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Using Novel Molecular-Level Chemical Composition Observations of High Arctic Organic Aerosol for Predictions of Cloud Condensation Nuclei

Siegel, Karolina ; Neuberger, Almuth ; Karlsson, Linn ; Zieger, Paul ; Mattsson, Fredrik ; Duplessis, Patrick ; Dada, Lubna ; Daellenbach, Kaspar ; Schmale, Julia and Baccarini, Andrea , et al. (2022) In Environmental Science and Technology 56(19). p.13888-13899
Abstract

Predictions of cloud droplet activation in the late summertime (September) central Arctic Ocean are made using κ-Kohler 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... (More)

Predictions of cloud droplet activation in the late summertime (September) central Arctic Ocean are made using κ-Kohler 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.

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organization
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type
Contribution to journal
publication status
published
subject
keywords
aerosol chemistry, aerosol-cloud interactions, atmospheric aerosol, CCN closure, chemical ionization mass spectrometry (CIMS), cloud droplet activation, High Arctic
in
Environmental Science and Technology
volume
56
issue
19
pages
12 pages
publisher
The American Chemical Society (ACS)
external identifiers
  • scopus:85138805310
  • pmid:36112784
ISSN
0013-936X
DOI
10.1021/acs.est.2c02162
language
English
LU publication?
yes
id
2eae2ef9-f093-46d7-ae2e-029205ecae39
date added to LUP
2022-12-22 09:58:44
date last changed
2025-01-07 02:26:17
@article{2eae2ef9-f093-46d7-ae2e-029205ecae39,
  abstract     = {{<p>Predictions of cloud droplet activation in the late summertime (September) central Arctic Ocean are made using κ-Kohler 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.</p>}},
  author       = {{Siegel, Karolina and Neuberger, Almuth and Karlsson, Linn and Zieger, Paul and Mattsson, Fredrik and Duplessis, Patrick and Dada, Lubna and Daellenbach, Kaspar and Schmale, Julia and Baccarini, Andrea and Krejci, Radovan and Svenningsson, Birgitta and Chang, Rachel and Ekman, Annica M.L. and Riipinen, Ilona and Mohr, Claudia}},
  issn         = {{0013-936X}},
  keywords     = {{aerosol chemistry; aerosol-cloud interactions; atmospheric aerosol; CCN closure; chemical ionization mass spectrometry (CIMS); cloud droplet activation; High Arctic}},
  language     = {{eng}},
  month        = {{10}},
  number       = {{19}},
  pages        = {{13888--13899}},
  publisher    = {{The American Chemical Society (ACS)}},
  series       = {{Environmental Science and Technology}},
  title        = {{Using Novel Molecular-Level Chemical Composition Observations of High Arctic Organic Aerosol for Predictions of Cloud Condensation Nuclei}},
  url          = {{http://dx.doi.org/10.1021/acs.est.2c02162}},
  doi          = {{10.1021/acs.est.2c02162}},
  volume       = {{56}},
  year         = {{2022}},
}