Journal of Marine Sciences ›› 2018, Vol. 36 ›› Issue (1): 16-26.DOI: 10.3969/j.issn.1001-909X.2018.01.002

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Wyrtki Jet anomaly in May and its relationship with Asian tropical summer monsoon

ZHANG Dong-ling1, LU Xu2,3, ZHANG Ming*3   

  1. 1. Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China;
    2. Unit 32021 , P.L.A,Beijing 100094, China;
    3. Laboratory of Atmospheric Circulation and Short-range Climate Forecast,College of Meteorology and Oceanography, P.L.A. University of Science and Technology, Nanjing 211101, China
  • Received:2016-11-17 Revised:2017-09-18 Online:2018-03-15 Published:2022-11-21

Abstract: The Complex EOF (CEOF) analysis of the upper abnormal circulation of the tropical Indian Ocean in May was carried out based on 52 years Carton data. The inter-annual and inter-decadal variation of Wyrtki Jet, and the relationship between the Jet and the Asian tropical summer monsoon were presented. The main results show that the first mode could be called as Wyrtki Jet mode which reflected the general intensity of Wyrtki Jet in May of every year. The first mode had obvious inter-annual variation in every 8 years, which was consistent with one of the inter-annual variations of Asian summer monsoon. It also had obvious inter-decadal variations in every 17 and 23 years. The latter was consistent with the PDO period of the main climate mode in North Pacific. When the intensity of Wyrtki Jet was weaker, the estabishment data of the summer monsoon in South China Sea and South Asia was usually earlier, and the summer monsoon in South China Sea was most likely stronger, and vice versa. The second mode reflected the non-uniformity of Wyrtki Jet in the east and west directions of equatorial Indian Ocean. It had very obvious inter-decadal variations in every 11 and 18-19 years. The former was consistent with the period of NPGO of the secondary climate mode in North Pacific. The second mode also had inter-annual variation in every 5 years.

Key words: tropical Indian Ocean, Wyrtki Jet, inter-annual and inter-decadal variation, South China Sea summer monsoon, South Asian summer monsoon

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