The influence analysis of precipitation on aerosol in urban area based on ground-Based remote sensing observations
DONG Jiadan1， CHEN Xiaoling1， CAI Xiaobin2， GUAN Yuting1，XU Qiangqiang1， LI Tinghui1， CHEN Fang1
1.State Key Laboratory of Information Engineering in Surveying， Mapping and Remote Sensing， Wuhan University， Wuhan 430079， China； 2.Institute of Geodesy and Geophysics， Chinese Academy of Sciences， Wuhan 430077， China
Abstract：It is rather complicated how precipitation impacts on the mass concentration of aerosol particles in urban area. As an area dominated by urban aerosol particles， Wuhan is one of the major city in China. A persistent heavy rainfall there in 2016 were chosen to analyze the rainfall-caused concentration changes of three types typical aerosol particles， Water-insoluble Aerosol Particles(INSO) ，Water Soluble Aerosol Particles (WASO) and Black Carbon Aerosol (or SOOT). After the optical property interpolation of three channels， ground-based CE-318 sun-sky radiometer observations was used to inverse the aerosol particles number density of these three types of aerosol based on the least squares linear regression. Besides， GADS dataset were used to derive the corresponding mass concentration of INSO， WASO and SOOT. To validate the inversion accuracy， the theoretical optical property parameters including SSA、AOD and ASYM were used as the reference. The results showed the inversion methods has rather good performance. Furthermore， the different effect of precipitation on the three types aerosol was also found. The rainfall has significant reduction impact on WASO， INSO and SOOT. However， the duration of the reduction effect have significant difference among these three types aerosols. WASO recovered gradually after the precipitation， its ratio in total aerosol mass increased significantly and achieved to 88.30%. As for INSO， precipitation’s suppression effect can lasts for a long time， up to several weeks. The rainfall effect of SOOT only can last several hours， and it is very limited to improve the atmospheric environment. Due to the increased probability of acid rain， the rainfall effect on WASO should get more attention in a city as Wuhan.
董佳丹,陈晓玲,蔡晓斌,关宇廷,徐强强,李婷慧,陈 芳. 基于地基遥感的降水过程对城市型气溶胶差异性影响分析[J]. 华中师范大学学报(自然科学版), 2020, 54(3): 463-471.
DONG Jiadan,CHEN Xiaoling,CAI Xiaobin,GUAN Yuting,XU Qiangqiang,LI Tinghui,CHEN Fang. The influence analysis of precipitation on aerosol in urban area based on ground-Based remote sensing observations. journal1, 2020, 54(3): 463-471.
2020, Vol. 54 
