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Effects of nonsphericity on the behavior of Lorenz–Mie resonances in...

Dlugach, J. M., and M. Mishchenko (2014), Effects of nonsphericity on the behavior of Lorenz–Mie resonances in scattering characteristics of liquid-cloud droplets, J. Quant. Spectrosc. Radiat. Transfer, 146, 227-234, doi:10.1016/j.jqsrt.2014.01.004.

By using the results of highly accurate T-matrix computations for randomly oriented oblate and prolate spheroids and Chebyshev particles with varying degrees of asphericity, we analyze the effects of a deviation of water-droplet shapes from that of a perfect sphere on the behavior of Lorenz–Mie morphology-dependent resonances of various widths. We demonstrate that the positions and profiles of the resonances can change significantly with increasing asphericity. The absolute degree of asphericity required to suppress a Lorenz–Mie resonance is approximately proportional to the resonance width. Our results imply that numerical averaging of scattering characteristics of real cloud droplets over sizes may rely on a significantly coarser size-parameter resolution than that required for ideal, perfectly spherical particles.

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Radiation Science Program (RSP)