Mechanism for the formation and microphysical characteristics of submicron aerosol during heavy haze pollution episode in the Yangtze River Delta, China
Mechanism for the formation and microphysical characteristics of submicron aerosol during heavy haze pollution episode in the Yangtze River Delta, China
复制标题
长三角重度雾霾污染过程中亚微米气溶胶形成机制及微物理特征
DOI：
10.1016/j.scitotenv.2014.05.009
复制
发表时间：
2014-08-15
影响因子：
9.8
通讯作者：
Wang, Yuesi
中科院分区：
文献类型：
--
作者：
Wang, Honglei;An, Junlin;Wang, Yuesi
本文以2013年1月发生在长三角地区的一次严重污染事件为研究对象。此次事件是人为排放与异常大气环流、强冷空气活动的抑制和极为不利的弥散共同作用的结果。这一集包含三个雾霾事件（1月4日至9日，1月10日至13日，1月14日至16日）。在南京，用广谱粒子质谱仪（WPS）和单粒子气溶胶质谱仪（SPAMS）分别测量了10 ~ 10 μ m范围内气溶胶的粒径分布和0.2 ~ 2 μ m范围内单粒子的化学成分。结果表明：长三角地区PM2.5平均浓度大于110 μ g；(3)。PM2.5最高浓度为175.6 μ g。m（-3）发生在南京；其他城市的数值在110.8-147.3 μ g之间。(3)。PM2.5的平均浓度分别为58.3、122.7、145.4和154.7 μ g。M（-3）分别为洁净天和haze1、haze2、haze3天。PM2.5最高值为416.5、415.5和300.5 μ g。南京的m（-3）在三次雾霾事件期间发生。晴日和雾霾日气溶胶数浓度谱呈单峰型分布。最大比表面积峰位于0.5 ~ 0.7 μ m，分别为419、1397、1309和1378 μ m(2)。厘米(3)。Nm（-1）分别在清洁和haze1， haze2和haze3天。含生物质/生物燃料燃烧颗粒（biomass）、含有机碳颗粒（OC）、含元素碳颗粒（EC）、含硝酸盐颗粒（硝酸盐）和含硫酸盐颗粒（硫酸盐）的数量浓度在雾霾事件期间显著增加。霾1和霾2事件期间气溶胶化学成分与晴日相似，变化是由扩散条件差的局地颗粒物积累引起的。霾3期间EC粒子浓度高达24.76%，主要受周边城市输送污染物的影响。此外，不同化学成分的粒径分布也不同。(C) 2014 Elsevier B.V.版权所有
In this paper we investigate a severe pollution episode that occurred in the Yangtze River Delta (YRD) region in January 2013. The episode was caused by the combination of anthropogenic emissions and unusual atmospheric circulation, the depression of strong cold air activities and the very unfavorable dispersion. The episode contained three haze events (haze1: Jan. 4-9, haze2: Jan. 10-13, and haze3: Jan. 14-16). In Nanjing, aerosol size distributions from 10 nm to 10 mu m and chemical components of single particles from 0.2 to 2 mu m were measured with a Wide Range Particle Spectrometer(WPS) and a Single Particle Aerosol Mass Spectrometer (SPAMS), respectively. The results indicate that the mean PM2.5 concentrations in the YRD region were greater than 110 mu g . m(-3). The highest PM2.5 concentration of 175.6 mu g . m(-3) occurred in Nanjing; the other cities had values in the range of 110.8-147.3 mu g . m(-3). The average PM2.5 concentrations were 58.3, 122.7, 145.4 and 154.7 mu g . m(-3) on clean and haze1, haze2 and haze3 days, respectively. The highest PM2.5 values of 416.5, 415.5 and 300.5 mu g . m(-3) in Nanjing occurred during the three haze events. The spectra of the aerosol number concentrations had unimodal distributions on clean and haze days. The maximum surface area peaks were located at 0.5-0.7 mu m and had values of 419, 1397, 1309 and 1378 mu m(2) . cm(-3) . nm(-1) on clean and haze1, haze2 and haze3 days, respectively. The number concentrations of biomass/biofuel burning-containing particles (biomass), organic carbon-containing particles (OC), elemental carbon-containing particles (EC), nitrate-containing particles (nitrate) and sulfate containing particles (sulfate) increased significantly during the haze events. The chemical components of the aerosols during the haze1 and haze2 events were similar to those on clean days, and variations were caused by local particle accumulations under poor diffusion conditions. The high EC particle concentration of 24.76% during the haze3 event was impacted by the pollutants transported from surrounding cities. In addition, the different chemical components showed distinct size distributions. (C) 2014 Elsevier B.V. All rights reserved.