Geometrical thickness, liquid water content, and radiative properties of stratocumulus clouds over the Western North Pacific
Geometrical thickness, liquid water content, and radiative properties of stratocumulus clouds over the Western North Pacific
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DOI：
10.1175/1520-0450-34.2.460
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发表时间：
1995-02
期刊：
影响因子：
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通讯作者：
T. Hayasaka;T. Nakajima;Y. Fujiyoshi;Y. Ishizaka;T. Takeda;Masayuki Tanaka
中科院分区：
文献类型：
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作者：
T. Hayasaka;T. Nakajima;Y. Fujiyoshi;Y. Ishizaka;T. Takeda;Masayuki Tanaka
摘要提出了一种由实测液态水路径和0.94 μm水汽吸收带等效宽度反演云几何厚度的算法。该算法被应用到飞机观测获得的微波辐射计和光谱仪在1991年冬季在西北太平洋。云的几何厚度的反演值往往比肉眼观测的小，特别是对于水平不均匀的云。在可见光和近红外光谱区的云反射率的测量值也与计算值进行了比较。对于均匀的云，存在一个单一的液滴尺寸分布，满足两个光谱区域。然而，对于不均匀的云，没有一个单一的尺寸分布存在，满足在两个光谱区域观察到的最大值。
Abstract An algorithm was developed for retrieving cloud geometrical thickness from a measured liquid water path and equivalent width of 0.94-µm water vapor absorption band. The algorithm was applied to aircraft observations obtained by a microwave radiometer and a spectrometer in the winter of 1991 over the western North Pacific Ocean. Retrieved values of the cloud geometrical thickness are apt to be smaller than those observed by eye, especially for horizontally inhomogeneous clouds. Measured cloud albedos in the visible and near-infrared spectral region were also compared with calculated values. For homogeneous clouds there exists a single droplet size distribution that satisfies both spectral regions. However, for inhomogeneous clouds no single size distribution exists that satisfies the albedo observed in both spectral regions.