Diesel soot aging in urban plumes within hours under cold dark and humid conditions

Fresh and aged diesel soot particles have different impacts on climate and human health. While fresh diesel soot particles are highly aspherical and non-hygroscopic, aged particles are spherical and hygroscopic. Aging and its effect on water uptake also controls the dispersion of diesel soot in the...

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Autores principales: Eriksson, A. C., Wittbom, C., Roldin, P., Sporre, M., Öström, E., Nilsson, P., Martinsson, J., Rissler, J., Nordin, E. Z., Svenningsson, B., Pagels, J., Swietlicki, E.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2017
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5620063/
https://www.ncbi.nlm.nih.gov/pubmed/28959023
http://dx.doi.org/10.1038/s41598-017-12433-0
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author Eriksson, A. C.
Wittbom, C.
Roldin, P.
Sporre, M.
Öström, E.
Nilsson, P.
Martinsson, J.
Rissler, J.
Nordin, E. Z.
Svenningsson, B.
Pagels, J.
Swietlicki, E.
author_facet Eriksson, A. C.
Wittbom, C.
Roldin, P.
Sporre, M.
Öström, E.
Nilsson, P.
Martinsson, J.
Rissler, J.
Nordin, E. Z.
Svenningsson, B.
Pagels, J.
Swietlicki, E.
author_sort Eriksson, A. C.
collection PubMed
description Fresh and aged diesel soot particles have different impacts on climate and human health. While fresh diesel soot particles are highly aspherical and non-hygroscopic, aged particles are spherical and hygroscopic. Aging and its effect on water uptake also controls the dispersion of diesel soot in the atmosphere. Understanding the timescales on which diesel soot ages in the atmosphere is thus important, yet knowledge thereof is lacking. We show that under cold, dark and humid conditions the atmospheric transformation from fresh to aged soot occurs on a timescale of less than five hours. Under dry conditions in the laboratory, diesel soot transformation is much less efficient. While photochemistry drives soot aging, our data show it is not always a limiting factor. Field observations together with aerosol process model simulations show that the rapid ambient diesel soot aging in urban plumes is caused by coupled ammonium nitrate formation and water uptake.
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spelling pubmed-56200632017-10-11 Diesel soot aging in urban plumes within hours under cold dark and humid conditions Eriksson, A. C. Wittbom, C. Roldin, P. Sporre, M. Öström, E. Nilsson, P. Martinsson, J. Rissler, J. Nordin, E. Z. Svenningsson, B. Pagels, J. Swietlicki, E. Sci Rep Article Fresh and aged diesel soot particles have different impacts on climate and human health. While fresh diesel soot particles are highly aspherical and non-hygroscopic, aged particles are spherical and hygroscopic. Aging and its effect on water uptake also controls the dispersion of diesel soot in the atmosphere. Understanding the timescales on which diesel soot ages in the atmosphere is thus important, yet knowledge thereof is lacking. We show that under cold, dark and humid conditions the atmospheric transformation from fresh to aged soot occurs on a timescale of less than five hours. Under dry conditions in the laboratory, diesel soot transformation is much less efficient. While photochemistry drives soot aging, our data show it is not always a limiting factor. Field observations together with aerosol process model simulations show that the rapid ambient diesel soot aging in urban plumes is caused by coupled ammonium nitrate formation and water uptake. Nature Publishing Group UK 2017-09-28 /pmc/articles/PMC5620063/ /pubmed/28959023 http://dx.doi.org/10.1038/s41598-017-12433-0 Text en © The Author(s) 2017 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Eriksson, A. C.
Wittbom, C.
Roldin, P.
Sporre, M.
Öström, E.
Nilsson, P.
Martinsson, J.
Rissler, J.
Nordin, E. Z.
Svenningsson, B.
Pagels, J.
Swietlicki, E.
Diesel soot aging in urban plumes within hours under cold dark and humid conditions
title Diesel soot aging in urban plumes within hours under cold dark and humid conditions
title_full Diesel soot aging in urban plumes within hours under cold dark and humid conditions
title_fullStr Diesel soot aging in urban plumes within hours under cold dark and humid conditions
title_full_unstemmed Diesel soot aging in urban plumes within hours under cold dark and humid conditions
title_short Diesel soot aging in urban plumes within hours under cold dark and humid conditions
title_sort diesel soot aging in urban plumes within hours under cold dark and humid conditions
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5620063/
https://www.ncbi.nlm.nih.gov/pubmed/28959023
http://dx.doi.org/10.1038/s41598-017-12433-0
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