南海西边界流区域涡旋特征及两类冬季环流对涡致热输运的调制  

The characteristics of eddy in western boundary current of South China Sea and its relationship with winter circulation

作　　者：刘钦燕[1,2] 李汶莲 石睿 陈举[1] 李春晖[4] 谢强[5] LIU Qinyan;LI Wenlian;SHI Rui;CHEN Ju;LI Chunhui;XIE Qiang(South China Sea Institute of Oceanology,Chinese Academy of Sciences,Guangzhou 510301,China;Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou),Guangzhou 511458,China;University of Chinese Academy of Sciences,Beijing 100049,China;Guangzhou Institute of Tropical and Marine Meteorology,China Meteorological Administration,Guangzhou 510640;Institute of Deep-Sea Science and Engineering,Chinese Academy of Sciences,Sanya 572000,China)

机构地区：[1]中国科学院南海海洋研究所,广东广州510301 [2]南方海洋科学与工程广东省实验室(广州),广东广州511458 [3]中国科学院大学,北京100049 [4]中国气象局广州热带海洋气象研究所,广东广州510640 [5]中国科学院深海科学与工程研究所,海南三亚572000

出　　处：《热带海洋学报》2023年第3期52-66,共15页Journal of Tropical Oceanography

基　　金：科技部资源调查专项课题(2017FY201402);国家自然科学基金面上项目(41576012、41876017、42176027)。

摘　　要：本文基于观测数据和模式产品,探讨了南海西边界流(South China Sea western boundary current,SCSwbc)区域海洋涡旋的统计特征、涡致热输运并重点探讨了两类冬季环流形态及其风场分布对它们的影响。结果表明研究区域的涡旋气候态上存在旋转速度很强,半径较大,振幅略高于平均值的涡旋统计特征,其中气旋式涡旋(cyclonic eddy,CE)的占比约为56.8%。并且涡旋的生成和消亡主要发生在冬/春季,而涡旋的振幅、半径和旋转速度在夏/秋季发展到顶峰。年际时间尺度上,年平均经向风应力与反气旋式涡旋(anticyclonic eddy,AE)的振幅、半径、旋转速度和消亡均有较好的相关性,但与CE特征的相关性并不好。“O”型冬季环流模态下,风场和南海西边界流显著减弱,冬季环流在越南沿岸发生向东分支。涡旋在“O”模态下吸收平均流能量迅速发展,在越南沿岸东部地区产生了强的涡致热输运(eddy-induced heat transport,EHT)。同时,涡旋内部旋转速度减小且反气旋式涡旋个数减少;“U”型冬季环流模态下,情况则相反。Based on the satellite observations and model outputs,the statistical characteristics of eddy,eddy-induced heat transport and the influences from two winter circulation patterns and wind stress are discussed in this study.The results show that the climatological mean of eddy statistics in the study area has characteristics of strong rotation speed,large radius and amplitude that are slightly higher than the average in the whole SCS,among which cyclonic eddy(CE)accounts for 56.8%.The formation and extinction of eddies mainly occur in winter/spring,while the amplitude,radius and rotation speed of eddy reach their peak values in summer/autumn.On the interannual time scale,the annual mean meridional wind stress has a good correlation with anticyclonic eddy(AE)including its amplitude,radius,rotation speed and extinction,but the correlations with CE are weak.In the“O”pattern,the western boundary current and winter wind stress are significantly weakened,and the easterly branches of winter circulation occur along the coast of Vietnam.By absorbing mean flow energy,the eddy in this study area developed rapidly in“O”pattern,generating strong eddy-induced heat transport(EHT)in the east of the Vietnam coast.In the meantime,the rotation speed of eddy and the number of AE decrease.The above situation is opposite under the“U”winter circulation pattern.

关 键 词：南海西边界流 涡旋统计特征 涡致热输运 

分 类 号：P731.2[天文地球—海洋科学]