The Cloud Particle Spectrometer with Polarization Detection (CPSPD): A next generation open-path cloud probe for distinguishing liquid cloud droplets from ice crystals
The Cloud Particle Spectrometer with Polarization Detection (CPSPD): A next generation open-path cloud probe for distinguishing liquid cloud droplets from ice crystals
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DOI：
10.1016/j.atmosres.2013.12.010
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发表时间：
2014-06-01
影响因子：
5.5
通讯作者：
Vochezer, Paul
中科院分区：
文献类型：
--
作者：
Baumgardner, Darrel;Newton, Roy;Vochezer, Paul
通过现场测量区分小于50微米的小水滴和冰晶仍然是一个挑战，缺乏这种测量是在了解云中冰形成方面取得进展的障碍。一种新的微物理仪器-带有偏振检测的云粒子光谱仪（CPSPD）已经研制出来，它可以测量通过聚焦激光束的单个云粒子散射（向前和向后）的光强度，并得出它们在2至50 μ m光学直径范围内的大小和热力学相态（液体或冰）。光学等效直径是从向前方向散射的光导出的。由与云粒子的相互作用引起的入射光的偏振状态的变化由后向散射光的偏振分量确定。CPSPD和其他几个云微物理探测器沿着，已经在北达科他州他大学的飞机上在混合相云中飞行。它还被部署在楚格峰研究站，研究山脉云。初步结果表明，可以区分液态云滴从冰晶和冰分数可以估计，一个重要的参数，更好地了解云的过程，特别是冰川作用。(C)2013作者Elsevier B. V.出版，保留所有权利。
The differentiation of small water droplets and ice crystals by in situ measurements, in the size range < 50 mu m, remains a challenge and the lack of such measurements is an obstacle to progress in understanding ice formation in clouds. A new microphysical instrument, the Cloud Particle Spectrometer with Polarization Detection (CPSPD), has been developed that measures light intensity scattered (in forward and backward directions) by individual cloud particles that pass through a focused laser beam and derives their size and thermodynamic phase (liquid or ice) in the optical diameter range from 2 to 50 mu m. The optical equivalent diameter is derived from the light scattered in the forward direction. The change in polarization state of the incident light, caused by interaction with the cloud particle, is determined from the polarized components of the backscattered light. The CPSPD, along with several other cloud microphysical probes, has been flown on the University of North Dakota Citation aircraft in mixed phase clouds. It has also been deployed and operated at the Zugspitze research station studying mountain clouds. The preliminary results show that liquid cloud droplets can be distinguished from ice crystals and that the ice fraction can be estimated; an important parameter for better understanding of cloud processes, particularly that of glaciation. (C) 2013 The Authors. Published by Elsevier B.V. All rights reserved.