Large raindrops against melting hail: calculation of specific differential attenuation, phase and reflectivity
Large raindrops against melting hail: calculation of specific differential attenuation, phase and reflectivity
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大雨滴对抗融化冰雹：特定差分衰减、相位和反射率的计算
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
B. Notaroš
中科院分区：
文献类型：
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作者：
M. Thurai;E. Chobanyan;V. Bringi;B. Notaroš
计算和研究了大雨滴和一种特殊形式的冰雹融化引起的比微分衰减。考虑了光滑圆锥形的雨滴和由水环包围的冰球模拟的冰雹。对于前者，散射计算采用T-矩阵方法，而对于后者，则采用表面积分方程组中的高阶矩方法。结果表明，冰雹粒子的比微分衰减因子要高得多，最小的冰雹显示出与最大雨滴相似的值。这可以解释C波段雷达在强烈风暴中观察到的比预期更高的差异衰减，正如以前的一些研究所报道的那样。结果还表明，融化的冰雹粒子表现出比大雨滴更高的比差分相因子，但具有相似的差分反射率。
The specific differential attenuation caused by large raindrops and a special form of melting hail is computed and studied. Raindrops of smoothed conical shapes and hailstones modelled by an ice sphere surrounded by a water torus are considered. For the former, scattering computation is carried out by the T-matrix method, while the higher-order method of moments in the surface integral equation formulation is used for the latter. Results show a much higher specific differential attenuation factor for hail particles, with the smallest hail showing values similar to the largest raindrops. This can explain the higher than expected differential attenuation observed by C-band radars in intense storms as reported in some previous studies. Results also show that the melting hail particles exhibit higher specific differential phase factor than large raindrops, but have similar differential reflectivity.