摘要
利用重庆沙坪坝气象站人工与自动能见度对比观测资料,分析了2种资料的一致性和差异,在1~10km能见度范围内,自动观测能见度值比人工观测能见度值偏低15%左右.按照人工能见度10km作为轻雾或霾的判别阈值,利用自动能见度观测值则应将轻雾和霾的判别阈值调整为8.5km.利用逐时自动能见度、相对湿度及PM2.5资料建立了重庆雾、霾天气判别指标,即:自动观测能见度≥1km且<8.5km时,当相对湿度<85%,判识为霾,当相对湿度≥85%且<95%时,如果ρ(PM2.5)≥90μg/m3,判识为霾,如果ρ(PM2.5)<90μg/m3,判识为轻雾;自动观测能见度<1km时,当相对湿度≥95%判识为雾,反之应为雾、霾混合物.
Visibility data from manual and automatic observations at the Chongqing Shapingba station have been compared.In the distance of 1-10 km,visibility by automatic observation is about 15%lower than that of by manual observation.Hence,the threshold of mist/haze should be reduced from 10 km（in condition of manual observation）to 8.5 km（for automatic observation）.In this study,criteria for fog and haze in Chongqing are built by integrating hourly automatic visibility data,relative humidity and concentration of PM2.5 in the year 2014.When automatic visibility is between 1 and 8.5 km,if the relative humidity is lower than 85%,haze is identified,if the relative humidity is between 85%-95%and the concentration of PM2.5 is larger than 90μg/m3,haze is identified.When automatic visibility is less than 1 km,if the relative humidity is greater than or equal to 95%,and the concentration of PM2.5 is smaller than 90μg/m3,mist is identified;else it is the mixture of haze and mist.
出处
《西南师范大学学报（自然科学版）》
CAS
北大核心
2017年第10期78-83,共6页
Journal of Southwest China Normal University(Natural Science Edition)
基金
重庆市应用开发计划项目(cstc2014yykfA20004)
关键词
自动能见度
雾
霾
判别指标
automatic visibility
fog
haze
distinguishing index
