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Wenjin Sun, Jingsong Yang, Wei Tan, Yu Liu, Baojun Zhao, Yijun He, Changming Dong. Eddy diffusivity and coherent mesoscale eddy analysis in the Southern Ocean[J]. Acta Oceanologica Sinica.
Citation: Wenjin Sun, Jingsong Yang, Wei Tan, Yu Liu, Baojun Zhao, Yijun He, Changming Dong. Eddy diffusivity and coherent mesoscale eddy analysis in the Southern Ocean[J]. Acta Oceanologica Sinica.

Eddy diffusivity and coherent mesoscale eddy analysis in the Southern Ocean

Funds:  The National Key Research Programs of China under contract Nos 2017YFA0604100 and 2016YFC1401407; the National Natural Science Foundation of China under contract Nos 41906008, 41806039 and 41706205; the Open fund of State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, MNR under contract No. QNHX2022; the Startup Foundation for Introducing Talent of Nanjing University of Information Science & Technology under contract No. 2019r049; the Startup Foundation for Introducing Talent of Zhejiang Ocean University; the Innovation Group Project of Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai) under contract No. 311020004.
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  • The spatial distribution of eddy diffusivity, basic characteristics of coherent mesoscale eddies and their relationship are analyzed from numerical model outputs in the Southern Ocean. Mesoscale fluctuation information is obtained by a temporal-spatial filtering method, and the eddy diffusivity is calculated using a linear regression analysis between isoneutral thickness flux and large-scale isoneutral thickness gradient. The eddy diffusivity is on the order of O (103 m2/s) with a significant spatial variation, and it is larger in the area with strong coherent mesoscale eddy activity. The mesoscale eddies are mainly located in the upper ocean layer, with the average intensity no larger than 0.2. The mean radius of the coherent mesoscale cyclonic (anticyclonic) eddy gradually decays from (121.2±10.4) km ((117.8±9.6) km) at 30°S to (43.9±5.3) km ((44.7±4.9) km) at 65°S. Their vertical penetration depths (lifespans) are deeper (longer) between the northern side of the Subpolar Antarctic Front and 48°S. The normalized eddy diffusivity and coherent mesoscale eddy activity show a significant positive correlation, indicating that coherent mesoscale eddy plays an important role in eddy diffusivity.
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