Assessment of turbulence closure models for resonant inertial response in the oceanic mixed layer using a large eddy simulation model
Assessment of turbulence closure models for resonant inertial response in the oceanic mixed layer using a large eddy simulation model
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DOI：
10.1007/s10872-011-0095-3
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发表时间：
2012-04-01
影响因子：
2.3
通讯作者：
Niwa, Yoshihiro
中科院分区：
文献类型：
--
作者：
Furuichi, Naoki;Hibiya, Toshiyuki;Niwa, Yoshihiro
对上层海洋对强风强迫的共振惯性响应进行了大涡模拟（LES）;结果用于评估梅洛尔和山田（Rev Geophys Space Phys 20：851-875，1982）（MY）以及Nakanishi和Niino（J Meteorol Soc Jpn 87：895-912，2009）（NN）提出的两种二阶湍流闭合模型的性能。MY和NN之间的主要区别是在制定的稳定性功能和湍流长度尺度，都与湍流通量密切相关，特别是，在NN中的湍流长度尺度，不像在MY中，被允许随着密度分层的增加而减少。我们发现，MY低估和NN高估的混合层功能的发展，例如，在海洋混合层的基础上的强卷吸和伴随的海表温度的降低。考虑到NN中的稳定性函数在再现湍流热通量的垂直结构方面比MY中的稳定性函数表现得更好，我们稍微修改了NN，发现随着密度分层的增加，更强烈地限制湍流长度尺度可以减少LES和NN之间的差异。
Large eddy simulation (LES) of the resonant inertial response of the upper ocean to strong wind forcing is carried out; the results are used to evaluate the performance of each of the two second-order turbulence closure models presented by Mellor and Yamada (Rev Geophys Space Phys 20:851-875, 1982) (MY) and by Nakanishi and Niino (J Meteorol Soc Jpn 87:895-912, 2009) (NN). The major difference between MY and NN is in the formulation of the stability functions and the turbulent length scale, both strongly linked with turbulent fluxes; in particular, the turbulent length scale in NN, unlike that in MY, is allowed to decrease with increasing density stratification. We find that MY underestimates and NN overestimates the development of mixed layer features, for example, the strong entrainment at the base of the oceanic mixed layer and the accompanying decrease of sea surface temperature. Considering that the stability functions in NN perform better than those in MY in reproducing the vertical structure of turbulent heat flux, we slightly modify NN to find that the discrepancy between LES and NN can be reduced by more strongly restricting the turbulent length scale with increasing density stratification.