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| Titel |
Ice nucleation by combustion ash particles at conditions relevant to mixed-phase clouds |
| VerfasserIn |
N. S. Umo, B. J. Murray, M. T. Baeza-Romero, J. M. Jones, A. R. Lea-Langton, T. L. Malkin, D. O'Sullivan, L. Neve, J. M. C. Plane, A. Williams |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 15, no. 9 ; Nr. 15, no. 9 (2015-05-11), S.5195-5210 |
| Datensatznummer |
250119703
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| Publikation (Nr.) |
 copernicus.org/acp-15-5195-2015.pdf |
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| Zusammenfassung |
| Ice-nucleating particles can modify cloud properties with implications for
climate and the hydrological cycle; hence, it is important to understand
which aerosol particle types nucleate ice and how efficiently they do so. It
has been shown that aerosol particles such as natural dusts, volcanic ash,
bacteria and pollen can act as ice-nucleating particles, but the ice-nucleating ability of
combustion ashes has not been studied. Combustion ashes are major by-products
released during the combustion of solid fuels and a significant amount of
these ashes are emitted into the atmosphere either during combustion or via
aerosolization of bottom ashes. Here, we show that combustion ashes (coal fly
ash, wood bottom ash, domestic bottom ash, and coal bottom ash) nucleate ice
in the immersion mode at conditions relevant to mixed-phase clouds. Hence,
combustion ashes could play an important role in primary ice formation in
mixed-phase clouds, especially in clouds that are formed near the emission
source of these aerosol particles. In order to quantitatively assess the
impact of combustion ashes on mixed-phase clouds, we propose that the
atmospheric abundance of combustion ashes should be quantified since up to
now they have mostly been classified together with mineral dust particles.
Also, in reporting ice residue compositions, a distinction should be made
between natural mineral dusts and combustion ashes in order to quantify the
contribution of combustion ashes to atmospheric ice nucleation. |
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