Statistical characteristics and path analysis of mesoscale eddy in the East China Sea

ZHANG Tao; LI Junyi; XIE Lingling; ZHENG Shaojun; ZHENG Huiyuan

doi:10.3969/j.issn.1001-909X.2020.01.009

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Journal of Marine Sciences ›› 2020, Vol. 38 ›› Issue (1) : 77-86. DOI: 10.3969/j.issn.1001-909X.2020.01.009

Statistical characteristics and path analysis of mesoscale eddy in the East China Sea

ZHANG Tao^1,2, LI Junyi^*1,2, XIE Lingling^1,2, ZHENG Shaojun^1,2, ZHENG Huiyuan¹

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Abstract

An Archiving Validation and Interpretation of Satellite Oceanographic(AVISO) mesoscale eddy tracking dataset from satellite altimeter during the period from 1993 to 2017 was used to classify the mesoscale eddies in the East China Sea(ECS) according to the path. The results show that 318 cyclones and 276 anticyclones were detected in the ECS during the 25-year period. These mesoscale eddies were classified into the following types according to the path: (1) Eddy generated on the continental shelf of the ECS intrudes into deep sea(148 cases); (2) Eddy generated in deep sea intrudes into the continental shelf of the ECS(35 cases); (3) Eddy spreads along the isobath(180 cases); (4) Eddy wanders around(121 cases); (5) Eddy generated in Pacific Ocean intrudes into the shelf area of the ECS(25 cases) and (6) Eddy generated in Pacific Ocean intrudes into the ECS(85 cases). There existed very obvious seasonality for these six types. And the seasonal distribution for cyclones and anticyclones is diverse. The quantity of eddies for the type 3 is higher in spring and summer, lower in autumn and winter. The distribution of eddies for the type 1 is more evenly. The quantity of cyclones for the type 1 is the lowest in summer, and higher in spring and winter. The seasonal distribution for mesoscale eddies is related to the variations of the Kuroshio. The mean lifetime of eddies for type 4 is the longest, about 44 days. The mean amplitudes of eddies for type 1 and 5 are the largest, about 13.2 cm. The maximum mean diameter of the eddies is for type 5, about 122 km. The mean lifetime, amplitude and diameter of eddies for type 6 are the smallest.

Key words

East China Sea continental shelf / mesoscale eddy / motion path

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ZHANG Tao, LI Junyi, XIE Lingling, ZHENG Shaojun, ZHENG Huiyuan. Statistical characteristics and path analysis of mesoscale eddy in the East China Sea[J]. Journal of Marine Sciences. 2020, 38(1): 77-86 https://doi.org/10.3969/j.issn.1001-909X.2020.01.009

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