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王振会, Xiaoyonga, *, Zheng Guoguangb, Wang Zhenhuia, Wang Qing-anc
Journal of Quantitative Spectroscopy&Radiative Transfer 92(2005)61-72,-0001,():
-1年11月30日
This paper experimentally and theoretically examines the scattering properties of simulated non-spherical hydrometeors including water oblates, ice oblates and ice sphere-cone-oblates,in terms of the backscattering cross-section and the differential reflectivity.The experimental measurements of the backscattering cross-sections of non-spherical hydrometeor samples were performed in the Electromagnetic Scattering Laboratory of China National Space Industrial Corporation.Meanwhile,the backscattering cross-sections have been computed with the transition(T) matrix method.The theoretical results are compared with the experimental data,showing that the calculations are consistent with the observations in general.Experimental and theoretical analyses indicate that the backscattering cross-section of non-spherical particles increases as the particle size parameter increases,and fluctuates when the sizes are larger under the effect of resonance scattering.Differential reflectivity ZDR of water oblates in natural rainfall is always greater than 0dB whereas ZDR of hailstones may be negative.There is a good linear relationship between differential reflectivity and aspect ratio of a particle.These derivations agree with the literature and can be used to identify the presence of hail particles and distinguish between plate-type and columnar-type hydrometeors.In this study,the measuring experiment and the T-matrix method calculations for the scattering of simulated raindrop and ice particles are also briefly described.
Non-spherical hydrometeors, Backscattering, Differential reflectivity ZDR, T-matrix method, Lab observations
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王振会, Wang Zhenhuia, ∗, Xu Xiaoyonga, Wang Qing-anb, Chao Zengmingc
Journal of Quantitative Spectroscopy & Radiative Transfer 77(2003)455-462,-0001,():
-1年11月30日
Twenty sphere-cone-oblate ice particles are simulated for their backscattering observations in a microwave lab and calculations are done with the DDA method.The lab experiment and the DDA theory are brie7ypresented in this paper.The theoretical results are compared with the lab observations.It is shown that the theoretical results are consistent with the experimental data in general and that the backscattering ability of sphere-cone-oblate ice particles increases as the particle size parameter increases,and 7uctuates in the so-called resonance region.The backscattering cross sections of sphere-cone-oblate ice particles depend not only on their sizes equivolume spherical radii Re but also on their shapes.There is a statistically linear relationship between di:erential re7ectivity ZDR and the shape factor, 2a/h,which is the ratio of the horizontal scale to the vertical scale of a particle.
Sphere-cone-oblate, Backscattering, Lab observations, DDA computations
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