Variation characteristics of visibility and its main influencing factors in Dandong,Liaoning province
Based on the visibility data from the instrumental observation and manual observation from June 2007 to November 2009 in Dandong,relationship between these two records was analyzed. The effects of particle concentrations such as PM10 ,PM2.5 and PM1.0 in the different seasons on the visibility were discussed. The relationship between precipitation intensity and wet removal efficiency of PM was analyzed. The results indicate that the visibility ratio between visual measurement and instrumental measurement is small under the low visibility condition. The proportion of PM10 is larger when the visibility is poor,and the mean monthly wind speed is in the negative correlations with the values of PM1.0/PM1.0 and PM2.5/PM10. The more the weather phenomena are in a month,the poorer the relatively mean monthly visibility is. The change of mean daily mass concentration of PM and the wet removal efficiency of PM to precipitation are related to precipitation intensity. The average visibility values from both visual measurement and instrumental measurement decrease with the increasing of precipitation intensity.
国家科技期刊平台
NSTL
万方数据
维普
