Mean properties of mesoscale eddies in the Kuroshio recirculation region

Ma Libin; Wang Qiang

doi:10.1007/s00343-014-3029-2

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Mean properties of mesoscale eddies in the Kuroshio recirculation region

Updated：2023-05-16

- Mean properties of mesoscale eddies in the Kuroshio recirculation region
- Journal of Oceanology and Limnology Vol. 32, Issue 3, Pages: 681-702(2014)
- Affiliations：
  
  1. Key Laboratory of Ocean Circulation and Waves Institute of Oceanology Chinese Academy of Sciences
  2. University of Chinese Academy of Sciences
- Author bio：
- Funds：
- DOI：10.1007/s00343-014-3029-2
  CLC：
- Online First：04 May 2014，
  
  Published：2014
- Accepted：
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Ma, L., Wang, Q. Mean properties of mesoscale eddies in the Kuroshio recirculation region., Chin. J. Ocean. Limnol. 32, 681–702 (2014). https://doi.org/10.1007/s00343-014-3029-2
DOI：

Ma, L., Wang, Q. Mean properties of mesoscale eddies in the Kuroshio recirculation region., Chin. J. Ocean. Limnol. 32, 681–702 (2014). https://doi.org/10.1007/s00343-014-3029-2 DOI：

摘要

Abstract

Using a 19-year altimetric dataset

the mean properties and spatiotemporal variations of eddies in the Kuroshio recirculation region are examined. A total of 2 001 cyclonic tracks and 1 847 anticyclonic tracks were identified using a geometry-based eddy detection method. The mean radius was 57 km for cyclonic eddies and was 61 km for anticyclonic eddies

respectively

and the mean lifetime was about 10 weeks for both type eddies. There were asymmetric spatial distributions for eddy generation and eddy termination

which were domain-dependent. Mean eddy generation rates were 2.0 per week for cyclonic eddies and were 1.9 per week for anticyclonic eddies. Both type eddies tended to deform during their lifetime and had different propagation characteristics

which mainly propagated westward and southwestward with velocities 4.0–9.9 cm/s

in the Kuroshio recirculation region. Further discussion illustrates that the eddy westward speed maybe influenced by the combined effect of vertical shear of horizontal currents and nonlinearity of eddy. To better understand the evolution of eddy tracks

a total of 134 long-lived tracks (lifetime ≥20 weeks) were examined. Comparison between short-span eddies (lifetime ≥4 weeks and <20 weeks) and long-lived eddies is also conducted and the result shows that the short-span and long-lived eddies have similar time evolution. Finally

eddy seasonal variations and interannual changes are discussed. Correlation analysis shows that eddy activity is sensitive to the wind stress curl and meridional gradient of sea surface temperature on interannual timescales. Besides

the strength and orientation of background flows also have impacts on the eddy genesis.

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