Microphysical properties of single and mixed-phase Arctic clouds derived from ground-based AERI observations
Microphysical properties of single and mixed-phase Arctic clouds derived from ground-based AERI observations
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来自地面 AERI 观测的单相和混合相北极云的微物理特性
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发表时间：
2003
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通讯作者：
D. Turner
中科院分区：
文献类型：
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作者：
D. Turner
提出了一种从混合相云中获取微物理特性的新颖方法。该算法从地基高分辨率红外辐射观测中获取云的光学厚度、冰含量以及水和冰粒子的有效尺寸。其理论基础是，在10 - 13μm波段，冰的吸收系数大于液态水的吸收系数，而在16 - 25μm波段，液态水比冰的吸收性更强。然而，由于水汽在转动吸收带的强烈吸收，对于较大的水汽含量（即，可降水量水汽超过约1厘米时），16 - 25μm光谱区域变得不透明。北极的特点是其干燥寒冷的大气以及大量的混合相云，因此这种方法适用于北极云。由于该方法使用红外观测，云的特性……
A novel new approach to retrieve microphysical properties from mixed-phase clouds is presented. This algorithm retrieves cloud optical depth, ice fraction, and the effective size of the water and ice particles from ground-based, high-resolution infrared radiance observations. The theoretical basis is that the absorption coefficient of ice is greater than that of liquid water from 10-13 μm, whereas liquid water is more absorbing than ice from 16-25 μm. However, due to the strong absorption of water vapor in the rotational absorption band, the 16-25 μm spectral region becomes opaque for significant water vapor burdens (i.e., for precipitable water vapor over approximately 1 cm). The Arctic is characterized by its dry and cold atmosphere, as well as a preponderance of mixed-phase clouds, and thus this approach is applicable to Arctic clouds. Since this approach uses infrared observations, cloud properties