Estimation of PM2.5Mass Concentration from Visibility
Estimation of PM2.5Mass Concentration from Visibility
复制标题
从能见度估算 PM2.5 质量浓度
DOI：
10.1007/s00376-020-0009-7
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发表时间：
2020-07-01
影响因子：
5.8
通讯作者：
Huang, Mengyu
中科院分区：
文献类型：
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作者：
Ji, Denghui;Deng, Zhaoze;Huang, Mengyu
大气中的气溶胶不仅降低能见度，而且对人类健康和交通也有害。为了开发一种根据广泛测量的能见度来估算 PM2.5 质量浓度的方法，2019 年 1 月在中国西南地区进行了一次实地调查。测量了能见度、环境相对湿度 (RH)、PM2.5 质量浓度和干颗粒散射系数。活动期间，1月4日至9日和1月10日至16日发生两次污染事件。两集各可分为两个时期。第一阶段气溶胶吸湿性较高，大部分时间RH高于80%，有时甚至接近100%。第二期相对干燥但污染程度较高，气溶胶吸湿性低于第一期。由此可以建立不同相对湿度条件下 PM2.5 质量浓度与能见度（环境气溶胶消光）之间的经验关系。根据经验关系，可以根据能见度和相对湿度很好地估算PM2.5质量浓度。该方法对于PM2.5质量浓度的遥感具有重要意义。
Aerosols in the atmosphere not only degrade visibility, but are also detrimental to human health and transportation. In order to develop a method to estimate PM2.5 mass concentration from the widely measured visibility, a field campaign was conducted in Southwest China in January 2019. Visibility, ambient relative humidity (RH), PM2.5 mass concentrations and scattering coefficients of dry particles were measured. During the campaign, two pollution episodes, i.e., from 4–9 January and from 10–16 January, were encountered. Each of the two episodes could be divided into two periods. High aerosol hygroscopicity was found during the first period, when RH was higher than 80% at most of the time, and sometimes even approached 100%. The second period experienced a relatively dry but more polluted condition and aerosol hygroscopicity was lower than that during the first period. An empirical relationship between PM2.5 mass concentration and visibility (ambient aerosol extinction) under different RH conditions could thus be established. Based on the empirical relationship, PM2.5 mass concentration could be well estimated from visibility and RH. This method will be useful for remote sensing of PM2.5 mass concentration.