Refractory black carbon aerosols in rainwater in the summer of 2019 in Beijing: Mass concentration, size distribution and wet scavenging ratio

IF 6.9 Q1 Environmental Science
Shandong Lei , Baozhu Ge , Hang Liu , Jiannong Quan , Danhui Xu , Yuting Zhang , Weijie Yao , Lu Lei , Yu Tian , Qi Liao , Xiaoyong Liu , Jie Li , Jinyuan Xin , Yele Sun , Pingqing Fu , Junji Cao , Zifa Wang , Xiaole Pan
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引用次数: 0

Abstract

Black carbon (BC) aerosols in the atmosphere play a significant role in climate systems due to their strong ability to absorb solar radiation. The lifetime of BC depends on atmospheric transport, aging and consequently on wet scavenging processes (in-cloud and below-cloud scavenging). In this study, sequential rainwater samples in eight rainfall events collected in 2 mm interval were measured by a tandem system including a single particle soot photometer (SP2) and a nebulizer. The results showed that the volume-weighted average (VWA) mass concentrations of refractory black carbon (rBC) in each rainfall event varied, ranging from 10.8 to 78.9 µg/L. The highest rBC concentrations in the rainwater samples typically occurred in the first fraction from individual rainfall events. The geometric mean median mass-equivalent diameter (MMD) decreased under precipitation, indicating that rBC with larger sizes was relatively aged and preferentially removed by wet scavenging. A positive correlation (R2 = 0.73) between the VWA mass concentrations of rBC in rainwater and that in ambient air suggested the important contribution of scavenging process. Additionally, the contributions of in-cloud and below-cloud scavenging were distinguished and accounted for 74% and 26% to wet scavenging, respectively. The scavenging ratio of rBC particles was estimated to be 0.06 on average. This study provides helpful information for better understanding the mechanism of rBC wet scavenging and reducing the uncertainty of numerical simulations of the climate effects of rBC.

北京2019年夏季雨水中难降解黑碳气溶胶的质量浓度、粒径分布和湿清除率
大气中的黑碳气溶胶由于具有较强的吸收太阳辐射的能力,在气候系统中发挥着重要作用。BC的寿命取决于大气传输、老化,从而取决于湿清除过程(云中和云下清除)。在本研究中,通过包括单颗粒烟尘光度计(SP2)和喷雾器在内的串联系统测量了以2 mm间隔收集的8次降雨事件中的连续雨水样本。结果表明,在每次降雨事件中,难降解炭黑(rBC)的体积加权平均质量浓度各不相同,范围为10.8至78.9µg/L。雨水样本中的最高rBC浓度通常发生在单个降雨事件的第一部分。几何平均中值质量当量直径(MMD)在降水条件下降低,表明尺寸较大的rBC相对老化,优先通过湿法清除去除。雨水中rBC的VWA质量浓度与环境空气中的VWA浓度呈正相关(R2=0.73),表明清除过程的重要贡献。此外,云中清除和云下清除的贡献是不同的,分别占湿清除的74%和26%。rBC颗粒的清除率估计为平均0.06。这项研究为更好地理解rBC的湿清除机制和减少rBC气候效应数值模拟的不确定性提供了有用的信息。
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来源期刊
Journal of environmental sciences
Journal of environmental sciences Environmental Science (General)
CiteScore
12.80
自引率
0.00%
发文量
0
审稿时长
17 days
期刊介绍: Journal of Environmental Sciences is an international peer-reviewed journal established in 1989. It is sponsored by the Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, and it is jointly published by Elsevier and Science Press. It aims to foster interdisciplinary communication and promote understanding of significant environmental issues. The journal seeks to publish significant and novel research on the fate and behaviour of emerging contaminants, human impact on the environment, human exposure to environmental contaminants and their health effects, and environmental remediation and management. Original research articles, critical reviews, highlights, and perspectives of high quality are published both in print and online.
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