气候变化领域集成服务门户(CCPortal): Circum-Antarctic abundance and properties of CCN and INPs

CCPortal

DOI	10.5194/acp-22-9721-2022
	Circum-Antarctic abundance and properties of CCN and INPs
	Tatzelt, Christian; Henning, Silvia; Welti, Andre; Baccarini, Andrea; Hartmann, Markus; Gysel-Beer, Martin; van Pinxteren, Manuela; Modini, Robin L.; Schmale, Julia; Stratmann, Frank
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	9721
结束页码	9745
卷号	22 期号:14 页码:25
英文摘要	Aerosol particles acting as cloud condensation nuclei (CCN) or ice-nucleating particles (INPs) play a major role in the formation and glaciation of clouds. Thereby they exert a strong impact on the radiation budget of the Earth. Data on abundance and properties of both types of particles are sparse, especially for remote areas of the world, such as the Southern Ocean (SO). In this work, we present unique results from ship-borne aerosol-particle-related in situ measurements and filter sampling in the SO region, carried out during the Antarctic Circumnavigation Expedition (ACE) in the austral summer of 2016-2017. An overview of CCN and INP concentrations over the Southern Ocean is provided and, using additional quantities, insights regarding possible CCN and INP sources and origins are presented. CCN number concentrations spanned 2 orders of magnitude, e.g. for a supersaturation of 0.3% values ranged roughly from 3 to 590 cm(-3). CCN showed variable contributions of organic and inorganic material (inter-quartile range of hygroscopicity parameter kappa from 0.2 to 0.9). No distinct size dependence of kappa was apparent, indicating homogeneous composition across sizes (critical dry diameter on average between 30 and 110 nm). The contribution of sea spray aerosol (SSA) to the CCN number concentration was on average small. Ambient INP number concentrations were measured in the temperature range from -5 to -27 degrees C using an immersion freezing method. Concentrations spanned up to 3 orders of magnitude, e.g. at -16 degrees C from 0.2 to 100 m(-3). Elevated values (above 10 m(-3) at 16 degrees C) were measured when the research vessel was in the vicinity of land (excluding Antarctica), with lower and more constant concentrations when at sea. This, along with results of backward-trajectory analyses, hints towards terrestrial and/or coastal INP sources being dominant close to ice-free (non-Antarctic) land. In pristine marine areas INPs may originate from both oceanic sources and/or long-range transport. Sampled aerosol particles (PM10) were analysed for sodium and methanesulfonic acid (MSA). Resulting mass concentrations were used as tracers for primary marine and secondary aerosol particles, respectively. Sodium, with an average mass concentration around 2.8 mu gm(-3), was found to dominate the sampled, identified particle mass. MSA was highly variable over the SO, with mass concentrations up to 0.5 mu g m(-3) near the sea ice edge. A correlation analysis yielded strong correlations between sodium mass concentration and particle number concentration in the coarse mode, unsurprisingly indicating a significant contribution of SSA to that mode. CCN number concentration was highly correlated with the number concentration of Aitken and accumulation mode particles. This, together with a lack of correlation between sodium mass and Aitken and accumulation mode number concentrations, underlines the important contribution of non-SSA, probably secondarily formed particles, to the CCN population. INP number concentrations did not significantly correlate with any other measured aerosol physico-chemical parameter.
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:000832641400001
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/273923
作者单位	Leibniz Institut fur Tropospharenforschung (TROPOS); Finnish Meteorological Institute; Swiss Federal Institutes of Technology Domain; Ecole Polytechnique Federale de Lausanne; Swiss Federal Institutes of Technology Domain; Paul Scherrer Institute; University of Gothenburg
推荐引用方式 GB/T 7714	Tatzelt, Christian,Henning, Silvia,Welti, Andre,et al. Circum-Antarctic abundance and properties of CCN and INPs[J],2022,22(14):25.
APA	Tatzelt, Christian.,Henning, Silvia.,Welti, Andre.,Baccarini, Andrea.,Hartmann, Markus.,...&Stratmann, Frank.(2022).Circum-Antarctic abundance and properties of CCN and INPs.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(14),25.
MLA	Tatzelt, Christian,et al."Circum-Antarctic abundance and properties of CCN and INPs".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.14(2022):25.