Preprints
https://doi.org/10.5194/egusphere-2025-2798
https://doi.org/10.5194/egusphere-2025-2798
26 Jun 2025
 | 26 Jun 2025

Ice Nucleating Particle Concentrations over the Eurasian-Arctic seas

Guangyu Li, André Welti, Iris Thurnherr, Ulrike Lohmann, and Zamin A. Kanji

Abstract. Ice nucleating particles (INPs) catalyze primary ice formation in Arctic low-level mixed-phase clouds, influencing their persistence and radiative properties. Knowledge of the abundance, sources, and nature of INPs over the remote Arctic Ocean is scarce, particularly in the Eurasian Arctic. In this work, we present summertime measurements of INP concentrations (NINP) in immersion mode from the ship-based Arctic Century Expedition exploring the Barents, Kara, and Laptev Seas and the adjacent high Arctic islands and archipelagos during August to September 2021. Atmospheric NINP were found to be lower than in continental high-latitude sites, particularly at temperatures below -15 °C, suggesting a lower abundance of mineral dust INPs. The geographical NINP variability in the Eurasian Arctic shows that the highest NINP are observed when the ship was in the ice-free ocean, marginal ice zones (MIZ), and in the vicinity of land. Very low NINP were measured within the ice pack. The peak NINP was observed north of Novaya Zemlya where backward trajectories indicate air parcels arriving from the western Siberian coast. Overall, we find that INP sources are local to regional, with little evidence for long-range transport to the investigated area of the Eurasian Arctic in summer months.

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Guangyu Li, André Welti, Iris Thurnherr, Ulrike Lohmann, and Zamin A. Kanji

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  • RC1: 'Comment on egusphere-2025-2798', Anonymous Referee #1, 30 Jun 2025
  • RC2: 'Comment on egusphere-2025-2798', Anonymous Referee #2, 15 Jul 2025
  • RC3: 'Comment on egusphere-2025-2798', Anonymous Referee #3, 22 Jul 2025
Guangyu Li, André Welti, Iris Thurnherr, Ulrike Lohmann, and Zamin A. Kanji
Guangyu Li, André Welti, Iris Thurnherr, Ulrike Lohmann, and Zamin A. Kanji

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Short summary
This study presents ship-based measurements of summertime ice-nucleating particles (INPs) over the data-scarce Eurasian-Arctic Seas. We found that INPs are driven by both local and regional sources, with the highest levels observed near land and over ice-free waters. This study is highlighted for improving the understanding of INP abundance, sources, and their role in cloud processes in the rapidly warming Arctic.
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