Physical oceanography of the Caroline M4 seamount in the tropical Western Pacific Ocean in summer 2017

Xingyu SHI; Zhenyan WANG; Haijun HUANG

doi:10.1007/s00343-021-0359-8

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Physical oceanography of the Caroline M4 seamount in the tropical Western Pacific Ocean in summer 2017

Seamount physicochemical environments | Updated：2023-04-27

- Physical oceanography of the Caroline M4 seamount in the tropical Western Pacific Ocean in summer 2017
- Journal of Oceanology and Limnology Vol. 39, Issue 5, Pages: 1634-1650(2021)
- Affiliations：
  
  1.CAS Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
  2.Laboratory for Marine Mineral Resources, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China
  3.University of Chinese Academy of Sciences, Beijing 100049, China
  4.Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China
- Author bio：
  
  Zhenyan WANG, E-mail: zywang@qdio.ac.cn
- Funds：
- DOI：10.1007/s00343-021-0359-8
  CLC：
- Received：21 September 2020，
  
  Accepted：16 November 2020，
  
  Online First：21 January 2021，
  
  Published：2021-09
- Accepted：
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Xingyu SHI, Zhenyan WANG, Haijun HUANG. Physical oceanography of the Caroline M4 seamount in the tropical Western Pacific Ocean in summer 2017[J]. Journal of Oceanology and Limnology, 2021, 39(5): 1634-1650.
DOI：

Xingyu SHI, Zhenyan WANG, Haijun HUANG. Physical oceanography of the Caroline M4 seamount in the tropical Western Pacific Ocean in summer 2017[J]. Journal of Oceanology and Limnology, 2021, 39(5): 1634-1650. DOI： 10.1007/s00343-021-0359-8.

摘要

Abstract

Physical oceanography plays an important role in the formation of submarine sediments

and the distribution of nutriments and biocenoses in seamounts. The M4 seamount is located in the Caroline Island Ridge of the Western Pacific Ocean. The physical properties around M4 seamount are preliminarily analyzed based on the in-situ data obtained in summer 2017 in Caroline M4 seamount and open-sourced data. We found that the water in the upper 200 m is controlled by the westward North Equatorial Current (NEC)

while the water between 300-1 000 m is dominated by the eastward North Equatorial Undercurrent (NEUC). The current direction fluctuates significantly below 300 m at upstream stations. At the same depth of the lee sides

the current direction changes with the distance from seamount. These are likely caused by the obstacle of M4 seamount. The calculation results show that there is an anticyclonic cap above M4 seamount caused by tidal rectification. Tidal currents in M4 seamount are squeezed by the topography and amplified

and the amplified tidal currents play a dominant role in M4 seamount. First

the circulation system generated by the interaction of the amplified tidal current and M4 seamount drives the upward/downward movement of the isotherms. Secondly

the thickness of the surface turbulent layer is changed with the tidal phase. Thirdly

high turbulent diffusivities are found in the bottom of M4 seamount

and these are most likely attributed to the turbulent mixing induced by the mutual effect between semidiurnal tidal currents and steep bathymetry. This article of physical oceanography provides scientific basis for further analysis of the distribution of biological community and deposition mechanism in M4 seamount.

关键词

Keywords

references

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Related Institution

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Laboratory for Marine Ecology and Environmental Science, Pilot National Laboratory for Marine Science and Technology (Qingdao)

CAS Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences

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