文献类型：期刊文献

英文题名：Satellite observations of sub-mesoscale vortex trains in the western boundary of the South China Sea

作者：Yu, Jie[1,2];Zheng, Quanan[2,3];Jing, Zhiyou[4];Qi, Yiquan[1];Zhang, Shuwen[2];Xie, Lingling[2]

机构：[1]Hohai Univ, Coll Oceanog, Nanjing, Jiangsu, Peoples R China;[2]Guangdong Ocean Univ, Guangdong Prov Key Lab Coastal Ocean Variat & Dis, Zhanjiang, Peoples R China;[3]Univ Maryland, Dept Atmospher & Ocean Sci, College Pk, MD 20742 USA;[4]Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Guangdong, Peoples R China

年份：2018

卷号：183

起止页码：56

外文期刊名：JOURNAL OF MARINE SYSTEMS

收录：SCI-EXPANDED(收录号：WOS:000431937100006)、、EI(收录号：20181505000667)、Scopus(收录号：2-s2.0-85045075491)、WOS

基金：The datasets for this study are derived from (1) MEdium Resolution Imaging Spectrometer (MERIS) Level 2 Full Resolution Full Swath (FRS) dataset (https://merisfrs-merci-ds.eo.esa.int/merci/welcome.do); and (2) Archiving, Validation and Interpretation of Satellite Oceanographic Data (AVISO), Centre National d'Etudes Spatiales (CNES) of France (http://www.aviso.altimetry.fr/duacs/). The authors thank the ESA and CNES for providing a suite of satellite data. This work is supported by the Basic Planning Project of Ministry of Science and Technology of Peoples Republic of China (2016YFC1401403), the National Natural Science Foundation of China (41776040, 41230962, 41476009 and 4167008), and the Foundation of Guangdong Province for Outstanding Young Teachers in University of China (YQ2015088). Zhiyou Jing is sponsored in part by the "Youth Innovation Promotion Association" of CAS (2014317, LTOZZ1701). We thank the anonymous reviewers for useful comments.

语种：英文

外文关键词：MERIS; Sub-mesoscale vortex train; WSCS; Rossby number; Karman vortex street

外文摘要：This study uses high resolution MEdium Resolution Imaging Spectrometer (MERIS) satellite data to analyze sub-mesoscale ocean vortex trains (OVTs) in the western boundary of the South China Sea (SCS). Thirteen cases of vortex trains on the lee side of the Phu Quy Island were observed in the boreal summer from May to August of 2005 - 2010. The average diameter of the vortices is 28.1 +/- 13.8 km. The average spacing distance estimated between two consecutive vortices is 66.3 +/- 27.8 km. The dynamic parameters of a case observed on July 26, 2009 were extracted using a theoretical model. The aspect ratio is 2.8. The ratio of the propagation velocity of the vortex to the undisturbed flow velocity is 0.73. We use a nested high-resolution numerical model with the finest grid of 500 m, to analyze the dynamics of OVT induced by the local topography in the western SCS (WSCS). The results give a propagation velocity of vortex 0.49 of m s(-1) and a mean current velocity of undisturbed flow 0.58 m s(-1). Therefore, the ratio is 0.84. The shedding frequency is determined to be 1.14 x 10(-5) s(-1), corresponding to 1.02 day. The results also suggest that the sub-mesoscale cyclonic vortices along the OVT in the WSCS are characterized by low temperature and high Rossby number. The strong vertical vorticity and associated horizontal velocity shear of an individual vortex brings uplifted cold water on its leading side and warm water on its trailing side, which could drive an enhanced vertical exchange between the surface and oceanic interior.