Identification and analysis of mesoscale eddies in the Northwestern Pacific Ocean from 1993-2014 based on altimetry data

Cui Wei; Wang Wei; Ma Yi; Yang Jungang

doi:10.3969/j.issn.0253-4193.2017.02.002

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Cui Wei, Wang Wei, Ma Yi, Yang Jungang. Identification and analysis of mesoscale eddies in the Northwestern Pacific Ocean from 1993-2014 based on altimetry data[J]. Haiyang Xuebao, 2017, 39(2): 16-28. doi: 10.3969/j.issn.0253-4193.2017.02.002

Citation:

Cui Wei, Wang Wei, Ma Yi, Yang Jungang. Identification and analysis of mesoscale eddies in the Northwestern Pacific Ocean from 1993-2014 based on altimetry data[J]. Haiyang Xuebao, 2017, 39(2): 16-28. doi: 10.3969/j.issn.0253-4193.2017.02.002

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Identification and analysis of mesoscale eddies in the Northwestern Pacific Ocean from 1993-2014 based on altimetry data

doi: 10.3969/j.issn.0253-4193.2017.02.002

1.
Key Laboratory of Physical Ocanography, Ocean University of China, Ministry of Education, Qingdao 266061, China;First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China
2.
Key Laboratory of Physical Ocanography, Ocean University of China, Ministry of Education, Qingdao 266061, China
3.
First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China

Received Date: 2015-12-02
Rev Recd Date: 2016-09-19

Abstract

Abstract

Eddy properties in the Northwestern Pacific Ocean are studied from 22 years of AVISO altimeter data using a SLA-based eddy identification approach. 3 841 cyclones and 2 836 anticyclones with lifetimes that exceed 30 days are detected during the 22-year period, and there is a preference for cyclones for most of lifetimes and propagation distances. Most mesoscale eddies propagate westward, the westward eddies are distributed everywhere of the area, as well as the eastward eddies occur mainly along Kuroshio Current and in Kuroshio Extension. Eddies exist principally in the latitude band of 15°-30°N, especial in the region near Kuroshio Current. The cyclones prefer to occur in the northern and southern of the area, while anticyclones mainly occur in the Subtropical Countercurrent. There are higher EKE, eddy amplitudes and eddy radii in The Kuroshio Extension of 30°-35°N. Cyclones and anticyclones occur more often in spring than in other seasons. The interannual variability of eddies activities is not obvious, the number of eddies generated every year are distributed in the range of 270-330. The comparison of the monthly variations of the numbers of eddies with Multivariate ENSO Index (MEI) shows that the eddy activities of Northwestern Pacific Ocean do not directly related with the ENSO phenomena.
- mesoscale eddy,
- Northwestern Pacific,
- altimetry data,
- eddy characteristic,
- interannual variability

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References(22)

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