Comparative Analysis Of Water-soluble Components Of Aerosol In Central Cities And Coastal Areas Of Pearl River Delta

In order to study the characteristics of water-soluble ions of aerosols in urban and central cities of the Pearl River Delta,the characteristics of water-soluble ions of aerosols in Shenzhen and Guangzhou were studied by using MARGA data with high temporal resolutionThe main findings are as follows:1,The degree of anion and cation in Shenzhen and Guangzhou is better,A large proportion of the aerosols exist as the form of(NH4)2SO4.Secondary ions(NH4 +,SO42-,NO3-)account for more than 80% of the total water-soluble ions and are the main components of water-soluble ions.In the seasonal distribution characteristics,a variety of water-soluble ions showed seasonal characteristics of higher in dry season than wet season.In the diurnal variation characteristics,SO42-and NH4+ showed a daytime high and nocturnal diurnal variation,and the seasonal variation of NO3-was obvious,while the diurnal variation was not obvious.The concentration of NO3-was low at day but high at night,which may be affected by temperature.2,The analysis of the haze pollution in Shenzhen and Guangzhou,the day of haze pollution in Guangzhou and Shenzhen was 77 days and 172 days respectively,accounting for 10.62% and 23.50% of the total number of days.haze pollution in Shenzhen more serious than in Guangzhou.Haze pollution mainly occurs in the dry season(October to March).With the increase of haze pollution level,the concentration of secondary water-soluble ions increased obviously,indicating that secondary ions had an important contribution to haze pollution.The diurnal variation is more obvious with the increase of haze pollution level,which shows that the second generation of ions during the day to contribute to the great haze.Other water-soluble ions have little effect on haze pollution.In the analysis of the relationship between secondary ions and visibility,it was also found that the secondary ion had a significant negative correlation with respect to visibility,and the correlation coefficient was higher.3,This paper analyzes the influence of fireworks on the atmospheric particulate matter and its components during the Spring Festival in Guangzhou,the typical haze process in Guangzhou dry and wet season,and the analysis of the causes of a low visibility event in Shenzhen.It was found that the concentration of fireworks increased sharply in the concentration period of fireworks,and the increase of fireworks and firecrackers was mainly coarse particles in PM10,which was mainly fine particle pollution.The influence of fireworks on PM,K+,C l-and SO42-is the greatest,and the black carbon has a certain degree of influence.The concentration of particulate matter in the wet season is low but the proportion of fine particles is higher.The diurnal variation of particulate matter concentration in the haze process is the opposite.The accounted for water-soluble ions in haze process of dry season significantly higher than wet season;a low visibility event occurred in Shenzhen mainly caused by the increase in scattering coefficient;which is the most influented by secondary ion.The effect of others ions on the scattering coefficient is small and even negatively correlated;wind speed and pressure are negatively correlated with the scattering coefficient,and the relative humidity is positively correlated with the scattering coefficient.