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首页> 外文期刊>Journal of Physical Oceanography >Global Abyssal Mixing Inferred from Lowered ADCP Shear and CTD Strain Profiles
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Global Abyssal Mixing Inferred from Lowered ADCP Shear and CTD Strain Profiles

机译：从降低的ADCP剪切和CTD应变曲线推断出全球深渊混合

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Internal wave-wave interaction theories and observations support a parameterization for the turbulent dissipation rate E and eddy diffusivity K that depends on internal wave shear < V_z~2 > and strain < ξ_z~2 > variances. Its latest incarnation is applied to about 3500 lowered ADCP/CTD profiles from the Indian, Pacific, North Atlantic, and Southern Oceans. Inferred diffusivities K are functions of latitude and depth, ranging from 0.03 X 10~(-4) m~2 s~(-1) within 2° of the equator to (0.4-0.5) x 10~(-4) m~2 s~(-1) at 50°-70°. Diffusivities K also increase with depth in tropical and subtropical waters. Diffusivities below 4500-m depth exhibit a peak of 0.7 X 10~(-4) m~2 s~(-1) between 20° and 30°, latitudes where semidiurnal parametric subharmonic instability is expected to be active. Turbulence is highly heterogeneous. Though the bulk of the vertically integrated dissipation ∫_ε is contributed from the main pycnocline, hotspots in ∫_ε show some correlation with small-scale bottom roughness and near-bottom flow at sites where strong surface tidal dissipation resulting from tide-topography interactions has been implicated. Average vertically integrated dissipation rates are 1.0 mW m~(-2), lying closer to the 0.8 mW m~(-2) expected for a canonical (Garrett and Munk) internal wave spectrum than the global-averaged deep-ocean surface tide loss of 3.3 mW m~(-2).
机译：内部波-波相互作用理论和观测结果支持湍流耗散率E和涡流扩散系数K的参数化，该参数化取决于内部波切变和应变<ξ_z〜2>方差。它的最新化身应用于来自印度，太平洋，北大西洋和南大洋的约3500种降低的ADCP / CTD剖面图。推断的扩散系数K是纬度和深度的函数，范围从赤道2度以内的0.03 X 10〜（-4）m〜2 s〜（-1）到（0.4-0.5）x 10〜（-4）m〜在50°-70°下2 s〜（-1）。在热带和亚热带水域中，扩散系数K也随着深度的增加而增加。在4500 m深度以下的扩散率在20°至30°之间出现0.7 X 10〜（-4）m〜2 s〜（-1）的峰值，预计半日参量亚谐波不稳定性会活跃。湍流高度异构。尽管大部分的垂直积分耗散∫_ε是由主要的比诺克林贡献的，但∫_ε中的热点与由潮汐地貌相互作用引起的强表面潮汐耗散的部位的小尺度底部粗糙度和近底流有些相关。牵连。平均垂直积分耗散率是1.0 mW m〜（-2），比全球平均深海潮汐损失更接近规范（Garrett和Munk）内部波谱的0.8 mW m〜（-2）。 3.3 mW m〜（-2）

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