Spring diurnal cycle of clouds over Tibetan Plateau: Global cloud‐resolving simulations and satellite observations
Spring diurnal cycle of clouds over Tibetan Plateau: Global cloud‐resolving simulations and satellite observations
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DOI：
10.1029/2007gl030782
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发表时间：
2007-09
影响因子：
5.2
通讯作者：
Tomonori Sato;H. Miura;M. Satoh
中科院分区：
文献类型：
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作者：
Tomonori Sato;H. Miura;M. Satoh
青藏高原的热力强迫对亚洲夏季风有重要影响。在这项研究中，我们统计分析了全球云解析模型NICAM（非静力二十面体大气模型）的输出。为了研究对流活动，比较了两个亮温资料，一个来自卫星观测，另一个来自模式。该模式较好地模拟了2004年4月对流云的时空变化。云的日循环在NICAM中的表现比再分析资料更好，它只显示了几个小时的相位差。三个改变水平分辨率的试验表明，高分辨率的运行进行更好的代表性的日变化周期，特别是夜间消失的高云。这些结果表明，全球云分辨模式通过更好地描述青藏高原的热力强迫，将改善亚洲夏季风的季节预报。
Thermal forcing of the Tibetan Plateau (TP) has large impacts on the Asian summer monsoon. In this study, we statistically analyzed the outputs from the global cloud‐resolving model, NICAM (Nonhydrostatic ICosahedral Atmospheric Model). In order to investigate the convective activities, two brightness temperature datasets were compared, one derived from the satellite observation and another derived from the model. The model well simulated the spatio‐temporal variations of convective clouds in April 2004. The diurnal cycle of clouds was better represented in NICAM, which shows only few‐hour phase difference, than that in the reanalysis data. Three experiments changing horizontal resolution revealed that the higher resolution run conducts better representation of the diurnal cycle, especially on the nighttime disappearance of the high clouds. These results indicate that the global cloud‐resolving model will improve the seasonal prediction of the Asian summer monsoon through better description on the thermal forcing of the Tibetan Plateau.