A modeling study of the effect of drizzle on cloud optical depth and susceptibility
A modeling study of the effect of drizzle on cloud optical depth and susceptibility
复制标题
毛毛雨对云光深度和磁化率影响的模型研究
DOI：
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发表时间：
1997
期刊：
影响因子：
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通讯作者：
W. Cotton
中科院分区：
文献类型：
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作者：
G. Feingold;R. Boers;B. Stevens;W. Cotton
本文研究了由收集过程产生的水滴光谱展宽对海洋层积云的光学深度、云反照率和磁化率的影响。结果是使用（1）收集的简单盒模型计算的输出和（2）层积云涡旋解析模型的输出得出的，该模型明确地表示了液滴的尺寸分布。结果表明，针对窄光谱开发的云光学特性的常用关系通常不适用于经历光谱展宽的光谱。当光谱通过收集展宽时，光学深度对滴数浓度的三分之一次方的依赖性被证明是对光学深度的高估。此外，对于经历加宽的光谱，云磁化率对滴数的依赖性比窄光谱更大。
This paper examines the impact of drop spectral broadening, generated by the collection process, on the optical depth, cloud albedo, and susceptibility of marine stratocumulus clouds. The results are arrived at using (1) the output from a simple box model calculation of collection and (2) the output from an eddy-resolving model of stratocumulus clouds that explicitly represents the size distribution of the drops. It is shown that commonly used relationships for cloud optical properties developed for narrow spectra do not generally apply to spectra undergoing spectral broadening. The optical depth dependence on the drop number concentration to the one-third power is shown to be an overestimate of the optical depth when spectra broaden through collection. In addition, the cloud susceptibility dependence on drop number is shown to be larger for spectra experiencing broadening than for narrow spectra.