南京北郊秋季气溶胶理化特征及潜在源区分布

发布时间：2018-06-04 10:17

本文选题：单颗粒质谱 + 化学成分　；参考：《中国环境科学》2017年11期

【摘要】：利用单颗粒气溶胶质谱仪(SPAMS)于2015年秋季对南京北郊大气颗粒物进行了连续观测,选取了4类主要颗粒:富元素碳颗粒(EC)、富有机碳颗粒(OC)、富钾颗粒(K-rich)和富金属颗粒(Metal),占总颗粒数的比例分别为29.39%,9.53%,26.55%,8.54%.分析了不同天气下4类颗粒的粒子数和粒径分布的变化,采用后向轨迹模型和浓度权重轨迹方法,得到了各类颗粒的潜在源区分布.结果表明,清洁、清洁降雨、污染、污染降雨,4类天气采集到的颗粒物平均数分别约为2900,1300,6450,5950h-1.污染天气下,EC和Metal颗粒对当地颗粒物污染的贡献增大,各类颗粒的粒子数均大幅上升,并且除了OC颗粒,其他类颗粒粒径普遍向大粒径段偏移.强降水对各类颗粒均有明显的清除作用,其中大粒径段颗粒数下降最显著,但在污染降雨天气下,降水清除作用不明显,且对各类颗粒的清除作用存在粒径差异.不同来源气团携带的细颗粒物数量与类别存在差异,总体上海洋气团比内陆气团更清洁,气团经过陆地时会显著受到当地排放源的影响.细颗粒物的高贡献源区主要在本地及西南侧的安徽马鞍山一带,各类颗粒物的强潜在源区分布也存在明显差异.
[Abstract]:A single particle aerosol mass spectrometer (SPAMS) was used to continuously observe atmospheric particulate matter in the northern suburb of Nanjing in autumn 2015. Four main types of particles were selected: elemental carbon (ECN), organic carbon (OC), potassium rich (K-rich) and metal-rich (Metalanum), with a ratio of 29.399.53 and 26.558.54, respectively. The variation of particle number and particle size distribution of four kinds of particles under different weather conditions were analyzed. The potential source distribution of each kind of particles was obtained by using the backward trajectory model and the concentration weighted trajectory method. The results showed that the average of particulate matter collected from clean rainfall and polluted rainfall was about 2900g ~ (-1) ~ (-1) ~ (64) ~ (50) ~ (-1) ~ (-) ~ (59) h ~ (-1), respectively. Under the polluted weather, the contribution of EC and Metal particles to the local particulate pollution increased, and the particle number of all kinds of particles increased significantly. Besides OC particles, the other kinds of particles generally shifted to the large particle size section. Heavy precipitation has obvious scavenging effect on all kinds of particles, in which the number of particles in large particle size section is the most significant, but in the polluted rainfall weather, precipitation scavenging effect is not obvious, and there is a difference of particle size in the scavenging effect of various kinds of particles. The quantity and category of fine particles carried by air masses from different sources are different. Generally speaking marine air masses are cleaner than inland air masses and the air masses will be significantly affected by local emission sources when they pass through land. The high contribution sources of fine particulate matter are mainly located in the area of Ma'anshan, Anhui Province, and the distribution of strong potential sources of all kinds of particles is also obviously different.
【作者单位】：南京信息工程大学气象灾害预报预警与评估协同创新中心;南京信息工程大学中国气象局气溶胶-云-降水重点实验室;
【基金】：国家自然科学基金项目(91644203,91644224) 江苏高校优势学科建设工程资助项目(PAPD)
【分类号】：X513

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