Intraseasonal variability of the Kuroshio east of Taiwan, China, observed by subsurface mooring during 2016-2017

Qiang REN; Fei YU; Feng NAN; Jianfeng WANG; Anqi XU

doi:10.1007/s00343-020-9286-3

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Intraseasonal variability of the Kuroshio east of Taiwan, China, observed by subsurface mooring during 2016-2017

Physics | Updated：2023-04-27

- Intraseasonal variability of the Kuroshio east of Taiwan, China, observed by subsurface mooring during 2016-2017
- Journal of Oceanology and Limnology Vol. 38, Issue 5, Pages: 1408-1420(2020)
- Affiliations：
  
  1.CAS Key Laboratory of Ocean Circulation and Wave Studies, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
  2.University of Chinese Academy of Sciences, Beijing 100049, China
  3.Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China
  4.Pilot National Laboratory for Marine Science and Technology(Qingdao), Qingdao 266071, China
- Author bio：
  
  YU Fei, yuf@qdio.ac.cn
- Funds：
- DOI：10.1007/s00343-020-9286-3
  CLC：
- Received：18 November 2019，
  
  Accepted：30 December 2019，
  
  Online First：15 June 2019，
  
  Published：2020-09
- Accepted：
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Qiang REN, Fei YU, Feng NAN, et al. Intraseasonal variability of the Kuroshio east of Taiwan, China, observed by subsurface mooring during 2016-2017[J]. Journal of Oceanology and Limnology, 2020, 38(5): 1408-1420.
DOI：

Qiang REN, Fei YU, Feng NAN, et al. Intraseasonal variability of the Kuroshio east of Taiwan, China, observed by subsurface mooring during 2016-2017[J]. Journal of Oceanology and Limnology, 2020, 38(5): 1408-1420. DOI： 10.1007/s00343-020-9286-3.

摘要

Abstract

The mean velocity structure and variability of the Kuroshio east of Taiwan

China

were investigated using mooring observations acquired at 23°N/122°E between January 2016 and May 2017. Power spectrum analysis reveals marked intraseasonal variability in 70-95 days in the meridional Kuroshio velocity in the upper 800 m. Hybrid Coordinate Ocean Model assimilation data adequately reproduce variations of the Kuroshio. Westward propagating mesoscale eddies that originated from the Subtropical Countercurrent play an important role in intraseasonal variability in the Kuroshio velocity. Cyclonic (anticyclonic) eddies are often associated with negative (positive) sea surface height anomaly

resulting in positive (negative) potential vorticity in the subsurface layer of the eddy center

which decreases (increases) isopycnal slope and then weakens (strengthens) the Kuroshio. When anticyclonic (cyclonic) eddies are active

the Kuroshio axis moves offshore (inshore). Corresponding to the Kuroshio intraseasonal variability (ISV)

the variation of the intermediate water salinity also had a significant ISV induced by the mesoscale eddies.

关键词

Keywords

references

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