引用本文:杨茜, 高阳华, 李振亮.重庆市霾天气下大气能见度与颗粒污染物的关系[J].西南大学学报(自然科学版),2019,41(9):134~140
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重庆市霾天气下大气能见度与颗粒污染物的关系
杨茜, 高阳华, 李振亮1,2
1. 重庆市气象科学研究所, 重庆 401147;2.
2. 重庆市环境科学研究院, 重庆 401147
摘要:
利用重庆沙坪坝站2013-2015年逐时环境气象资料,对大气能见度与相对湿度和PM2.5之间的关系进行分析研究,结果表明:重庆市区霾都是在相对湿度大于65%的条件下产生的,重度霾时相对湿度达到86%左右,重庆粗细粒子质量比PM2.5/PM10在霾发生时大于65%,重度霾情况下粗细粒子质量比达82%,说明伴随着细粒子比例的增加,PM2.5细颗粒对能见度的影响作用明显,重庆霾进一步加重,PM2.5相对PM10来说对霾影响作用更大.不同相对湿度条件下,能见度与PM2.5颗粒物关系不同,在70%≤RH<80%湿度条件下PM2.5与大气能见度相关性最大,非霾天气下PM2.5阈值仅为30 μg/m3.相对湿度在40%~90%之间,随着相对湿度的增加,颗粒物逐渐吸湿增长,其产生消光效应逐渐加剧,导致能见度不断降低,在PM2.5质量浓度大于85 μg/m3情形下,不论相对湿度大小,都极易形成霾天气,而PM2.5质量浓度小于85 μg/m3情形下,如果相对湿度较高,随着湿度变化颗粒物吸湿增长,也极易形成霾天气.
关键词:  能见度  相对湿度  PM2.5  
DOI:10.13718/j.cnki.xdzk.2019.09.017
分类号:X51
基金项目:重庆市气象局2017年业务技术攻关团队-农业气象与生态环境应用技术攻关团队项目(YWGGTD-201714);重庆市技术创新与应用示范重点项目(cstc2018jszx-zdyfxmX0003);重庆市技术创新与应用示范一般项目(cstc2018jscx-msybX0149).
Relationship Between Atmospheric Visibility and Particulate Pollutants in Haze Weather in Chongqing
YANG Qian, GAO Yang-hua, LI Zhen-liang1,2
1. Chongqing Institute of Meteorological Sciences, Chongqing 401147, China;2.
2. Chongqing Academy of Environmental Science, Chongqing 401147, China
Abstract:
Based on the hourly environmental meteorological data from 2013 to 2015 in Shapingba Meteorological Station of Chongqing, the relationship of atmospheric visibility with relative humidity and PM2.5 was analyzed. The results showed that the haze in Chongqing city was produced under the condition of a relative humidity greater than 65%; that relative humidity reached about 86% in severe haze; that PM2.5/PM10 (fine and coarse particle ratio) was more than 65% when haze occurred and 82% under severe haze conditions, suggesting that with the increase in the proportion of fine particles, the effect of PM2.5 fine particles on visibility became more obvious, thus further aggravating haze in Chongqing; and that the effect of PM2.5 on haze was greater than that of PM10. The relationship between visibility and PM2.5 particles differed with relative humidity. The correlation between PM2.5 and atmospheric visibility was the greatest under the condition of 70% < RH < 80% humidity. The threshold of PM2.5 was only 30 μg/m3 under non-haze weather. When the relative humidity was between 40% and 90%, with the increase in relative humidity, the particles gradually increased its moisture absorption and their extinction effect gradually intensified and, as a result, the visibility was reduced. When the mass concentration of PM2.5 was greater than 85 μg/m3, haze weather was most likely to occur regardless of the relative humidity, and when the mass concentration of PM2.5 was less than 85 μg/m3 and the relative humidity was high, haze weather was also most likely to occur due to higher moisture absorption by the particulates.
Key words:  visibility  relative humidity  PM2.5  haze
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