Spatial structure of turbulent mixing of an anticyclonic mesoscale eddy in the northern South China Sea
Spatial structure of turbulent mixing of an anticyclonic mesoscale eddy in the northern South China Sea
复制标题
南海北部反气旋中尺度涡湍流混合的空间结构
DOI：
10.1007/s13131-020-1676-z
复制
发表时间：
2020-11
影响因子：
1.4
通讯作者：
Shang Xiaodong
中科院分区：
文献类型：
--
作者：
Qi Yongfeng;Shang Chenjing;Mao Huabin;Qiu Chunhua;Liang Changrong;Yu Linghui;Yu Jiancheng;Shang Xiaodong
利用2015年5月水下滑翔机观测资料，采用Gregg-Henyey-Polzin参数化方法和Thorpe尺度方法，对南海北方反气旋涡旋内部和周围区域的上层湍流混合进行了估算。观测结果表明，在反气旋涡流区，湍流混合存在明显的非对称空间分布。在反气旋中尺度涡旋的后缘发现了增强的扩散率（约为10− 3 m2/s），而在前部，扩散率平均要低一个数量级。这种不对称的模式是高度相关的涡动动能。后侧较高的剪切方差，这有利于触发剪切不稳定性，可能是扩散率升高的主要机制。此外，由中尺度涡旋在其后侧供给的次中尺度运动的产生和发展也可能促进研究区域强混合的发生。这项研究的结果有助于提高我们的知识，在北方南海湍流混合。
Upper turbulent mixing in the interior and surrounding areas of an anticyclonic eddy in the northern South China Sea (SCS) was estimated from underwater glider data (May 2015) in the present study, using the Gregg-Henyey-Polzin parameterization and the Thorpe-scale method. The observations revealed a clear asymmetrical spatial pattern of turbulent mixing in the anticyclonic eddy area. Enhanced diffusivity (in the order of 10−3m2/s) was found at the posterior edge of the anticyclonic mesoscale eddy; on the anterior side, diffusivity was one order of magnitude lower on average. This asymmetrical pattern was highly correlated with the eddy kinetic energy. Higher shear variance on the posterior side, which is conducive to the triggering of shear instability, may be the main mechanism for the elevated diffusivity. In addition, the generation and growth of sub-mesoscale motions that are fed by mesoscale eddies on their posterior side may also promote the occurrence of strong mixing in the studied region. The results of this study help improve our knowledge regarding turbulent mixing in the northern SCS.
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影响因子：
2.3
作者：
Yinglai Jia;E. Chassignet
通讯作者：
Yinglai Jia;E. Chassignet
影响因子：
3.5
作者：
Jieshuo Xie;Yinghui He;Zhiwu Chen;Jiexin Xu;S. Cai
通讯作者：
Jieshuo Xie;Yinghui He;Zhiwu Chen;Jiexin Xu;S. Cai
影响因子：
3.5
作者：
Capet, X.;Mcwilliams, J. C.;Shchepetkin, A. F.
通讯作者：
Shchepetkin, A. F.
影响因子：
--
作者：
GARRETT, C;MUNK, W
通讯作者：
MUNK, W
影响因子：
--
作者：
S. Xie;Q. Xie;Dongxiao Wang;W. Liu
通讯作者：
S. Xie;Q. Xie;Dongxiao Wang;W. Liu