• 关键词：MODIS  AOD  Logistic曲线  “湿”消光系数

• 基金项目：国家自然科学基金重大研究计划重点支持项目（No.91644226）；四川省环境保护重大科技专项（No.2013HBZX01）

• 朱育雷
• 成都信息工程大学大气科学学院, 成都 610225

• 倪长健
• 1 成都信息工程大学大气科学学院, 成都 610225;2 高原大气与环境四川省重点实验室, 成都 610225

• 孙欢欢
• 成都信息工程大学大气科学学院, 成都 610225

• 涂朝勇
• 成都信息工程大学大气科学学院, 成都 610225

• 摘要：针对气溶胶含量随高度呈负指数递减这一假设存在的问题,通过对Mie散射激光雷达探测资料的系统分析和总结,论证了Logistic曲线能更好地表征大气消光系数在边界层内的垂直演变特征.在对MODIS卫星遥感气溶胶光学厚度（AOD）系统偏差进行校正的基础上,将大气消光系数的模拟值与实测值之间离差平方和最小作为目标函数,利用小波协方差法计算混合层高度,以订正后的AOD和混合层高度作为约束条件,再用免疫进化算法优化目标函数中的参数,据此提出了MODIS卫星遥感AOD反演近地面"湿"消光系数的新模型.基于成都市2013年6月—2014年5月的MODIS卫星遥感AOD资料及同时次的Mie散射激光雷达探测数据和地面细颗粒物浓度资料的实例分析表明,新模型反演得到的近地面大气"湿"消光系数与近地面细颗粒物质量浓度之间的相关系数在四季均能稳定在0.6以上.

• Abstract：Aiming at the drawback of the hypothesis that aerosol content follows a negative exponent distribution with height, through systematic analysis and summary of Mie scattering LIDAR detection data, it is demonstrated that the logistic curve can be applied to better characterize the vertical distribution of atmospheric extinction coefficient in the boundary layer.Based on corrected systematic deviation of the MODIS AOD, a new inversion model of surface ‘wet’ extinction coefficient is established by using immune evolutionary algorithm to optimize its parameters.In this new model, the objective function is the least sum of squared errors (SSE) between the simulated and measured values of the atmospheric extinction coefficient, and the constraint conditions are AOD as well as MLH (mixing layer height) calculated by wavelet covariance method.Verified by the MODIS AOD data, the coincident Mie scattering LIDAR detection data, and the fine particulate mass concentration from June 2013 to May 2014 in Chengdu, the result shows that the correlation coefficients between the surface ‘wet’ extinction coefficients retrieved by the new model and the surface fine particulate mass concentration are all over 0.6 in the four seasons.

• Key words：MODIS  AOD  logistic curve  ‘wet’ extinction coefficient

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