Observational Study On Physical And Chemical Characteristics Of Three-stage Fog Water In Mount Lushan In Winter

To explore different diameter droplets chemical composition characteristics,as well as the physical and chemical characteristics of different types of fog,in 2015 and2016 in Lushan cloud physical and chemical characteristics of the comprehensive experiment,the use of active along the mist collector?three-stage CASCC?collect altogether 44 group level 3 points and particle size of samples of mist droplets,the step aerodynamic diameter>22?m?S1?,16?22?m?S2?and 4?16?m?S3?.With 850professional IC type chromatograph?Swiss wantong?analysis about the eight kinds ofcombined with the observation test for aerosols,droplets spectral and automatic station data,discuss the triple step about the chemical characteristics and the source of the ionic composition in different size about and correlation and analysis of the physical and chemical characteristics of different types of fog.The results show that:?1?In the winter of 2015,the p H of lushan fog water ranged from 4.12 to 7.39,with an average of 5.0;in the winter of 2016,the p H of Lushan fog water ranged from3.96-5.82,with an average of 4.6.Both were acidic.Compared to two years in lushan winter observation found that every level about the acidity in strengthening,unlike the mist p H conductivity change significantly between the different size,and particle size had no obvious correlation between ion,but with the change trend of total ion concentration has a consistency,characterized by high concentration at night and after sunrise concentration is relatively low.?2?In the winter of 2015 and 2016,the main ions in the three-level classification droplets.The concentration of NO₃^-and SO₄^2-in fog water in 2016 was lower than that in 2015.?3?The analysis results of the source of ionic components show that Mg²⁺ is affected by Marine and soil sources,and K⁺ and Ca²⁺ are mainly from the emissions from soil and man-made sources.NO₃^-and SO₄^2-are less affected by Marine and soil sources,and are mainly affected by man-made sources.In 2015,Cl^-in fog water was mainly affected by anthropogenic sources,and in 2016,it was mainly affected by Marine sources,and the anthropogenic input was significantly reduced.?4?Medium fog droplets?16?22?m?and small fog droplets?4?16?m?were component in small fog droplets.Compounds in the form of?NH4?₂SO₄,NH₄NO₃ and Mg?NO₃?₂,Ca?NO₃?₂and Ca SO₄ were found in large droplets?>22?m?,and the types of these compounds were gradually reduced in small and medium droplets.SO₄^2-has?5?Of the advection fog droplets average concentration is the largest,followed by the advection radiation fog and rain fog.Peace advection fog flow radiation fog,on average,the average diameter were similar,slightly bigger than for fog.Advection of radiation fog LWC is double mist.There is a big difference between spectral distribution of different types of fog,mist narrower spectrum distribution,maximum droplets are not more than 22?m,advection radiation fog the spectral distribution of the widest,advection fog,the spectral distribution of narrow and the radiation of the advection fog.?6?Aerosol droplets and influence each other,rain fog flow radiation fog,advection fog peace for the removal of the aerosol has very big effect,the narrowest only average spectral radiation advection fog sol,followed by the advection fog and rain fog,fog advection fog flow radiation peace of small diameter of aerosol particle has very strong scavenging effect,rain fog cleared to larger diameter of aerosol particles are relatively weak,advection radiation fog cleared to larger diameter of aerosol particles is relatively strong.The advection fog and rain fog in every period of the number of the aerosol particle size is greater than the advection radiation fog.