Refined classification and characterization of atmospheric new-particle formation events using air ions
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Published:2018-12-17
Issue:24
Volume:18
Page:17883-17893
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ISSN:1680-7324
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Container-title:Atmospheric Chemistry and Physics
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language:en
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Short-container-title:Atmos. Chem. Phys.
Author:
Dada LubnaORCID, Chellapermal Robert, Buenrostro Mazon StephanyORCID, Paasonen PauliORCID, Lampilahti Janne, Manninen Hanna E., Junninen Heikki, Petäjä TuukkaORCID, Kerminen Veli-MattiORCID, Kulmala MarkkuORCID
Abstract
Abstract. Atmospheric new-particle formation (NPF) is a worldwide-observed phenomenon that affects the human health and the global climate.
With a growing network of global atmospheric measurement stations, efforts
towards investigating NPF have increased. In this study, we present an
automated method to classify days into four categories including NPF events,
non-events and two classes in between, which then ensures reproducibility
and minimizes the hours spent on manual classification. We applied our
automated method to 10 years of data collected at the SMEAR II measurement
station in Hyytiälä, southern Finland using a Neutral cluster and Air Ion
Spectrometer (NAIS). In contrast to the traditionally applied classification
methods, which categorize days into events and non-events and ambiguous days as
undefined days, our method is able to classify the undefined days as it
accesses the initial steps of NPF at sub-3 nm sizes. Our results show that, on
∼24 % of the days in Hyytiälä, a regional NPF event
occurred and was characterized by nice weather and favourable conditions
such as a clear sky and low condensation sink. Another class found in
Hyytiälä is the transported event class, which seems to be NPF
carried horizontally or vertically to our measurement location and it
occurred on 17 % of the total studied days. Additionally, we found that an
ion burst, wherein the ions apparently fail to grow to larger sizes, occurred
on 18 % of the days in Hyytiälä. The transported events and ion
bursts were characterized by less favourable ambient conditions than regional
NPF events and thus experienced interrupted particle formation or growth.
Non-events occurred on 41 % of the days and were characterized by
complete cloud cover and high relative humidity. Moreover, for regional
NPF events occurring at the measurement site, the method identifies the start
time, peak time and end time, which helps us focus on variables within an
exact time window to better understand NPF at a process level. Our automated
method can be modified to work in other measurement locations where NPF is
observed.
Funder
European Commission
Publisher
Copernicus GmbH
Subject
Atmospheric Science
Reference42 articles.
1. Aalto, P., Hämeri, K., Becker, E., Weber, R., Salm, J., Mäkelä,
J. M., Hoell, C., O'dowd, C. D., Hansson, H.-C., Väkevä, M., Koponen,
I. K., Buzorius, G., and Kulmala, M.: Physical characterization of aerosol
particles during nucleation events, Tellus B, 53, 344–358, https://doi.org/10.1034/j.1600-0889.2001.530403.x, 2001. 2. Artaxo, P., Rizzo, L. V., Brito, J. F., Barbosa, H. M., Arana, A., Sena, E.
T., Cirino, G. G., Bastos, W., Martin, S. T., and Andreae, M. O.: Atmospheric
aerosols in Amazonia and land use change: from natural biogenic to biomass
burning conditions, Faraday Discuss., 165, 203–235, 2013. 3. Asmi, A., Wiedensohler, A., Laj, P., Fjaeraa, A.-M., Sellegri, K., Birmili,
W., Weingartner, E., Baltensperger, U., Zdimal, V., Zikova, N., Putaud,
J.-P., Marinoni, A., Tunved, P., Hansson, H.-C., Fiebig, M., Kivekäs, N.,
Lihavainen, H., Asmi, E., Ulevicius, V., Aalto, P. P., Swietlicki, E.,
Kristensson, A., Mihalopoulos, N., Kalivitis, N., Kalapov, I., Kiss, G., de
Leeuw, G., Henzing, B., Harrison, R. M., Beddows, D., O'Dowd, C., Jennings,
S. G., Flentje, H., Weinhold, K., Meinhardt, F., Ries, L., and Kulmala, M.:
Number size distributions and seasonality of submicron particles in Europe
2008–2009, Atmos. Chem. Phys., 11, 5505–5538,
https://doi.org/10.5194/acp-11-5505-2011, 2011. 4. Asmi, E., Kondratyev, V., Brus, D., Laurila, T., Lihavainen, H., Backman, J.,
Vakkari, V., Aurela, M., Hatakka, J., Viisanen, Y., Uttal, T., Ivakhov, V.,
and Makshtas, A.: Aerosol size distribution seasonal characteristics measured
in Tiksi, Russian Arctic, Atmos. Chem. Phys., 16, 1271–1287,
https://doi.org/10.5194/acp-16-1271-2016, 2016. 5. Baranizadeh, E., Arola, A., Hamed, A., Nieminen, T., Mikkonen, S., Virtanen,
A., Kulmala, M., Lehtinen, K., and Laaksonen, A.: The effect of cloudiness on
new-particle formation: investigation of radiation levels, Boreal Env. Res.,
19, 343–354, 2014.
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