Tracking the evolution processes and behaviors of mesoscale eddies in the South China Sea:a global nearest neighbor filter approach

YI Jiawei; DU Yunyan; WANG Dongxiao; ZHOU Chenghu

doi:10.1007/s13131-017-1136-6

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Article Navigation > Acta Oceanologica Sinica > 2017 > 36(11): 27-37

YI Jiawei, DU Yunyan, WANG Dongxiao, ZHOU Chenghu. Tracking the evolution processes and behaviors of mesoscale eddies in the South China Sea:a global nearest neighbor filter approach[J]. Acta Oceanologica Sinica, 2017, 36(11): 27-37. doi: 10.1007/s13131-017-1136-6

Citation:

YI Jiawei, DU Yunyan, WANG Dongxiao, ZHOU Chenghu. Tracking the evolution processes and behaviors of mesoscale eddies in the South China Sea:a global nearest neighbor filter approach[J]. Acta Oceanologica Sinica, 2017, 36(11): 27-37. doi: 10.1007/s13131-017-1136-6

Citation:

YI Jiawei, DU Yunyan, WANG Dongxiao, ZHOU Chenghu. Tracking the evolution processes and behaviors of mesoscale eddies in the South China Sea:a global nearest neighbor filter approach[J]. Acta Oceanologica Sinica, 2017, 36(11): 27-37. doi: 10.1007/s13131-017-1136-6

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Tracking the evolution processes and behaviors of mesoscale eddies in the South China Sea:a global nearest neighbor filter approach

doi: 10.1007/s13131-017-1136-6

1.
State Key Laboratory of Resources and Environmental Information System, Institute of Geographic Science and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China;University of Chinese Academy of Sciences, Beijing 100049, China
2.
State Key Laboratory of Tropical Oceanography(LTO), South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China

Received Date: 2016-07-27
Rev Recd Date: 2016-11-29

Abstract

Abstract

The eddy tracking approach is developed using the global nearest neighbor filter (GNNF) to investigate the evolution processes and behaviors of mesoscale eddies in the South China Sea (SCS). Combining the Kalman filter and optimal data association technologies, the GNNF algorithm is able to reduce pairing errors to 0.2% in tracking synthetic eddy tracks, outperforming other existing methods. A total of 4 913 eddy tracks that last more than a week are obtained by the GNNF during 1993-2012. The analysis of a growth and a decay based on 3 445 simple eddy tracks show that eddy radius, amplitude, and vorticity smoothly increase during the first half of lifetime and decline during the second half following a parabola opening downwards. The genesis of eddies mainly clusters northwest and southwest of Luzon Island whereas the dissipations concentrate the Xisha Islands where the underwater bay traps and terminates eddies. West of the Luzon Strait, northwest of Luzon Island, and southeast of Vietnam are regions where eddy splits and mergers are frequently observed. Short disappearances mainly distribute in the first two regions. Moreover, eddy splits generally result in a decrease of the radius and the amplitude whereas eddy mergers induce growing up. Eddy intensity and vorticity, on the contrary, are strengthened in the eddy splits and diminished in mergers.
- mesoscale ocean eddies,
- eddy tracking,
- eddy split,
- eddy merger,
- South China Sea

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References(41)

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