Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5428298 | Journal of Quantitative Spectroscopy and Radiative Transfer | 2014 | 8 Pages |
â¢T-matrix method reveals effects of cloud droplet nonsphericity on Lorenz-Mie resonances.â¢Positions and profiles of resonances can change significantly with increasing asphericity.â¢Degree of asphericity required to suppress a resonance is proportional to the resonance width.
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.