Impact of the Preceding El Nin^^-o on the East Asian Summer Atmosphere Circulation

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概要

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• This paper examines the relationship between the East Asian summer monsoon and the El Niio Southern oscillation (ENSO) during the period from 1958 to 1998, which is quite different from the link between the South Asian summer monsoon and ENSO. Major findings are: (1) A new index, called the East Asian Monsoon Index (EAMI), is defined for measurilng the East Asian monsoon, which could extensively describe the south-north distribution of the East Asian summer monsoons activity. The interannual variability of the EAMI displays a significant negative correlation with the broad-scale Asian monsoon index proposed by Webster and Yang (1992) from 1976 to 1998. (2) A significant positive correlaticn between the surnmer 500 hPa geopotential height 'anomalies and the NIN0-3 SST in the preceding fall and winter is found in the subtropical regions of East Asia and the western North Pacific, and in northeast Asia centered at 70°N, 137.5°E . A strong (weak) summer monsoon in the subtropical regions of East Asia tends to occur about two to three seasons after the NIN0-3 SST anomalies exceed 1.5℃ (drop below -O.7℃). (3) The above results suggest a delayed impact of the ENSO on the East Asian summer atmosphere circulation. During the summer after the El Niio reaches its mature phase, an anomalous blocking anticyclone tends to occur in northeat Asia. Meanwhile a subtropical high of the western North Pacific extends abnormally westward. This anomalous circulation pattern enhances the summer monsoon in subtropical East Asia. The abovementioned evolution of the circulation anomalies became more prominent in the uuprecedented '97/98 El Nino event, suggesting that the devastating 1998 flood in southern central China may be partially due to the delayed impact of the '97/98 EI Nino. The physical processes for the delayed impact besides the air-sea interaction in the tropical and sub-tropical western Pacific are discussed too.

• 社団法人日本気象学会の論文
• 2001-03-25

著者

• Wang Bin

  International Pacific Res. Center Univ. Of Hawaii

• Oh Jai-Ho

  Meteorological Research Institute, Korean Meteorological Administration

• Oh Jai-ho

  Meteorologieal Research Institute

• Wang Yafei

  Chinese Academy of Meteorological Scienees

• Wang Bin

  International Pacific Researrch Center And Department Of Meteorology School Of Ocean And Earth Scien

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