Article Dans Une Revue Atmospheric Chemistry and Physics Année : 2025

Observations of high-time-resolution and size-resolved aerosol chemical composition and microphysics in the central Arctic: implications for climate-relevant particle properties

Jessica A Mirrielees
  • Fonction : Auteur
Matthew Boyer
  • Fonction : Auteur
Jessie M Creamean
  • Fonction : Auteur
Markus M Frey
Silvia Henning
Tiia Laurila
  • Fonction : Auteur
Vaios Moschos
Tuukka Petäjä
Kerri A Pratt
Lauriane L J Quéléver
Matthew D Shupe
Paul Zieger
Tuija Jokinen

Résumé

Aerosols play a critical role in the Arctic's radiative balance, influencing solar radiation and cloud formation. Limited observations in the central Arctic leave gaps in understanding aerosol dynamics year-round, affecting model predictions of climate-relevant aerosol properties. Here, we present the first annual high-timeresolution observations of submicron aerosol chemical composition in the central Arctic during the Arctic Ocean 2018 (AO2018) and the 2019-2020 Multidisciplinary drifting Observatory for the Study of Arctic Climate (MO-SAiC) expeditions. Seasonal variations in the aerosol mass concentrations and chemical composition in the central Arctic were found to be driven by typical Arctic seasonal regimes and resemble those of pan-Arctic landbased stations. Organic aerosols dominated the pristine summer, while anthropogenic sulfate prevailed in autumn and spring under haze conditions. Ammonium, which impacts aerosol acidity, was consistently less abundant, Published by Copernicus Publications on behalf of the European Geosciences Union. 2208 B. Heutte et al.: Observations of aerosol chemical composition and microphysics in the central Arctic relative to sulfate, in the central Arctic compared to lower latitudes of the Arctic. Cyclonic (storm) activity was found to have a significant influence on aerosol variability by enhancing emissions from local sources and the transport of remote aerosol. Local wind-generated particles contributed up to 80 % (20 %) of the cloud condensation nuclei population in autumn (spring). While the analysis presented herein provides the current central Arctic aerosol baseline, which will serve to improve climate model predictions in the region, it also underscores the importance of integrating short-timescale processes, such as seasonal wind-driven aerosol sources from blowing snow and open leads/ocean in model simulations. This is particularly important, given the decline in mid-latitude anthropogenic emissions and the increase in local ones.

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hal-04957066 , version 1 (19-02-2025)

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Benjamin Heutte, Nora Bergner, Hélène Angot, Jakob B Pernov, Lubna Dada, et al.. Observations of high-time-resolution and size-resolved aerosol chemical composition and microphysics in the central Arctic: implications for climate-relevant particle properties. Atmospheric Chemistry and Physics, 2025, 25 (4), pp.2207-2241. ⟨10.5194/acp-25-2207-2025⟩. ⟨hal-04957066⟩
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