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| Titel |
Atmospheric ice nuclei in the Eyjafjallajökull volcanic ash plume |
| VerfasserIn |
H. Bingemer, H. Klein, M. Ebert, W. Haunold, U. Bundke, T. Herrmann, K. Kandler, D. Müller-Ebert, S. Weinbruch, A. Judt, A. Wéber, B. Nillius, K. Ardon-Dryer, Z. Levin, J. Curtius |
| 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 ; 12, no. 2 ; Nr. 12, no. 2 (2012-01-19), S.857-867 |
| Datensatznummer |
250010535
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| Publikation (Nr.) |
 copernicus.org/acp-12-857-2012.pdf |
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| Zusammenfassung |
We have sampled atmospheric ice nuclei (IN) and aerosol in Germany and in
Israel during spring 2010. IN were analyzed by the static vapor diffusion
chamber FRIDGE, as well as by electron microscopy. During the
Eyjafjallajökull volcanic eruption of April 2010 we have measured the
highest ice nucleus number concentrations (>600 l−1) in our record of 2 yr
of daily IN measurements in central Germany. Even in Israel, located
about 5000 km away from Iceland, IN were as high as otherwise only during
desert dust storms. The fraction of aerosol activated as ice nuclei at
−18 °C and 119% rhice and the corresponding area density of
ice-active sites per aerosol surface were considerably higher than what we
observed during an intense outbreak of Saharan dust over Europe in May 2008.
Pure volcanic ash accounts for at least 53–68% of the 239 individual ice
nucleating particles that we collected in aerosol samples from the event and
analyzed by electron microscopy. Volcanic ash samples that had been
collected close to the eruption site were aerosolized in the laboratory and
measured by FRIDGE. Our analysis confirms the relatively poor ice nucleating
efficiency (at −18 °C and 119% ice-saturation) of such "fresh"
volcanic ash, as it had recently been found by other workers. We find that
both the fraction of the aerosol that is active as ice nuclei as well as the
density of ice-active sites on the aerosol surface are three orders of
magnitude larger in the samples collected from ambient air during the
volcanic peaks than in the aerosolized samples from the ash collected close
to the eruption site. From this we conclude that the ice-nucleating
properties of volcanic ash may be altered substantially by aging and
processing during long-range transport in the atmosphere, and that global
volcanism deserves further attention as a potential source of atmospheric
ice nuclei. |
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