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The 1997/ 98 ENSO Cycle and Its Impact on Summer Climate Anomalies in East Asia


doi: 10.1007/s00376-000-0028-3

  • The observed data of the sea surface temperature (SST) anomalies and the sea temperature (ST) in the sub-layer of the equatorial Pacific, the NCEP/ NCAR reanalysis data and the data set of daily precipita-tion in China are used to analyze the characteristics of the 1997 / 98 ENSO cycle and its impact on summer climate anomalies in East Asia. The results show that the 1997/ 98 ENSO cycle, the strongest one in the 20th century, might be characterized by rapid development and decay and eastward propagation from the West Pacific warm pool. Influenced by the ENSO cycle, in 1997, the serious drought and hot summer occur-red in North China, and in the summer of 1998, the severe floods occurred in the Yangtze River valley, especially in the Dongting Lake and Boyang Lake valleys, South Korea and Japan.The analysis also shows that: influenced by the 1997 / 98 ENSO cycle, the water vapor transportation by the Asian monsoon in the summer of 1997 was very different from that in the summer of 1998. In the summer of 1997, the water vapor transportation by the Asian summer monsoon was weak in North China and the northern part of the Korea Peninsula. Thus, it caused the drought and hot summer in North China. However, in the summer of 1998, the sea temperature in the sub-layer of the West Pacific warm pool drop?ped, the western Pacific subtropical high shifted southward. Thus, a large amount of water vapor was trans?ported from the Bay of Bengal, the South China Sea and the tropical western Pacific into the Yangtze River valley of China. South Korea and Japan, and the severe flood occurred there.
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Manuscript received: 10 September 2000
Manuscript revised: 10 September 2000
通讯作者: 陈斌, bchen63@163.com
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The 1997/ 98 ENSO Cycle and Its Impact on Summer Climate Anomalies in East Asia

  • 1. Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100080,Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100080,Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100080

Abstract: The observed data of the sea surface temperature (SST) anomalies and the sea temperature (ST) in the sub-layer of the equatorial Pacific, the NCEP/ NCAR reanalysis data and the data set of daily precipita-tion in China are used to analyze the characteristics of the 1997 / 98 ENSO cycle and its impact on summer climate anomalies in East Asia. The results show that the 1997/ 98 ENSO cycle, the strongest one in the 20th century, might be characterized by rapid development and decay and eastward propagation from the West Pacific warm pool. Influenced by the ENSO cycle, in 1997, the serious drought and hot summer occur-red in North China, and in the summer of 1998, the severe floods occurred in the Yangtze River valley, especially in the Dongting Lake and Boyang Lake valleys, South Korea and Japan.The analysis also shows that: influenced by the 1997 / 98 ENSO cycle, the water vapor transportation by the Asian monsoon in the summer of 1997 was very different from that in the summer of 1998. In the summer of 1997, the water vapor transportation by the Asian summer monsoon was weak in North China and the northern part of the Korea Peninsula. Thus, it caused the drought and hot summer in North China. However, in the summer of 1998, the sea temperature in the sub-layer of the West Pacific warm pool drop?ped, the western Pacific subtropical high shifted southward. Thus, a large amount of water vapor was trans?ported from the Bay of Bengal, the South China Sea and the tropical western Pacific into the Yangtze River valley of China. South Korea and Japan, and the severe flood occurred there.

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