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    Huang Runqi,Xie Lingling,Zheng Quanan,Li Mingming,Bai Peng,Tan Keyi. 2020. Statistical analysis of mesoscale eddy propagation velocity in the South China Sea deep basin. Acta Oceanologica Sinica, 39(11):91-102
    Statistical analysis of mesoscale eddy propagation velocity in the South China Sea deep basin
    南海海盆中尺度渦移動速度統計分析
    Received:June 15, 2020  
    DOI:10.1007/s13131-020-1678-x
    Key words:South China Sea  mesoscale eddies  eddy propagation velocity  variation in life span  eddies with abnormal speeds
    中文關鍵詞:  南海  中尺度渦  渦旋移動速度  生命周期內變化  移速異常渦旋
    基金項目:The National Natural Science Foundation of China under contract Nos 41776034 and 41706025; the Fund of Southern Marine Science and Engineering Guangdong Laboratory (Zhanjiang) under contract No. ZJW-2019-08; the Special Project of Global Change and Air and Sea Interaction under contract No. GASI-02-SCS-YGST2-02; the Guangdong Province First-Class Discipline Plan under contract Nos CYL231419012 and 231389002; the Scientific Research Setup Fund of Guangdong Ocean University under contract No.101302/R18001.
    Author NameAffiliationE-mail
    Huang Runqi Laboratory of Coastal Ocean Variation and Disaster Prediction, College of Ocean and Meteorology, Guangdong Ocean University, Zhanjiang 524088, China  
    Xie Lingling Laboratory of Coastal Ocean Variation and Disaster Prediction, College of Ocean and Meteorology, Guangdong Ocean University, Zhanjiang 524088, China
    Marine Resources Big Data Center of South China Sea, Southern Marine Science and Engineering Guangdong Laboratory (Zhanjiang), Zhanjiang 524025, China 
    xiell@gdou.edu.cn 
    Zheng Quanan Department of Atmospheric and Oceanic Science, University of Maryland, College Park, Maryland 20742, USA  
    Li Mingming Laboratory of Coastal Ocean Variation and Disaster Prediction, College of Ocean and Meteorology, Guangdong Ocean University, Zhanjiang 524088, China
    Marine Resources Big Data Center of South China Sea, Southern Marine Science and Engineering Guangdong Laboratory (Zhanjiang), Zhanjiang 524025, China 
     
    Bai Peng Laboratory of Coastal Ocean Variation and Disaster Prediction, College of Ocean and Meteorology, Guangdong Ocean University, Zhanjiang 524088, China
    Marine Resources Big Data Center of South China Sea, Southern Marine Science and Engineering Guangdong Laboratory (Zhanjiang), Zhanjiang 524025, China 
     
    Tan Keyi Laboratory of Coastal Ocean Variation and Disaster Prediction, College of Ocean and Meteorology, Guangdong Ocean University, Zhanjiang 524088, China  
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    Abstract:
          Using mesoscale eddy trajectory product derived from satellite altimetry data from 1993 to 2017, this study analyzes the statistical characteristics of spatiotemporal distribution of mesoscale eddy propagation velocities (C) in the South China Sea (SCS) deep basin with depths >1 000 m. Climatologically, the zonal propagation velocities (cx) are westwards in the whole basin, and the meridional velocities (cy) are southwards in the northwestern basin, and northwards in the southeastern basin. The variation of cy with longitude is consistent with that of the background meridional currents with correlation coefficient R2 of 0.96, while the variation of cx is related both to the background zonal currents and β effect. The propagation velocities characterize significant seasonality with the minimum magnitude occurring in summer and the maximum in winter for cx and C. Interannually, larger values of cx and cy mostly occurred in La Niña years in the negative phase of the Pacific Decadal Oscillation (PDO). Mesoscale eddies move fast at the beginning and end of their life span, i.e., at their growth and dissipation periods, and slowly during their stable “midlife” period. This trend is negatively correlated with the rotating tangential velocity with R2 of –0.93. Eddies with extreme propagation velocities are defined, which are slower (faster) than 1.5 cm/s (15.4 cm/s) and take 1.5% (1.9%) of the total eddies. The extremely slow-moving (fast-moving) eddies tend to appear in the middle (on the edge) of the basin, and mostly occur in summer (winter). The mechanism analysis reveals that the spatiotemporal distributions of the propagation velocities of mesoscale eddies in the SCS are modulated by the basin-scale background circulation.
    中文摘要:
          基于1993-2017年衛星高度計數據得到的中尺度渦追蹤產品,分析了1000 m以深南海海盆中尺度渦移動速度C的時空分布特征。結果表明,南海海盆氣候態平均的中尺度渦緯向移動速度cx均為西向,經向移動速度cy在海盆西北側為南向,東南側為北向。cy隨經度的變化與背景經向流的變化一致,相關系數達0.96,而cx的變化與背景緯向流和β效應有關。cxC存在明顯季節變化,夏季最慢,冬季最快。年際變化上,cxcy的大值多發生在太平洋年代際濤動(PDO)負位相期的La Nina年。中尺度渦在其生命周期的開始和結束階段(即生成和耗散階段)移速較快,而在穩定的“中期”階段移動緩慢。該趨勢與渦旋轉速呈反相關,相關系數為-0.93。以移速小于1.5 cm/s和大于15.4 cm/s定義的極慢和極快渦旋,分別占總渦旋數量的1.5%和1.9%。移速極慢的渦多出現在海盆的中部,且主要發生在夏季;移速極快的渦多出現在海盆的邊緣,且主要發生在冬季。機制分析顯示,南海海盆中尺度渦移動速度的時空分布受到大尺度背景流場調制。
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