气候变化领域集成服务门户(CCPortal): Measurement report: The importance of biomass burning in light extinction and direct radiative effect of urban aerosol during the COVID-19 lockdown in Xi'an, China

CCPortal

DOI	10.5194/acp-22-8369-2022
	Measurement report: The importance of biomass burning in light extinction and direct radiative effect of urban aerosol during the COVID-19 lockdown in Xi'an, China
	Tian, Jie; Wang, Qiyuan; Liu, Huikun; Ma, Yongyong; Liu, Suixin; Zhang, Yong; Ran, Weikang; Han, Yongming; Cao, Junji
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	8369
结束页码	8384
卷号	22 期号:12 页码:16
英文摘要	Due to the complexity of emission sources, a better understanding of aerosol optical properties is required to mitigate climate change in China. Here, an intensive real-time measurement campaign was conducted in an urban area of China before and during the COVID-19 lockdown in order to explore the impacts of anthropogenic activities on aerosol light extinction and the direct radiative effect (DRE). The mean light extinction coefficient ( bext) decreased from 774.7 +/- 298.1Mm(-1) during the normal period to 544.3 +/- 179.4Mm(-1) during the lockdown period. A generalised additive model analysis indicated that the large decline in bext (29.7 %) was due to sharp reductions in anthropogenic emissions. Chemical calculation of bext based on a ridge regression analysis showed that organic aerosol (OA) was the largest contributor to bext in both periods (45.1 %-61.4 %), and the contributions of two oxygenated OAs to bext increased by 3.0 %-14.6% during the lockdown. A hybrid environmental receptor model combined with chemical and optical variables identified six sources of bext. It was found that bext from traffic-related emissions, coal combustion, fugitive dust, the nitrate and secondary OA (SOA) source, and the sulfate and SOA source decreased by 21.4 %-97.9% in the lockdown, whereas bext from biomass burning increased by 27.1 %, mainly driven by the undiminished need for residential cooking and heating. An atmospheric radiative transfer model was further used to illustrate that biomass burning, rather than traffic-related emissions, became the largest positive effect (10.0 +/- 10.9Wm(-2)) on aerosol DRE in the atmosphere during the lockdown. Our study provides insights into aerosol bext and DRE from anthropogenic sources, and the results imply the importance of controlling biomass burning for tackling climate change in China in the future.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000818951400001
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/273886
作者单位	Chinese Academy of Sciences; Institute of Earth Environment, CAS; Chinese Academy of Sciences; Institute of Atmospheric Physics, CAS
推荐引用方式 GB/T 7714	Tian, Jie,Wang, Qiyuan,Liu, Huikun,et al. Measurement report: The importance of biomass burning in light extinction and direct radiative effect of urban aerosol during the COVID-19 lockdown in Xi'an, China[J],2022,22(12):16.
APA	Tian, Jie.,Wang, Qiyuan.,Liu, Huikun.,Ma, Yongyong.,Liu, Suixin.,...&Cao, Junji.(2022).Measurement report: The importance of biomass burning in light extinction and direct radiative effect of urban aerosol during the COVID-19 lockdown in Xi'an, China.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(12),16.
MLA	Tian, Jie,et al."Measurement report: The importance of biomass burning in light extinction and direct radiative effect of urban aerosol during the COVID-19 lockdown in Xi'an, China".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.12(2022):16.