Variable behavior in pycnocline mixing over shelf seas
Variable behavior in pycnocline mixing over shelf seas
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DOI：
10.1029/2012gl054638
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发表时间：
2013-01
影响因子：
5.2
通讯作者：
M. Palmer;J. Polton;M. Inall;T. Rippeth;J. A. M. Green;J. Sharples;J. Simpson
中科院分区：
文献类型：
--
作者：
M. Palmer;J. Polton;M. Inall;T. Rippeth;J. A. M. Green;J. Sharples;J. Simpson
垂直混合，在海洋湍流的驱动下，支撑着许多关键的相互作用，使地球上的生命蓬勃发展，因为垂直浮力通量维持全球翻转环流和垂直营养通量是至关重要的初级生产。因此，海洋系统的预测取决于湍流过程的准确模拟，而湍流过程本质上是混沌的。一个不断增长的证据基础存在，提供洞察这些复杂的过程，并允许调查湍流相对于更好地确定，因此可预测的参数。本文在“稳定性空间”中考察了三个湍动能耗散率（ε）的时间序列。我们揭示了一个有序的结构内的平均分布的ε，比较以及各种海洋湍流模型的建议。然而，对不同地点特定调谐的要求和仅部分成功的要求引起了对此类模型中“缺失物理”和测量技术有效性的质疑。
Vertical mixing, driven by turbulence in the ocean, underpins many of the critical interactions that allow life on earth to flourish since vertical buoyancy flux maintains global overturning circulation and vertical nutrient fluxes are critical to primary production. Prediction of the ocean system is therefore dependent on accurate simulation of turbulent processes that, by their very nature, are chaotic. A growing evidence base exists that provides insight into these complex processes and permits investigation of turbulence relative to better determined, and therefore predictable, parameters. Here we examine three time series of the dissipation rate of turbulent kinetic energy (ε) in “stability space”. We reveal an ordered structure within the mean distribution of ε that compares well to a variety of proposed models of oceanic turbulence. The requirement for differing site‐specific tuning and only partial success however raises questions over “missing physics” within such models and the validity of measurement techniques.