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Typhoon-induced ocean responses off the southwest coast of Taiwan

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Abstract

Typhoons can cause substantial sea surface cooling (typically 2–4 °C), which is usually biased to the right side of the storm track. Under influence of the complex bathymetry of the southern Taiwan Strait (TS), two types of sea surface temperature (SST) response, cooling and warming, each associated with a different type of typhoon track were identified using satellite and mooring observations. When a typhoon moved westward (or northwestward) and passed through the TS (track A), the SST cooling in the TS was biased toward the left of the storm track. Numerical model results indicated that in track A, strong wind stress accelerates the flow east of the Taiwan Banks and drove the bottom flow to uplift due to the topography. Moreover, both wind stress and wind stress curl enhanced the Luzon loop. After the typhoon passed, the mean circulation was modified around strong cooling in the southern TS, causing more South China Sea surface water to be distributed to the Kuroshio region. However, when a typhoon moved westward (or northwestward) and passed south of the TS, SST warming was induced in the southern TS (track B). The model results indicated that when the typhoon passed to the south of the TS, the typhoon-induced horizontal divergent flow travelled to the north, where it encountered the shallower shelf of the TS that was confined to the water, causing warm water transported into this area to accumulate and downwelling to occur. This can be regarded as redistributing the heat content in the shelf area. After the typhoon, the thickened mixed layer resulting from downwelling prevented the formation of near-inertial waves and reduced the vertical mixing.

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This study was part of the Taiwan integrated research program on Climate Change Adaptation Technology (TaiCCAT), sponsored by grants from the National Science Council of Taiwan, NSC101-2625-M-019-006 and 102-2811-M-019-001. TMI and AMSR-E data are produced by Remote Sensing Systems and sponsored by the NASA Earth Science MEaSUREs DISCOVER Project and the AMSR-E Science Team. Data are available at www.remss.com. ECMWF data used in this study have been obtained from the ECMWF Data Server. The TOPO5 data base (Data Announcement 88-MGG-02, Digital relief of the Surface of the Earth. NOAA, National Geophysical Data Center, Boulder, Colorado, 1988.) is available at NOAA/NGDC, http://www.ngdc.noaa.gov/mgg/global/etopo5.HTML

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Correspondence to Yi-Chun Kuo.

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Responsible Editor: Jin-Song von Storch

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Kuo, YC., Lee, MA. & Chern, CS. Typhoon-induced ocean responses off the southwest coast of Taiwan. Ocean Dynamics 64, 1569–1581 (2014). https://doi.org/10.1007/s10236-014-0776-8

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