04 Jul 2022
04 Jul 2022
Status: this preprint is currently under review for the journal ACP.

Measurement report: High Arctic aerosol hygroscopicity at sub- and supersaturated conditions during spring and summer

Andreas Massling1, Robert Lange1,2, Jakob Pernov1,3, Ulrich Gosewinkel1, Lise-Lotte Sørensen1, and Henrik Skov1 Andreas Massling et al.
  • 1Department of Environmental Science, iClimate, Aarhus University, 4000 Roskilde, Denmark
  • 2ROCKWOOL Group, 2640 Hedehusene, Denmark
  • 3Extreme Environments Research Laboratory, École Polytechnique Fédérale de Lausanne, 1951 Sion, Switzerland

Abstract. Aerosol hygroscopic growth and cloud droplet formation influence the radiation transfer budget of the atmosphere and thereby the climate. In the Arctic, these aerosol properties may have a more pronounced effect on the climate compared to the mid-latitudes. Hygroscopic growth and cloud condensation nuclei (CCN) concentrations of High Arctic aerosols were measured during two field studies in the spring and summer of 2016. The study site was the Villum Research Station (Villum) at Station Nord in the northeastern region of Greenland. Aerosol hygroscopic growth was measured with a hygroscopic tandem differential mobility analyzer (HTDMA) over a total of 23 days, and CCN concentrations were measured over a period of 95 days. Continuous particle number size distributions were recorded, facilitating calculations of aerosol CCN activation diameters and aerosol kappa (κ)-values. In spring, average CCN concentrations, at supersaturations (SS) of 0.1 to 0.3 %, ranged from 53.7 to 85.3 cm-3, with critical activation diameters ranging from 130.2 to 80.2 nm, and κCCN ranging from 0.28–0.35. In summer, average CCN concentrations were 20.8 to 47.6 cm-3, while critical activation diameters and κCCN were from 137.1 to 76.7 nm and 0.23–0.35, respectively. Mean particle hygroscopic growth factors ranged from 1.60 to 1.75 at 90 % relative humidity in spring, while values between 1.47 and 1.67 were observed in summer depending on initial dry size. Although the summer aerosol number size distributions were characterized by frequent new particle formation events, the CCN population at cloud-relevant supersaturations was determined by accumulation mode aerosols. This emphasizes the importance of accumulation mode aerosol sources to provide available CCN during summer. The influence of particle hygroscopic growth on the radiative transfer through aerosol-radiation interactions could be of major importance. The results of this study are directly applicable in the modeling of direct and indirect climate effects of Arctic aerosols. Targeted chemical and morphological analysis, based on filter samples or on-line techniques, could further clarify the role of primary organic marine influence on Arctic aerosol CCN concentrations and therewith climate effects.

Andreas Massling et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Referee Comment on acp-2022-413', Anonymous Referee #1, 04 Aug 2022
  • RC2: 'Comment on acp-2022-413', Anonymous Referee #2, 12 Aug 2022
  • AC1: 'Comment on acp-2022-413: Answer to Anonymous Referee 1:', Andreas Massling, 30 Nov 2022
  • AC2: 'Comment on acp-2022-413: Answer to Anonymous Referee 2', Andreas Massling, 30 Nov 2022

Andreas Massling et al.

Data sets

Datasets for 'High Arctic aerosol hygroscopicity at sub- and supersaturated conditions during spring and summer' Pernov, Jakob; Lange, Robert; Massling, Andreas

Andreas Massling et al.


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Short summary
The effect of anthropogenic activities on cloud formation introduces the highest uncertainties with respect to climate change. Data on Arctic aerosols and their corresponding cloud-forming properties are very scarce and most important as the Arctic is warming about two times as fast as the rest of the globe. Our studies investigate aerosols in the remote Arctic and suggest relatively high cloud-forming potential, although differences are observed between the Arctic spring and summer.