Based on the onboard lidar data from CALIPSO satellite of National Aeronautics and Space Administration(NASA)from January 2007 to November 2010, the relationship between 0~2 km altitude aerosol microphysical properties and surface relative humidity during the haze in Shanghai was revealed by analyzing the parameters of 532 nm total attenuated back scattering coefficient, volume depolarization ratio and total attenuated color ratio. The results showed that when the 532 nm back scattering coefficient was in the range of 0 to 0.001 km-1·sr-1, the frequency of 532 nm back scattering coefficient was the largest with the surface relative humidity of 65%~80%. However, when the 532 nm back scattering coefficient was greater than 0.001 km-1·sr-1, its frequency reached the maximum with the surface relative humidity of 50%~65%. The main constituents of lower troposphere were regular aerosols and the most regular aerosols appeared on the relative humidity was within 65%~80%, while the most irregular aerosols appeared on the relative humidity was within 50%~65%. In addition, fine particle aerosols were the dominant aerosols of lower troposphere in the haze. With the increase of surface relative humidity, the aerosol particle size increased, and the proportion of large aerosols were highest when the surface relative humidity was within 80%~95%.%用2007年1月至2010年11月美国国家航空航天局（NASA）的CALIPSO星载激光雷达资料，通过532 nm总后向散射系数、体积退偏比和色比，分析了上海地区霾期间低层0~2 km高度气溶胶微物理属性与地面相对湿度的关系。结果表明，当地面相对湿度为65%~80%时，后向散射系数在0~0.001 km-1·sr-1范围内出现的频率最大；当地面相对湿度为50%~65%时，后向散射系数大于0.001 km-1·sr-1的频率最大；低层大气中聚集的主要是规则气溶胶粒子，当地面相对湿度为65%~80%时，气溶胶粒子最为规则，其次为80%~95%的地面相对湿度。当地面相对湿度为50%~65%时，不规则气溶胶粒子所占比重较大；霾期间，低层大气中细粒子气溶胶均占主导地位，但随着地面相对湿度的增大，气溶胶粒子粒径逐渐增大。在地面相对湿度为80%~95%时，大颗粒气溶胶相对较多。
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