Remote response of the East Asian winter monsoon to tropical forcing related to El Niño-Southern Oscillation

Kumi Sakai, Ryuichi Kawamura

研究成果: ジャーナルへの寄稿学術誌査読

59 被引用数 (Scopus)


The mechanism of the East Asian winter monsoon variability in response to El Niño-Southern Oscillation (ENSO)-related tropical forcing is investigated using Japanese long-term reanalysis project data, additionally aided by the Japan Meteorological Agency climate data assimilation system. There are at least two different responses, zonally symmetric and asymmetric, of the Asian jet over South Asia to the ENSO-related tropical convective forcing during the Northern Hemisphere winter. The zonally symmetric response, induced by zonally extended anomalous convection from the Philippine Sea through southern India and Sri Lanka, is pronounced at the mature phase of ENSO. The zonally asymmetric response is intimately associated with anomalous convection localized in the vicinity of the Philippine and South China seas, accompanied by an anomalous Walker circulation cell between the Maritime Continent and tropical Indian Ocean. When this asymmetric response is prominent, ENSO-related anomalous convection can give rise to a change in the East Asian winter monsoon system .through stationary Rossby wave propagation along the South Asian waveguide. The North Atlantic Oscillation (NAO)-related extratropical forcing is also a crucial factor and contributes not only to the downstream development of subpolar teleconnections across northern Eurasia but also to the reinforcement of the zonally asymmetric pattern of the Asian jet over South Asia, resulting in a significant effect on the East Asian winter monsoon circulation. A combination of the ENSO- and NAO-related forcing plays a vital role in triggering the occurrence of extraordinary anomalous monsoon circulations, such as extremely heavy snowfall in the 2005/2006 winter in Japan.

ジャーナルJournal of Geophysical Research Atmospheres
出版ステータス出版済み - 3月 27 2009

!!!All Science Journal Classification (ASJC) codes

  • 地球物理学
  • 林業
  • 海洋学
  • 水圏科学
  • 生態学
  • 水の科学と技術
  • 土壌科学
  • 地球化学および岩石学
  • 地表過程
  • 大気科学
  • 地球惑星科学(その他)
  • 宇宙惑星科学
  • 古生物学


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