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

Journal of Oceanology and Limnology 2021年第5期39卷 1634-1650页

作者： Xingyu SHI Zhenyan WANG Haijun HUANG CAS Key Laboratory of Marine Geology and Environment Institute ofOceanologyChinese Academy of SciencesQingdao 266071China Laboratory for Marine Mineral Resources Pilot National Laboratory forMarine Science and Technology(Qingdao)Qingdao 266237China University of Chinese Academy of Sciences Beijing 100049China Center for Ocean Mega-Science Chinese Academy of SciencesQingdao266071China

Physical oceanography plays an important role in the formation of submarine sediments,and the distribution of nutriments and biocenoses in *** M4 seamount is located in the Caroline Island Ridge of the Western Pacific *** 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 *** found that the water in the upper 200 m is controlled by the westward North Equatorial Current(NEC),while the water between 300-1000 m is dominated by the eastward North Equatorial Undercurrent(NEUC).The current direction fluctuates significantly below 300 m at upstream *** the same depth of the lee sides,the current direction changes with the distance from *** are likely caused by the obstacle of M4 *** calculation results show that there is an anticyclonic cap above M4 seamount caused by tidal *** currents in M4 seamount are squeezed by the topography and amplified,and the amplified tidal currents play a dominant role in M4 ***,the circulation system generated by the interaction of the amplified tidal current and M4 seamount drives the upward/downward movement of the ***,the thickness of the surface turbulent layer is changed with the tidal ***,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 *** 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： Caroline seamount tropical Western Pacific Ocean currents water masses tides turbulent diffusivities

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