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    Zheng Zhehao,Zhuang Wei,Hu Jianyu,Wu Zelun,Liu Changjian. 2020. Surface water exchanges in the Luzon Strait as inferred from Lagrangian coherent structures. Acta Oceanologica Sinica, 39(11):21-32
    Surface water exchanges in the Luzon Strait as inferred from Lagrangian coherent structures
    基于拉格朗日擬序結構的呂宋海峽表層水交換研究
    Received:May 01, 2020  
    DOI:10.1007/s13131-020-1677-y
    Key words:Lagrangian coherent structures (LCSs)  Kuroshio  Luzon Strait  transport pathways  particle tracking
    中文關鍵詞:  拉格朗日擬序結構  黑潮  呂宋海峽  輸運路徑  粒子追蹤
    基金項目:The National Key Research and Development Program of China under contract No. 2016YFA0601201; the National Natural Science Foundation of China under contract Nos 91858202, 91958203, 41730533 and 41776003.
    Author NameAffiliationE-mail
    Zheng Zhehao State Key Laboratory of Marine Environmental Science, College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China  
    Zhuang Wei State Key Laboratory of Marine Environmental Science, College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China
    Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519082, China 
    wzhuang@xmu.edu.cn 
    Hu Jianyu State Key Laboratory of Marine Environmental Science, College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China
    Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Zhuhai 519082, China 
     
    Wu Zelun State Key Laboratory of Marine Environmental Science, College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China
    Joint Center for Ocean Remote Sensing, University of Delaware-Xiamen University, Newark, DE 19716, USA 
     
    Liu Changjian South China Sea Marine Survey and Technology Center, Ministry of Natural Resources, Guangzhou 510300, China  
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    Abstract:
          This study presents a Lagrangian view of upper water exchanges across the Luzon Strait based on the finite-time Lyapunov exponents (FTLE) fields computed from the surface geostrophic current. The Lagrangian coherent structures (LCSs) extracted from the FTLE fields well identify the typical flow patterns and eddy activities around the Luzon Strait. In addition, they reveal the intricate transport paths and fluid domains, which are validated by the tracks of satellite-tracked surface drifters and cannot be visually recognized in the velocity maps. The FTLE fields indicate that there are mainly four types of transport patterns near the Luzon Strait; among them, the Kuroshio northward-flowing “leaping” pattern and the clockwise rotating “looping” pattern occur more frequently than the “leaking” pattern of the direct Kuroshio branch into the SCS and the “outflowing” pattern from the SCS to the Pacific. The eddy shedding events of the Kuroshio at the Luzon Strait are further analyzed, and the importance of considering LCSs in estimating transport by eddies is highlighted. The anticyclonic eddy (ACE) shedding cases reveal that ACEs mainly originate from the looping paths of Kuroshio and thus could effectively trap the Kuroshio water before eddy detachments. LCSs provide useful information to predict the positions of the upstream waters that finally enter the ACEs. In contrast, LCS snapshots indicate that during the formation of cyclonic eddies (CEs), most CEs are not connected with the pathways of Kuroshio water. Hence, the contribution of CEs to the surface water exchanges from the Pacific into the SCS is tiny.
    中文摘要:
          黑潮通過呂宋海峽入侵南海呈現明顯的瞬態特征。以往的研究通常將黑潮在呂宋海峽附近的流態分為幾種不同類型。本文基于表層地轉流計算得到的有限時間李雅普諾夫指數場(FTLE),展示了拉格朗日視角下的呂宋海峽上層水交換特征。從FTLE場提取的拉格朗日擬序結構(LCSs)很好地識別了呂宋海峽附近的典型流態和旋渦活動。此外,這些LCSs還揭示了呂宋海峽周圍復雜的輸運路徑和流體域,這些特征得到了衛星跟蹤浮標軌跡的驗證,且從流速場中是無法直接識別的。FTLE場顯示,呂宋海峽附近表層水體的輸運形態主要可分為四類。其中,黑潮直接向北流動的“跨越”形態和順時針旋轉的“流套”形態的發生頻次明顯高于直接進入南海的黑潮分支“滲入”形態和南海水流出至太平洋的“外流”形態。本文還進一步分析了黑潮在呂宋海峽處的渦旋脫落事件,突出強調了LCSs在評估渦旋輸運方面的重要性。反氣旋渦旋的脫落個例表明,這些渦旋主要源自黑潮“流套”,渦旋脫落之前可有效地俘獲黑潮水。LCS所指示的輸運通道信息有助于預測最終被反氣旋渦所挾卷水體在上游的位置。而在氣旋渦的形成過程中,LCS的分布特征表明,大部分氣旋渦并未與黑潮水的輸運路徑相連通。因此,氣旋渦對從太平洋到南海的上層水交換的貢獻較小。
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