气候变化领域集成服务门户(CCPortal): The impact of aerosol size-dependent hygroscopicity and mixing state on the cloud condensation nuclei potential over the north-east Atlantic

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DOI	10.5194/acp-21-8655-2021
	The impact of aerosol size-dependent hygroscopicity and mixing state on the cloud condensation nuclei potential over the north-east Atlantic
	Xu W.; Fossum K.N.; Ovadnevaite J.; Lin C.; Huang R.-J.; O'Dowd C.; Ceburnis D.
发表日期	2021
ISSN	1680-7316
起始页码	8655
结束页码	8675
卷号	21 期号:11
英文摘要	We present an aerosol cloud condensation nuclei (CCN) closure study over the north-east Atlantic Ocean using six approximating methods. The CCN number concentrations (N CCN) were measured at four discrete supersaturations (SSs; 0.25 %, 0.5 %, 0.75 % and 1.0 %). Concurrently, aerosol number size distribution, sub-saturation hygroscopic growth factor and bulk PM 1 chemical composition were obtained at matching time resolution and after a careful data validation exercise. Method A used a constant bulk hygroscopicity parameter κ of 0.3; method B used bulk PM 1 chemical composition measured by an aerosol mass spectrometer (AMS); method C utilised a single growth factor (GF) size (165 nm) measured by a humidified tandem differential mobility analyser (HTDMA); method D utilised size-dependent GFs measured at 35, 50, 75, 110 and 165 nm; method E divided the aerosol population into three hygroscopicity modes (near-hydrophobic, more-hygroscopic and sea-salt modes), and the total CCN number in each mode was cumulatively added up; method F used the full-size-scale GF probability density function (GF-PDF) in the most complex approach. The studied periods included high-biological-activity and low-biological-activity seasons in clean marine and polluted continental air masses to represent and discuss the most contrasting aerosol populations. Overall, a good agreement was found between estimated and measured N CCN with linear regression slopes ranging from 0.64 to 1.6. The temporal variability was captured very well, with Pearson's R value ranging from 0.76 to 0.98 depending on the method and air mass type. We further compared the results of using different methods to quantify the impact of size-dependent hygroscopicity and mixing state and found that ignoring size-dependent hygroscopicity induced overestimation of N CCN by up to 12 %, and ignoring a mixing state induced overestimation of N CCN by up to 15 %. The error induced by assuming an internal mixing in highly polluted cases was largely eliminated by dividing the full GF-PDF into three conventional hygroscopic modes, while assuming an internal mixing in clean marine aerosol did not induce significant error. © 2021 Wei Xu et al.
语种	英语
scopus关键词	aerosol; chemical composition; cloud condensation nucleus; hygroscopicity; mass spectrometry; mixing; particle size; probability density function; supersaturation; temporal variation; Atlantic Ocean; Atlantic Ocean (Northwest)
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/246829
作者单位	School of Physics, Ryan Institute's Centre for Climate and Air Pollution Studies, National University of Ireland Galway, Galway, Ireland; State Key Laboratory of Loess and Quaternary Geology, Key Laboratory of Aerosol Chemistry and Physics, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, China
推荐引用方式 GB/T 7714	Xu W.,Fossum K.N.,Ovadnevaite J.,et al. The impact of aerosol size-dependent hygroscopicity and mixing state on the cloud condensation nuclei potential over the north-east Atlantic[J],2021,21(11).
APA	Xu W..,Fossum K.N..,Ovadnevaite J..,Lin C..,Huang R.-J..,...&Ceburnis D..(2021).The impact of aerosol size-dependent hygroscopicity and mixing state on the cloud condensation nuclei potential over the north-east Atlantic.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(11).
MLA	Xu W.,et al."The impact of aerosol size-dependent hygroscopicity and mixing state on the cloud condensation nuclei potential over the north-east Atlantic".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.11(2021).