气候变化领域集成服务门户(CCPortal): Measurement report: On the difference in aerosol hygroscopicity between high and low relative humidity conditions in the North China Plain

CCPortal

DOI	10.5194/acp-22-4599-2022
	Measurement report: On the difference in aerosol hygroscopicity between high and low relative humidity conditions in the North China Plain
	Shi, Jingnan; Hong, Juan; Ma, Nan; Luo, Qingwei; He, Yao; Xu, Hanbing; Tan, Haobo; Wang, Qiaoqiao; Tao, Jiangchuan; Zhou, Yaqing; Han, Shuang; Peng, Long; Xie, Linhong; Zhou, Guangsheng; Xu, Wanyun; Sun, Yele; Cheng, Yafang; Su, Hang
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	4599
结束页码	4613
卷号	22 期号:7 页码:15
英文摘要	Atmospheric processes, including both primary emissions and secondary formation, may exert complex effects on aerosol hygroscopicity, which is of significant importance in understanding and quantifying the effect of aerosols on climate and human health. In order to explore the influence of local emissions and secondary formation processes on aerosol hygroscopicity, we investigated the hygroscopic properties of submicron aerosol particles at a rural site in the North China Plain (NCP) in winter 2018. This was conducted by simultaneous measurements of aerosol hygroscopicity and chemical composition, using a custom-built hygroscopic tandem differential mobility analyzer (HTDMA) and a capture-vaporizer time-of-flight aerosol chemical speciation monitor (CV-ToF-ACSM). The hygroscopicity results showed that the particles during the entire campaign were mainly externally mixed, with a more hygroscopic (MH) mode and a less hygroscopic (LH) mode. The mean hygroscopicity parameter (kappa(mean)) values derived from hygroscopicity measurements for particles at 60, 100, 150, and 200 nm were 0.16, 0.18, 0.16, and 0.15, respectively. During this study, we classified two distinct episodes with different relative humidity (RH) and temperature (T) conditions, indicative of different primary emissions and secondary formation processes. It was observed that aerosols at all measured sizes were more hygroscopic under the high-RH (HRH) episode than those under the low-RH (LRH) episode. During the LRH, kappa decreased with increasing particle size, which may be explained by the enhanced domestic heating at low temperature, causing large emissions of non-hygroscopic or less hygroscopic primary aerosols. This is particularly obvious for 200 nm particles, with a dominant number fraction (> 50 %) of LH mode particles. Using O : C-dependent hygroscopic parameters of secondary organic compounds (kappa(SOA)), closure analysis between the HTDMA-measured kappa and the ACSM-derived kappa was carried out. The results showed that kappa(SOA )under the LRH episode was less sensitive to the changes in organic oxidation level, while kappa(SOA) under HRH had a relatively stronger dependency on the organic O : C ratio. This feature suggests that the different sources and aerosol evolution processes, partly resulting from the variation in atmospheric RH and T conditions, may lead to significant changes in aerosol chemical composition, which will further influence their corresponding physical properties.
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:000779390600001
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/273339
作者单位	Jinan University; Sun Yat Sen University; China Meteorological Administration; Chinese Academy of Sciences; Institute of Atmospheric Physics, CAS; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; Chinese Academy of Sciences; Institute of Urban Environment, CAS; Chinese Academy of Meteorological Sciences (CAMS); Max Planck Society
推荐引用方式 GB/T 7714	Shi, Jingnan,Hong, Juan,Ma, Nan,et al. Measurement report: On the difference in aerosol hygroscopicity between high and low relative humidity conditions in the North China Plain[J],2022,22(7):15.
APA	Shi, Jingnan.,Hong, Juan.,Ma, Nan.,Luo, Qingwei.,He, Yao.,...&Su, Hang.(2022).Measurement report: On the difference in aerosol hygroscopicity between high and low relative humidity conditions in the North China Plain.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(7),15.
MLA	Shi, Jingnan,et al."Measurement report: On the difference in aerosol hygroscopicity between high and low relative humidity conditions in the North China Plain".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.7(2022):15.