A dipole wind curl pattern induced by Taiwan Island and its effect on upper stratification in the northeastern South China Sea  

作　　者：邓奕 施平 周文 杜岩 谢强 庄伟 王东晓 

机构地区：[1]State Key Laboratory of Tropical Oceanography,South China Sea Institute of Oceanology,Chinese Academy of Sciences [2]Guy Carpenter Asia-Pacific Climate Impact Centre,School of Energy and Environment,City University of Hong Kong [3]Sanya Institute of Deep-sea Science and Engineering,Chinese Academy of Sciences

出　　处：《Chinese Journal of Oceanology and Limnology》2012年第6期944-952,共9页中国海洋湖沼学报（英文版）

基　　金：Supported by the Knowledge Innovation Program of Chinese Academy of Sciences (No. KZCX2-YW-Q11-02);the National Basic Research Program of China (973 Program) (No. 2011CB403503);the National Natural Science Foundation of China (Nos. 40876009,41176028)

摘　　要：Using hydrographic data sampled during four successive late summer-early autumn cruises in 2004-2007, vertical stratification along transects in the lee of Taiwan Island was analyzed to investigate upper ocean responses to orographically induced dipole wind stress curl (WSC). Results indicate that mixed-layer depth (MLD) and its relationship with thermocline depth varied under different local wind forcings. Average MLD along the transects from the 2004 to 2007 cruises were 18.5,30.7,39.2 and 24.5m, respectively. The MLD along the transects deepened remarkably and resulted in thermocline ventilation in 2005 and 2006, whereas ventilation did not occur in 2004 and 2007. Estimates indicate that frictional wind speed was the major factor in MLD variations. To a large degree, the combined effects of frictional wind speed and Ekman pumping are responsible for the spatial pattern of MLD during the cruises.Using hydrographic data sampled during four successive late summer-early autumn cruises in 2004-2007, vertical stratification along transects in the lee of Taiwan Island was analyzed to investigate upper ocean responses to orographically induced dipole wind stress curl （WSC）. Results indicate that mixed-layer depth （MLD） and its relationship with thermocline depth varied under different local wind forcings. Average MLD along the transects from the 2004 to 2007 cruises were 18.5, 30.7, 39.2 and 24.5 m, respectively. The MLD along the transects deepened remarkably and resulted in thermocline ventilation in 2005 and 2006, whereas ventilation did not occur in 2004 and 2007. Estimates indicate that frictional wind speed was the major factor in MLD variations. To a large degree, the combined effects of frictional wind speed and Ekman pumping are responsible for the spatial pattern of MLD during the cruises.

关 键 词：Taiwan Island dipole wind stress curl mixed layer depth THERMOCLINE 

分 类 号：P732[天文地球—海洋科学]