Estimate of contribution of near-inertial waves to the velocity shear in the Bay of Bengal based on mooring observations from2013 to 2014

作     者：Shanwu Zhang Yun Qiu Hangyu Chen Junqiang Shen Junpeng Zhang Jing Cha Fuwen Qiu Chunsheng Jing Shanwu Zhang;Yun Qiu;Hangyu Chen;Junqiang Shen;Junpeng Zhang;Jing Cha;Fuwen Qiu;Chunsheng Jing

作者机构：Third Institute of OceanographyMinistry of Natural ResourcesXiamen 361005China Laboratory for Regional Oceanography and Numerical ModelingPilot National Laboratory for Marine Science and Technology(Qingdao)Qingdao 266237China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai)Zhuhai 519082China 

出 版 物：《Acta Oceanologica Sinica》 (海洋学报（英文版）)

年 卷 期：2021年第40卷第11期

页      面：1-10页

核心收录：

学科分类：07[理学] 0707[理学-海洋科学] 

基　　金：The National Key Research and Development Program of China under contract No.2016YFC1401403 the State Oceanic Administration(SOA)Program on Global Change and Air-Sea Interactions under contract No.GASI-IPOVAI-02 the China Ocean Mineral Resources R&D Association under contract No.DY135-E2-4 the Scientific Research Foundation of Third Institute of Oceanography SOA under contract Nos 2018001,2017012 and 2014028 

主　　题：near-inertial waves shear monsoon tropical cyclone Bay of Bengal 

摘      要：Near-inertial motions contribute most of the velocity shear in the upper *** the Bay of Bengal(BoB),the annual-mean energy flux from the wind to near-inertial motions in the mixed layer in 2013 is dominated by tropical cyclone(TC)***,due to the lack of long-term observations of velocity profiles,our knowledge about interior near-inertial waves(NIWs)as well as their shear features is *** this study,we quantified the contribution of NIWs to shear by integrating the wavenumber-frequency spectra estimated from velocity profiles in the upper layers(40-440 m)of the southern Bo B from April 2013 to May *** is shown that the annual-mean proportion of near-inertial shear out of the total is approximately 50%,and the high contribution is mainly due to the enhancement of the TC processes during which the near-inertial shear accounts for nearly 80%of the *** the steady monsoon seasons,the near-inertial shear is dominant to or at least comparable with the subinertial *** contribution of NIWs to the total shear is lower during the summer monsoon than during the winter monsoon owing to more active mesoscale eddies and higher subinertial shear during the summer *** Doppler shifting of the M_(2)internal tide has little effect on the main results since the proportion of shear from the tidal motions is much lower than that from the near-inertial and subinertial motions.