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Ocean Dynamics

, Volume 61, Issue 11, pp 1783–1795 | Cite as

Numerical study of upper ocean response to a typhoon moving zonally across the Luzon Strait

  • Yi-Chun Kuo
  • Ching-Sheng ChernEmail author
  • Joe Wang
  • Ya-Ling Tsai
Article

Abstract

The Luzon Strait (LS) is a wide channel between Taiwan and the Luzon islands. Eastward of the LS, the Kuroshio Current (KC) flows northward along the eastern coasts of Luzon and Taiwan. A typhoon is a strong and localized low-pressure weather system that occurs frequently in the vicinity of the Taiwan area. One typical typhoon track, passing through the seas surrounding Taiwan, is a zonal path across the LS. The satellite measured SST, corresponding to typhoons Pabuk (5 Aug. 2007–12 Aug. 2007) and Dujuan (29 Aug. 2003–5 Sep. 2003), which both moved along this path, demonstrated that a classic right bias cooling occurs to the north of the storm track, during the typhoon forced period. However, some cold anomaly water also present toward left (south) of the storm track east of the LS in the relaxation period. This paper adopted a three-dimensional hydrostatic primitive equation model to study the possible causes of this southward transport of cold waters. Both model results and the observed SST anomaly revealed that the strength of the upper ocean cooling depends on whether a resonant regime between the typhoon winds and the near-inertial currents can be excited. To the east of the LS, the convergence between the warm Kuroshio water and the cold wakes in the poststorm period will enhance the southward spreading of cold anomaly water. The enhanced vertical mixing, induced by the southward propagation of nearly inertial waves associated with the cold wakes, can also produce some cold anomaly to the south of a storm track in the poststorm period. Both mechanisms can contribute to the occurrence of some cold anomaly water to the south of the storm track east of the KC. To the west of the LS, the convergence between the warm Kuroshio water and the cold upwelling water from the northern South China Sea can further strengthen the Kuroshio front in the LS.

Keywords

Luzon Strait Kuroshio Typhoon Ocean response 

Notes

Acknowledgements

The National Science Council of Taiwan funded this study under grant NSC98-2611-M-002-015-MY3. The ECMWF model wind data were provided by the Databank of the Institute of Atmospheric Sciences, National Taiwan University.

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Yi-Chun Kuo
    • 1
  • Ching-Sheng Chern
    • 1
    Email author
  • Joe Wang
    • 1
  • Ya-Ling Tsai
    • 1
  1. 1.Institute of OceanographyNational Taiwan UniversityTaipeiRepublic of China

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