气候变化领域集成服务门户(CCPortal): Characterizing the hygroscopicity of growing particles in the Canadian Arctic summer

CCPortal

DOI	10.5194/acp-22-8059-2022
	Characterizing the hygroscopicity of growing particles in the Canadian Arctic summer
	Chang, Rachel Y-W; Abbatt, Jonathan P. D.; Boyer, Matthew C.; Chaubey, Jai Prakash; Collins, Douglas B.
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	8059
结束页码	8071
卷号	22 期号:12 页码:13
英文摘要	The impact of aerosols on clouds is a well-studied, although still poorly constrained, part of the atmospheric system. New particle formation (NPF) is thought to contribute 40 %-80 % of the global cloud droplet number concentration, although it is extremely difficult to observe an air mass from NPF to cloud formation. NPF and growth occurs frequently in the Canadian Arctic summer atmosphere, although only a few studies have characterized the source and properties of these aerosols. This study presents cloud condensation nuclei (CCN) concentrations measured on board the CCGS Amundsen in the eastern Canadian Arctic Archipelago from 23 July to 23 August 2016 as part of the Network on Climate and Aerosols: Addressing Uncertainties in Remote Canadian Environments (NETCARE). The study was dominated by frequent ultrafine particle and/or growth events, and particles smaller than 100 nm dominated the size distribution for 92 % of the study period. Using kappa-Kohler theory and aerosol size distributions, the mean hygroscopicity parameter (kappa) calculated for the entire study was 0.12 (0.06-0.12, 25th-75th percentile), suggesting that the condensable vapours that led to particle growth were primarily slightly hygroscopic, which we infer to be organic. Based on past measurement and modelling studies from NETCARE and the Canadian Arctic, it seems likely that the source of these slightly hygroscopic, organic, vapours is the ocean. Examining specific growth events suggests that the mode diameter (D-max) had to exceed 40 nm before CCN concentrations at 0.99 % supersaturation (SS) started to increase, although a statistical analysis shows that CCN concentrations increased 13-274 cm(-3) during all ultrafine particle and/or growth times (total particle concentrations > 500 cm(-3 ), D-max < 100 nm) compared with background times (total concentrations < 500 cm(-3)) at SS of 0.26 %-0.99 %. This value increased to 25-425 cm(-3) if the growth times were limited to times when D-max was also larger than 40 nm. These results support past results from NETCARE by showing that the frequently observed ultrafine particle and growth events are dominated by a slightly hygroscopic fraction, which we interpret to be organic vapours originating from the ocean, and that these growing particles can increase the background CCN concentrations at SS as low as 0.26 %, thus pointing to their potential contribution to cloud properties and thus climate through the radiation balance.
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:000814091800001
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/273230
作者单位	Dalhousie University; University of Toronto; University of Helsinki; Bucknell University
推荐引用方式 GB/T 7714	Chang, Rachel Y-W,Abbatt, Jonathan P. D.,Boyer, Matthew C.,et al. Characterizing the hygroscopicity of growing particles in the Canadian Arctic summer[J],2022,22(12):13.
APA	Chang, Rachel Y-W,Abbatt, Jonathan P. D.,Boyer, Matthew C.,Chaubey, Jai Prakash,&Collins, Douglas B..(2022).Characterizing the hygroscopicity of growing particles in the Canadian Arctic summer.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(12),13.
MLA	Chang, Rachel Y-W,et al."Characterizing the hygroscopicity of growing particles in the Canadian Arctic summer".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.12(2022):13.