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DOI	10.5194/acp-19-4127-2019
	Vertical profiles of sub-3nm particles over the boreal forest
	Leino K.; Lampilahti J.; Poutanen P.; Väänänen R.; Manninen A.; Buenrostro Mazon S.; Dada L.; Franck A.; Wimmer D.; Aalto P.P.; Ahonen L.R.; Enroth J.; Kangasluoma J.; Keronen P.; Korhonen F.; Laakso H.; Matilainen T.; Siivola E.; Manninen H.E.; Lehtipalo K.; Kerminen V.-M.; Petäjä T.; Kulmala M.
发表日期	2019
ISSN	16807316
起始页码	2127
结束页码	2138
卷号	19 期号:6
英文摘要	This work presents airborne observations of sub- 3 nm particles in the lower troposphere and investigates new particle formation (NPF) within an evolving boundary layer (BL). We studied particle concentrations together with supporting gas and meteorological data inside the planetary BL over a boreal forest site in Hyytiälä, southern Finland. The analysed data were collected during three flight measurement campaigns: May-June 2015, August 2015 and April- May 2017, including 27 morning and 26 afternoon vertical profiles. As a platform for the instrumentation, we used a Cessna 172 aircraft. The analysed flight data were collected horizontally within a 30 km distance from SMEAR II in Hyytiälä and vertically from 100m above ground level up to 2700 m. The number concentration of 1.5-3 nm particles was observed to be, on average, the highest near the forest canopy top and to decrease with increasing altitude during the mornings of NPF event days. This indicates that the precursor vapours emitted by the forest play a key role in NPF in Hyytiälä. During daytime, newly formed particles were observed to grow in size and the particle population became more homogenous within the well-mixed BL in the afternoon. During undefined days with respect to NPF, we also detected an increase in concentration of 1.5-3 nm particles in the morning but not their growth in size, which indicates an interrupted NPF process during these undefined days. Vertical mixing was typically stronger during the NPF event days than during the undefined or non-event days. The results shed light on the connection between boundary layer dynamics and NPF. © Author(s) 2019.
语种	英语
scopus关键词	boreal forest; boundary layer; concentration (composition); forest canopy; nanoparticle; troposphere; vertical mixing; vertical profile; Finland; Hyytiala; Pirkanmaa
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/144528
作者单位	Institute for Atmospheric and Earth System Research/Physics, Faculty of Science, University of Helsinki, P.O. Box 64, Helsinki, 00014, Finland; CERN, Geneva 23, 1211, Switzerland; Finnish Meteorological Institute, Erik Palménin aukio 1, Helsinki, 00560, Finland
推荐引用方式 GB/T 7714	Leino K.,Lampilahti J.,Poutanen P.,et al. Vertical profiles of sub-3nm particles over the boreal forest[J],2019,19(6).
APA	Leino K..,Lampilahti J..,Poutanen P..,Väänänen R..,Manninen A..,...&Kulmala M..(2019).Vertical profiles of sub-3nm particles over the boreal forest.Atmospheric Chemistry and Physics,19(6).
MLA	Leino K.,et al."Vertical profiles of sub-3nm particles over the boreal forest".Atmospheric Chemistry and Physics 19.6(2019).