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Highly Active Ice-Nucleating Particles at the Summer North Pole
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Number of Authors: 16
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2022 (English)In: Journal of Geophysical Research - Atmospheres, ISSN 2169-897X, E-ISSN 2169-8996, Vol. 127, no 6, article id e2021JD036059Article in journal (Refereed) Published
Abstract [en]

The amount of ice versus supercooled water in clouds is important for their radiative properties and role in climate feedbacks. Hence, knowledge of the concentration of ice-nucleating particles (INPs) is needed. Generally, the concentrations of INPs are found to be very low in remote marine locations allowing cloud water to persist in a supercooled state. We had expected the concentrations of INPs at the North Pole to be very low given the distance from open ocean and terrestrial sources coupled with effective wet scavenging processes. Here we show that during summer 2018 (August and September) high concentrations of biological INPs (active at >−20°C) were sporadically present at the North Pole. In fact, INP concentrations were sometimes as high as those recorded at mid-latitude locations strongly impacted by highly active biological INPs, in strong contrast to the Southern Ocean. Furthermore, using a balloon borne sampler we demonstrated that INP concentrations were often different at the surface versus higher in the boundary layer where clouds form. Back trajectory analysis suggests strong sources of INPs near the Russian coast, possibly associated with wind-driven sea spray production, whereas the pack ice, open leads, and the marginal ice zone were not sources of highly active INPs. These findings suggest that primary ice production, and therefore Arctic climate, is sensitive to transport from locations such as the Russian coast that are already experiencing marked climate change.

Place, publisher, year, edition, pages
2022. Vol. 127, no 6, article id e2021JD036059
Keywords [en]
Arctic, ice-nucleating particles, ice, mixed-phase clouds
National Category
Earth and Related Environmental Sciences
Research subject
SWEDARCTIC 2018, Arctic Ocean 2018
Identifiers
URN: urn:nbn:se:polar:diva-8955DOI: 10.1029/2021JD036059ISI: 000776467500024Scopus ID: 2-s2.0-85127305449OAI: oai:DiVA.org:polar-8955DiVA, id: diva2:1721039
Available from: 2022-04-20 Created: 2022-12-20Bibliographically approved

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Karlsson, LinnLeck, CarolineSalter, Matthew E.Siegel, KarolinaZieger, PaulZinke, Julika
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