Sensitivity of Radiative–Convective Equilibrium Simulations to Horizontal Resolution
Sensitivity of Radiative–Convective Equilibrium Simulations to Horizontal Resolution
复制标题
辐射对流平衡模拟对水平分辨率的敏感性
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
S. Garner
中科院分区：
文献类型：
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作者：
O. Pauluis;S. Garner
本文研究了水平分辨率对对流统计行为的影响。对模式分辨率为2~50公里的理想辐射对流平衡进行了数值模拟。基于对平均状态、能量和水汽输送的分析，以及对各种量的概率分布函数的分析，对模拟结果进行了比较。结果表明，在较低分辨率下，模式不能捕捉到与浅层云有关的混合。这导致了对流层下部的干燥偏向，并导致了过多的水云。尽管存在这一缺陷，但粗分辨率模拟能够较好地再现深对流塔的统计特性。这一点在表现出非常稳健行为的云冰和垂直速度分布中尤为明显。基于理想网格的行为，导出了垂直速度与网格分辨率的函数关系的理论标度。
Abstract This paper investigates the impacts of horizontal resolution on the statistical behavior of convection. An idealized radiative–convective equilibrium is simulated for model resolutions ranging between 2 and 50 km. The simulations are compared based upon the analysis of the mean state, the energy and water vapor transport, and the probability distribution functions for various quantities. It is shown that, at a coarse resolution, the model is unable to capture the mixing associated with shallow clouds. This results in a dry bias in the lower troposphere, and in an excessive amount of water clouds. Despite this deficiency, the coarse resolution simulations are able to reproduce reasonably well the statistical properties of deep convective towers. This is particularly apparent in the cloud ice and vertical velocity distributions that exhibit a very robust behavior. A theoretical scaling for the vertical velocity as function of the grid resolution is derived based upon the behavior of an idealized ai...