The microstructure of hill cap clouds
The microstructure of hill cap clouds
复制标题
山冠云的微观结构
DOI：
10.1002/qj.49711247107
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发表时间：
1986
影响因子：
8.9
通讯作者：
T. Choularton
中科院分区：
文献类型：
--
作者：
D. Carruthers;T. Choularton
利用云微物理模式和气流模式研究了山顶云的微结构。云的寿命和云所经过的距离都被假定为足够小，因此冷凝本身被认为是重要的;液滴的聚结被忽略。改变（i）云底高度，（ii）云底以下的湿度波动和（iii）云内湍流的影响，进行了描述。发现过程（i）是重要的，它对云微结构的影响与云凝结核分布或平均风的变化的影响一样大。还讨论了云滴对地损失、云顶辐射冷却和干空气卷吸等过程对云滴分布的影响。
A cloud microphysical model and a model of airflow over hills are used to examine the microstructure of hill cap clouds. The lifetime of the clouds and the distance travelled by the clouds are both assumed to be sufficiently small so that condensation alone is considered to be important; the coalescence of drops is neglected. The effects of changing (i) the height of cloud base, (ii) humidity fluctuations below cloud base and (iii) incloud turbulence, are described. Process (i) is found to be important, its effect on the cloud microstructure being as great as the effect of changes in the CCN distribution or in the mean wind. Droplet loss to ground, radiative cooling at cloud top and entrainment of dry air are also discussed; these processes may all significantly affect the cloud droplet distribution.