Lidar Ratio-Depolarization Ratio Relations of Atmospheric Dust Aerosols : The Super-Spheroid Model and High Spectral Resolution Lidar Observations
© 2022 The Authors.
| Publié dans: | Journal of geophysical research. Atmospheres : JGR. - 1998. - 127(2022), 4 vom: 27. Feb., Seite e2021JD035629 |
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| Auteur principal: | |
| Autres auteurs: | , |
| Format: | Article en ligne |
| Langue: | English |
| Publié: |
2022
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| Accès à la collection: | Journal of geophysical research. Atmospheres : JGR |
| Sujets: | Journal Article HSRL backscattering optical properties dust lidar ratio‐depolarization ratio relation nonsphericity/irregularity spaceborne lidar |
| Résumé: | © 2022 The Authors. 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 ( S ) and depolarization ratio ( δ ) 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 ( α ), roundness parameters ( n ) , 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 n and α could be used to model almost the entire range of the observed joint distributions of S and δ . The S - δ relation could effectively discriminate among dust particle types. The observed S and δ values with the largest population density were best covered by models with n > 2, especially by those with n varying from 2.4 to 3.0 |
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| Description: | Date Revised 31.07.2022 published: Print-Electronic Citation Status PubMed-not-MEDLINE |
| ISSN: | 2169-897X |
| DOI: | 10.1029/2021JD035629 |