气候变化领域集成服务门户(CCPortal): Capability of Superspheroids for Modeling PARASOL Observations Under Dusty-Sky Conditions

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DOI	10.1029/2020JD033310
	Capability of Superspheroids for Modeling PARASOL Observations Under Dusty-Sky Conditions
	Lin W.; Bi L.; Weng F.; Li Z.; Dubovik O.
发表日期	2021
ISSN	2169897X
卷号	126 期号:1
英文摘要	A comprehensive dust-particle geometry model is highly required for accurate computations of optical parameters in radiative transfer simulations and relevant remote sensing applications. In this study, a superspheroidal model is proposed for simulating polarized radiation at the top of the atmosphere (TOA) under dusty-sky conditions. The superspheroidal model has one more degree of freedom than the spheroidal model. Sensitivity studies are first conducted to investigate how the additional freedom in the superspheroidal dust model affects the polarized signals at the TOA followed by an examination of the impact of particle size, complex refractive index, and surface properties on these polarized signals. The applicability of the superspheroidal model is then assessed for 11 selected dust events in three main dust source regions (namely, North Africa, Middle East, and the Taklamakan Desert). Specifically, the normalized polarized radiance as observed by the Polarization and Anisotropy of Reflectances for Atmospheric Sciences coupled with Observations from a Lidar (PARASOL) are compared with simulations from an adding-doubling vector radiative transfer model. It is found that the concave superspheroidal model with large roundness parameters achieves favorable performances in fitting the angular distribution of the PARASOL polarized radiance. The optimal roundness parameter is found to be 2.6–3.0 and is consistent with recent comparison of the simulated scattering matrices and their laboratory measurement counterparts. These findings support the potential applicability of the superspheroidal model for polarized remote sensing applications. © 2020. American Geophysical Union. All Rights Reserved.
英文关键词	dust aerosol; polarization; radiative transfer; scattering
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185556
作者单位	Key Laboratory of Geoscience Big Data and Deep Resource of Zhejiang Province, School of Earth Sciences, Zhejiang University, Hangzhou, China; Chinese Academy of Meteorological Sciences, Beijing, China; State Environmental Protection Key Laboratory of Satellite Remote Sensing, Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing, China; Laboratoire d'Optique Atmosphérique, CNRS/Université Lille, Villeneuve d'Ascq, France
推荐引用方式 GB/T 7714	Lin W.,Bi L.,Weng F.,et al. Capability of Superspheroids for Modeling PARASOL Observations Under Dusty-Sky Conditions[J],2021,126(1).
APA	Lin W.,Bi L.,Weng F.,Li Z.,&Dubovik O..(2021).Capability of Superspheroids for Modeling PARASOL Observations Under Dusty-Sky Conditions.Journal of Geophysical Research: Atmospheres,126(1).
MLA	Lin W.,et al."Capability of Superspheroids for Modeling PARASOL Observations Under Dusty-Sky Conditions".Journal of Geophysical Research: Atmospheres 126.1(2021).