Observation of continental shelf wave propagating along the eastern Taiwan Strait during Typhoon Meranti 2016 -- Journal of Oceanology and Limnology,2021,39(1):45-55

	Cite this paper:
	Junqiang SHEN, Shanwu ZHANG, Junpeng ZHANG, Mingzhang ZENG, Wendong FANG. Observation of continental shelf wave propagating along the eastern Taiwan Strait during Typhoon Meranti 2016[J]. Journal of Oceanology and Limnology, 2021, 39(1): 45-55

Observation of continental shelf wave propagating along the eastern Taiwan Strait during Typhoon Meranti 2016

Junqiang SHEN^1,2,3, Shanwu ZHANG², Junpeng ZHANG², Mingzhang ZENG², Wendong FANG¹

1 State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China;
2 Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China;
3 University of Chinese Academy of Sciences, Beijing 100049, China

Abstract:

This study is the first to depict typhoon-induced continental shelf wave (CSW) propagation in the eastern Taiwan Strait (TWS) during the passage of Typhoon Meranti in 2016 using tidal gauge data and along-track satellite altimeter data. The strong amplitude response of sea level oscillations (within the range of 0.30-0.54 m) as a free, barotropic CSW after Meranti, which impacted the TWS, was clearly detected in time and frequency (in bands of 64-81 h) using wavelet and cross-wavelet analyses. The measured group and phase speeds were consistent with the dispersion curves for CSW with the first-mode derived from the cross-shelf sections of the eastern TWS, with the mean speeds reaching 3 and 5.6±0.7 m/s, respectively. Coincidentally, the typhoon-induced sea level anomaly (SLA) was also captured by the satellite altimeter before this CSW entered into the TWS. Using the theoretical cross-shore CSW modes to fit the SLA data, the results indicated that the first three wave modes can interpret this CSW event appeared in the southern TWS very well, with the first mode being the dominant one.

Key words: continental shelf wave (CSW)|tidal gauge data|satellite altimeter data|typhoon|Taiwan Strait

Received: 2020-01-07 Revised: 2020-02-29

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