南京地区相对湿度对气溶胶含量的影响

Effect of relative humidity on aerosol content in Nanjing

为了研究南京地区相对湿度对气溶胶的影响,利用位于南京信息工程大学的拉曼-瑞利-米氏激光雷达,分析湿度廓线对消光系数的影响;利用2014年3月～2015年2月国控点环境监测数据对可吸入颗粒物浓度特征进行统计,并与相对湿度进行逐月和四季对比分析,并计算各参数之间的相关系数,以期为南京市的城市布局与规划、大气污染治理等提供更多参考.结果表明,低空气溶胶的消光系数廓线与相对湿度廓线变化趋势高度一致,地面相对湿度与可吸入颗粒物浓度在一定湿度范围(以不发生重力沉降为界限)内,相对湿度越大越有利于颗粒物的形成,超过这个范围,相对湿度越大,颗粒物浓度越低,在南京地区,对于PM_(10)来说,这个界限在40%～49%,对于PM2.5来说,这个界限在50%～59%.

In order to study the effect of humidity on the aerosol in Nanjing,the influence of the humidity profile on the extinction coefficient was studied and analyzed by using the Raman-Rayleigh-Mie Lidar in Nanjing University of Information Science and Technology;Based on the environmental monitoring data from March 2014 to February 2015,the concentration characteristics of respirable particulate matter were statistically analyzed and compared with the corresponding humidity to contrast monthly and four-season comparative analysis,and then the correlation coefficient between the parameters was calculated with the view of the city layout and planning of Nanjing and to provide more air pollution control reference.It was showed that the extinction coefficient profile was consistent with the trend of relative humidity profile at low altitude.In the range where gravity sedimentation did not occur,the greater the relative humidity,the more favorable the formation of particulate matter,beyond this range,the greater the relative humidity,the lower the concentration of particulate matter.The limit is between 40%and 49%for PM10and between 50%and 59%for PM2.5 in Nanjing.