转动拉曼米氏散射激光雷达反演气溶胶消光系数

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利用激光雷达米氏(Mie)散射回波信号与转动拉曼(Raman)回波信号的差值,结合已知的大气分子消光系数,构造纯气溶胶回波用以反演气溶胶消光系数。假设气溶胶消光后向散射比在相邻高度上相近,即微分为零,根据纯气溶胶回波信号公式推导出反演大气气溶胶消光系数的积分公式。该方法利用转动Raman散射信号与气溶胶后向散射无关的特性去除Mie散射信号中大气分子后向散射部分,降低了大气分子数密度波动对反演结果的影响,用积分反演提高了结果的稳定性。最后用自行研制的转动拉曼米氏(Raman-Mie)散射激光雷达(RRML)回波信号对该方法进行验证,结果表明该方法能有效地反演气溶胶消光系数廓线。
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