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Discussion papers
https://doi.org/10.5194/acp-2018-1274
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2018-1274
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 18 Dec 2018

Research article | 18 Dec 2018

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

Annual variability of ice nucleating particle concentrations at different Arctic locations

Heike Wex1, Lin Huang2, Wendy Zhang2, Hayley Hung3, Rita Traversi4,7, Silvia Becagli4,7, Rebecca J. Sheesley5, Claire E. Moffett5, Tate E. Barrett5, Rossana Bossi6, Henrik Skov6, Anja Hünerbein1, Jasmin Lubitz1, Mareike Löffler1, Olivia Linke1, Markus Hartmann1, Paul Herenz1, and Frank Stratmann1 Heike Wex et al.
  • 1Experimental Aerosol and Cloud Microphysics, Leibniz Institute for Tropospheric Research (TROPOS), Permoser Str. 15, 04318 Leipzig, Germany
  • 2Climate Research Division, Atmospheric Science & Technology Directorate, STB, Environment & Climate Change Canada, 4905 Dufferin St., M3H 5T4, Toronto, Canada
  • 3Air Quality Processes Research Section, Environment & Climate Change Canada, 4905 Dufferin St., M3H 5T4, Toronto, Canada
  • 4Department of Chemistry "Ugo Schiff", University of Florence, Via della Lastruccia, 3, I-50019 Sesto F.no (Florence), Italy
  • 5Department of Environmental Science, Baylor University, One Bear Place 97266, Waco, TX 76798-7266, US
  • 6Department of Environmental Science, iCLIMATE, Aarhus University, Frederiksborgvej 399, 4000 Roskilde, Denmark
  • 7CNR–ISAC, National Research Council of Italy, Institute of Atmospheric Sciences and Climate, via Gobetti 101, 40129, Bologna, Italy

Abstract. Number concentrations of ice nucleating particles (NINP) in the Arctic were derived from ground-based filter samples. Examined samples had been collected in Alert (Nunavut, Northern Canadian Archipelago on Ellesmere Island), Utqiagvik, formerly known as Barrow (Alaska), Ny Ålesund (Svalbard) and at the Villum Research Station (VRS, North Greenland). For the former two stations, examined filters span a full yearly cycle. For VRS, 10 weekly samples, mostly from different month of one year, were included. Samples from Ny Ålesund were collected during the months from March until September of one year. At all four stations, highest concentrations were found in the summer months from roughly June to September. For those stations with sufficient data coverage, an annual cycle can be seen. The spectra of NINP observed at the highest temperatures, i.e., those obtained for summer month, showed the presence of INP that nucleate ice up to − 5 °C. It is know from literature that ice activivity observed at such high temperatures indicates the presence of ice active material of biogenic origin. Spectra observed at the lowest temperatures, i.e., those derived for winter month, were on the lower end of respective values reported in literature. An analysis concerning the origin of INP that were ice active at high temperatures was carried out, using back-trajectories and satellite information. Both, terrestrial locations in the Arctic and the adjacent sea were found to be possible source areas for highly active INP.

Heike Wex et al.
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Short summary
We found an annual cycle for ice nucleating particles in the Arctic. These particles are important for Arctic clouds, as they can change clouds' lifetime. We suggeset that higher concentrations of these particles in summertime originate from the Arctic biosphere (both marine and terrestrial). With a warming Arctic, these concentrations may increase further, influence the aerosol cloud interactions and therewith the observed strong warming of the Arctic.
We found an annual cycle for ice nucleating particles in the Arctic. These particles are...
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