Simulation of the Great Plains Low-Level Jet and Associated Clouds by General Circulation Models
Simulation of the Great Plains Low-Level Jet and Associated Clouds by General Circulation Models
复制标题
用大气环流模型模拟大平原低空急流和相关云
DOI：
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发表时间：
1996
期刊：
影响因子：
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通讯作者：
L. Corsetti
中科院分区：
文献类型：
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作者：
S. Ghan;X. Bian;L. Corsetti
在美国大平原地区经常观测到的低空急流优先在夜间形成，并明显影响该地区雷暴的时间。作者发现，欧洲中期天气预报中心的大气环流模式和美国国家大气研究中心的社区气候模式都能很好地模拟低空急流，尽管这两种模式模拟的急流频率的空间分布有很大差异。敏感性实验表明，模拟的低空急流是令人惊讶的强大，类似的模拟在更粗糙的水平和垂直分辨率。然而，这两个GCM未能模拟云和低空急流之间的关系。与低空急流相关的雷暴频率明显的夜间最大值没有很好地被任一GCM模拟，只有微弱的证据表明在大平原的夜间最大值。
Abstract The low-level jet frequently observed in the Great Plains of the United States forms preferentially at night and apparently influences the timing of thunderstorms in the region. The authors have found that both the European Centre for Medium-Range Weather Forecasts general circulation model and the National Center for Atmospheric Research Community Climate Model simulate the low-level jet rather well, although the spatial distribution of the jet frequency simulated by the two GCMs differs considerably. Sensitivity experiments have demonstrated that the simulated low-level jet is surprisingly robust, with similar simulations at much coarser horizontal and vertical resolutions. However, both GCMs fail to simulate the observed relationship between clouds and the low-level jet. The pronounced nocturnal maximum in thunderstorm frequency associated with the low-level jet is not simulated well by either GCM, with only weak evidence of a nocturnal maximum in the Great Plains.