摘要
对激光雷达产品的消光系数、退偏振比、边界层高度和气溶胶光学厚度进行统计分析,并与环境监测数据和地面气象观测数据进行对比,验证产品的可靠性。总的来说,大气消光系数垂直变化趋势是接近的,从近地面开始增大,在1km左右高度达到峰值,这就是边界层的所在。4月、11月和12月大气消光系数较高,大气气溶胶浓度较高,8月、9月和10月较低,气溶胶浓度较低,与环境监测数据相吻合。地面能见度和消光系数具有较好的指数相关;近地面处PM 2.5、PM 10的浓度和消光系数均具有较好的幂相关性;气溶胶光学厚度与PM 2.5、PM 10浓度有线性正相关;边界层高度与PM 2.5、PM 10存在显著的负相关,但是相比其他相关性不高;气溶胶光学厚度与能见度有负相关。
Through statistical analysis of extinction coefficient,depolarization ratio,boundary layer height and aerosol optical thickness of Lidar products,and comparison with environmental monitoring data and ground meteorological observation data,the reliability of the Lidar product is verified.By analyzing the vertical profile and temporal and spatial distribution of extinction coefficient,it is found that,in general,the vertical variation trend of atmospheric extinction coefficient is close,which starts to increase from near the ground and reaches the peak at the height of about 1km,where the boundary layer lies.Based on the data,in April,November and December,the atmospheric extinction coefficient is higher,the atmospheric aerosol concentration is higher,in August,September and October,and the aerosol concentration is lower,which is consistent with the environmental monitoring data.The correlation analysis of Lidar products with environmental monitoring data and ground meteorological observation data showed that the ground visibility and extinction coefficient have better exponential correlation;the concentration and extinction coefficient of PM 2.5 and PM 10 near the ground have better power correlation;the aerosol optical thickness has linear positive correlation with PM 2.5 and PM 10 concentration.There is a significant negative correlation between the height of the boundary layer and PM 2.5,PM 10,but it is not highly correlated with others.These correlation studies verify the effectiveness of Lidar in detecting atmospheric aerosols.
作者
邓孟珂
田鹏飞
蔡娜佳
杨梦兮
李由
DENG Meng-ke;TIAN Peng-fei;CAI Na-jia;YANG Meng-xi;LI You(Taizhou Meteorological Bureau,Taizhou Jiangsu 225300,China)
出处
《环境科学导刊》
2021年第2期50-54,67,共6页
Environmental Science Survey
关键词
激光雷达
气溶胶
退偏振比
光学厚度
边界层
Lidar
aerosol
depolarization ratio
optical thickness
boundary layer
