A regime diagram for ocean geostrophic turbulence

A regime diagram for ocean geostrophic turbulence
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海洋地转湍流的状态图

DOI:
10.1002/qj.2833
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发表时间:
2016
影响因子:
8.9
通讯作者:
Klocker A
Klocker A
中科院分区:
地球科学3区
文献类型:
--
作者:
Klocker A

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通过绘制基于观测的无量纲涡动长度尺度的估计值与非线性参数(等于均方根涡动速度与斜压Rossby相速度之比)的关系,构造了海洋中地转湍流的二维状态图。比较了两种对涡流长度尺度的估计:从海面高度等值线所包围的区域推断出的等效涡流半径,以及基于去除平均流效应的涡流扩散率估计的“未抑制”混合长度。对于弱非线性,发现在热带,混合长度主要对应于斜压不稳定的稳定性阈值,而涡半径对应于莱茵尺度,有人建议,这种不匹配是指示的逆能量级联发生在低纬度的海洋和纬向伸长的涡。在中高纬度地区,当非线性系数较大时,涡旋长度尺度比稳定性阈值短得多,在Rossby变形半径的2.5倍以内。
A two‐dimensional regime diagram for geostrophic turbulence in the ocean is constructed by plotting observation‐based estimates of the non‐dimensional eddy length‐scale against a nonlinearity parameter equal to the ratio of the root‐mean‐square eddy velocity and baroclinic Rossby phase speed. Two estimates of the eddy length‐scale are compared: the equivalent eddy radius inferred from the area enclosed by contours of sea‐surface height, and the ‘unsuppressed’ mixing length, based on an estimate of the eddy diffusivity with mean flow effects removed. For weak nonlinearity, as found in the Tropics, the mixing length mostly corresponds to the stability threshold for baroclinic instability whereas the eddy radius corresponds to the Rhines scale; it is suggested that this mismatch is indicative of the inverse energy cascade that occurs at low latitudes in the ocean and the zonal elongation of eddies. At larger values of nonlinearity, as found at mid‐ and high latitudes, the eddy length‐scales are much shorter than the stability threshold, within a factor of 2.5 of the Rossby deformation radius.
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