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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >An assessment of the Geophysical Fluid Dynamics Laboratory ocean model with coarse resolution: Annual-mean climatology
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An assessment of the Geophysical Fluid Dynamics Laboratory ocean model with coarse resolution: Annual-mean climatology

机译：粗分辨率地球物理流体动力学实验室海洋模型评估：年平均气候

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摘要

The Geophysical Fluid Dynamics Laboratory Modular Ocean Model 2.2 code with coarse resolution (4 deg * 3 deg) is assessed by performing three experiments and comparing their equilibrated solutions with recent observationally based analyses (OBAs). The first experiment (E1) uses subgrid-scale horizontal diffusion and surface boundary conditions which relax surface temperature and salinity toward observations. The second (E2) replaces the physically incorrect heat and moisture flux boundary conditions of E1 by flux conditions taken from OBAs, plus a term relaxing surface temperatures toward observations. The third (E3) uses the same surface boundary conditions as E2 but replaces the horizontal diffusion by the Gent-McWilliams (GM) parameterization of isopycnal diffusion. Under the restoring surface boundary conditions (E1), the North Atlantic overturning rate is about 17 Sv, smaller than in OBAs, the maximum poleward heat transport in the Northern Hemisphere is 1.2 Petawatts (PW), also smaller than in OBAs, and in the Antarctic Circumpolar Current (ACC) region the poleward heat transport is 1.3 PW, much larger than in OBAs. Under the more realistic flux boundary condition (E2) the overturning rate increases to an unrealistically large level of 40 Sv, and the poleward heat transports are only slightly improved. When the GM parameterization is employed (E3), the overturning is reduced to 28 Sv, and the poleward heat transport in the ACC region is reduced to 0.3 PW; both results are consistent with OBAs. However, there is only a slight further improvement in the poleward heat transport in the Northern Hemisphere, which now has a peak value of 1.6 PW, still about 0.5 PW less than in OBAs. The sea surface temperature errors in E3 are consistent with the conclusion that the heat transport in the Northern Hemisphere is still being underestimated. All the experiments show strong systematic biases in the salinity field.
机译：通过执行三个实验并将其平衡解与最近的基于观测的分析（OBA）进行比较，可以评估具有粗分辨率（4 deg * 3 deg）的地球物理流体动力学实验室模块化海洋模型2.2代码。第一个实验（E1）使用亚网格规模的水平扩散和表面边界条件，从而放松了观测的表面温度和盐度。第二个（E2）用取自OBA的通量条件代替E1的物理上不正确的热量和湿气通量边界条件，再加上术语“松弛表面温度”以进行观测。第三个（E3）使用与E2相同的表面边界条件，但是用等渗扩散的Gent-McWilliams（GM）参数化代替了水平扩散。在恢复表面边界条件（E1）下，北大西洋的倾覆速率约为17 Sv，比OBA的要小，北半球的最大极向热传递为1.2皮瓦（PW），也比OBA的要小。南极极地电流（ACC）区域的极热传递为1.3 PW，比OBA中的大得多。在更实际的磁通边界条件（E2）下，倾覆速率增加到40 Sv的不切实际的大水平，而极向热传递仅略有改善。当使用GM参数化（E3）时，倾覆降低到28 Sv，ACC区域的极向热传递降低到0.3 PW。两种结果均与OBA一致。但是，北半球的极向热传输仅略微改善，现在的峰值为1.6 PW，仍比OBA少0.5 PW。 E3中的海面温度误差与北半球的热传输仍被低估的结论一致。所有实验均显示出盐度场上的强烈系统偏差。

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