Statistical characteristics of mesoscale eddies in the two western boundary current extension regions

Hu Dong; Chen Xi; Zhao Yanling; Li Yan; Mao Kefeng; Jiang Hongfeng; Wang Dongliang

doi:10.3969/j.issn.0253-4193.2018.06.002

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Hu Dong, Chen Xi, Zhao Yanling, Li Yan, Mao Kefeng, Jiang Hongfeng, Wang Dongliang. Statistical characteristics of mesoscale eddies in the two western boundary current extension regions[J]. Haiyang Xuebao, 2018, 40(6): 15-28. doi: 10.3969/j.issn.0253-4193.2018.06.002

Citation:

Hu Dong, Chen Xi, Zhao Yanling, Li Yan, Mao Kefeng, Jiang Hongfeng, Wang Dongliang. Statistical characteristics of mesoscale eddies in the two western boundary current extension regions[J]. Haiyang Xuebao, 2018, 40(6): 15-28. doi: 10.3969/j.issn.0253-4193.2018.06.002

Citation:

Hu Dong, Chen Xi, Zhao Yanling, Li Yan, Mao Kefeng, Jiang Hongfeng, Wang Dongliang. Statistical characteristics of mesoscale eddies in the two western boundary current extension regions[J]. Haiyang Xuebao, 2018, 40(6): 15-28. doi: 10.3969/j.issn.0253-4193.2018.06.002

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Statistical characteristics of mesoscale eddies in the two western boundary current extension regions

doi: 10.3969/j.issn.0253-4193.2018.06.002

1.
The 31010 Army of PLA, Beijing 100081, China
2.
College of Meteorology and Oceanography, National University of Defense Technology, Nanjing 211101, China

Received Date: 2017-07-13
Rev Recd Date: 2017-10-30

Abstract

Abstract

Kuroshio and Gulf Stream are the two most typical western boundary currents in the world's ocean, and mesoscale eddies are very active in Kuroshio Extention (KE) and Gulf Stream extension (GSE) regions. In this paper, surface features of mesoscale eddies in KE and GSE regions and their effects on temperature and salinity fields are studied and compared using satellite altimeter data and Argo buoy data. The results show that eddy frequency is extremely high and eddy intensity is obviously larger near the main axes of both Kuroshio and Gulf stream, and cyclonic eddies (CE) and anticyclonic eddies (AE) dominate in the south and north sides of the main axes, respectively. Most eddies propagate westward with a little southward (equatorward) deflection. The amount of eddies in the two regions are both larger in summer and autumn, and eddy intensities are larger in spring and summer, meanwhile intensities of eddies in GSE are larger than those in KE. CE (AE) cause consistent negative (positive) temperature anomaly. CE (AE) in KE represent "negative-positive" ("positive-negative") salinity anomaly distribution from upper to lower layers, while CE (AE) in GSE exhibit a more consistent negative (positive) salinity anomaly in each layer. The average effect of mesoscale eddies on temperature and salinity fields in the two regions can reach more than 1 000×10⁴ Pa depths.
- western boundary current,
- Kuroshio extension,
- Gulf Stream extension,
- mesoscale eddies,
- statistical characteristics

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