Small Cloud Particle Shapes in Mixed-Phase Clouds
Small Cloud Particle Shapes in Mixed-Phase Clouds
复制标题
混合相云中的小云颗粒形状
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
R. Jackson
中科院分区：
文献类型：
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作者：
G. McFarquhar;J. Um;R. Jackson
利用云粒子成像仪在北极混合相云实验(M-PACE)和间接和半直接气溶胶运动(ISDAC)过程中收集的高分辨率粒子图像，研究了混合相云中最大尺度Dmax在35~60μm之间的云粒子的形状。面积比α，粒子的投影面积除以直径为dmax的圆的面积，量化粒子形状。在M-PACE和ISDAC中使用的α的不同光学特性对导出的μ没有影响，前提是Dmax&>35 CPI；m和CPI Focus&>45。随着液体水含量(LWC)与总水含量(TWC)之比的增加，颗粒含量为350.8的颗粒所占比例增加。在混合相云中，每10个S间隔的小粒子α平均值与LWC/TWC值相关，相关系数分别为0.60和0.43。在M-PACE过程中看到的较强的相关性很可能与存在更多的液体有关。
AbstractThe shapes of cloud particles with maximum dimensions Dmax between 35 and 60 μm in mixed-phase clouds were studied using high-resolution particle images collected by a cloud particle imager (CPI) during the Mixed-Phase Arctic Cloud Experiment (M-PACE) and the Indirect and Semi-Direct Aerosol Campaign (ISDAC). The area ratio α, the projected area of a particle divided by the area of a circle with diameter Dmax, quantified particle shape. The differing optical characteristics of CPIs used in M-PACE and ISDAC had no effect on derived α provided that Dmax > 35 μm and CPI focus > 45. The fraction of particles with 35 0.8 increased with the ratio of liquid water content (LWC) to total water content (TWC). The average αmean of small particles in each 10-s interval in mixed-phase clouds was correlated with LWC/TWC with a correlation coefficient of 0.60 for M-PACE and 0.43 for ISDAC. The stronger correlation seen during M-PACE was most likely associated with the presence of more liq...