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大气沙尘气溶胶的激光雷达比-退偏振比关系：超球体模型与高光谱分辨率激光雷达观测

Lidar Ratio-Depolarization Ratio Relations of Atmospheric Dust Aerosols: The Super-Spheroid Model and High Spectral Resolution Lidar Observations.

作者信息

Kong Senyi, Sato Kaori, Bi Lei

机构信息

Key Laboratory of Geoscience Big Data and Deep Resource of Zhejiang Province School of Earth Sciences Zhejiang University Hangzhou China.

Research Institute for Applied Mechanics Kyushu University Fukuoka Japan.

出版信息

J Geophys Res Atmos. 2022 Feb 27;127(4):e2021JD035629. doi: 10.1029/2021JD035629. Epub 2022 Feb 16.

DOI:10.1029/2021JD035629
PMID:35865334
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9285855/
Abstract

The backscattering optical properties of an ensemble of randomly oriented dust particles at a wavelength of 355 nm were comprehensively studied by examining the invariant imbedding T-matrix results of the super-spheroid dust model. In particular, we focused on the lidar ratio ( ) and depolarization ratio ( ) relations of dust aerosols to aid interpretation of data from the Atmospheric Lidar (ATLID) instrument that will be onboard the Earth Cloud, Aerosol and Radiation Explorer (EarthCARE) satellite. Super-spheroid models with various aspect ratios ( ), roundness parameters , and refractive indices were investigated over a wide range of particle sizes and compared to the observation data of the National Aeronautics and Space Administration (NASA) Langley 355-nm airborne high spectral resolution lidar. We found that super-spheroid dust particles with different sets of and could be used to model almost the entire range of the observed joint distributions of and . The relation could effectively discriminate among dust particle types. The observed and values with the largest population density were best covered by models with  > 2, especially by those with varying from 2.4 to 3.0.

摘要

通过研究超球体尘埃模型的不变嵌入T矩阵结果，全面研究了波长为355 nm时随机取向尘埃粒子集合的后向散射光学特性。特别是，我们重点关注尘埃气溶胶的激光雷达比（ ）和退偏振比（ ）关系，以帮助解释搭载在地球云、气溶胶和辐射探测器（EarthCARE）卫星上的大气激光雷达（ATLID）仪器的数据。研究了具有不同纵横比（ ）、圆度参数 和折射率的超球体模型在广泛粒径范围内的情况，并与美国国家航空航天局（NASA）兰利355 nm机载高光谱分辨率激光雷达的观测数据进行了比较。我们发现，具有不同 和 组合的超球体尘埃粒子可用于模拟观测到的 和 联合分布的几乎整个范围。 关系可以有效区分尘埃粒子类型。观测到的具有最大人口密度的 和 值最好由 > 2的模型覆盖，特别是那些 在2.4到3.0之间变化的模型。

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