Diurnal effects in the composition of cirrus clouds

Diurnal effects in the composition of cirrus clouds
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卷云组成的日间影响

DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
V. Khvorostyanov
V. Khvorostyanov
中科院分区：
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文献类型：
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作者：
K. Sassen;K. Liou;Y. Takano;V. Khvorostyanov

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扩展（7-y）偏振激光雷达数据，这是敏感的冰晶形状和方向，被用来搜索由太阳加热引起的卷云的日变化。白天的平均线消偏振比夜间低0.02，在45°太阳角处最小，比夜间平均值0.350低0.05。使用散射模拟的昼夜模式的分析表明，板晶体是在白天更常见的，和太阳能加热和水平板方向的维护之间发生的反馈。这种各向异性也会影响卷云的太阳辐射，这是气候建模者面临的另一个复杂问题。
Extended (7‐y) polarization lidar data, which are sensitive to ice crystal shape and orientation, are used to search for diurnal changes in cirrus clouds caused by solar heating. Average linear depolarization ratios are ∼0.02 lower during the day than night, minimizing at a 45° sun angle at ∼0.05 lower than the 0.350 nighttime average. Analysis of the diurnal pattern using scattering simulations suggests that plate crystals are more common during daylight, and that a feedback occurs between solar heating and the maintenance of horizontal plate orientations. This anisotropy also affects the cirrus solar albedo, representing an additional complication confronting climate modelers.