Instability in boundary layer between the North Equatorial Current and underlying zonal jets based on mooring observations

Fujun WANG; Junqiao FENG; Qingye WANG; Linlin ZHANG; Shijian HU; Dunxin HU

doi:10.1007/s00343-020-0015-8

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Instability in boundary layer between the North Equatorial Current and underlying zonal jets based on mooring observations

Physics | Updated：2023-04-27

- Instability in boundary layer between the North Equatorial Current and underlying zonal jets based on mooring observations
- Instability in boundary layer between the North Equatorial Current and underlying zonal jets based on mooring observations
- 海洋湖沼学报（英文） 2020年38卷第5期页码：1368-1381
- Affiliations：
  
  1.Key Laboratory of Ocean Circulation and Wave, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
  2.Function Laboratory for Ocean Dynamics and Climate, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266000, China
  3.Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China
- Author bio：
  
  WANG Fujun, fujunwang@qdio.ac.cn
- Funds：
  
  the Strategic Priority Research Program of the Chinese Academy of Sciences(XDB42010102);the Hydrographic and Meteorological Survey in the Warm Pool Area of Western Pacific(2013FY111300);the National Natural Science Foundation of China(41776021);the National Natural Science Foundation of China(41421005);© Chinese Society for Oceanology and Limnology, Science Press, and Springer-Verlag Berlin Heidelberg 2020
- DOI：10.1007/s00343-020-0015-8
  中图分类号：
- 收稿：2020-01-16，
  
  录用：2020-3-19，
  
  网络首发：2020-04-09，
  
  纸质出版：2020-09
- Accepted：
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Instability in boundary layer between the North Equatorial Current and underlying zonal jets based on mooring observations[J]. 海洋湖沼学报（英文）, 2020,38(5):1368-1381.

Fujun WANG, Junqiao FENG, Qingye WANG, et al. Instability in boundary layer between the North Equatorial Current and underlying zonal jets based on mooring observations[J]. Journal of Oceanology and Limnology, 2020, 38(5): 1368-1381.
Instability in boundary layer between the North Equatorial Current and underlying zonal jets based on mooring observations[J]. 海洋湖沼学报（英文）, 2020,38(5):1368-1381. DOI： 10.1007/s00343-020-0015-8.

Fujun WANG, Junqiao FENG, Qingye WANG, et al. Instability in boundary layer between the North Equatorial Current and underlying zonal jets based on mooring observations[J]. Journal of Oceanology and Limnology, 2020, 38(5): 1368-1381. DOI： 10.1007/s00343-020-0015-8.

摘要

Abstract

Instability/stability in the North Equatorial Current (NEC) basin is studied based on data obtained from nine moorings deployed at 8.5°N

10.5°N

11.0°N

12.5°N

13.0°N

15.0°N

15.5°N

17.5°N

and 18.0°N along 130.0°E during cruises in 2015-2017. In low latitudes

the Coriolis parameter and stratification ratio play important roles in NEC stability

whereas velocity shear and the layer depth ratio are important for NEC stability in high latitudes. Beneath the westward NEC

eastward zonal jets occur intermittently centered around 8.5°N

12.5°N

and 17.5°N along 130.0°E. Similar to the NEC

the main body of these zonal jets also deepens with latitude. In the boundary layer comprising the bottom NEC and upper zonal jets

the growth rate of the NEC is attributed not only to velocity shear but also to zonal jet velocity based on the longwave assumption. Based on the shortwave assumption

the growth rate is proportional to zonal jet velocity but has no relationship with velocity shear. Climatologically

the growth rate in the boundary layer is not zero at 8.5°N

12.5°N

and 13.0°N

where the velocity shear and zonal jets are larger than at other stations. The instability also occurs at the time node when the zonal jets are strong enough

although the mean zonal jets may disappear at this station.

关键词

Keywords

references

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