The spatio-temporal variation of wintertime subtidal currents in the western Taiwan Strait

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摘要 Anewdatasetofobservationsbysixcruisesofship-mountedacousticdopplercurrentprofiler(SADCP)andthree40dlongbottom-mountedADCPs(BADCPs)isemployedtorevealthespatiotemporalvariabilityoftidalandsubtidalcurrentsinthewesternTaiwanStrait(TWS)duringwinterseason.TheresultsconfirmtheexistenceofintensecotidallinesforM_2tidalcurrent,whichislocatednorthof25°N.Inthiscase,noexistenceofanamphidromicpointcanbeidentified.Itisalsorevealedthatthecounter-windcurrent(CWC)canextendthroughthewholewesternTWSandevenoccupytheentirewatercolumnduringwintermonsoonrelaxation.However,thisCWCisobservedtobethoroughlyoverwhelmedbythedownwindChinacoastalcurrent(CCC)duringthetwobigmonsoonbloomeventsinthewinterof2007,andtheCCCconsequentlyextendssouthwardthroughoutthewesternTWSinstead.Mostimportantly,thevariationofthespatialextentfortheCWCandtheCCCinthewesternTWSisfoundtobewellexplainedbythefirsttwomodesofthevectorempiricalorthogonalfunction(VEOF)analysis,thatis,itismainlycontrolledbyawind-drivenquasibarotropiccurrentasthefirstmodeandslightlymodulatedbyarelativelyweakbackgroundcurrentwithafirst-orderbaroclinicstructureasthesecondmode.
机构地区 不详
出处 《海洋学报:英文版》 2017年11期
关键词
出版日期 2017年11月21日(中国期刊网平台首次上网日期,不代表论文的发表时间)
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