The Characteristics Of Autumn Visibility In Yangtze Delta And Its Influence Factors Analysis

Development of Industry and economy leads to atmosphere quality depravation. Air pollution become one of most serious crisis that people must face. And that integrative phenomenon of Air pollution is atmosphere visibility reduced. By elementary survey show, fog affair is mostly reason why atmosphere visibility of Yangtze delta reduced. But with impact of haze and studded rubber pricking up. Yangtze delta become one among obvious brown area. Namely serious haze. So it results in complexity that affect visibility of Yangtze delta.The paper investigation category of visibility. Influence factors of visibility are as well referring simplicity weather condition (falling or fog that large-scale circumfluence leaded to) as considering city air pollution or collective function of air pollution and weather. Use 22 city atmosphere data in Yangtze delta district on Oct and Nov 2006. Analyzing temporal and spacial distributing of Yangtze delta visibility and setting intensify experiment. Analyze to correlations of visibility with pollution factors and Meteorological factor. Conclusion:(1) Visibility is lowest at 08:00 and highest at 14:00. East visibility is higher than central section and west. (2) When RH>50%, low visibility is appearing. When RH>90%, frequency of low visibility is most, RH is lower, frequency of high visibility is more. (3)Different type's weather, degree of factor affecting visibility is different. (4) Correction of visibility with PM2.5,NOx,RH is very marked and affect of other factors with their correction is very complex. And offer scientific gist for fathering and improving atmosphere quality of Yangtze delta.