Analysis Of Factors Affecting Aerosol Inversion And Aerosol Content In Nanjing

This paper mainly uses the Rayleigh-Raman-Mie Lidar observation data from Nanjing University of Information Science and Technology to study the influencing factors of aerosol inversion in Nanjing and uses the environmental monitoring data of nine national control points in Nanjing from March 1st,2014 to February 28th,2015 to study the influencing factors of aerosol mass concentration in Nanjing,we can draw the following conclusions:?1?Denoising the signal background and reprocessing the signal show that:taking the average value of the signal above 10km as the background noise is closer to the original signal strength than taking the minimum value as the background noise;It is found that the data after reprocessing using eleven-point smoothing,five-point-three-times smoothing,and wavelet denoising,the effect of eleven-point smoothing was the best;?2?The influencing factors of inversion result accuracy are analyzed by using the parameters k in the Klett method and the parameter Sa in the Fernald method,as well as the system overlap factor.It analyzed the influence of wavelength index k in Klett method by inversion results,where k ranges from 0.67 to 1.0.The change of k value will affect the peak value of extinction coefficient.With the increase of k value,the crest value will increase,but the overall change.It analyzed the influence of extinction coefficient at the reference height am in Klett method which ranges about 1.0×10-5 by inversion results,with the increase of ?m value,the crest value will increase,but it does not change the trend of extinction coefficient.Using the Fernald method to invert,between the value from 20 to 70,the aerosol extinction coefficient also changes with the change of the lidar ratio,but the value within this range has little effect on the inversion result.It can be seen from the partial enlargement that within the range of values,the value of the extinction coefficient obtained by inversion will decrease as the ratio of the lidar ratio increases;The system overlap factor has a great influence on near-surface aerosol inversion results,the closer to the ground,the smaller the non-corrected signal extinction coefficient value will be,however,the closer to the ground,the greater the corrected extinction coefficient will be;?3?The analysis of the influencing factors of aerosol content in Nanjing area shows that:the mass concentration of PM10 decreases with the increase of temperature and decreases with the increase of relative humidity;the effect of rain can greatly reduce the mass concentration of PMio,and the precipitation is mainly to remove coarse particles from inhalable particles.Particles with less effect on fine particles;The higher the wind speed is,the stronger the dilution and diffusion capacity of the pollutants;the air masses transported from the north of Nanjing are the most clean,and the airborne particulate matter content from the south is the highest,so the particulate matter content will increase when the southerly wind blows.The correlation between the mass concentration of SO₂,NO₂ and the mass concentration of PMio,PM2.5 is relatively strong.The greater the mass concentration of SO₂ and NO₂,the greater the mass concentration of aerosol.Compared to the influence of meteorological elements on aerosol content,the content of SO₂,NO₂ have a greater influence on aerosol content.