Three-dimensional simulation of cloud street development during a cold air outbreak
Three-dimensional simulation of cloud street development during a cold air outbreak
复制标题
冷空气爆发期间云街发展三维模拟
DOI：
10.1007/bf00120757
复制
发表时间：
1992
影响因子：
4.3
通讯作者：
A. Chlond
中科院分区：
文献类型：
--
作者：
A. Chlond
采用三维数值模型研究了一次冷空气爆发过程中的边界层涡动结构。该模型明确表示大尺度的三维运动，而小尺度湍流是参数化的；它包含有云形成的水循环，并考虑了多云条件下的红外辐射冷却和大尺度垂直运动的影响。该模式适用于ARKTIS 1988试验期间在格陵兰海上空观测到的云街/层积云发展的相应条件。当冷空气从冰上流过相对温暖的海水时，边界层会迅速增长。在边界层中发现了相干结构。研究发现，随着离冰缘的距离增加，冰卷的对流性质越来越强。给出了流场的定性和定量描述。此外，还指出了各种物理过程和外部参数在变量平均场演化中的相对重要性。
A three-dimensional numerical model is used to study boundary-layer eddy structure during a cold air outbreak. The model explicitly represents the large-scale three-dimensional motions, while small-scale turbulence is parameterized; it contains a water cycle with cloud formation and it takes into account infrared radiative cooling in cloudy conditions and the influence of large-scale vertical motions.The model is applied to conditions corresponding to an observed case of cloud street/stratocumulus development which occurred over the Greenland Sea during the ARKTIS 1988 experiment. The boundary layer is found to grow rapidly as the cold air flows off the ice over the relatively warm water. Coherent structures were identified in this boundary layer. It is found that the rolls become increasingly more convective in character with distance from the ice edge. Qualitative and quantitative descriptions of the flow field are given. Additionally, the relative importance of the various physical processes and external parameters in the evolution of the mean field of variables is indicated.