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volume transport in the East Taiwan Channel in response to diff erent tracks of typhoons as revealed by HYCOM data

Journal of Oceanology and Limnology 2022年第1期40卷 22-36页

作者： Yuanshou HE Po HU Bing YANG Yuqi YIN Yijun HOU CAS Key Laboratory of Ocean Circulation and Waves Institute of OceanologyChinese Academy of SciencesQingdao 266071China Laboratory for Ocean and Climate Dynamics Pilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao 266071China

Northward infl ow through the East Taiwan Channel is vital in modulation of water exchange processes off northeastern Taiwan,China.In addition to the eff ects of the Kuroshio Current and westward-propagating oceanic mesoscale eddies,the seas off eastern Taiwan,China,are frequently infl uenced by typhoons.Focusing on extrema of East Taiwan Channel volume transport(ETCVT)that appear within days of typhoon infl uence,this study investigated 124 historical cyclones including 91 typhoons that passed over the study sea area off eastern Taiwan,China.Based on 25-year HYbrid Coordinate Ocean Model(HYCOM)data,71%of short-term(within 10 d)ETCVT absolute values with>5 Sv occurred under the infl uence of typhoons crossing the study sea area,and the maximum short-term ETCVT extrema induced by typhoons were 12.5 and-10.9 Sv.The ETCVT extrema induced by typhoons showed reasonable positive correlation with typhoon wind speed.More importantly,the ETCVT extrema diff ered in response to diff erent typhoon tracks.Three types of typhoon were identifi ed based on their track and impact on ETCVT.Representative typhoon cases were examined to elucidate the specifi cs of each typical response.Based on historical best track data and HYCOM data,it was established that Type I typhoons caused the ETCVT to exhibit a negative extremum followed by a positive extremum.All Type I,II,and III typhoons tended to result in typical ETCVT fl uctuations in the surface mixing layer above the depth of 50-100 m,while Type II typhoons were more likely to induce ETCVT fl uctuations in the subsurface layer.The fi ndings of this study enhance understanding of ETCVT extrema that occur following typhoon passage,which is valuable for short-term physical-biogeochemical studies both in the study region and in areas downstream owing to the large net volume transport changes induced by typhoons.

关键词： ocean modeling East Taiwan Channel volume transport extrema typhoon

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