Quantification of secondary particle loading during a heavy air pollution event in Beijing: A simplified method based on coal emission indicators
Quantification of secondary particle loading during a heavy air pollution event in Beijing: A simplified method based on coal emission indicators
复制标题
北京一次空气重污染事件期间二次颗粒物负荷量化：基于煤炭排放指标的简化方法
DOI：
10.1016/j.atmosenv.2019.116896
复制
发表时间：
2019
影响因子：
5
通讯作者：
ou Xu
中科院分区：
文献类型：
--
作者：
Jie Ouyang;Lijuan Song;Lingling Ma;Min Luo;Xiongxin Dai;Jintao Zhang;Di;ou Xu
二次气溶胶（SA）被认为是一种越来越危险的空气污染物。然而，SA的定量由于其形成机制知之甚少而具有相当大的不确定性。在这项研究中，一个简化的方法的基础上，表征燃煤排放指标钋-210（210 Po），硒（Se）和砷（As）的估计SA负荷（增量）在2016年12月在北京的空气重污染事件。由于本次重污染过程中大气污染物的输入和输出均不显著，且假设污染物为非本地排放，因此提出了一种稳态重污染方法来估算本次典型重污染过程中的SA增量（新形成的二次无机气溶胶和二次有机气溶胶之和）。根据燃煤污染物（~（210）Po、Se、As）的特点，提出了相应的算法。结果表明，本次重污染过程中，新形成的悬浮颗粒物对总悬浮颗粒物（TSP）的贡献中值为42.4%（四分位距：36.6%~ 48.8%），定量地证实了悬浮颗粒物的显著增强对重污染的贡献占主导地位。虽然还需要进一步的验证，这种稳定状态的方法来评估严重的空气污染的SA增量的量化是有潜力的。
Secondary aerosol (SA) is considered to be an increasingly dangerous air pollutant. However, quantification of SA has suffered from considerable uncertainty due to its poorly understood formation mechanism. In this study, a simplified approach based on characterizing coal combustion emission indicators polonium-210 (210Po), selenium (Se) and arsenic (As) was used to estimate SA loading (increment) during a heavy air pollution event in December 2016 in Beijing. Due to the insignificant input and output of air pollutants as well as the assumption of non-local emissions during this heavy air pollution event, a steady-state method of severe air pollution has been proposed to estimate SA increment (the sum of newly formed secondary inorganic aerosols and secondary organic aerosols) during this typical air pollution event. Corresponding algorithm of the method was developed depending on the characteristics of coal combustion related pollutants (210Po, Se, and As). The results indicated that the median contribution of newly formed SA to total suspended particulates (TSP) during this heavy air pollution event was 42.4% (interquartile range [IQR]: 36.6%–48.8%), which quantitatively confirms the dominant contribution of substantial enhancement of SA to heavy air pollution. Although further verification is needed, this steady-state method of evaluating severe air pollution has potential for quantification of the SA increment.