PHIPS-HALO: the airborne Particle Habit Imaging and Polar Scattering probe – Part 3: Single-particle phase discrimination and particle size distribution based on the angular-scattering function
PHIPS-HALO: the airborne Particle Habit Imaging and Polar Scattering probe – Part 3: Single-particle phase discrimination and particle size distribution based on the angular-scattering function
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DOI：
10.5194/amt-14-3049-2021
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发表时间：
2021-04
影响因子：
3.8
通讯作者：
Fritz Waitz;M. Schnaiter;T. Leisner;E. Järvinen
中科院分区：
文献类型：
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作者：
Fritz Waitz;M. Schnaiter;T. Leisner;E. Järvinen
抽象的。在混合相云中进行原位观测的一个主要挑战仍然是云水凝物的相位鉴别和尺寸确定。在这项工作中，我们提出了一种新的方法来确定的相位的基础上，他们的角光散射行为的PHIPS（粒子的习惯成像和极性散射）机载云探测器的个别云水凝物。相位鉴别算法是基于球形和非球形粒子的角散射函数中的不同特征的差异。该算法的校准和评估使用的大型数据集收集在两个原位飞机运动在北极和南大洋。该算法与手动分类颗粒的比较表明，我们可以自信地区分球形和非球形颗粒，准确率为98%。此外，我们提出了一种方法来推导颗粒尺寸分布的基础上的单粒子角散射数据的颗粒尺寸范围从100 µm ≤ D ≤ 700 µm和20 µm ≤ D ≤ 700 µm的液滴和冰粒，分别。这些方法的功能证明在三个代表性的案例研究。
Abstract. A major challenge for in situ observations in mixed-phase clouds remains the phase discrimination and sizing of cloud hydrometeors. In this work, we present a new method for determining the phase of individual cloud hydrometeors based on their angular-light-scattering behavior employed by the PHIPS (Particle Habit Imaging and Polar Scattering) airborne cloud probe. The phase discrimination algorithm is based on the difference of distinct features in the angular-scattering function of spherical and aspherical particles. The algorithm is calibrated and evaluated using a large data set gathered during two in situ aircraft campaigns in the Arctic and Southern Ocean. Comparison of the algorithm with manually classified particles showed that we can confidently discriminate between spherical and aspherical particles with a 98 % accuracy. Furthermore, we present a method for deriving particle size distributions based on single-particle angular-scattering data for particles in a size range from 100 µm ≤ D ≤ 700 µm and 20 µm ≤ D ≤ 700 µm for droplets and ice particles, respectively. The functionality of these methods is demonstrated in three representative case studies.