Seasonal variation of mesoscale eddies in the Andaman Sea

Lin Zhentao; Xie Lingling; Huang Runqi; Bai Peng

doi:10.12284/hyxb2023035

Volume 45 Issue 4

Mar. 2023

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Lin Zhentao，Xie Lingling，Huang Runqi, et al. Seasonal variation of mesoscale eddies in the Andaman Sea[J]. Haiyang Xuebao，2023, 45(4)：1–16 doi: 10.12284/hyxb2023035

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Lin Zhentao，Xie Lingling，Huang Runqi, et al. Seasonal variation of mesoscale eddies in the Andaman Sea[J]. Haiyang Xuebao，2023, 45(4)：1–16 doi: 10.12284/hyxb2023035

Citation:

Lin Zhentao，Xie Lingling，Huang Runqi, et al. Seasonal variation of mesoscale eddies in the Andaman Sea[J]. Haiyang Xuebao，2023, 45(4)：1–16 doi: 10.12284/hyxb2023035

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Seasonal variation of mesoscale eddies in the Andaman Sea

doi: 10.12284/hyxb2023035

Lin Zhentao^1
,,
Xie Lingling^{1, 2, 3
,
,},
Huang Runqi¹,
Bai Peng^{1, 2}

1.
Laboratory of Coastal Ocean Variation and Disaster Prediction, College of Oceanology and Meteorology, Guangdong Ocean University, Zhanjiang 524088, China
2.
Guangdong Key Laboratory of Climate, Resource and Environment in Continental Shelf Sea and Deep Ocean, Zhanjiang 524088, China
3.
Key Laboratory of Space Ocean Remote Sensing and Application, Ministry of Natural Resources, Beijing 100081, China

Received Date: 2022-02-08
Rev Recd Date: 2022-08-03

Available Online: 2022-10-27

Publish Date: 2023-03-31

Abstract

Abstract

Using mesoscale eddy trajectory product from 1993 to 2019 provided by the AVISO, this study analyzes the climatology characteristics and seasonal variations of mesoscale eddies in the Andaman Sea (AS). The results show that a total of 328 mesoscale eddies were generated in the AS during the past 27 years, of which anticyclonic eddies (AEs) (171) were more than cyclonic eddies (CEs) (157). The eddies are mainly distributed in the deep waters of the central and western basin of the AS. The average life span of total eddies is 46.4 days, with average eddy radius of 111.8 km, average amplitude of 4.7 cm, rotating and propagating speeds of 24.8 cm/s and 15.0 cm/s, respectively. The AEs have large radius, amplitude, and rotating speed than CEs, but smaller propagating speed. During the eddy life, the composite radius, amplitude, and rotating speed of eddies all increase in the generation stage and then decrease in dissipation stage, while the eddy propagation speed has opposite trend. For the seasonal variation, the comparison of AEs to CEs shows seesaw phenomena in winter and summer, CEs are stronger and larger than AEs in summer, but weaker and smaller in winter. The distribution of AEs and CEs also shows seasonal polarity reversal, a ‘CEs-AEs-CEs’ pattern from north to south in summer, but a reversed ‘AEs-CEs-AEs’ pattern in winter. Dynamic analysis showed that the vorticity of background current may affect the alternating distribution pattern of mesoscale eddies in the AS, in which positive (negative) vorticity favors CEs (AEs). The energy analysis shows that wind forcing is dominant in the eddy kinetic energy (EKE) variation, and the seasonal wind work is coherent to the EKE variation in the AS.
- Andaman Sea,
- mesoscale eddy,
- statistical features,
- seasonal variation,
- polarity distribution reversal

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References(46)

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