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Tytuł pozycji:

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

Tytuł:
Vertical profiles of sub-3 nm particles over the boreal forest
Autorzy:
K. Leino
J. Lampilahti
P. Poutanen
R. Väänänen
A. Manninen
S. Buenrostro Mazon
L. Dada
A. Franck
D. Wimmer
P. P. Aalto
L. R. Ahonen
J. Enroth
J. Kangasluoma
P. Keronen
F. Korhonen
H. Laakso
T. Matilainen
E. Siivola
H. E. Manninen
K. Lehtipalo
V.-M. Kerminen
T. Petäjä
M. Kulmala
Temat:
Physics
QC1-999
Chemistry
QD1-999
Źródło:
Atmospheric Chemistry and Physics, Vol 19, Pp 4127-4138 (2019)
Wydawca:
Copernicus Publications, 2019.
Rok publikacji:
2019
Kolekcja:
LCC:Physics
LCC:Chemistry
Typ dokumentu:
article
Opis pliku:
electronic resource
Język:
English
ISSN:
1680-7316
1680-7324
Relacje:
https://www.atmos-chem-phys.net/19/4127/2019/acp-19-4127-2019.pdf; https://doaj.org/toc/1680-7316; https://doaj.org/toc/1680-7324
DOI:
10.5194/acp-19-4127-2019
Dostęp URL:
https://doaj.org/article/1aa6b05695a74d348f886947fc3ebc67  Link otwiera się w nowym oknie
Numer akcesji:
edsdoj.1aa6b05695a74d348f886947fc3ebc67
Czasopismo naukowe
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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