| 华北平原南部农村地区黑碳气溶胶浓度及来源 |
| 摘要点击 1940 全文点击 612 投稿时间：2021-08-06 修订日期：2021-10-13 |
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| 中文关键词 黑碳气溶胶 华北平原南部 农村地区 来源解析 源区分布 |
| 英文关键词 black carbon aerosol the southern North China Plain rural region source identification source region |
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| 中文摘要 |
| 华北平原南部地区是当前我国大气污染的严重区域之一.作为连接南北方大气污染传输的关键区域，其大气环境研究相对薄弱.在华北平原南部某农村点位利用AE-33型黑碳仪，对2018年2~8月的黑碳（BC）气溶胶进行连续监测，采用光度计模型解析了黑碳来源.观测期间ρ（BC）的平均值为（3.51±2.29）μg ·m-3，冬季、春季和夏季的ρ（BC）平均值分别为（8.21±3.26）、（3.49±1.69）和（2.37±0.71）μg ·m-3.BC的季节性变化由气象因素和排放源的季节性变化共同导致.ρ（BC）日变化在08：00[（4.66±3.24）μg ·m-3]和20：00[（4.25±6.73）μg ·m-3]出现峰值，与居民做饭时间一致；在14：00[（2.44±3.33）μg ·m-3]出现谷值，与边界层高度较高有关.气溶胶波长吸收指数（AAE）在1.08~1.66之间，冬季、春季和夏季的AAE平均为1.41±0.08、1.28±0.10和1.20±0.06，表明该区域的BC来源以化石燃料燃烧为主.冬季生物质燃烧排放对BC的贡献率最高[（41±12）%]，与冬季居民燃烧木柴、秸秆等生物质燃料有关.冬季和春季受北方气团（40%）传输影响明显，夏季受南方气团（34%）传输影响明显.柴火堆取暖和民用煤炉使用等局地人为活动，以及周边区域气流的输送会导致该点位冬季BC浓度较高.研究结果对于了解农村地区黑碳气溶胶的浓度、来源及光学性质具有重要意义，也可为南方和北方大气污染物相互传输影响研究提供关键节点的数据支撑. |
| 英文摘要 |
| The southern North China Plain is currently one of the regions with serious air pollution in China. Despite its role as a key connection region for air mass transportation between south and north China, there are still few studies on the atmospheric environment in this region. To obtain the levels and sources of black carbon (BC) aerosol, an online continuous measurement of BC by Aethalometer Model AE-33 was conducted at a rural site in the southern North China Plain. The results indicated that the average ρ(BC) was (3.51±2.29) μg·m-3 during the observation period, and the average ρ(BC) were (8.21±3.26), (3.49±1.69), and (2.37±0.71) μg·m-3 in winter, spring, and summer, respectively. The seasonal variation in ρ(BC) was caused by the variations in meteorological factors and emission sources. ρ(BC) peaked at 08:00[(4.66±3.24) μg·m-3] and 20:00[(4.25±6.73) μg·m-3] within one day, which was consistent with the cooking time of local residents. The valley value appeared at 14:00[(2.44±3.33) μg·m-3] during the day, which was mainly related to the high boundary layer height. The aerosol absorption exponent (AAE) was between 1.08-1.66, and the average values were 1.41±0.08, 1.28±0.10, and 1.20±0.06 in winter, spring, and summer, respectively. This indicated that fossil fuel burning was a main source of BC in the rural area of this region. In winter, the contribution of biomass fuel burning emissions to BC was the highest[(41±12)%], which was related to the frequent burning activities of wood, straw, and other biomass fuels by local residents. The influence of northern air masses (40%) was obvious in winter and spring, and the influence of southern air masses (34%) was obvious in summer. The higher BC concentrations in winter were related to local human activities such as firewood heating and civil coal furnaces, as well as the long-range transportation of air masses. This study is helpful for understanding the concentration, source, and optical properties of BC in rural areas of China and also provides a dataset of the key note sites for investigating the interaction of atmospheric pollutant transport between North and South China. |
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