Catastrophe-Concept-Based Cumulus Parameterization: Correction of Systematic Errors in the Precipitation Diurnal Cycle over Land in a GCM
Catastrophe-Concept-Based Cumulus Parameterization: Correction of Systematic Errors in the Precipitation Diurnal Cycle over Land in a GCM
复制标题
基于突变概念的积云参数化：GCM 中陆地降水日循环系统误差的校正
DOI：
--
复制
发表时间：
2013
期刊：
影响因子：
--
通讯作者：
W. Chao
中科院分区：
文献类型：
--
作者：
W. Chao
摘要 网格柱中积云对流的发生是一场灾难，也称为亚临界不稳定。因此，在设计积云参数化方案时，积云对流的开始要求参数跨越临界值，而积云对流的终止要求相同或不同的参数跨越不同的临界值。一旦开始，积云对流将继续存在，无论是否仍然满足起始准则，直到满足终止准则。此外，积云降水的强度与状态距终止标准的距离有关，而不是与开始标准有关。然而，目前在 GCM 中使用的积云参数化方案将积云对流的开始视为超临界不稳定；即，当参数超过临界值时对流打开，当相同参数低于相同临界值时对流关闭。此外，积云降水的强度与距离有多远有关......
AbstractThe onset of cumulus convection in a grid column is a catastrophe, also known as a subcritical instability. Accordingly, in designing a cumulus parameterization scheme the onset of cumulus convection requires that a parameter crosses a critical value and the termination of cumulus convection requires that the same or a different parameter crosses a different critical value. Once begun, cumulus convection continues to exist, regardless of whether the onset criterion is still met, until the termination criterion is met. Also, the intensity of cumulus precipitation is related to how far the state is from the termination, not the onset, criterion.The cumulus parameterization schemes currently in use in GCMs, however, treat the onset of cumulus convection as a supercritical instability; namely, convection is turned on when a parameter exceeds a critical value and is turned off when the same parameter falls below the same critical value. Also, the intensity of cumulus precipitation is related to how far...