Mesoscale eddies in the South China Sea: Mean properties, spatiotemporal variability, and impact on thermohaline structure
Mesoscale eddies in the South China Sea: Mean properties, spatiotemporal variability, and impact on thermohaline structure
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南海中尺度涡旋：平均特性、时空变化及其对温盐结构的影响
DOI：
10.1029/2010jc006716
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发表时间：
2011-06
影响因子：
--
通讯作者：
Chu Xiaoqing
中科院分区：
文献类型：
--
作者：
Chen Gengxin;Hou Yijun;Chu Xiaoqing
利用17年的卫星测高资料和缠绕角法识别出的827条涡迹，分析了南海7000多个涡的平均特征和时空变化。涡旋主要产生在吕宋海峡西南部和东北-西南方向。大部分地区两种类型的涡旋（反气旋性和气旋性）数量没有显着差异。涡旋的平均半径和寿命分别为132公里和8.8周，两者都取决于涡旋形成的位置。反气旋涡旋和气旋涡旋在其存在期间倾向于以不同的方式变形。此外，涡的传播和演变特征进行了研究。在南海北方，涡旋主要沿沿着大陆坡向西南方向传播，速度为5.0-9.0 cm s（-1），而在南海中部，涡旋的运动方向虽有轻微的辐散，但仍呈准西向，速度为2.0-6.4 cm s（-1）。在越南东部的西部盆地中，涡的传播是非常随机的，没有统一的传播方向。对38个长寿命涡旋的研究表明，涡旋在前12周有一个快速增长阶段，然后是一个缓慢衰减阶段，影响涡旋半径和涡旋能量密度。然而，涡度的变化较小。此外，利用763个Argo温度剖面资料，分析了涡旋对温跃层和盐跃层的影响。气旋性涡旋使温跃层变浅变薄，温跃层强度明显增强;反气旋性涡旋使温跃层变深变窄，温跃层强度在一定程度上减弱。气旋性涡旋影响下的盐跃层也比反气旋性涡旋影响下的盐跃层浅而薄。最后，在季节和年际尺度上研究了涡动的时间变化。涡动活动对风应力旋度敏感，在南海北方还与背景流强度有关。
We investigated mean properties and the spatiotemporal variability of eddies in the South China Sea (SCS) by analyzing more than 7000 eddies corresponding to 827 eddy tracks, identified using the winding angle method and 17 years of satellite altimetry data. Eddies are mainly generated in a northeast-southwest direction and southwest of Luzon Strait. There is no significant difference between the numbers of two types of eddies (anticyclonic and cyclonic) in most regions. The mean radius and lifetime of eddies are 132 km and 8.8 weeks, respectively, both depending on where the eddies are formed. Anticyclonic and cyclonic eddies tend to deform during their lifetimes in different ways. Furthermore, eddy propagation and evolution characteristics are examined. In the northern SCS, eddies mainly propagate southwestward along the continental slope with velocities of 5.0-9.0 cm s(-1), while in the central SCS, eddies tend to move with slight divergence but still in a quasi-westward direction with velocities of 2.0-6.4 cm s(-1). Eddy propagation in the western basin to the east of Vietnam is quite random, with no uniform propagate direction. Investigation of 38 long-lived eddies shows that eddies have a swift growing phase during the first 12 weeks and then a slow decaying phase that affects the eddy radii and eddy energy densities. Nevertheless, vorticity has less variability. In addition, the effect of eddies on the thermocline and halocline is analyzed using 763 Argo temperature profile data. Cyclonic eddies drive the thermocline shallower and thinner and significantly strengthen the thermocline intensity, whereas anticyclonic eddies cause the thermocline to deepen and thicken and weaken the thermocline intensity to a certain degree. The halocline impacted by cyclonic eddies is also shallower and thinner than that impacted by anticyclonic eddies. Finally, eddy temporal variations are examined at seasonal and interannual scales. Eddy activity is sensitive to the wind stress curl and in the northern SCS it is also related with the strength of the background flows.
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影响因子：
3.6
作者：
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通讯作者：
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