Supercooled Water Cloud Detection From Polarized Multi-Angle Imager Data Using 1.37 μm Water Vapor Polarized Channel

IF 3.8 2区 地球科学 Q2 METEOROLOGY & ATMOSPHERIC SCIENCES
Haofei Wang, Na Xu, Bertrand Fougnie, Peng Zhang, Bojan Bojkov, Songyan Gu, Jian Shang, Lin Chen, Xiuqing Hu, Zhengqiang Li
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Abstract

Detecting supercooled water clouds (SWCs) is essential for enhancing artificial rainfall, preventing aircraft ice accretion, and developing a better understanding of radiative energy balance. The 1.37 μm channel, known as strong water vapor absorbing, was made polarized in the polarized multi-angle imager (PMAI) onboard FengYun-3G satellite. The infight data shown that the new 1.37 μm polarized channel could be used to detect SWCs. The cloudbow is observed around the 140° scattering angle in the 1.37 μm polarization image, with a maximum polarization reflectance of approximately 0.04–0.06. The indicated water clouds with spherical particles in the high-level altitude could be SWCs. Then, the SWCs detected by 1.37 μm polarized channel is verified using polarized reflectance of other channels, the reflectance difference of channels, and thermal infrared bright temperature. The presence of cloudbow in 1.03 and 1.64 μm channels indicate liquid water cloud. The reflectance difference between 1.03 and 1.64 μm of SWCs agree with characteristic of water cloud. The thermal infrared channels from the imager on the same platform indicate cold cloud with the brightness temperature far below 273.16 K. Therefore, the only use of 1.37 μm polarized channel could perform the identification of SWCs. PMAI provides a powerful tool for monitoring supercooled water clouds.

利用 1.37 μm 水汽偏振通道从偏振多角度成像仪数据中探测过冷水云
探测过冷水云(SWCs)对于增强人工降雨、防止飞机积冰以及更好地了解辐射能量平衡至关重要。风云三号 G 卫星搭载的偏振多角度成像仪(PMAI)对 1.37 μm 波道进行了偏振处理,该波道被称为强水汽吸收波道。这次飞行的数据表明,新的 1.37 μm 偏振信道可用于探测 SWCs。在 1.37 μm 偏振图像中,140°散射角附近观测到云弓,最大偏振反射率约为 0.04-0.06。在高空观测到的带有球形颗粒的水云可能就是 SWC。然后,利用其他信道的偏振反射率、信道反射率差和热红外亮温对 1.37 μm 偏振信道探测到的 SWC 进行验证。1.03 和 1.64 μm 信道中云弓的存在表明存在液态水云。水云母 1.03 和 1.64 μm 之间的反射率差符合水云的特征。因此,仅使用 1.37 μm 偏振信道就可以识别水云。PMAI 为监测过冷水云提供了强有力的工具。
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来源期刊
Journal of Geophysical Research: Atmospheres
Journal of Geophysical Research: Atmospheres Earth and Planetary Sciences-Geophysics
CiteScore
7.30
自引率
11.40%
发文量
684
期刊介绍: JGR: Atmospheres publishes articles that advance and improve understanding of atmospheric properties and processes, including the interaction of the atmosphere with other components of the Earth system.
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