators in the metropolitan area.

収録刊行物

キーワード

詳細情報 詳細情報について

  • CRID
    1390282679398641408
  • NII論文ID
    130004554181
  • DOI
    10.11353/sesj.25.26
  • ISSN
    18845029
    09150048
  • 本文言語コード
    ja
  • 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

問題の指摘

ページトップへ