Assessment of fine-scale parameterizations of turbulent dissipation rates near mixing hotspots in the deep ocean
Assessment of fine-scale parameterizations of turbulent dissipation rates near mixing hotspots in the deep ocean
复制标题
DOI：
10.1029/2012gl054068
复制
发表时间：
2012-12-18
影响因子：
5.2
通讯作者：
Robertson, Robin
中科院分区：
文献类型：
--
作者：
Hibiya, Toshiyuki;Furuichi, Naoki;Robertson, Robin
基于剪切和/或应变的精细尺度参数化的湍流耗散率在深海附近的地形特征，内波谱偏离Garrett-Munk（GM）成为错误的。虽然Gregg-Henyey-Polzin（GHP）参数化包含了这种光谱偏差，但其适用性仍然不确定。我们评估“alpha”和“beta”，分别代表高频（2f < omega < N）和低频（f < omega < 2f）波段的局部内波能量，使用在混合热点附近同时测量的细尺度垂直剪切和应变，通过GM中相应的值进行缩放。在产生高频内波的粗略水深测量中，局部内波谱偏向于较高频率（α/β>> 1），而它们偏向于较低频率（α/β
Shear-based and/or strain-based fine-scale parameterizations of turbulent dissipation rates in the deep ocean become erroneous near topographic features where internal wave spectra deviate from Garrett-Munk (GM). Although the Gregg-Henyey-Polzin (GHP) parameterization incorporates this spectral deviation, the applicability remains uncertain. We evaluate "alpha" and "beta" representing the local internal wave energy in the high frequency (2f < omega < N) and low frequency (f < omega < 2f) bands, respectively, scaled by their corresponding values in GM using fine-scale vertical shear and strain simultaneously measured near mixing hotspots. The local internal wave spectra are biased toward higher frequencies (alpha/beta >> 1) over rough bathymetry where high frequency internal waves are generated, whereas they are biased toward lower frequencies (alpha/beta