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Dynamics of the Summer Counter-Wind Current Along South Sri Lanka Coast: 2. Relative Contributions of Local and Remote Forcing on the Intra-Seasonal Timescale

文献类型：期刊论文

作者Xin, Hongyu5,6; Wang, Weiqiang3,4; Xie, Qiang6; Han, Weiqing2; Huang, Ke4; Xu, Kang3,4; Arulananthan, K.1; Tennakoon, Kamal1
刊名JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
出版日期2024-09-01
卷号129期号:9页码:20
关键词south Sri Lanka coastal current counter-wind current Rossby wave southern BoB forcing boreal summer intra-seasonal oscillation intra-seasonal variablity
ISSN号2169-9275
DOI10.1029/2023JC020619
英文摘要It is well known that the intra-seasonal component is critical for the occurrence of the westward south Sri Lanka coastal current (SSLCC) during summer. In this study, the relative contributions and physical processes that determine the westward SSLCC during summer on the intra-seasonal timescale are quantified using the reanalysis data and a simple linear, continuously stratified (LCS) ocean model. A comprehensive analysis of the westward SSLCC events reveals that the wind forcing from south Sri Lanka coast, equatorial Indian Ocean, and southern Bay of Bengal (BoB) is responsible for the westward SSLCC (on the intra-seasonal timescale), contributing 53%, 30%, and 17%, respectively. The local wind forcing along the southern Sri Lanka is linked to the boreal summer intra-seasonal oscillation (BSISO). Specifically, the negative phase of the BSISO, characterized by active atmospheric convection, induces cyclonic wind stress curl along the south coast of Sri Lanka, and directly promoting the westward SSLCC. The equatorial forcing plays a secondary role in the westward SSLCC via mixing behavior of the first and second baroclinic modes upwelling Rossby waves (0.64 m s-1), propagating westward along the 5 degrees N section as the cyclonic vortices. On the contrast, influenced by the modulation of the BSISO signal, the forcing from the southern BoB excites the rapid westward propagation of the first baroclinic mode upwelling Rossby waves (0.85 m s-1) near 90 degrees E, contributing the westward SSLCC. This study explores the crucial role of intra-seasonal dynamics in driving the westward south Sri Lanka coastal current (SSLCC) during summer. Using reanalysis data and a simple linear, continuously stratified (LCS) ocean model, the research reveals the combined effects of wind forcing from three sources of southern Sri Lanka coast, equatorial Indian Ocean, and southern Bay of Bengal (BoB), contributing 53%, 30%, and 17%, respectively. These three forcings exhibit distinct physical processes: local wind forcing directly affects the westward SSLCC through the local cyclonic wind stress curl, while wind forcing from equatorial and southern BoB promotes the westward SSLCC through the first-second baroclinic mode and first baroclinic mode of the upwelling Rossby waves, respectively. This study provides valuable insights into the mechanisms of the SSLCC variability and deepens our understanding of coastal circulation dynamics. The wind forcing from southern Sri Lanka (53%), equatorial (30%), and Bay of Bengal (BoB, 17%) is responsible for the westward south Sri Lanka coastal current (SSLCC) The local wind forcing induces the cyclonic wind stress curl along the south coast of Sri Lanka, directly facilitating the westward SSLCC The equatorial (BoB) forcing affects the westward SSLCC via the westward propagation of upwelling Rossby wave in the first-second (first) baroclinic modes
WOS关键词EQUATORIAL INDIAN-OCEAN ; 40-50 DAY OSCILLATION ; SEA-SURFACE HEIGHT ; INTRASEASONAL VARIABILITY ; INTERANNUAL VARIABILITY ; SEMIANNUAL VARIABILITY ; MONSOON CURRENT ; ROSSBY WAVES ; BAY ; CIRCULATION
资助项目National Key R&D Program of China ; National Natural Science Foundation of China[42076020] ; National Natural Science Foundation of China[42275024] ; National Natural Science Foundation of China[42176021] ; Guangdong Basic and Applied Basic Research Foundation[2023B1515020009] ; Guangdong Basic and Applied Basic Research Foundation[2022B1212050003] ; Youth Innovation Promotion Association CAS[2020340] ; Rising Star Foundation of the South China Sea Institute of Oceanology[NHXX2018WL0201] ; Chinese Academy of Sciences[SCSIO202201] ; Chinese Academy of Sciences[SCSIO2023QY01] ; Chinese Academy of Sciences[SCSIO2023HC07] ; NSFC Shiptime Sharing Projects[NORC2022-10+NORC2022-303] ; NSFC Shiptime Sharing Projects[42149910] ; NSFC Shiptime Sharing Projects[NORC2023-10+NORC2023-303] ; NSFC Shiptime Sharing Projects[42249910] ; China-Sri Lanka Joint Center for Education and Research, Chinese Academy of Science ; [2022YFE0203500]
WOS研究方向Oceanography
语种英语
WOS记录号WOS:001310042300001
出版者AMER GEOPHYSICAL UNION
资助机构National Key R&D Program of China ; National Natural Science Foundation of China ; Guangdong Basic and Applied Basic Research Foundation ; Youth Innovation Promotion Association CAS ; Rising Star Foundation of the South China Sea Institute of Oceanology ; Chinese Academy of Sciences ; NSFC Shiptime Sharing Projects ; China-Sri Lanka Joint Center for Education and Research, Chinese Academy of Science
源URL[http://ir.idsse.ac.cn/handle/183446/11401]  
专题深海科学研究部_海洋环流观测与数值模拟研究室
通讯作者Wang, Weiqiang
作者单位1.Natl Aquat Resources Res & Dev Agcy Crow Isl, Colombo, Sri Lanka
2.Univ Colorado Boulder, Dept Atmospher & Ocean Sci, Boulder, CO USA
3.Chinese Acad Sci, Guangdong Key Lab Ocean Remote Sensing, South China Sea Inst Oceanol, Guangzhou, Peoples R China
4.Chinese Acad Sci, South China Sea Inst Oceanol, State Key Lab Trop Oceanog, Guangzhou, Peoples R China
5.Univ Chinese Acad Sci, Beijing, Peoples R China
6.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Sanya, Peoples R China
推荐引用方式
GB/T 7714		 Xin, Hongyu,Wang, Weiqiang,Xie, Qiang,et al. Dynamics of the Summer Counter-Wind Current Along South Sri Lanka Coast: 2. Relative Contributions of Local and Remote Forcing on the Intra-Seasonal Timescale[J]. JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,2024,129(9):20.
APA Xin, Hongyu.,Wang, Weiqiang.,Xie, Qiang.,Han, Weiqing.,Huang, Ke.,...&Tennakoon, Kamal.(2024).Dynamics of the Summer Counter-Wind Current Along South Sri Lanka Coast: 2. Relative Contributions of Local and Remote Forcing on the Intra-Seasonal Timescale.JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,129(9),20.
MLA Xin, Hongyu,et al."Dynamics of the Summer Counter-Wind Current Along South Sri Lanka Coast: 2. Relative Contributions of Local and Remote Forcing on the Intra-Seasonal Timescale".JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS 129.9(2024):20.

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来源：深海科学与工程研究所

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