high concentrations of sub-3nm clusters and frequent new particle formation observed in the po valley, italy, during the pegasos 2012 campaign
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2016
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Abstract
The concentrations of neutral and charged sub-3nm clusters and their
connection to new particle formation (NPF) were investigated during the
PEGASOS campaign (7 June–9 July 2012) at the San Pietro Capofiume
measurement station in the Po Valley, Italy. Continuous high concentrations
of sub-3nm clusters were detected during the measurement period, although
the condensation sink was relatively high (median value 1.1 × 10−2 s−1). The median cluster concentrations were 2140
and 7980 cm−3 in the size bins of 1.5–1.8 and 1.8–3 nm,
and the majority of them were electrically neutral. NPF events were
observed during the measurement period frequently, on 86 % of the days.
The median growth rates of clusters during the events were 4.3,
6.0 and 7.2 nm h−1 in the size ranges of 1.5–3,
3–7 and 7–20 nm. The median formation rate of 1.6 nm
clusters was high, 45 cm−3 s−1, and it exceeded the median
formation rate of 2 nm clusters by 1 order of magnitude. The ion-induced
nucleation fraction was low; the median values were 0.7 % at 1.6 nm and
3.0 % at 2 nm. On NPF event days the neutral cluster concentration had a
maximum around 09:00 (local winter time), which was absent on a non-event
day. The increase in the cluster concentrations in the morning coincided
with the increase in the boundary layer height. At the same time radiation,
temperature and SO2 concentration increased, and RH and condensation
sink decreased. The concentrations of neutral and charged clusters were
observed to have a positive correlation with sulfuric acid proxy, indicating
the significance of sulfuric acid for the cluster formation in San Pietro
Capofiume. The condensation sink had a negative correlation with the
concentration of charged clusters but no clear relation to the neutral
cluster concentration. This finding, together with back-trajectory analysis,
suggests that the precursor vapors of the clusters and background aerosol
particles, acting as their sink, have possibly originated from the same
sources, including e.g., power plants and industrial areas in the Po Valley.
| Reference Key |
kontkanen2016atmospherichigh
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|---|---|
| Authors | ;J. Kontkanen;E. Järvinen;E. Järvinen;H. E. Manninen;K. Lehtipalo;K. Lehtipalo;J. Kangasluoma;S. Decesari;G. P. Gobbi;A. Laaksonen;A. Laaksonen;T. Petäjä;M. Kulmala |
| Journal | Journal of agricultural and food chemistry |
| Year | 2016 |
| DOI |
10.5194/acp-16-1919-2016
|
| URL | |
| Keywords |
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