Journal
JOURNAL OF ATMOSPHERIC AND OCEANIC TECHNOLOGY
Volume 36, Issue 7, Pages 1361-1380Publisher
AMER METEOROLOGICAL SOC
DOI: 10.1175/JTECH-D-18-0201.1
Keywords
Ocean; Asia; Eddies; Eddies; Data processing
Funding
- National Natural Science Foundation of China [41506037]
- Basic Scientific Fund for National Public Research Institutes of China [GY0217Q06]
- Natural Foundation of Shandong Province of China [ZR2015PD009]
- NSFC-Shandong Joint Fund for Marine Science Research Centers [U1606405]
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Numerous oceanic mesoscale eddies occur in the South China Sea (SCS). The present study employs eight automatic eddy detection algorithms to identify these mesoscale eddies and compares the results. Eddy probabilities and areas detected by various algorithms differ substantially. Most regions of the SCS with a high discrepancy of eddy probabilities are those with few mesoscale eddies, except for the area west of the Luzon Strait, the area west of Luzon Island between 12 degrees and 17 degrees N, and the southernmost end of the SCS basin. They are primarily caused by strong interference, noncircular eddy shapes, and gentle sea level anomaly (SLA) gradients, respectively. The SLA, winding angle, and hybrid methods can easily detect the mesoscale eddies with wavelike features. The Okubo-Weiss (OW) and the spatially smoothed OW methods better identify grouping phenomena of mesoscale eddies in the SCS. Suggestions are presented on choosing suitable algorithms for studying mesoscale eddies in the SCS. No single algorithm is perfect for all research purposes. For different studies, the most suitable algorithm is different.
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