气候变化领域集成服务门户(CCPortal): Analysis of the Influencing Factors and Sources of Brown Carbon Light Absorption in a Typical Megacity of the Yangtze River Delta, China

CCPortal

DOI	10.3390/atmos15040421
	Analysis of the Influencing Factors and Sources of Brown Carbon Light Absorption in a Typical Megacity of the Yangtze River Delta, China
	Xu, Shanshu; Wang, Junfeng; Li, Yue'e; Zhang, Ning; Ge, Xinlei; Aruffo, Eleonora
发表日期	2024
EISSN	2073-4433
起始页码	15
结束页码	4
卷号	15 期号:4
英文摘要	Brown carbon (BrC) is a new term for organic aerosol (OA) with strong absorption ability from the visible to ultraviolet (UV) wavelengths, which plays a vital role in atmospheric visibility and climate change. Herein, we report field measurements from 1 March 2020 to 28 February 2021, sampled at urban Suzhou, Yangtze River Delta (YRD), China, to investigate the optical properties and sources of BrC. By analyzing the seasonal characteristics of the absorption of BrC at 370 nm (b(abs370)), b(abs370) was found to be the highest (9.0 +/- 7.2 Mm(-1)) in winter and the lowest (5.1 +/- 3.3 Mm(-1)) in summer, respectively. The absorption & Aring;ngstr & ouml;m exponent (AAE) value of BrC in winter was 1.22 +/- 0.05, followed by 1.21 +/- 0.05, 1.20 +/- 0.05, and 1.19 +/- 0.05 for fall, spring, and summer, respectively. The mass absorption cross-section (MAC) of secondary organic carbon (SOC) was 3.3 +/- 0.2 m(2)g(-1) in spring, 2.9 +/- 0.1 m(2)g(-1) in summer, 4.3 +/- 0.1 m(2)g(-1) in fall, and 2.8 +/- 0.2 m(2)g(-1) in winter, significantly lower than that of primary organic carbon (POC) at 370 nm, suggesting the aging process could weaken the light absorption of BrC. Five different BrC factors were identified by the positive matrix factorization (PMF) analysis, including biomass-burning-related, vehicle-related, sulfate-related, nitrate-related, and dust-related factors, which on average account for 7.4%, 73.4%, 11.9%, 1.9%, and 5.4% of b(abs370), respectively. Potential Source Contribution Factor (PSCF) analysis showed that those high b(abs370) periods were mainly contributed by air mass from the south. Moreover, for the influence degree of the potential source areas, the sequence was winter > spring > fall > summer. Our results improve the understanding of BrC in an important industrial city in YRD, which could reduce the uncertainty of the prediction of its climate effect in this region.
英文关键词	brown carbon; field measurements; the Yangtze River Delta; optical properties; source apportionment
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS类目	Environmental Sciences ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:001211405000001
来源期刊	ATMOSPHERE
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/305469
作者单位	Nanjing University of Information Science & Technology; G d'Annunzio University of Chieti-Pescara
推荐引用方式 GB/T 7714	Xu, Shanshu,Wang, Junfeng,Li, Yue'e,et al. Analysis of the Influencing Factors and Sources of Brown Carbon Light Absorption in a Typical Megacity of the Yangtze River Delta, China[J],2024,15(4).
APA	Xu, Shanshu,Wang, Junfeng,Li, Yue'e,Zhang, Ning,Ge, Xinlei,&Aruffo, Eleonora.(2024).Analysis of the Influencing Factors and Sources of Brown Carbon Light Absorption in a Typical Megacity of the Yangtze River Delta, China.ATMOSPHERE,15(4).
MLA	Xu, Shanshu,et al."Analysis of the Influencing Factors and Sources of Brown Carbon Light Absorption in a Typical Megacity of the Yangtze River Delta, China".ATMOSPHERE 15.4(2024).