Responses of a warm mesoscale eddy to bypassed typhoon Megi in the South China Sea

LI Sheng; XUAN Jiliang; HUANG Daji

doi:10.3969/j.issn.1001-909X.2024.02.001

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Journal of Marine Sciences ›› 2024, Vol. 42 ›› Issue (2) : 1-14. DOI: 10.3969/j.issn.1001-909X.2024.02.001

Responses of a warm mesoscale eddy to bypassed typhoon Megi in the South China Sea

LI Sheng ¹^,²^,³^,⁴ ,
XUAN Jiliang ²^,³^,^* ,
HUANG Daji ¹^,²^,³

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Abstract

Based on multi-platform observed data, an unexpected response of a warm mesoscale eddy to bypassed typhoon Megi in the South China Sea in 2010 was observed and investigated. During the passage of typhoon Megi, the SLA maximum of the warm eddy increased from 30 to 36 cm, the radius increased from 78 to 116 km, the eddy kinetic energy increased from 166 to 303 m²/s², and the amplitude increased from 3 to 9 cm. On the right side of the typhoon, the thermocline water at Argo station on the edge of the warm eddy sank by 20 to 40 m. Diagnosis of the wind stress curl alone indicates that the warm eddy should be weaken and the thermocline should be raised, which are inconsistent with the observation results. Diagnosis based on the reanalysis sea surface velocity indicates that during the passage of typhoon Megi, the water diverges below the typhoon path, while the water converges on the right side of the path in the warm eddy region, and the SLA maximum as well as the amplitude of warm eddy are positively correlated with the convergence intensity. Estimation based on the reanalysis sea surface velocity also indicates that the water at Argo station will sink 29 m. Both the warm eddy characteristics and the thermocline depression are consistent with the observation. The case study shows that the response of mesoscale eddy on the edge of typhoon influence to typhoon is constrained not only by wind stress curl but also by the oceanic background conditions, and further attentions are required to explore the corresponding response and mechanism of upper ocean to typhoon.

Key words

typhoon / warm eddy / enhance / wind stress / convergence

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LI Sheng , XUAN Jiliang , HUANG Daji. Responses of a warm mesoscale eddy to bypassed typhoon Megi in the South China Sea[J]. Journal of Marine Sciences. 2024, 42(2): 1-14 https://doi.org/10.3969/j.issn.1001-909X.2024.02.001

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