Outflow patterns of pollutants from East Asia to the North Pacific in the winter monsoon

Naoki Kaneyasu, Koji Takeuchi, Masayasu Hayashi, Shin Ichi Fujita, Itsushi Uno, Hidetaka Sasaki

研究成果: ジャーナルへの寄稿記事

48 引用 (Scopus)

抄録

Outflow patterns of air pollutants, and mechanisms associated with a "monsoon" condition that is peculiar to the East Asian region in winter, have been studied. To capture the continental outflow, airborne and shipboard measurements of aerosols and trace gases were conducted over the northern part of the East China Sea and the western part of the Sea of Japan on January 17-26, 1991 (airborne), January 28-29, 1992 (airborne), January 22-31, 1993 (shipboard), and January 29-30, 1993 (airborne). At least two types of highly polluted air masses were found at different times of the monsoon. Type 1 polluted air mass, which contained more than 10 μg m-3 of non-sea-salt SO42- and more than 5 μgC m-3 of black carbon aerosols, typically appeared over the East China Sea at the beginning of the monsoon period. Chemical and microphysical characteristics suggest that the type 1 polluted air mass is chemically aged. Type 2 air mass appeared in the later half of the monsoon period and had characteristics of freshly emitted pollutants. It consisted of several high concentrations of SO2 (>10 ppbv) confined in narrow horizontal width (10 to 30 km wide). Analyses using an Eulerian chemical transport model and detailed backward trajectories indicate that the type 1 polluted air mass was subcontinental in extent and its formation and the transport were dominated by a synoptic-scale weather cycle; it was formed over the Asian continent under anticyclonic conditions that persisted for 3-4 days, and transported intermittently to the east over the Pacific Ocean by the passage and the development of traveling cyclones. This study suggests that aerosols that flow out from East Asia are enriched with carbonaceous materials and consequently have low single-scattering albedo, which may affect the direct radiative forcing by aerosols over the North Pacific.

元の言語英語
記事番号2000JD900138
ページ(範囲)17361-17377
ページ数17
ジャーナルJournal of Geophysical Research Atmospheres
105
発行部数D13
DOI
出版物ステータス出版済み - 7 16 2000

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monsoons
air masses
East Asia
air mass
winter
contaminants
Aerosols
monsoon
outflow
pollutants
aerosols
air
pollutant
aerosol
Air
East China Sea
China
Sea of Japan
Soot
carbonaceous materials

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

これを引用

Kaneyasu, N., Takeuchi, K., Hayashi, M., Fujita, S. I., Uno, I., & Sasaki, H. (2000). Outflow patterns of pollutants from East Asia to the North Pacific in the winter monsoon. Journal of Geophysical Research Atmospheres, 105(D13), 17361-17377. [2000JD900138]. https://doi.org/10.1029/2000JD900138

Outflow patterns of pollutants from East Asia to the North Pacific in the winter monsoon. / Kaneyasu, Naoki; Takeuchi, Koji; Hayashi, Masayasu; Fujita, Shin Ichi; Uno, Itsushi; Sasaki, Hidetaka.

:: Journal of Geophysical Research Atmospheres, 巻 105, 番号 D13, 2000JD900138, 16.07.2000, p. 17361-17377.

研究成果: ジャーナルへの寄稿記事

Kaneyasu, N, Takeuchi, K, Hayashi, M, Fujita, SI, Uno, I & Sasaki, H 2000, 'Outflow patterns of pollutants from East Asia to the North Pacific in the winter monsoon', Journal of Geophysical Research Atmospheres, 巻. 105, 番号 D13, 2000JD900138, pp. 17361-17377. https://doi.org/10.1029/2000JD900138
Kaneyasu, Naoki ; Takeuchi, Koji ; Hayashi, Masayasu ; Fujita, Shin Ichi ; Uno, Itsushi ; Sasaki, Hidetaka. / Outflow patterns of pollutants from East Asia to the North Pacific in the winter monsoon. :: Journal of Geophysical Research Atmospheres. 2000 ; 巻 105, 番号 D13. pp. 17361-17377.
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