Journal of Geophysical Research: Oceans

Observed near-surface flows under all tropical cyclone intensity levels using drifters in the northwestern Pacific

Authors

  • Yu-Chia Chang,

    1. Institute of Applied Marine Physics and Undersea Technology, National Sun Yat-Sen University, Kaohsiung, Taiwan
    2. Asia-Pacific Ocean Research Center, National Sun Yat-Sen University, Kaohsiung, Taiwan
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  • Guan-Yu Chen,

    Corresponding author
    1. Asia-Pacific Ocean Research Center, National Sun Yat-Sen University, Kaohsiung, Taiwan
    • Institute of Applied Marine Physics and Undersea Technology, National Sun Yat-Sen University, Kaohsiung, Taiwan
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  • Ruo-Shan Tseng,

    1. Institute of Applied Marine Physics and Undersea Technology, National Sun Yat-Sen University, Kaohsiung, Taiwan
    2. Asia-Pacific Ocean Research Center, National Sun Yat-Sen University, Kaohsiung, Taiwan
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  • Luca R. Centurioni,

    1. Scripps Institution of Oceanography, University of California San Diego, La Jolla, California, USA
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  • Peter C. Chu

    1. Naval Ocean Analysis and Prediction Laboratory, Department of Oceanography, Naval Postgraduate School, Monterey, California, USA
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Corresponding author: G.-Y. Chen, Institute of Applied Marine Physics and Undersea Technology, National Sun Yat-Sen University, Kaohsiung 804, Taiwan. (guanyu@faculty.nsysu.edu.tw)

Abstract

[1] Data from drifters of the surface velocity program and tropical cyclones (TCs) of the Joint Typhoon Warning Center during 1985–2009 were analyzed to demonstrate strong currents under various storm intensities such as category-4 to −5, category-2 to −3, and tropical storm to category-1 TCs in the northwestern Pacific. Current speeds over 2.0 m s−1 are observed under major TCs with the strongest mean currents to the right of the storm track. This study provides the characterization of the near-surface velocity response to all recorded TCs, and agrees roughly with Geisler's theory (1970). Our observations also verify earlier modeling results of Price (1983).

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