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Instability in boundary layer between the North Equatorial Current and underlying zonal jets based on mooring observations
- Journal of Oceanology and Limnology Vol. 38, Issue 5, Pages: 1368-1381(2020)
- 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：
DOI：10.1007/s00343-020-0015-8
CLC：Received：16 January 2020，
Accepted：19 March 2020，
Online First：09 April 2020，
Published：2020-09
- Accepted：
Scan QR Code
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.
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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