南京大学学报（自然科学版）Issue(3)：473-480,8.DOI:10.13232/j.cnki.jnju.2015.03.003
杭州市区相对湿度及 PM2.5对能见度的影响分析
The analysis of relative humidity and PM2.5 impact on visibility in Hangzhou
摘要
Abstract
The relationship between atmospheric visibility(V)and its relevant affecting factors,such as the relative humidity(RH)and the mass concentration of particulate matter in Hangzhou from 2012 to 2013 is analyzed with statistic method in this paper.The results show that,atmospheric particles in Hangzhou grow obviously through moisture absorption.The relative humidity(RH)has prominent effect on the visibility when it is equal to or greater than 80%,while it has less impact than that of PM2.5 concentration on the visibility when itis less than 80%,or in the dry haze process.Secondly,the massconcentration of PM2.5 matter is exponential with the visibility,and a more closed relation is found when RH is less than 80%.Third,impact of PM2.5 reduction on visibility shows differently when the PM2.5 concentration is varied.That is,when the PM2.5 concentration reduces from 1 50 μg·m-3 to 75μg·m-3 ,the visibility will not be much improved,while when the PM2.5 concentration reduces to the level of less than 50 μg·m-3 ,it will be very helpful in the visibility melioration.Furthermore,the characteristics of atmospheric visibility show high identity in fog-haze conversion caused by radiation cooling according to the high temporal resolution meteorological data.关键词
能见度/相对湿度/PM2.5/消光系数Key words
visibility/relative humidity/PM2.5/extinction coefficient分类
天文与地球科学引用本文复制引用
杜荣光,齐冰,胡德云,李璐,俞布..杭州市区相对湿度及 PM2.5对能见度的影响分析[J].南京大学学报（自然科学版）,2015,(3):473-480,8.基金项目
国家公益性行业(气象)科研专项(GYHY201206011),杭州市科技局社会发展科研专项(20130533B09) （气象）
