The Puy de Dôme ICe Nucleation Intercomparison Campaign (PICNIC): comparison between online and offline methods in ambient air
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Published:2024-02-29
Issue:4
Volume:24
Page:2651-2678
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ISSN:1680-7324
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Container-title:Atmospheric Chemistry and Physics
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language:en
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Short-container-title:Atmos. Chem. Phys.
Author:
Lacher LarissaORCID, Adams Michael P., Barry KevinORCID, Bertozzi BarbaraORCID, Bingemer Heinz, Boffo Cristian, Bras Yannick, Büttner Nicole, Castarede DimitriORCID, Cziczo Daniel J., DeMott Paul J.ORCID, Fösig RomyORCID, Goodell Megan, Höhler Kristina, Hill Thomas C. J.ORCID, Jentzsch Conrad, Ladino Luis A.ORCID, Levin Ezra J. T., Mertes Stephan, Möhler OttmarORCID, Moore Kathryn A.ORCID, Murray Benjamin J.ORCID, Nadolny Jens, Pfeuffer Tatjana, Picard DavidORCID, Ramírez-Romero Carolina, Ribeiro Mickael, Richter Sarah, Schrod JannORCID, Sellegri Karine, Stratmann Frank, Swanson Benjamin E., Thomson Erik S.ORCID, Wex HeikeORCID, Wolf Martin J., Freney EvelynORCID
Abstract
Abstract. Ice crystal formation in mixed-phase clouds is initiated by specific aerosol particles, termed ice-nucleating particles (INPs). Only a tiny fraction of all aerosol particles are INPs, providing a challenge for contemporary INP measurement techniques. Models have shown that the presence of INPs in clouds can impact their radiative properties and induce precipitation formation. However, for a qualified implementation of INPs in models, measurement techniques able to accurately detect the temperature-dependent INP concentration are needed. Here we present measurements of INP concentrations in ambient air under conditions relevant to mixed-phase clouds from a total of 10 INP methods over 2 weeks in October 2018 at the Puy de Dôme observatory in central France. A special focus in this intercomparison campaign was placed on having overlapping sampling periods. Although a variety of different measurement principles were used, the majority of the data show INP concentrations within a factor of 5 of one another, demonstrating the suitability of the instruments to derive model-relevant INP data. Lower values of comparability are likely due to instrument-specific features such as aerosol lamina spreading in continuous-flow diffusion chambers, demonstrating the need to account for such phenomena when interpreting INP concentration data from online instruments. Moreover, consistently higher INP concentrations were observed from aerosol filters collected on the rooftop at the Puy de Dôme station without the use of an aerosol inlet.
Funder
Horizon 2020 Karlsruhe Institute of Technology National Science Foundation Deutsche Forschungsgemeinschaft Vetenskapsrådet European Research Council
Publisher
Copernicus GmbH
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