Vertical velocity and transport in the South China Sea  

作　　者：Yaohua Zhu Dingqi Wang Yonggang Wang Shujiang Li Tengfei Xu Zexun Wei 

机构地区：[1]First Institute of Oceanography,and Key Laboratory of Marine Science and Numerical Modeling,Ministry of Natural Resources,Qingdao,266061,China [2]Laboratory for Regional Oceanography and Numerical Modeling,Pilot National Laboratory for Marine Science and Technology(Qingdao),Qingdao,266237,China [3]Shandong Key Laboratory of Marine Science and Numerical Modeling,Qingdao,266061,China [4]College of Oceanic and Atmospheric Sciences,Ocean University of China,Qingdao,266100,China

出　　处：《Acta Oceanologica Sinica》2022年第7期13-25,共13页海洋学报（英文版）

基　　金：The National Key Research and Development Program of China under contract No.2019YFC1408400;the National Natural Science Foundation of China under contract Nos 41876029,41821004 and 41776042.

摘　　要：Deep water in the South China Sea is renewed by the cold and dense Luzon Strait overflow.However,from where and how the deep water upwells is poorly understood yet.Based on the Hybrid Coordinate Ocean Model reanalysis data,vertical velocity is derived to answer these questions.Domain-integrated vertical velocity is of two maxima,one in the shallow water and the other at depth,and separated by a layer of minimum at the bottom of the thermocline.Further analysis shows that this two-segmented vertical transport is attributed to the vertical compensation of subsurface water to the excessive outflow of shallow water and upward push of the dense Luzon Strait overflow,respectively.In the abyssal basin,the vertical transport increases upward from zero at the depth of 3500–4000 m and reaches a maximum of 1.5×10^(6) m^(3)/s at about 1500 m.Deep water upwells mainly from the northeastern and southwestern ends of the abyssal basin and off the continental slopes.To explain the upward velocity arising from slope breaks,a possible mechanism is proposed that an onshore velocity component can be derived from the deep western boundary current above steep slopes under bottom friction.

关 键 词：vertical velocity vertical transport Luzon Strait overflow South China Sea 

分 类 号：P731.2[天文地球—海洋科学]