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Abstract
利用AIM卫星搭载的CIPS云成像探测器获得的云图数据，提取2008-2009年南北半球共6664个小尺度重力波（波长10～150km）个例，通过重力波区域与背景云层反照率变化值的对比分析，研究重力波引起云层反照率的变化特征.结果表明，重力波引起的反照率变化值以正值为主，最大平均值4.48×10<sup>-6</sup>sr<sup>-1</sup>出现在南半球降交轨道.反照率变化值与IWC变化值正相关，相关系数均在0.85以上.重力波引起的反照率变化呈现出很强的纬度和时间依赖性，且几乎均为正值.反照率变化值在中期阶段（冬/夏至日之后的50天）的高纬地区（>70°）更大，但在中期以外始末阶段的低纬地区（<70°）逐渐变小，甚至开始出现负值.随着背景云层的增强，反照率平均值呈线性增大，小尺度重力波能够引起背景云层反照率约14.6%～28.8%的变化量.当重力波引起的反照率周期性变化的振幅逐渐增大时，反照率变化值也线性增大，变化率约为0.909%～1.194%.南半球的变化率整体比北半球稍小，这与背景大气条件的差异有关
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