Vertical heat and salt fluxes due to resolved and parameterized meso-scale Eddies
Vertical heat and salt fluxes due to resolved and parameterized meso-scale Eddies
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由于解析和参数化的中尺度涡流而产生的垂直热通量和盐通量
DOI：
10.1016/j.ocemod.2016.10.001
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发表时间：
2016
期刊：
影响因子：
3.2
通讯作者：
Fast I
中科院分区：
文献类型：
--
作者：
von Storch J-S;Haak H;Hertwig E;Fast I
使用一套模拟与马克斯普朗克研究所海洋模式（MPIOM）的分辨率约为0.1°，0.4°和1.5°，我们研究的影响，解决和参数化的垂直涡通量的长期存在的偏差时，运行MPIOM在低分辨率。在0.1°模拟中，涡动热通量和盐通量具有三个共同特征。首先，它们的水平面积平均值都是向上的，抵消了时间平均环流造成的向下通量。其次，他们的分歧在中间深度都是负面的，起到冷却和淡水质量，从而减少了主要的长期存在的温暖和盐水的偏见，低分辨率MPIOM在这些深度。第三，热量和盐的收支都是由涡动通量和平均通量的散度之间的平衡所决定的。由于参数化涡的趋势强迫的垂直廓线类似于那些由于解决涡。这种相似性并不能保证偏差的减小，因为趋势强迫项在0.4°和1.5°模拟中的补偿比在0.1°模拟中的补偿差得多。当集中于涡诱导输运时，我们确定了两种情况，在这两种情况下，GM参数化不能适当地表示涡效应。一个强调的重要性，平均示踪剂分布和其他的重要性，模拟的等中性斜率在确定涡诱导运输。鉴于南大洋的平均盐度分布，其特点是由新鲜的南极中层水的舌头，通过涡诱导运输的盐度平流往往会加强，而不是削弱，盐偏置。由于密度偏差在一个加宽的区域中的Agulhas电流在低分辨率运行，等中性斜率矢量是错误的，大参数化涡诱导运输没有发生在他们应该。
Using a suite of simulations with the Max Planck Institute Ocean Model (MPIOM) at resolutions of about 0.1°, 0.4° and 1.5°, we study the impact of resolved and parameterized vertical eddy fluxes on the long-standing biases obtained when running MPIOM at low resolutions. In the 0.1° simulation, the eddy heat and salt fluxes have three features in common. First, their horizontal area averages are both upward, counteracting the downward fluxes due to time-mean circulations. Second, their divergences at intermediate depths are both negative, acting to cool and to freshen water masses, thereby reducing the major long-standing warm and saline biases of the low-resolution MPIOM at these depths. Third, both the heat and salt budgets are dominated by a balance between the divergence of eddy flux and that of mean flux. The vertical profiles of the tendency forcing due to parameterized eddies resemble those due to resolved eddies. This resemblance does not guarantee a bias reduction, as the tendency forcing terms are much less well compensated in the 0.4°- and 1.5°-simulation than in the 0.1°-simulation.When concentrating on the eddy-induced transports, we identify two situations in which the eddy effect is not appropriately represented by the GM-parameterization. One emphasizes the importance of the mean tracer distribution and the other the importance of the simulated isoneutral slope in determining the eddy-induced transports. Given the mean salinity distribution in the Southern ocean, characterized by a tongue of fresh Antarctic Intermediate Water, the salinity advection via eddy-induced transport tends to strengthen, rather than to weaken, the saline biases. Due to the density biases in a widened region of the Agulhas current in the low-resolution runs, the isoneutral slope vectors are erroneous and the large parameterized eddy-induced transports do not occur where they should.
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