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Ice residual properties in mixed‐phase clouds at the high‐alpine Jungfraujoch site

Ice residual (IR) and total aerosol properties were measured in mixed‐phase clouds (MPCs) at the high‐alpine Jungfraujoch research station. Black carbon (BC) content and coating thickness of BC‐containing particles were determined using single‐particle soot photometers. The ice activated fraction (I...

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Autores principales: Kupiszewski, Piotr, Zanatta, Marco, Mertes, Stephan, Vochezer, Paul, Lloyd, Gary, Schneider, Johannes, Schenk, Ludwig, Schnaiter, Martin, Baltensperger, Urs, Weingartner, Ernest, Gysel, Martin
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5175215/
https://www.ncbi.nlm.nih.gov/pubmed/28066694
http://dx.doi.org/10.1002/2016JD024894
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author Kupiszewski, Piotr
Zanatta, Marco
Mertes, Stephan
Vochezer, Paul
Lloyd, Gary
Schneider, Johannes
Schenk, Ludwig
Schnaiter, Martin
Baltensperger, Urs
Weingartner, Ernest
Gysel, Martin
author_facet Kupiszewski, Piotr
Zanatta, Marco
Mertes, Stephan
Vochezer, Paul
Lloyd, Gary
Schneider, Johannes
Schenk, Ludwig
Schnaiter, Martin
Baltensperger, Urs
Weingartner, Ernest
Gysel, Martin
author_sort Kupiszewski, Piotr
collection PubMed
description Ice residual (IR) and total aerosol properties were measured in mixed‐phase clouds (MPCs) at the high‐alpine Jungfraujoch research station. Black carbon (BC) content and coating thickness of BC‐containing particles were determined using single‐particle soot photometers. The ice activated fraction (IAF), derived from a comparison of IR and total aerosol particle size distributions, showed an enrichment of large particles in the IR, with an increase in the IAF from values on the order of 10(−4) to 10(−3) for 100 nm (diameter) particles to 0.2 to 0.3 for 1 μm (diameter) particles. Nonetheless, due to the high number fraction of submicrometer particles with respect to total particle number, IR size distributions were still dominated by the submicrometer aerosol. A comparison of simultaneously measured number size distributions of BC‐free and BC‐containing IR and total aerosol particles showed depletion of BC by number in the IR, suggesting that BC does not play a significant role in ice nucleation in MPCs at the Jungfraujoch. The potential anthropogenic climate impact of BC via the glaciation effect in MPCs is therefore likely to be negligible at this site and in environments with similar meteorological conditions and a similar aerosol population. The IAF of the BC‐containing particles also increased with total particle size, in a similar manner as for the BC‐free particles, but on a level 1 order of magnitude lower. Furthermore, BC‐containing IR were found to have a thicker coating than the BC‐containing total aerosol, suggesting the importance of atmospheric aging for ice nucleation.
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spelling pubmed-51752152017-01-05 Ice residual properties in mixed‐phase clouds at the high‐alpine Jungfraujoch site Kupiszewski, Piotr Zanatta, Marco Mertes, Stephan Vochezer, Paul Lloyd, Gary Schneider, Johannes Schenk, Ludwig Schnaiter, Martin Baltensperger, Urs Weingartner, Ernest Gysel, Martin J Geophys Res Atmos Research Articles Ice residual (IR) and total aerosol properties were measured in mixed‐phase clouds (MPCs) at the high‐alpine Jungfraujoch research station. Black carbon (BC) content and coating thickness of BC‐containing particles were determined using single‐particle soot photometers. The ice activated fraction (IAF), derived from a comparison of IR and total aerosol particle size distributions, showed an enrichment of large particles in the IR, with an increase in the IAF from values on the order of 10(−4) to 10(−3) for 100 nm (diameter) particles to 0.2 to 0.3 for 1 μm (diameter) particles. Nonetheless, due to the high number fraction of submicrometer particles with respect to total particle number, IR size distributions were still dominated by the submicrometer aerosol. A comparison of simultaneously measured number size distributions of BC‐free and BC‐containing IR and total aerosol particles showed depletion of BC by number in the IR, suggesting that BC does not play a significant role in ice nucleation in MPCs at the Jungfraujoch. The potential anthropogenic climate impact of BC via the glaciation effect in MPCs is therefore likely to be negligible at this site and in environments with similar meteorological conditions and a similar aerosol population. The IAF of the BC‐containing particles also increased with total particle size, in a similar manner as for the BC‐free particles, but on a level 1 order of magnitude lower. Furthermore, BC‐containing IR were found to have a thicker coating than the BC‐containing total aerosol, suggesting the importance of atmospheric aging for ice nucleation. John Wiley and Sons Inc. 2016-10-26 2016-10-27 /pmc/articles/PMC5175215/ /pubmed/28066694 http://dx.doi.org/10.1002/2016JD024894 Text en ©2016. The Authors. This is an open access article under the terms of the Creative Commons Attribution‐NonCommercial‐NoDerivs (http://creativecommons.org/licenses/by-nc-nd/4.0/) License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.
spellingShingle Research Articles
Kupiszewski, Piotr
Zanatta, Marco
Mertes, Stephan
Vochezer, Paul
Lloyd, Gary
Schneider, Johannes
Schenk, Ludwig
Schnaiter, Martin
Baltensperger, Urs
Weingartner, Ernest
Gysel, Martin
Ice residual properties in mixed‐phase clouds at the high‐alpine Jungfraujoch site
title Ice residual properties in mixed‐phase clouds at the high‐alpine Jungfraujoch site
title_full Ice residual properties in mixed‐phase clouds at the high‐alpine Jungfraujoch site
title_fullStr Ice residual properties in mixed‐phase clouds at the high‐alpine Jungfraujoch site
title_full_unstemmed Ice residual properties in mixed‐phase clouds at the high‐alpine Jungfraujoch site
title_short Ice residual properties in mixed‐phase clouds at the high‐alpine Jungfraujoch site
title_sort ice residual properties in mixed‐phase clouds at the high‐alpine jungfraujoch site
topic Research Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5175215/
https://www.ncbi.nlm.nih.gov/pubmed/28066694
http://dx.doi.org/10.1002/2016JD024894
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