Scaling Surface Mixing/Mixed Layer Depth under Stabilizing Buoyancy Flux
Scaling Surface Mixing/Mixed Layer Depth under Stabilizing Buoyancy Flux
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DOI：
10.1175/jpo-d-13-0190.1
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发表时间：
2015-01
影响因子：
3.5
通讯作者：
Y. Yoshikawa
中科院分区：
文献类型：
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作者：
Y. Yoshikawa
摘要本文研究了地球自转和稳定表面浮力通量对近地层风诱导湍流混合的综合影响。两种不同的长度尺度，Garwood尺度和Zilitinkevich尺度，已被提出的稳定混合层的深度在地球自转。在这里，本研究分析了观察到的混合层深度加上表面动量和浮力通量从阿尔戈浮标和卫星，发现Zilitinkevich规模更适合观察到的混合层深度比Garwood规模。大涡模拟（LES）重现这一观察到的功能，除了在弱稳定通量的混合层深度不能确定与浮力阈值方法（因为不足的浮力差在整个混合层基地）。然而，LES表明，混合层深度，如果定义与浮力比相对于其表面值如下Zilitinkevich规模，即使在这样一个弱的稳定通量。所以S…
AbstractThis study concerns the combined effects of Earth’s rotation and stabilizing surface buoyancy flux upon the wind-induced turbulent mixing in the surface layer. Two different length scales, the Garwood scale and Zilitinkevich scale, have been proposed for the stabilized mixing layer depth under Earth’s rotation. Here, this study analyzes observed mixed layer depth plus surface momentum and buoyancy fluxes obtained from Argo floats and satellites, finding that the Zilitinkevich scale is more suited for observed mixed layer depths than the Garwood scale. Large-eddy simulations (LESs) reproduce this observed feature, except under a weak stabilizing flux where the mixed layer depth could not be identified with the buoyancy threshold method (because of insufficient buoyancy difference across the mixed layer base). LESs, however, show that the mixed layer depth if defined with buoyancy ratio relative to its surface value follows the Zilitinkevich scale even under such a weak stabilizing flux. LESs also s...