我国不同大气环境下亚微米颗粒物吸湿特性
发布时间：2019-08-24 09:30
【摘要】：利用吸湿性串联微分电迁移粒径分析仪(H-TDMA)开展颗粒物吸湿性测量,通过对观测结果进行整理,并结合其他研究成果对我国不同环境下亚微米颗粒物吸湿性进行表征.梳理了包括城市、乡村、高山和郊区近海岸点不同大气环境下11个观测点的测量数据,发现不同环境、不同季节的大气颗粒物来源不同,颗粒物吸湿性、粒径分布及模态分布特征差异大.城市点的吸湿参数?观测值约为0.1~0.3;乡村点比城市点略高,约0.15~0.4;高山点(118.11°E,30.07°N)的?约为0.2~0.3;郊区近海岸点(114.17°E,22.28°N)的?约为0.2~0.4.除北京郊区点(怀柔冬季观测)外,其余乡村点和城市点均观测到亚微米颗粒物吸湿性随粒径增加而增强;高山点和郊区近海岸点的颗粒物吸湿性随粒径的变化不显著.除高山点(黄山)观测到较高频率的单模态分布(只有吸湿模态)外,其他观测点均呈现2~3个模态分布,说明颗粒物呈外混态.北京和杭州的H-TDMA观测结果显示颗粒物吸湿性随着相对湿度(RH)的增加而增加,没有表现出与纯硫酸铵类似的潮解行为.颗粒物吸湿性与化学组分的闭合研究发现,与离线膜采样获取的化学组分相比,高时间分辨率的在线化学粒径谱分布信息可以有效提高闭合度,同时有机物的密度与吸湿性,黑碳颗粒物质量浓度谱分布的精确估算将进一步提高闭合度.
[Abstract]:The hygroscopicity of particles was measured by hygroscopicity series differential electromigration particle size analyzer (H-TDMA). The hygroscopicity of submicron particles in different environments in China was characterized by sorting out the observed results and combining with other research results. The measured data of 11 observation points in different atmospheric environments, including urban, rural, alpine and suburban coastal points, are combed. It is found that the sources of atmospheric particles in different environments and seasons are different, and the hygroscopicity, particle size distribution and modal distribution characteristics of particles are very different. The moisture absorption parameters of the city point? The observed value is about 0.1 鈮，
本文编号：2528874
[Abstract]:The hygroscopicity of particles was measured by hygroscopicity series differential electromigration particle size analyzer (H-TDMA). The hygroscopicity of submicron particles in different environments in China was characterized by sorting out the observed results and combining with other research results. The measured data of 11 observation points in different atmospheric environments, including urban, rural, alpine and suburban coastal points, are combed. It is found that the sources of atmospheric particles in different environments and seasons are different, and the hygroscopicity, particle size distribution and modal distribution characteristics of particles are very different. The moisture absorption parameters of the city point? The observed value is about 0.1 鈮，
本文编号：2528874
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