Publication Abstracts

Yang et al. 2003

Yang, P., Y.X. Hu, D.M. Winker, J. Zhao, C.A. Hostetler, L. Poole, B.A. Baum, M.I. Mishchenko, and J. Reichardt, 2003: Enhanced lidar backscattering by quasi-horizontally oriented ice crystal plates in cirrus clouds. J. Quant. Spectrosc. Radiat. Transfer, 79-80, 1139-1157, doi:10.1016/S0022-4073(02)00346-1.

The backscattering of light by quasi-horizontally oriented hexagonal ice plates is investigated because of its pertinence to lidar measurements of cirrus clouds. For oriented ice crystals, the commonly used geometric optics ray-tracing method is not applicable to the computation of the scattered field in certain scattering directions, in particular, the backscattering direction, because of the singularity problem inherent to the ray-tracing technique. In this study, we solve for the electric field due to scattering by quasi-horizontally oriented ice plates using an approach based on the electromagnetic wave theory. We simplify the analysis by ignoring the eAect of the plate's side faces on the internal field inside the particle. This is a reasonable approximation when the ratio of the particle diameter to its thickness is large. This approximation is also valid if the tilt of the particle's symmetric axis from zenith is small and the size parameter is large. The present numerical results indicate that very strong oscillations in the backscattering cross section occur with the variation of size parameter. Furthermore, the bulk backscattering intensity has been calculated by including the eAect of a particle size distribution and the random tilt of particle symmetric axis within a small angular region, for example, 2°. A strong dependence is found between the lidar backscattering cross section and the degree of the random tilt of the particles. A combination of the present method with the T-matrix method, which works well for particles having small and moderate size parameters, may provide a more complete picture of the lidar backscattering by quasi-horizontally oriented ice plate.

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BibTeX Citation

@article{ya06000k,
  author={Yang, P. and Hu, Y. X. and Winker, D. M. and Zhao, J. and Hostetler, C. A. and Poole, L. and Baum, B. A. and Mishchenko, M. I. and Reichardt, J.},
  title={Enhanced lidar backscattering by quasi-horizontally oriented ice crystal plates in cirrus clouds},
  year={2003},
  journal={J. Quant. Spectrosc. Radiat. Transfer},
  volume={79-80},
  pages={1139--1157},
  doi={10.1016/S0022-4073(02)00346-1},
}

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RIS Citation

TY  - JOUR
ID  - ya06000k
AU  - Yang, P.
AU  - Hu, Y. X.
AU  - Winker, D. M.
AU  - Zhao, J.
AU  - Hostetler, C. A.
AU  - Poole, L.
AU  - Baum, B. A.
AU  - Mishchenko, M. I.
AU  - Reichardt, J.
PY  - 2003
TI  - Enhanced lidar backscattering by quasi-horizontally oriented ice crystal plates in cirrus clouds
JA  - J. Quant. Spectrosc. Radiat. Transfer
VL  - 79-80
SP  - 1139
EP  - 1157
DO  - 10.1016/S0022-4073(02)00346-1
ER  -

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