基于激光雷达和微波辐射计观测确定混合层高度方法的比较  

Comparison of the Mixing Layer Height Determination Methods using Lidar and Microwave Radiometer

作　　者：杨富燕[1,2] 张宁[1] 朱莲芳[3] 朱焱[3] 

机构地区：[1]南京大学大气科学学院,南京210046 [2]贵州省山地环境气候研究所,贵阳550002 [3]苏州市气象局,苏州215131

出　　处：《高原气象》2016年第4期1102-1111,共10页Plateau Meteorology

基　　金：国家重点基础研究发展计划(973)项目(2011CB952002);国家自然科学基金项目(41375014)

摘　　要：利用苏州地区2010年1月4,7,16日和2月4日4天的激光雷达及微波辐射计观测资料,比较了不同遥感手段探测晴天大气混合层高度的差异,发现试验期间该地区的混合层高度在300～1500 m之间。利用梯度法、标准偏差法、小波法从激光雷达数据中提取混合层高度并进行了对比,结果表明三种方法都能较好地反演混合层高度并且一致性较好,三者差异主要存在于大气边界层的发展和消亡阶段;梯度法和小波法结果无明显差异,而标准偏差法结果稍高于其他方法。在此基础上,利用微波辐射计探测的大气温度,使用温度梯度法估算大气混合层高度,并与激光雷达探测结果进行了比较,结果表明,大多数情况下激光雷达探测结果高于微波辐射计观测结果;两种遥感手段有较好的相关性,相关系数为0.76。激光雷达同微波辐射计结果存在差异,尤其是在边界层的发展和消散阶段,这是由两种遥感手段探测原理不同造成的。Methods for determining the mixing layer height based on a lidar and a microwave radiometer were compared during four sunny days（on 4,7,18 January and 4 February,2010）in Suzhou.The observed mixing layer height varied between 300 m and 1500 m.The gradient method,the standard deviation method and the wavelet method were applied to extracting the mixing layer height from the lidar.Results showed that the three methods can determine the mixing layer height well and have a good agreement among them,the differences mainly occurred during the development and disappearance of the mixing layer,results by the gradient method and the wavelet method show little difference,while the standard deviation method results are slightly higher than others.The results determined by the temperature gradient method using microwave radiometer data were compared with the results determined using the lidar observations; there was a good correlation between the results and the correlation coefficient was 0.76.The results from the lidar were higher than these from microwave observations.The difference between the two observation devices was because of the different detection principles,especially in the development and dissipation stage of the boundary layer.

关 键 词：混合层高度 激光雷达 微波辐射计 大气边界层 

分 类 号：P404[天文地球—大气科学及气象学]