Observed spatiotemporal variation of three-dimensional structure and heat/salt transport of anticyclonic mesoscale eddy in Northwest Pacific

Jun DAI; Huizan WANG; Weimin ZHANG; Yuzhu AN; Ren ZHANG

doi:10.1007/s00343-019-9148-z

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Observed spatiotemporal variation of three-dimensional structure and heat/salt transport of anticyclonic mesoscale eddy in Northwest Pacific

Special Section on Indo-Pac Project | Updated：2023-04-27

- Observed spatiotemporal variation of three-dimensional structure and heat/salt transport of anticyclonic mesoscale eddy in Northwest Pacific
- Journal of Oceanology and Limnology Vol. 38, Issue 6, Pages: 1654-1675(2020)
- Affiliations：
  
  1.College of Meteorology and Oceanography, National University of Defense Technology, Changsha 410073, China
  2.P. O. Box 5111, Beijing 100094, China
- Author bio：
  
  WANG Huizan, wanghuizan@126.com
- Funds：
- DOI：10.1007/s00343-019-9148-z
  CLC：
- Received：07 June 2019，
  
  Accepted：29 July 2019，
  
  Online First：27 September 2019，
  
  Published：2020-11
- Accepted：
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Jun DAI, Huizan WANG, Weimin ZHANG, et al. Observed spatiotemporal variation of three-dimensional structure and heat/salt transport of anticyclonic mesoscale eddy in Northwest Pacific[J]. Journal of Oceanology and Limnology, 2020, 38(6): 1654-1675.
DOI：

Jun DAI, Huizan WANG, Weimin ZHANG, et al. Observed spatiotemporal variation of three-dimensional structure and heat/salt transport of anticyclonic mesoscale eddy in Northwest Pacific[J]. Journal of Oceanology and Limnology, 2020, 38(6): 1654-1675. DOI： 10.1007/s00343-019-9148-z.

摘要

Abstract

As in-situ observations are sparse

targeted observations of a specific mesoscale eddy are rare. Therefore

it is difficult to study the three-dimensional structure of moving mesoscale eddies. From April to September 2014

an anticyclonic eddy located at 135°E-155°E

26°N-42°N was observed using 17 rapidsampling Argo floats

and the spatiotemporal variations in the three-dimensional structure were studied. The results are as follows:(1) the eddy was identified and tracked using satellite altimeter data. It had a lifetime of 269 days and an average radius of 91.5 km. The lifetime of the eddy can be divided into three phases

i.e.

the initiation

maturity

and termination phases. The depth of its influence reached 1 000 m; (2) the Argo profiles were divided into seven periods (approximately 20 days in each) for composite analysis

and the composite Argo profiles and CARS2009 (CSIRO Atlas of Regional Seas) climatology data were merged following the data-interpolating variational analysis (DIVA) method to reconstruct the three-dimensional structure. The temperature and salinity anomaly cores of the anticyclonic mesoscale eddy are located from 400 to 600 m. From 800 to 900 m

there is an area of low salinity at the center of the eddy. A high concentration anomaly of dissolved oxygen was located at approximately 250 m; (3) to better understand the features of the eddy and its interaction with the surroundings

we calculated the anomalous velocity of the geostrophic flow and the heat

salt

dissolved oxygen transport anomaly

and discussed the eddy's origin and its adjustments to topography. The maximum heat

salt

and oxygen transport caused by eddy were 9.37×10

3.08×10

kg/s

and 2.70×10

kg/s

which all occurred during the termination phase. This study highlights the applicability of using Argo floats to understand the three-dimensional structure thermohaline features of eddies in the North Pacific.

关键词

Keywords

references

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