Online isolation of near-inertial internal waves in ocean general circulation models

Online isolation of near-inertial internal waves in ocean general circulation models
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海洋环流模型中近惯性内波的在线隔离

DOI:
10.1016/j.ocemod.2018.12.004
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发表时间:
2019-02
期刊:
影响因子:
3.2
通讯作者:
Lixin Wu
Lixin Wu
中科院分区:
地球科学3区
文献类型:
--
作者:
Zhuo Song;Zhao Jing;Lixin Wu

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近惯性内波在提供海洋底辟混合中起着重要作用。然而,在高分辨率海洋环流模式(OGCMs)的NIW引起的混合参数化仍然是一个具有挑战性的问题,部分原因是由于缺乏适当的工具,隔离NIWs在模式集成。在这项研究中,我们提出了两种新的方法可行的在线分离NIW在高分辨率OGCM,即,两步滤波和三步滤波,两步滤波只要求在两个时间步存储速度记录。当时间步长为6h时,该方法对30°极向近红外线的分离效果较好。通过利用在一个额外的时间步长的速度信息,与6小时的时间步长的三步滤波器一般优于两步滤波器在全球海洋。具体而言,三步滤波器导致NIW向15°极方向的合理隔离,其中NIW诱导的混合最强。
Near-inertial internal waves (NIWs) play an important role in furnishing ocean diapycnal mixing. However, parameterization of NIW-induced mixing in high-resolution ocean general circulation models (OGCMs) remains a challenging problem partially due to the lack of appropriate tools for isolating NIWs during the model integration. In this study, we propose two new methods feasible for online isolation of NIWs in high-resolution OGCMs, i.e., the two-step filter and three-step filter.The two-step filter only requires the velocity records to be stored at two time steps. It performs reasonably well in isolating NIWs poleward of 30° if the time step is set as 6 h. By utilizing the velocity information at one additional time step, the three-step filter with a time step of 6 h generally outperforms the two-step filter in the global ocean. Specifically, the three-step filter results in reasonable isolation of NIWs poleward of 15° where the NIW-induced mixing is strongest.
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