Similarities and differences in statistical characteristics of mesoscale eddies between southeastern tropical Indian Ocean and northern South China Sea

Wang Yuze; Xu Tengfei; Wang Yanfeng; Wei Zexun

doi:10.12284/hyxb2024101

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Wang Yuze，Xu Tengfei，Wang Yanfeng, et al. Similarities and differences in statistical characteristics of mesoscale eddies between southeastern tropical Indian Ocean and northern South China Sea[J]. Haiyang Xuebao，2024, 46(10)：1–13 doi: 10.12284/hyxb2024101

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Similarities and differences in statistical characteristics of mesoscale eddies between southeastern tropical Indian Ocean and northern South China Sea

doi: 10.12284/hyxb2024101

First Institute of Oceanography, Ministry of Natural Resources, Qingdao, Shandong 266061, China

Received Date: 2024-05-17
Rev Recd Date: 2024-08-13

Available Online: 2024-09-26

Abstract

Abstract

Both the southeastern Tropical Indian Ocean and the northern South China Sea are similar in topography and background circulation characteristics, and both have active mesoscale eddy motion. Based on satellite altimeter data, the seasonal and interannual variations of mesoscale eddies in these two sea areas are compared. The results show that the number of mesoscale eddies generated in the southeastern Tropical Indian Ocean and the northern South China Sea decay exponentially with the growth of their life cycle. Mesoscale eddies in these two sea areas move to the west or southwest with an average speed of 0.2 m/s, but the average radius of the former is larger and the average amplitude of the latter is stronger. In terms of seasonal variation, the eddy kinetic energy is smallest in spring and largest in autumn in the northern hemisphere, but the eddy generation number in the southeastern Tropical Indian Ocean is largest in summer-autumn and the northern South China Sea is largest in winter-spring. In interannual variation, the eddy activity in the southeastern Tropical Indian Ocean and the northern South China Sea is affected by El Niño-Southern Oscillation (ENSO). The eddy kinetic energy is stronger In El Niño year and weaker in La Niña year, but the mechanism of ENSO affecting the mesoscale eddy in these two areas is slightly different. The former is mainly achieved by modulating Indonesian Throughflow to suppress or enhance the baroclinic instability energy in this area, while the latter is mainly achieved by changing the local wind field in the northern South China Sea to produce wind stress curl anomaly. In addition, the mesoscale eddy in the southeastern Tropical Indian Ocean is also affected by the Indian Ocean Dipole, while the correlation between the mesoscale eddy in the northern South China Sea and the Indian Ocean Dipole is weak.
- southeastern tropical Indian Ocean,
- northern South China Sea,
- mesoscale eddy,
- statistical characteristics,
- seasonal variation,
- interannual variation

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