Physicochemical characterization and source apportionment of Arctic ice-nucleating particles observed in Ny-Ålesund in autumn 2019 ...

• Main Authors: Li, Guangyu, Wilbourn, Elise K., Cheng, Zezhen, Wieder, Jörg, Fagerson, Allison, Henneberger, Jan, Motos, Ghislain, Traversi, Rita, Brooks, Sarah D., Mazzola, Mauro, China, Swarup, Nenes, Athanasios, Lohmann, Ulrike, Hiranuma, Naruki, Kanji, Zamin A
• Format: Article in Journal/Newspaper
• Language: English
• Published: ETH Zurich 2023
• Subjects: Ny Ålesund; Ny-Ålesund; Svalbard
• Online Access: https://dx.doi.org/10.3929/ethz-b-000637191; http://hdl.handle.net/20.500.11850/637191

Ice-nucleating particles (INPs) initiate primary ice formation in Arctic mixed-phase clouds (MPCs), altering cloud radiative properties and modulating precipitation. For atmospheric INPs, the complexity of their spatiotemporal variations, heterogeneous sources, and evolution via intricate atmospheric interactions challenge the understanding of their impact on microphysical processes in Arctic MPCs and induce an uncertain representation in climate models. In this work, we performed a comprehensive analysis of atmospheric aerosols at the Arctic coastal site in Ny-Ålesund (Svalbard, Norway) from October to November 2019, including their ice nucleation ability, physicochemical properties, and potential sources. Overall, INP concentrations (NINP) during the observation season were approximately up to 3 orders of magnitude lower compared to the global average, with several samples showing degradation of NINP after heat treatment, implying the presence of proteinaceous INPs. Particle fluorescence was substantially ... : Atmospheric Chemistry and Physics, 23 (18) ...