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| Titel |
Does the size distribution of mineral dust aerosols depend on the wind speed at emission? |
| VerfasserIn |
J. F. Kok |
| 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 ; 11, no. 19 ; Nr. 11, no. 19 (2011-10-07), S.10149-10156 |
| Datensatznummer |
250010117
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| Publikation (Nr.) |
 copernicus.org/acp-11-10149-2011.pdf |
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| Zusammenfassung |
| The size distribution of mineral dust aerosols partially determines their
interactions with clouds, radiation, ecosystems, and other components of the
Earth system. Several theoretical models predict that the dust
size distribution depends on the wind speed at emission, with larger wind
speeds predicted to produce smaller aerosols. The present study investigates
this prediction using a compilation of published measurements of the
size-resolved vertical dust flux emitted by eroding soils. Surprisingly,
these measurements indicate that the size distribution of naturally emitted
dust aerosols is independent of the wind speed. The recently formulated brittle fragmentation theory of dust emission
is consistent with this finding, whereas other theoretical models are not. The
independence of the emitted dust size distribution with wind speed
simplifies both the interpretation of geological records of dust deposition
and the parameterization of dust emission in atmospheric circulation models. |
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