Oceanic vertical mixing of the lower halocline water in the Chukchi Borderland and Mendeleyev Ridge

Long Lin Hailun He Yong Cao Tao Li Yilin Liu Mingfeng Wang

Long Lin, Hailun He, Yong Cao, Tao Li, Yilin Liu, Mingfeng Wang. Oceanic vertical mixing of the lower halocline water in the Chukchi Borderland and Mendeleyev Ridge[J]. Acta Oceanologica Sinica. doi: 10.1007/s13131-021-1825-z
Citation: Long Lin, Hailun He, Yong Cao, Tao Li, Yilin Liu, Mingfeng Wang. Oceanic vertical mixing of the lower halocline water in the Chukchi Borderland and Mendeleyev Ridge[J]. Acta Oceanologica Sinica. doi: 10.1007/s13131-021-1825-z

doi: 10.1007/s13131-021-1825-z

Oceanic vertical mixing of the lower halocline water in the Chukchi Borderland and Mendeleyev Ridge

Funds: The National Natural Science Foundation of China under contract NO. 42006037, the Chinese Polar Environmental Comprehensive Investigation & Assessment Programs, Grant from the Scientific Research Fund of the Second Institute of Oceanography, MNR under contract NO. JB904, and the National Key R&D Program of China under contract NO. 2019YFC1509102.
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  • Figure  1.  Hydrographic and turbulent stations of the 7th Chinese National Arctic Research Expedition in the Chukchi Borderland and Mendeleyev Ridge of the Arctic Ocean in the summer of 2016. CTD stations are marked as red dots; stations with quality sADCP data are marked as red squares; and VMP stations are marked as red circles. The colormap shows the bathymetry.

    Figure  2.  T-S diagram of all stations.

    Figure  3.  Potential temperature (a, b), salinity (c, d), and buoyancy frequency (e, f) sections of sections P1 (left) and E (right). White dash lines are the isopycnals of 26 kg/m3 and 27 kg/m3.

    Figure  4.  Buoyancy frequency N2 (a), vertical shear S2 (b) and Richardson number Ri (c) of each section. Upper red line is the isohaline of 33.6, and lower red line is the isohaline of 34.6.

    Figure  5.  Profiles of dissipation rate (a) and diapycnal diffusivity (b) of each station. Vertical black curve line represents the potential temperature profile, and LHW in temperature profile is marked with red color. The unit of ε is W/kg, and the unit of κρ is m2/s.

    Figure  6.  Spatial distribution of depth-averaged dissipation rate ε (a), diapycnal diffusivity κρ (b), temperature gradient dT/dt (c), and vertical heat flux FH (d) in LHW for each section. The unit of ε is W/kg, and the unit of κρ is m2/s.

    Figure  7.  Profile of double diffusive staircase potential temperature (a), salinity (b), and diffusivity comparison between observation (blue) and parameterization (red) in R20 in Mn AP (c).

    Figure  8.  Depth-averaged dissipation rate (blue) and strain variance in lower halocline water (red) of each station. Black pluses mark where double-diffusive staircases were observed.

    Figure  9.  Depth-averaged dissipation rate in lower halocline water and surface wind stress.

    Figure  10.  Depth-averaged dissipation rate in lower halocline water and semidiurnal tidal energy. The unit of ε is W/kg, and the unit of ETK is J/m.

    Table  1.   Comparison of the depth averaged diffusivity between observation and parameterization where double diffusion occurred in LHW.

    Station nameObserved dissipation rate
    ε/(10–9 W·kg–1)
    Diffusivity derived from observed
    dissipation rate κ/(10–6 m2·s–2)
    Diffusivity based on double-diffusive
    theory κ/(10–6 m2·s–2)
    E241.577.905.16
    E261.146.696.49
    R201.477.895.38
    R211.449.555.90
    P261.016.755.05
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  • 收稿日期:  2021-02-02
  • 录用日期:  2021-03-09
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