气候变化领域集成服务门户(CCPortal): Measurement report: Intensive biomass burning emissions and rapid nitrateformation drive severe haze formation in the Sichuan Basin, China

CCPortal

DOI	10.5194/acp-23-1147-2023
	Measurement report: Intensive biomass burning emissions and rapid nitrateformation drive severe haze formation in the Sichuan Basin, China - insights fromaerosol mass spectrometry
	Bao, Zhier; Zhang, Xinyi; Li, Qing; Zhou, Jiawei; Shi, Guangming; Zhou, Li; Yang, Fumo; Xie, Shaodong; Zhang, Dan; Zhai, Chongzhi; Li, Zhenliang; Peng, Chao; Chen, Yang
发表日期	2023
ISSN	1680-7316
EISSN	1680-7324
起始页码	1147
结束页码	1167
卷号	23 期号:2 页码:21
英文摘要	Haze pollution is a severe environmental problem, caused by elevation of fine particles (aerodynamic diameter < 2.5 mu m, PM2.5), which is related to secondary aerosol formation, unfavourable synoptic conditions and regional transport, etc. The regional haze formation in basin areas, along with intensive emission of precursors, high relative humidity and poor dispersion conditions, is still limitedly understood. In this study, a field campaign was conducted to investigate the factors resulting in haze formation in the Sichuan Basin (SCB) during winter in 2021. The fine aerosol chemical composition was characterised using a time-of-flight aerosol chemical speciation monitor (ToF-ACSM), which also provided detailed information on the sources for organic aerosols (OAs). The average concentration of non-refractory fine particles (NR-PM2.5) was 98.5 & PLUSMN;38.7 mu gm-3, and organics aerosols, nitrate, sulfate, ammonium and chloride took up 40.3 %, 28.8 %, 10.6 %, 15.3 % and 5.1 % of PM2.5. Three factors, including a hydrocarbon-like OA (HOA), a biomass burning OA (BBOA) and an oxygenated OA (OOA), were identified by applying the positive matrix factorisation (PMF) analysis, and they constituted 24.2 %, 24.2 % and 51.6 % of OA on average, respectively. Nitrate formation was promoted by gas-phase and aqueous-phase oxidation, while sulfate was mainly formed through aqueous-phase process. OOA showed strong dependence on Ox, demonstrating the contribution of photooxidation to OOA formation. OOA concentration increased as aerosol liquid water content (ALWC) increased within 200 mu gm-3 and kept relatively constant when ALWC > 200 mu gm-3, suggesting the insignificant effect of aqueous-phase reactions on OOA formation. Among the three haze episodes identified during the whole campaign, the driving factors were different: the first haze episode (H1) was driven by nitrate formation through photochemical and aqueous-phase reactions, and the second haze episode (H2) was mainly driven by the intense emission of primary organic aerosols from biomass burning and vehicle exhaust, while the third haze episode (H3) was mainly driven by reactions involving nitrate formation and biomass burning emission. HOA and BBOA were scavenged, while OOA, nitrate and sulfate formation was enhanced by aqueous-phase reactions during fog periods, which resulted in the increase of O:C from pre-fog to post-fog periods. This study revealed the factors driving severe haze formation in the SCB and implied the benefit of controlling nitrate as well as intense biomass burning and vehicle exhaust emission for the mitigation of heavy aerosol pollution in this region.
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:000921376800001
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/273135
作者单位	Chinese Academy of Sciences; Chongqing Institute of Green & Intelligent Technology, CAS; Sichuan University; Peking University; Peking University; Chinese Academy of Sciences; Chongqing Institute of Green & Intelligent Technology, CAS
推荐引用方式 GB/T 7714	Bao, Zhier,Zhang, Xinyi,Li, Qing,et al. Measurement report: Intensive biomass burning emissions and rapid nitrateformation drive severe haze formation in the Sichuan Basin, China - insights fromaerosol mass spectrometry[J],2023,23(2):21.
APA	Bao, Zhier.,Zhang, Xinyi.,Li, Qing.,Zhou, Jiawei.,Shi, Guangming.,...&Chen, Yang.(2023).Measurement report: Intensive biomass burning emissions and rapid nitrateformation drive severe haze formation in the Sichuan Basin, China - insights fromaerosol mass spectrometry.ATMOSPHERIC CHEMISTRY AND PHYSICS,23(2),21.
MLA	Bao, Zhier,et al."Measurement report: Intensive biomass burning emissions and rapid nitrateformation drive severe haze formation in the Sichuan Basin, China - insights fromaerosol mass spectrometry".ATMOSPHERIC CHEMISTRY AND PHYSICS 23.2(2023):21.