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Vertical resolution dependence of gravity wave momentum flux simulated by an atmospheric general circulation model

机译：大气总环流模型模拟的重力波动量通量的垂直分辨率依赖性

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The dependence of the gravity wave spectra of energy and momentum flux onthe horizontal resolution and time step of atmospheric general circulationmodels (AGCMs) has been thoroughly investigated in the past. In contrast,much less attention has been given to the dependence of these gravity waveparameters on models' vertical resolutions. The present study demonstratesthe dependence of gravity wave momentum flux (GWMF) in the stratosphere andmesosphere on the model's vertical resolution, which is evaluated using anAGCM with a horizontal resolution of about 0.56°. We performed aseries of sensitivity test simulations changing only the model's verticalresolution above a height of 8 km, and found a global reduction of GWMF withincreasing vertical resolution. Inertial gravity waves with short verticalwavelengths simulated at higher vertical resolutions might play an importantrole in determining GWMF in the summertime stratosphere. The sensitivitytest simulation also demonstrated the importance of the model's verticalresolution on representing realistic behaviors of gravity waves near theircritical level.
机译：过去已经深入研究了能量和动量通量的重力波谱对大气总循环模型（AGCM）的水平分辨率和时间步长的依赖性。相反，这些重力波参数对模型垂直分辨率的依赖性却很少受到关注。本研究证明了平流层和中空层重力波动量通量（GWMF）对模型垂直分辨率的依赖性，该水平分辨率是使用水平分辨率约为0.56°的aAGCM进行评估的。我们进行了一系列灵敏度测试模拟，仅改变了模型在8 km以上的高度的垂直分辨率，并发现在垂直分辨率提高的范围内，GWMF的整体降低。在较高的垂直分辨率下模拟的垂直波长短的惯性重力波可能在确定夏季平流层的GWMF中起重要作用。灵敏度测试模拟还证明了模型的垂直分辨率对于表示重力波接近临界水平的现实行为的重要性。

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