The philippines-taiwan oscillation: Monsoonlike interannual oscillation of the subtropical-tropical western north pacific wind system and its impact on the ocean

Y. L. Chang, L. Y. Oey*

*此作品的通信作者

    研究成果: 雜誌貢獻期刊論文同行評審

    53 引文 斯高帕斯(Scopus)

    摘要

    Tide gauge and satellite data reveal an interannual oscillation of the ocean's thermoclines east of the Philippines and Taiwan, forced by a corresponding oscillation in the wind stress curl. This so-called Philippines-Taiwan Oscillation (PTO) is shown to control the interannual variability of the circulation of the subtropical and tropical western North Pacific. The PTO shares some characteristics of known Pacific indices, for example, Niño-3.4. However, unlike PTO, these other indices explain only portions of the western North Pacific circulation. The reason is because of the nonlinear nature of the forcing in which mesoscale (ocean) eddies play a crucial role. In years of positive PTO, the thermocline east of the Philippines rises while east of Taiwan it deepens. This results in a northward shift of the North Equatorial Current (NEC), increased vertical shear of the Subtropical Countercurrent (STCC)/NEC system, increased eddy activity dominated by warm eddies in the STCC, increased Kuroshio transport off the northeastern coast of Taiwan into the East China Sea, increased westward inflow through Luzon Strait into the South China Sea, and cyclonic circulation and low sea surface height anomalies in the South China Sea. The reverse applies in years of negative PTO.

    原文英語
    頁(從 - 到)1597-1618
    頁數22
    期刊Journal of Climate
    25
    發行號5
    DOIs
    出版狀態已發佈 - 2012 三月

    ASJC Scopus subject areas

    • 大氣科學

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