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DOI	10.5194/acp-20-1431-2020
	Characterization of aerosol particles at Cabo Verde close to sea level and at the cloud level-Part 1: Particle number size distribution, cloud condensation nuclei and their origins
	Gong X.; Wex H.; Voigtländer J.; Wadinga Fomba K.; Weinhold K.; Van Pinxteren M.; Henning S.; Müller T.; Herrmann H.; Stratmann F.
发表日期	2020
ISSN	16807316
起始页码	1431
结束页码	1449
卷号	20 期号:3
英文摘要	In the framework of the MarParCloud (Marine biological production, organic aerosol particles and marine clouds: a Process Chain) project, measurements were carried out on the islands of Cabo Verde (a.k.a. Cape Verde) to investigate the abundance, properties and sources of aerosol particles in general, and cloud condensation nuclei (CCN) in particular, both close to sea level and at the cloud level. A thorough comparison of particle number concentration (PNC), particle number size distribution (PNSD) and CCN number concentration (NCCN) at the Cape Verde Atmospheric Observatory (CVAO, sea-level station) and Monte Verde (MV, cloud-level station) reveals that during times without clouds the aerosols at CVAO and MV are similar and the boundary layer is generally well mixed. Therefore, data obtained at CVAO can be used to describe the aerosol particles at cloud level. Cloud events were observed at MV during roughly 58 % of the time, and during these events a large fraction of particles was activated to cloud droplets. A trimodal parameterization method was deployed to characterize PNC at CVAO. Based on number concentrations in different aerosol modes, four well-separable types of PNSDs were found, which were named the marine type, mixture type, dust type1 and dust type2. Aerosol particles differ depending on their origins. When the air masses came from the Atlantic Ocean, sea spray can be assumed to be one source for particles besides new particle formation. For these air masses, PNSDs featured the lowest number concentration in Aitken, accumulation and coarse modes. Particle number concentrations for sea spray aerosol (SSA, i.e., the coarse mode for these air masses) accounted for about 3.7 % of NCCN;0:30 % (CCN number concentration at 0.30 % supersaturation) and about 1.1 % to 4.4 % of Ntotal (total particle number concentration). When the air masses came from the Sahara, we observed enhanced Aitken, accumulation and coarse mode particle number concentrations and overall increased NCCN; NCCN;0:30 % during the strongest observed dust periods is about 2.5 times higher than that during marine periods. However, the particle hygroscopicity parameter for these two most different periods shows no significant difference and is generally similar, independent of air mass. Overall, averaged 0.28, suggesting the presence of organic material in particles. This is consistent with previous model work and field measurements. There is a slight increase in with increasing particle size, indicating the addition of soluble, likely inorganic, material during cloud processing. © 2020 Author(s).
语种	英语
scopus关键词	aerosol; aerosol composition; cloud condensation nucleus; concentration (composition); particle size; sea level; size distribution; Cape Verde [Macaronesia]
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/152937
作者单位	Leibniz Institute for Tropospheric Research, Leipzig, Germany
推荐引用方式 GB/T 7714	Gong X.,Wex H.,Voigtländer J.,et al. Characterization of aerosol particles at Cabo Verde close to sea level and at the cloud level-Part 1: Particle number size distribution, cloud condensation nuclei and their origins[J],2020,20(3).
APA	Gong X..,Wex H..,Voigtländer J..,Wadinga Fomba K..,Weinhold K..,...&Stratmann F..(2020).Characterization of aerosol particles at Cabo Verde close to sea level and at the cloud level-Part 1: Particle number size distribution, cloud condensation nuclei and their origins.Atmospheric Chemistry and Physics,20(3).
MLA	Gong X.,et al."Characterization of aerosol particles at Cabo Verde close to sea level and at the cloud level-Part 1: Particle number size distribution, cloud condensation nuclei and their origins".Atmospheric Chemistry and Physics 20.3(2020).