Improved measurements of the drop size distribution of a freezing drizzle event
Improved measurements of the drop size distribution of a freezing drizzle event
复制标题
改进了冻毛毛雨事件的液滴尺寸分布的测量
DOI：
10.1016/s0169-8095(98)00062-3
复制
发表时间：
1998
影响因子：
5.5
通讯作者：
G. Isaac
中科院分区：
文献类型：
--
作者：
R. Lawson;A. Korolev;S. Cober;T. Huang;J. Strapp;G. Isaac
在加拿大冻雨实验中，将新型数字全息相机的机载测量结果与PMS 2D-C测量结果进行了比较。与2D-C探头不同，数字全息相机不会受到与失焦颗粒相关的液滴尺寸误差的影响。本文讨论了近年来二维三维粒子尺寸误差的理论模拟和统计校正方法。理论模拟预测，在液滴直径约为50-200 μm的冰点细雨中，未经校正的PMS 2D-C测量结果会在液滴尺寸分布中产生一条延伸至约325 μm的人工尾巴。数码全息相机看不到人造尾巴。冰冻细雨中水滴尺寸分布的2D-C测量结果经统计校正后，与数字全息测量结果的一致性得到了改善。图中还展示了由该仪器最近改进的云粒子成像仪（CPI）拍摄的毛毛雨和冰晶的数字图像。
Airborne measurements from a new digital holographic camera are compared with PMS 2D-C measurements during the Canadian Freezing Drizzle Experiment. The digital holographic camera is not affected by drop sizing errors associated with out of focus particles in the same way as the 2D-C probe. Recent theoretical simulations of 2D-C particle sizing errors and approaches for statistically correcting the measurements are discussed. The theoretical simulations predict that in freezing drizzle with drop diameters from about 50–200 μm, uncorrected PMS 2D-C measurements can produce an artificial tail in the drop size distribution that extends out to about 325 μm. The digital holographic camera does not see the artificial tail. 2D-C measurements of drop size distribution in freezing drizzle that have been statistically corrected show an improved agreement with the digital holographic measurements. Some digital images of drizzle drops and ice crystals from a recently improved version of the instrument, called a cloud particle imager (CPI), are also shown.