激光雷达与微波辐射计联合观测大气边界层高度变化

摘要

为了研究苏州地区大气边界层结构的日变化及季节特征,利用2014年1-7月期间大气颗粒物激光雷达对苏州上空大气气溶胶进行了连续观测.选定2014年1月15日、3月16日、5月7日与7月22日全天的消光系数探测数据,通过优化后的梯度法得到了该地区的大气边界层高度,分析了其日变化特征,并分析了边界层高度与地表的温湿变化之间的相关性.结果表明除1月15日外,边界层的变化与地表温度存在明显的正相关,而与地表的相对湿度存在负相关.同时,对站点微波辐射计观测得到的温湿廓线与边界层内消光系数廓线进行了联合研究.研究结果表明,微波辐射计湿度垂直廓线与激光雷达消光系数廓线探测得到的边界层具有良好的一致性.%In order to study the diurnal variation and seasonal characteristics of the atmospheric boundary layer structure in Suzhou,this study conducted continuous observation of aerosols detected by lidar from January to July 2014.The measurements of diurnal variation about extinction coefficient on 15 January,16 March,7 May,and 22 July 2014 are selected and the daily ABL heights by the optimized gradient method in this area are calculated.The correlation between ABL height and ground temperature & humidity is relatively high.The results show that the changes of the ABL height have a significant positive correlation with surface temperature and a negative relationship with the relative humidity,except for 15 January.Meanwhile,a joint study is conducted between the profiles of temperature and humidity data from the microwave radiometer and the profiles of extinction coefficient,and gained a good consistency between this two data.