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首页> 外文期刊>Journal of Physical Oceanography >Near-Field Wind Mixing and Implications on Parameterization from Float Observations
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Near-Field Wind Mixing and Implications on Parameterization from Float Observations

机译：近场风混合和浮动观测参数化的影响

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摘要

Part of near-inertial wind energy dissipates locally below the surface mixed layer. Here, their role in the climate system is studied by adopting near-inertial, near-field wind-mixing parameterization to a coarse-forward ocean general circulation model. After confirming a problem with the parameterization in the equatorial region, we investigate effects of near-field wind mixing due to storm track activities in the North Pacific. We found that, in the center of the Pacific decadal oscillation (PDO) around 170 degrees W in the midlatitude, near-field wind mixing transfers the PDO signal into deeper layers. Since the results suggest that near-field wind mixing is important in the climate system, we also compared the parameterization with velocity observations by a float in the North Pacific. The float observed abrupt and local propagation of near-inertial internal waves and shear instabilities in the main thermocline along the Kuroshio Extension for 460 km. Vertical diffusivities inferred from the parameterization do not reproduce the enhanced diffusivities in the deeper layer inferred from the float. Wave-ray tracing indicates that wave trapping near the Kuroshio front is responsible for the elevated diffusivities. Therefore, enhanced mixing due to trapping should be included in the parameterization.
机译：近乎惯性风能的一部分在表面混合层下方局部散发。在这里，通过采用近惯性近场风力混合参数化来研究气候系统中的其在气候系统中的作用。在确认赤道地区参数化问题之后，我们研究了北太平洋风暴轨道活动近场风混合的影响。我们发现，在中位数（PDDO）的中央在中间的中央，在中间地区约为170度，近场风混合将PDO信号转移到更深层。由于结果表明，近场风混合在气候系统中很重要，我们也将参数化与北太平洋的浮点数进行了速度观测。浮动观察到沿着Kuroshio延伸的主热量下的近惯性内波和剪切稳定性的突然和局部繁殖，沿着Kuroshio延伸，460公里。从参数化推断的垂直扩散性不会再现从浮子推断的更深层中的增强的扩散性。波浪射线跟踪表示Kuroshio前面附近的波浪捕获负责升高的扩散性。因此，应在参数化中包括捕获引起的增强混合。

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