Publication Abstracts

Liu and Mishchenko 2001

Liu, L., and M.I. Mishchenko, 2001: Constraints on PSC particle microphysics derived from lidar observations. J. Quant. Spectrosc. Radiat. Transfer, 70, 817-831, doi:10.1016/S0022-4073(01)00048-6.

Based on extensive T-matrix computations of light scattering by polydispersions of randomly oriented, rotationally symmetric nonspherical particles, we analyze existing lidar observations of polar stratospheric clouds (PSCs) and derive several constraints on PSC particle microphysical properties. We show that sharp-edged nonspherical particles (finite circular cylinders) exhibit less variability of lidar backscattering characteristics with particle size and aspect ratio than particles with smooth surfaces (spheroids). For PSC particles significantly smaller than the the wavelength, the backscatter color index α and the depolarization color index β are essentially shape independent. Observations for type Ia PSCs can be reproduced by spheroids with aspect ratios larger than 1.2, oblate cylinders with diameter-to-length ratios greater than 1.6, and prolate cylinders with length-to-diameter ratios greater than 1.4. The effective equal-volume-sphere radius for type Ia PSCs is about 0.8 µm or larger. Type Ib PSCs are likely to be composed of spheres or nearly spherical particles with effective radii smaller than 0.8 µm. Observations for type II PSCs are consistent with large ice crystals (effective radius greater than 1 µm) modeled as cylinders or prolate spheroids.

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BibTeX Citation

  author={Liu, L. and Mishchenko, M. I.},
  title={Constraints on PSC particle microphysics derived from lidar observations},
  journal={J. Quant. Spectrosc. Radiat. Transfer},

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RIS Citation

ID  - li04000r
AU  - Liu, L.
AU  - Mishchenko, M. I.
PY  - 2001
TI  - Constraints on PSC particle microphysics derived from lidar observations
JA  - J. Quant. Spectrosc. Radiat. Transfer
VL  - 70
SP  - 817
EP  - 831
DO  - 10.1016/S0022-4073(01)00048-6
ER  -

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