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DOI	10.5194/acp-22-5725-2022
	High number concentrations of transparent exopolymer particles in ambient aerosol particles and cloud water - a case study at the tropical Atlantic Ocean
	van Pinxteren, Manuela; Robinson, Tiera-Brandy; Zeppenfeld, Sebastian; Gong, Xianda; Bahlmann, Enno; Fomba, Khanneh Wadinga; Triesch, Nadja; Stratmann, Frank; Wurl, Oliver; Engel, Anja; Wex, Heike; Herrmann, Hartmut
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	5725
结束页码	5742
卷号	22 期号:8 页码:18
英文摘要	Transparent exopolymer particles (TEPs) exhibit the properties of gels and are ubiquitously found in the world oceans. TEPs may enter the atmosphere as part of sea-spray aerosol. Here, we report number concentrations of TEPs with a diameter > 4.5 mu m, hence covering a part of the supermicron particle range, in ambient aerosol and cloud water samples from the tropical Atlantic Ocean as well as in generated aerosol particles using a plunging waterfall tank that was filled with the ambient seawater. The ambient TEP concentrations ranged between 7 x 10(2) and 3 x 10(4) #TEP m(-3) in the aerosol particles and correlations with sodium (Na+) and calcium (Ca2+) (R-2 = 0.5) suggested some contribution via bubble bursting. Cloud water TEP concentrations were between 4 x 10(6) and 9 x 10(6) #TEP L-1 and, according to the measured cloud liquid water content, corresponding to equivalent air concentrations of 2-4 x 10(3) #TEP m(-3). Based on Na+ concentrations in seawater and in the atmosphere, the enrichment factors for TEPs in the atmosphere were calculated. The tank-generated TEPs were enriched by a factor of 50 compared with seawater and, therefore, in-line with published enrichment factors for supermicron organic matter in general and TEPs specifically. TEP enrichment in the ambient atmosphere was on average 1 x 10(3) in cloud water and 9 x 10(3) in ambient aerosol particles and therefore about two orders of magnitude higher than the corresponding enrichment from the tank study. Such high enrichment of supermicron particulate organic constituents in the atmosphere is uncommon and we propose that atmospheric TEP concentrations resulted from a combination of enrichment during bubble bursting transfer from the ocean and a secondary TEP in-situ formation in atmospheric phases. Abiotic in-situ formation might have occurred from aqueous reactions of dissolved organic precursors that were present in particle and cloud water samples, whereas biotic formation involves bacteria, which were abundant in the cloud water samples. The ambient TEP number concentrations were two orders of magnitude higher than recently reported ice nucleating particle (INP) concentrations measured at the same location. As TEPs likely possess good properties to act as INPs, in future experiments it is worth studying if a certain part of TEPs contributes a fraction of the biogenic INP population.
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:000789478900001
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/273742
作者单位	Leibniz Institut fur Tropospharenforschung (TROPOS); Carl von Ossietzky Universitat Oldenburg; Leibniz Institut fur Tropospharenforschung (TROPOS); Leibniz Zentrum fur Marine Tropenforschung (ZMT); Helmholtz Association; GEOMAR Helmholtz Center for Ocean Research Kiel; Washington University (WUSTL)
推荐引用方式 GB/T 7714	van Pinxteren, Manuela,Robinson, Tiera-Brandy,Zeppenfeld, Sebastian,et al. High number concentrations of transparent exopolymer particles in ambient aerosol particles and cloud water - a case study at the tropical Atlantic Ocean[J],2022,22(8):18.
APA	van Pinxteren, Manuela.,Robinson, Tiera-Brandy.,Zeppenfeld, Sebastian.,Gong, Xianda.,Bahlmann, Enno.,...&Herrmann, Hartmut.(2022).High number concentrations of transparent exopolymer particles in ambient aerosol particles and cloud water - a case study at the tropical Atlantic Ocean.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(8),18.
MLA	van Pinxteren, Manuela,et al."High number concentrations of transparent exopolymer particles in ambient aerosol particles and cloud water - a case study at the tropical Atlantic Ocean".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.8(2022):18.