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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...
Autores principales: | , , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
John Wiley and Sons Inc.
2016
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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. |
format | Online Article Text |
id | pubmed-5175215 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2016 |
publisher | John Wiley and Sons Inc. |
record_format | MEDLINE/PubMed |
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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