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In-cloud measurements highlight the role of aerosol hygroscopicity in cloud droplet formation

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published version
Date
2016
Author(s)
Väisänen Olli
Ruuskanen Antti
Ylisirniö Arttu
Miettinen Pasi
Portin Harri
Hao Liqing
Leskinen Ari
Komppula Mika
Romakkaniemi Sami
Lehtinen Kari EJ
Virtanen Annele
Unique identifier
10.5194/acp-16-10385-2016
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Citation
Väisänen Olli. Ruuskanen Antti. Ylisirniö Arttu. Miettinen Pasi. Portin Harri. Hao Liqing. Leskinen Ari. Komppula Mika. Romakkaniemi Sami. Lehtinen Kari EJ. Virtanen Annele. (2016). In-cloud measurements highlight the role of aerosol hygroscopicity in cloud droplet formation.  ATMOSPHERIC CHEMISTRY AND PHYSICS, 16, 10385-10398. 10.5194/acp-16-10385-2016.
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CC BY http://creativecommons.org/licenses/by/4.0/
Abstract

The relationship between aerosol hygroscopicity and cloud droplet activation was studied at the Puijo measurement station in Kuopio, Finland, during the autumn 2014. The hygroscopic growth of 80, 120 and 150  nm particles was measured at 90 % relative humidity with a hygroscopic tandem differential mobility analyzer. Typically, the growth factor (GF) distributions appeared bimodal with clearly distinguishable peaks around 1.0–1.1 and 1.4–1.6. However, the relative contribution of the two modes appeared highly variable reflecting the probable presence of fresh anthropogenic particle emissions. The hygroscopicity-dependent activation properties were estimated in a case study comprising four separate cloud events with varying characteristics. At 120 and 150 nm, the activation efficiencies within the low- and high-GF modes varied between 0–34 and 57–83 %, respectively, indicating that the less hygroscopic particles remained mostly non-activated, whereas the more hygroscopic mode was predominantly scavenged into cloud droplets. By modifying the measured GF distributions, it was estimated how the cloud droplet concentrations would change if all the particles belonged to the more hygroscopic group. According to κ-Köhler simulations, the cloud droplet concentrations increased up to 70 % when the possible feedback effects on effective peak supersaturation (between 0.16 and 0.29 %) were assumed negligible. This is an indirect but clear illustration of the sensitivity of cloud formation to aerosol chemical composition.

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https://erepo.uef.fi/handle/123456789/6158
Link to the original item
http://dx.doi.org/10.5194/acp-16-10385-2016
Publisher
Copernicus Publications on behalf of the European Geosciences Union
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  • Luonnontieteiden ja metsätieteiden tiedekunta [1109]
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