气候变化领域集成服务门户(CCPortal): Components, acidification characteristics, and sources of atmospheric precipitation in Beijing from 1997 to 2020

CCPortal

DOI	10.1016/j.atmosenv.2021.118707
	Components, acidification characteristics, and sources of atmospheric precipitation in Beijing from 1997 to 2020
	Sun S.; Liu S.; Li L.; Zhao W.
发表日期	2021
ISSN	1352-2310
卷号	266
英文摘要	Policies such as the Air Pollution Prevention and Control Action Plan have been implemented in Beijing to address acid rain pollution. In this study, we evaluate the effects of these policies by analyzing rainfall monitoring data from 1997 to 2020, acidification characteristics, and chemical components of precipitation in Beijing. We found that precipitation pH values had significantly changed in 2008, showing an overall declining trend during 1997–2008 before gradually recovering. The frequency of acid rain was first increased and then decreased, reaching zero levels after 2017. The multi-year average pH in urban (1997–2020), suburban (1997–2020), and background (2004–2020) sites was 5.74 ± 0.67 Â, 6.53 ± 0.54 Â, and 6.49 ± 0.64 Â, respectively. The predominant cations in precipitation were NH4+ and Ca2+, where Ca2+ concentrations dropped from 332.1 μeq·L−1 in 1997 to 179.3 μeq·L−1 by 2015 and 81.39 μeq·L−1 by 2020. In contrast, NH4+ concentrations were first increased from 193.4 μeq·L−1 in 1997 to 270.5 μeq·L−1 in 2015 and then decreased to 206.78 μeq·L−1 by 2020. The concentration of the predominant anions, SO42− and NO3−, was generally decreased; SO42− concentration was decreased from 350.88 μeq·L−1 in 1999 to 88.19 μeq·L−1 in 2020. However, NO3− underwent a down-up-down trend, dropping slowly from 125.3 μeq·L−1 in 1997 to 52.2 μeq·L−1 in 2004, then significantly increasing to 173.06 μeq·L−1 in 2014 before showing a downward trend in volatility. The [SO42−]:[NO3−] ratio was gradually decreased from 3.3 in 1997 to 1.5 in 2015, then dropped to 0.9 in 2020, indicating that the type of precipitation gradually shifted from a predominantly sulfuric acid type to a more mixed type. Conversely, the [Ca2+]:[NH4+] ratio showed a decreasing trend, suggesting NH4+ as the principal neutralizing agent in recent years. The correlation coefficients among the major crustal source components (Ca2+, K+, and Mg2+) were relatively high in the precipitation, suggesting that the contribution from ground dust was significant. The major acidic anions were primarily attributed to human activities. © 2021 Elsevier Ltd
关键词	Acid rain Beijing Ions pH Precipitation
语种	英语
scopus关键词	Acidification; Air pollution; Atmospheric chemistry; Chemical analysis; Ions; pH; Pollution control; Urban growth; Action plan; Air pollution prevention; Atmospheric precipitation; Beijing; Ca 2+; Chemical component; Control actions; Mixed type; pH value; Pollution prevention and controls; Acid rain; ammonia; anion; calcium ion; cation; magnesium ion; nitrate; nitrogen oxide; potassium ion; rain; sodium ion; sulfuric acid; acid rain; acidification; correlation; monitoring; pH; precipitation (climatology); sulfuric acid; acid rain; acidification; air pollution; air sampling; Article; chemical analysis; China; correlation coefficient; environmental monitoring; particulate matter; pH; pollution control; precipitation; suburban area; urban area; Air; Beijing [China]; Niger [West Africa]
来源期刊	ATMOSPHERIC ENVIRONMENT
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/248208
作者单位	Beijing Municipal Ecological and Environmental Monitoring Center, Beijing, 100048, China; School of Resources, Environment & Tourism, Capital Normal University, Beijing, 100048, China
推荐引用方式 GB/T 7714	Sun S.,Liu S.,Li L.,et al. Components, acidification characteristics, and sources of atmospheric precipitation in Beijing from 1997 to 2020[J],2021,266.
APA	Sun S.,Liu S.,Li L.,&Zhao W..(2021).Components, acidification characteristics, and sources of atmospheric precipitation in Beijing from 1997 to 2020.ATMOSPHERIC ENVIRONMENT,266.
MLA	Sun S.,et al."Components, acidification characteristics, and sources of atmospheric precipitation in Beijing from 1997 to 2020".ATMOSPHERIC ENVIRONMENT 266(2021).