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Using Novel Molecular-Level Chemical Composition Observations of High Arctic Organic Aerosol for Predictions of Cloud Condensation Nuclei
Stockholms universitet, Institutionen för miljövetenskap.ORCID iD: 0000-0002-0760-729x
Stockholms universitet, Institutionen för miljövetenskap.
Stockholms universitet, Institutionen för miljövetenskap.ORCID iD: 0000-0003-0885-7650
Stockholms universitet, Institutionen för miljövetenskap.ORCID iD: 0000-0001-7000-6879
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Number of Authors: 16
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2022 (English)In: Environmental Science and Technology, ISSN 0013-936X, E-ISSN 1520-5851, Vol. 56, no 19, p. 13888-13899Article in journal (Refereed) Published
Abstract [en]

Predictions of cloud droplet activation in the late summertime (September) central Arctic Ocean are made using κ-Köhler theory with novel observations of the aerosol chemical composition from a high-resolution time-of-flight chemical ionization mass spectrometer with a filter inlet for gases and aerosols (FIGAERO-CIMS) and an aerosol mass spectrometer (AMS), deployed during the Arctic Ocean 2018 expedition onboard the Swedish icebreaker Oden. We find that the hygroscopicity parameter κ of the total aerosol is 0.39 ± 0.19 (mean ± std). The predicted activation diameter of ∼25 to 130 nm particles is overestimated by 5%, leading to an underestimation of the cloud condensation nuclei (CCN) number concentration by 4-8%. From this, we conclude that the aerosol in the High Arctic late summer is acidic and therefore highly cloud active, with a substantial CCN contribution from Aitken mode particles. Variability in the predicted activation diameter is addressed mainly as a result of uncertainties in the aerosol size distribution measurements. The organic κ was on average 0.13, close to the commonly assumed κ of 0.1, and therefore did not significantly influence the predictions. These conclusions are supported by laboratory experiments of the activation potential of seven organic compounds selected as representative of the measured aerosol.

Place, publisher, year, edition, pages
2022. Vol. 56, no 19, p. 13888-13899
Keywords [en]
aerosol-cloud interactions, cloud droplet activation, CCN closure, atmospheric aerosol, aerosol chemistry, chemical ionization mass spectrometry (CIMS), High Arctic
National Category
Environmental Engineering Earth and Related Environmental Sciences
Research subject
SWEDARCTIC 2018, Arctic Ocean 2018
Identifiers
URN: urn:nbn:se:polar:diva-8948DOI: 10.1021/acs.est.2c02162ISI: 000861947200001PubMedID: 36112784Scopus ID: 2-s2.0-85138805310OAI: oai:DiVA.org:polar-8948DiVA, id: diva2:1720792
Available from: 2022-10-26 Created: 2022-12-20Bibliographically approved

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Siegel, KarolinaNeuberger, AlmuthKarlsson, LinnZieger, PaulMattsson, FredrikKrejci, RadovanEkman, Annica M. L.Riipinen, IlonaMohr, Claudia
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