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Article Navigation >  Acta Oceanologica Sinica  > 2019  >  38(1): 13-21
GUO Jingsong, ZHANG Zhixin, XIA Changshui, GUO Binghuo. Seasonal characteristics and forcing mechanisms of the surface Kuroshio branch intrusion into the South China Sea[J]. Acta Oceanologica Sinica, 2019, 38(1): 13-21. doi: 10.1007/s13131-017-1132-x
Citation: GUO Jingsong, ZHANG Zhixin, XIA Changshui, GUO Binghuo. Seasonal characteristics and forcing mechanisms of the surface Kuroshio branch intrusion into the South China Sea[J]. Acta Oceanologica Sinica, 2019, 38(1): 13-21. doi: 10.1007/s13131-017-1132-x
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Seasonal characteristics and forcing mechanisms of the surface Kuroshio branch intrusion into the South China Sea

doi: 10.1007/s13131-017-1132-x

  • Key Laboratory of Marine Science and Numerical Modeling, First Institute of Oceanography, Ministry of Natural Resources, Qingdao 266061, China;Laboratory for Regional Oceanography and Numerical Modeling, Pilot National Laboratory of Marine Science and Technology (Qingdao), Qingdao 266061, China

  • Received Date: 2017-10-10
    Abstract
  • Using observational data of Argos satellite-tracked drifters from 1988 to 2012, we analyzed seasonal characteristics of the surface Kuroshio branch (KB) intrusion into the South China Sea (SCS). The analysis results are as follows. The surface KB originates from the southern Balintang Channel (BLTC) and Babuyan Channel (BBYC). It begins in late September, reaches peak strength in November-December, and declines at the end of March. The mean speed of drifters along the KB path during their traverse of the Luzon Strait (LS) was 43% faster than during the two days before entering the LS for the flow originating from the southern BLTC, but there was a 24% increase in speed for the flow from the BBYC. The observations show that in winter, monthly-mean sea-level anomalies (SLAs) were positive southwest of Taiwan Island and extended to the northern LS. The SLAs were negative northwest of Luzon Island and extended to the southern LS, which acted like a pump, forcing a part of Kuroshio water westward into the SCS. The condition under which the KB forms was solved by a set of simplified motion equations. The results indicate that whether the KB can form depends upon the sea-level gradient at the central LS and region to the west, as well as the location, speed and direction of Kuroshio surface water when it enters the LS.
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