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Vertical profiles of sub-3 nm particles over the boreal forest

Authors: Leino, Katri; Lampilahti, Janne; Poutanen, Pyry; Väänänen, Riikka; Manninen, Antti; Buenrostro Mazon, Stephany; Dada, Lubna; +16 Authors

Vertical profiles of sub-3 nm particles over the boreal forest

Abstract

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 100 m 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.

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39 references, page 1 of 4

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    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
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Average
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EC| ERA-PLANET
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ERA-PLANET
The European network for observing our changing planet
  • Funder: European Commission (EC)
  • Project Code: 689443
  • Funding stream: H2020 | ERA-NET-Cofund
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EC| BACCHUS
Project
BACCHUS
Impact of Biogenic versus Anthropogenic emissions on Clouds and Climate: towards a Holistic UnderStanding
  • Funder: European Commission (EC)
  • Project Code: 603445
  • Funding stream: FP7 | SP1 | ENV
sysimport:crosswalk:repository
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EC| ATM-GTP
Project
ATM-GTP
Atmospheric Gas-to-Particle conversion
  • Funder: European Commission (EC)
  • Project Code: 742206
  • Funding stream: H2020 | ERC | ERC-ADG
iis
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AKA| NanoBioMass - Natural Secreted Nano Vesicles as a Source of Novel Biomass Products for Circular Economy / Consortium: NanoBiomass
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