| 冰—水球形粒子在太阳短波段的吸收与衰减 |
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| 引用本文： | 陈洪滨,孙海冰.冰—水球形粒子在太阳短波段的吸收与衰减[J].大气科学,1999,23(2):233-238. |
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| 作者姓名： | 陈洪滨 孙海冰 |
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| 作者单位： | 中国科学院大气物理研究所中层大气与全球环境探测开放实验室,北京 100029 |
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| 摘 要： | 根据Mie理论以及Aden和Kerker的理论，分别计算了纯水、纯冰和冰—水分层同心球在可见光和近红外波段的吸收、散射与衰减截面。结果表明，对于同样尺度大小的粒子，表面融化冰球或冰外壳包水球的单次散射特征值与纯冰纯水球的相比在整个太阳辐射短波段都相差不大，这是因为在此波段范围内冰和水的复折射指数的实部和虚部都很接近。此结果基本排除了0℃层附近表面融化冰晶粒子在太阳波段可能产生强吸收带，从而可以解释（部分的）云吸收异常现象这一想法。另一方面，在整层云吸收计算中，相对水含量可能较小但尺度较大的冰晶粒子的吸收是
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| 关 键 词： | 冰粒子 表面融化冰球 太阳辐射 吸收 |
Absorption and Scattering Properties of Surface Melted Ice Sphere in Visible and Near Infrared Regions |
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| Chen,Hongbin and Sun Haibing.Absorption and Scattering Properties of Surface Melted Ice Sphere in Visible and Near Infrared Regions[J].Chinese Journal of Atmospheric Sciences,1999,23(2):233-238. |
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| Authors: | Chen Hongbin and Sun Haibing |
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| Abstract: | Based on the Mie theory and the theory by Aden and Kerker;; the absorption and scat-tering cross-sections of concentric spherical water and ice particles are computed in the solar radiationspectrum ranging from 0.3-to 4.0um of wavelength. The results show that because both the real andimaginary parts of refractive indices for water and ice are quite close in visible and near infrared bands;;there are little differences in the absorption and scattering properties between pure water;; pure icespheres and coneentric water-ice (ice-water) spheres. It is therefore unlikely to explain the phenomenonof cloud absorption anomaly simply by the surface melted ice particles which cause the bright bandsnear 0oC isotherm in stratiform clouds as seen in microwave radar observations. However;; ice particlesincluding water-ice crystals have to be taken into account in calculating the absorptivity of solar radia-tion by mixed-phase clouds since the absorption cross-section increases quickly with increasing particlesize and the effective radius of ice crystals are much larger than those of liquid water droplets. |
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| Keywords: | ice particles surface melted ice spheres solar radiation cloud absorption |
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