December 18, 2018 Journal article Open Access

Wex, Heike; Huang, Lin; Zhang, Wendy; Hung, Hayley; Traversi, Rita; Becagli, Silvia; Sheesley, Rebecca J.; Moffett, Claire E.; Barrett, Tate E.; Bossi, Rossana; Skov, Henrik; Hünerbein, Anja; Lubitz, Jasmin; Löffler, Mareike; Linke, Olivia; Hartmann, Markus; Herenz, Paul; Stratmann, Frank

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    <subfield code="a">Annual variability of ice-nucleating particle concentrations at different Arctic locations</subfield>
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    <subfield code="a">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), Utqiaġvik, formerly known as Barrow (Alaska), Ny-Ålesund
(Svalbard), and at the Villum Research Station (VRS; northern Greenland). For
the former two stations, examined filters span a full yearly cycle. For VRS,
10 weekly samples, mostly from different months 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 months, showed the presence of INPs that nucleate ice up to
−5 ∘C. Although the nature of these highly ice-active INPs could
not be determined in this study, it often has been described in the
literature that ice activity observed at such high temperatures originates
from the presence of ice-active material of biogenic origin. Spectra observed
at the lowest temperatures, i.e., those derived for winter months, were on
the lower end of the respective values from the literature on Arctic INPs or
INPs from midlatitude continental sites, to which a comparison is presented
herein. An analysis concerning the origin of INPs 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 INPs.</subfield>
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    <subfield code="a">10.5194/acp-19-5293-2019</subfield>
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