气候变化领域集成服务门户(CCPortal): Measurement report: Characterisation and sources of the secondary organic carbon in a Chinese megacity over 5 years from 2016 to 2020

CCPortal

DOI	10.5194/acp-22-12789-2022
	Measurement report: Characterisation and sources of the secondary organic carbon in a Chinese megacity over 5 years from 2016 to 2020
	Wang, Meng; Duan, Yusen; Xu, Wei; Wang, Qiyuan; Zhang, Zhuozhi; Yuan, Qi; Li, Xinwei; Han, Shuwen; Tong, Haijie; Huo, Juntao; Chen, Jia; Gao, Shan; Wu, Zhongbiao; Cui, Long; Huang, Yu; Xiu, Guangli; Cao, Junji; Fu, Qingyan; Lee, Shun-cheng
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	12789
结束页码	12802
卷号	22 期号:19 页码:14
英文摘要	To investigate impact factors and source area of secondary organic aerosols in the Yangtze River Delta (YRD) region, a world-class urban agglomeration in China, long-term measurements of organic carbon (OC) and elementary carbon (EC) in particulate matter of less than 2.5 mu m (PM2.5) with hourly time resolution were conducted at a regional site in Shanghai from 2016 to 2020. Based on the 5-year measurements, the interannual, monthly, seasonal, and diurnal variations in OC and EC, as well as OC subtypes, i.e. secondary OC (SOC) and primary OC (POC), apportioned by the novel statistical model of the minimum R-2 method, and the formation pathways of SOC, are presented. By examining the relationship between SOC and temperature, as well as relative humidity (RH), we show that SOC formation is greatly enhanced at high temperatures (> 30 degrees C), whereas it correlates inversely with RH. In particular, we show that the photochemical formation of SOC is the major formation pathway even in winter, when solar radiation was supposedly less intense than in summer, which is different from that in the north China plain, where aqueous phase chemistry is found to be an important SOC formation pathway. Moreover, increased SOC concentrations are also found to be associated with high wind speed (> 5ms(-1)) in winter, which is increased by 29.1% (2.62 mu gm(-3)) when compared with that during lower winds, suggesting regional sources of SOC in winter. By analysing the potential source regions using the concentration-weighted trajectory (CWT), the geographic regions of SOC are found to be mainly associated with transport from outside Shanghai (SOC > 3.5 mu gm(-3)) including central and southern Anhui, Zhejiang, and Fujian. The results from this study provide critical information about the long-term trend of carbonaceous aerosol, in particular, SOC, in one of the largest megacities in the world, and are helpful for developing pollution control measures from a long-term planning perspective.
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:000861798600001
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/273419
作者单位	Hong Kong Polytechnic University; Chinese Academy of Sciences; Institute of Earth Environment, CAS; Zhejiang University; East China University of Science & Technology; Chinese Academy of Sciences; Institute of Atmospheric Physics, CAS
推荐引用方式 GB/T 7714	Wang, Meng,Duan, Yusen,Xu, Wei,et al. Measurement report: Characterisation and sources of the secondary organic carbon in a Chinese megacity over 5 years from 2016 to 2020[J],2022,22(19):14.
APA	Wang, Meng.,Duan, Yusen.,Xu, Wei.,Wang, Qiyuan.,Zhang, Zhuozhi.,...&Lee, Shun-cheng.(2022).Measurement report: Characterisation and sources of the secondary organic carbon in a Chinese megacity over 5 years from 2016 to 2020.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(19),14.
MLA	Wang, Meng,et al."Measurement report: Characterisation and sources of the secondary organic carbon in a Chinese megacity over 5 years from 2016 to 2020".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.19(2022):14.