１９９９年夏の関東地方におけるＳＰＭ低濃度現象の気象的要因

• 速水 洋

  電力中央研究所

• 内田 敬

  東京理科大学

• 桜井 達也

  酸性雨研究センター

• 藤田 慎一

  電力中央研究所 東京理科大学

• 三浦 和彦

  東京理科大学

書誌事項

タイトル別名

• Meteorological Factors Influencing Low-Concentration Episodes of Suspended Particulate Matter in Kanto in Summer of 1999

抄録

In Japan, the nation-wide annual-mean concentration of suspended particulate matter (SPM) dramatically decreased, and the achievement rate of the air quality standard of SPM was considerably improved in FY1999. This study shows the actual conditions and meteorological causes of the low concentration. The nation-wide monthlymean concentration of SPM was low in April, from June to August, and in February in FY 1999. In July and August, the SPM concentration was remarkably low in Kanto, where the SPM concentration was characterized with very low concentrations continuing for as long as a week or more. Meteorological factors were analyzed for the low concentrations in Kanto in July and August, 1999. On a monthly basis, these two months of 1999 were characterized by stronger wind speeds and more precipitation than the five years around 1999, which could be causes of the low concentration. In the very low concentration weeks, however, such low concentrations were related to the mostly constant wind direction, which brought maritime air from the Pacific Ocean.

収録刊行物

• 大気環境学会誌

  大気環境学会誌 40 (5), 193-200, 2005

  公益社団法人 大気環境学会

キーワード

• suspended particulate matter
• national air quality standard
• meteorological analysis
• trajectory analysis
• Pacific anticyclone

詳細情報

• CRID: 1390282679593314176
• NII論文ID: 130004377448
• DOI: 10.11298/taiki1995.40.5_193
• COI: 1:CAS:528:DC%2BD2MXhtVeqsbzF
• ISSN: 21854335
• ISSN: 13414178
• 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