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DOI	10.1016/j.atmosres.2020.104911
	On the regional aspects of new particle formation in the Eastern Mediterranean: A comparative study between a background and an urban site based on long term observations
	Kalkavouras P.; Bougiatioti A.; Grivas G.; Stavroulas I.; Kalivitis N.; Liakakou E.; Gerasopoulos E.; Pilinis C.; Mihalopoulos N.
发表日期	2020
ISSN	0169-8095
卷号	239
英文摘要	Atmospheric new particle formation (NPF) is an important source of submicron particles. In remote background environments where local sources are scarce such processes may impact significantly on climate-relevant parameters. On the other hand, in urban environments, newly-formed particles are adding up to submicron particles emitted from primary sources. As the exact mechanism which triggers NPF still remains elusive, so are the circumstances for simultaneous occurrence of such events in two different environments (urban vs. regional background). In this study, concurrent number size distribution measurements were conducted in the urban environment of Athens and at the regional background site of Finokalia, Crete, located 340 km away and spanning a 2-year period. It occurred that the relative frequency of NPF was similar at both sites (around 20%), with a higher frequency during spring and autumn at the urban site, while at the background site most events took place in August and December, during the studied period. There were 35 event days when NPF took place at both sites simultaneously, all associated with air masses originating from the Northern sector, indicating the presence of regional events in the extended geographical area and characterized by low condensation sink (CS). By comparing the common with the non-common class I NPF episodes, we conclude that the conditions applying when regional NPF events with growth are observed in the same day at the surface level of both areas, are: (i) lower CS, (ii) higher SO2 concentrations, (iii) lower RH, and finally (iv) lower formation and growth rates than those observed during the site-specific and more rapidly evolving NPF events. © 2020 Elsevier B.V.
关键词	Size distribution Athens Background environment Concurrent regional events Eastern Mediterranean Long term observations New particle formation Number size distribution Particle number concentration Urban growth aerosol composition aerosol formation air mass comparative study concentration (composition)parameter estimation particulate matter size distribution Aegean Islands Athens [Attica]Attica Crete [Greece]Finokalia Greece Lasithi
语种	英语
来源机构	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/132496
推荐引用方式 GB/T 7714	Kalkavouras P.,Bougiatioti A.,Grivas G.,et al. On the regional aspects of new particle formation in the Eastern Mediterranean: A comparative study between a background and an urban site based on long term observations[J]. Atmospheric Research,2020,239.
APA	Kalkavouras P..,Bougiatioti A..,Grivas G..,Stavroulas I..,Kalivitis N..,...&Mihalopoulos N..(2020).On the regional aspects of new particle formation in the Eastern Mediterranean: A comparative study between a background and an urban site based on long term observations.,239.
MLA	Kalkavouras P.,et al."On the regional aspects of new particle formation in the Eastern Mediterranean: A comparative study between a background and an urban site based on long term observations".239(2020).