气候变化领域集成服务门户(CCPortal): Multi-method determination of the below-cloud wet scavenging coefficients of aerosols in Beijing; China

CCPortal

DOI	10.5194/acp-19-15569-2019
	Multi-method determination of the below-cloud wet scavenging coefficients of aerosols in Beijing; China
	Xu D.; Ge B.; Chen X.; Sun Y.; Cheng N.; Li M.; Pan X.; Ma Z.; Pan Y.; Wang Z.
发表日期	2019
ISSN	16807316
起始页码	15569
结束页码	15581
卷号	19 期号:24
英文摘要	Wet scavenging is one of the most efficient processes for removing aerosols from the atmosphere. This process is not well constrained in chemical transport models (CTMs) due to a paucity of localized parameterization regarding the below-cloud wet scavenging coefficient (BWSC). Here we conducted field measurements of the BWSC during the Atmospheric Pollution and Human Health Beijing (APHH-Beijing) campaign of 2016. Notably, the observed BWSC values based on the updated aerosol mass balance agree well with another estimation technique, and they fall in a range of 10-5 s-1. The measurement in this winter campaign, combined with that in summer of 2014, supported an exponential power distribution of BWSCs with rainfall intensity. The observed parameters were also compared with both the theoretical calculations and modeling results. We found that the theoretical estimations can effectively characterize the observed BWSCs of aerosols with sizes smaller than 0.2 μ m and larger than 2.5 μ m. However, the theoretical estimations were an order of magnitude lower than observed BWSCs within 0.2-2.5 μ m, a domain size range of urban aerosols. Such an underestimation of BWSC through a theoretical method has been confirmed not only in APHHBeijing campaign but also in all the rainfall events in summer of 2014. Since the model calculations usually originated from the theoretical estimations with simplified scheme, the significantly lower BWSC could well explain the underprediction of wet depositions in polluted regions as reported by the Model Inter-Comparison Study for Asia (MICS-Asia) and the global assessment of the Task Force on Hemispheric Transport of Atmospheric Pollutants (TF-HTAP). The findings highlighted that the wet deposition module in the CTMs requires improvement based on field measurement estimation to construct a more reasonable simulation scheme for BWSC, especially in polluted regions. © 2019 Author(s).
语种	英语
scopus关键词	aerosol; atmospheric modeling; atmospheric pollution; mass balance; measurement method; parameterization; scavenging (chemistry); wet deposition; Beijing [China]; China
来源期刊	Atmospheric Chemistry and Physics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/143953
作者单位	State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China; College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China; Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China; Beijing Municipal Environmental Monitoring Center, Beijing, 100048, China; Institute of Mass Spectrometer and Atmospheric Environment, Jinan University, Guangzhou, 510632, China; Guangdong Prov. Engineering Research Center for Online Source Apportionment System of Air Pollution, Guangzhou, 510632, China; Beijing Shangdianzi Regional Atmosphere Watch Station, Beijing, 100089, China
推荐引用方式 GB/T 7714	Xu D.,Ge B.,Chen X.,et al. Multi-method determination of the below-cloud wet scavenging coefficients of aerosols in Beijing; China[J],2019,19(24).
APA	Xu D..,Ge B..,Chen X..,Sun Y..,Cheng N..,...&Wang Z..(2019).Multi-method determination of the below-cloud wet scavenging coefficients of aerosols in Beijing; China.Atmospheric Chemistry and Physics,19(24).
MLA	Xu D.,et al."Multi-method determination of the below-cloud wet scavenging coefficients of aerosols in Beijing; China".Atmospheric Chemistry and Physics 19.24(2019).