Journal
APPLIED OPTICS
Volume 55, Issue 35, Pages 9968-9973Publisher
Optica Publishing Group
DOI: 10.1364/AO.55.009968
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Funding
- National Aeronautics and Space Administration (NASA) ACE Project
- National Academy of Sciences of Ukraine Main Astronomical Observatory GRAPE/GPU/GRID Computing Cluster Project
- NASA Remote Sensing Theory Program
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We use the numerically exact (superposition) T-matrix method to analyze recent measurements of the backscattering linear depolarization ratio (LDR) for a plume of aged smoke at lidar wavelengths ranging from 355 to 1064 nm. We show that the unique spectral dependence of the measured LDRs can be modeled, but only by assuming expressly nonspherical morphologies of smoke particles containing substantial amounts of nonabsorbing (or weakly absorbing) refractory materials such as sulfates. Our results demonstrate that spectral backscattering LDR measurements can be indicative of the presence of morphologically complex smoke particles, but additional (e.g., passive polarimetric or bistatic lidar) measurements may be required for a definitive characterization of the particle morphology and composition. (C) 2016 Optical Society of America
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