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| Titel |
Modeling the processing of mineral iron during dust transport |
| VerfasserIn |
Ulrike Vogelsberg, Ralf Wolke, Andreas Tilgner, Ina Tegen, Hartmut Herrmann |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250095421
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| Publikation (Nr.) |
 EGU/EGU2014-10872.pdf |
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| Zusammenfassung |
| The Saharan desert and the Gobi desert are the main contributors to Aeolian desert dust,
which is a major source of micronutrients to the remote ocean regions. Micronutrients, such
as transition metals like iron or copper, are regarded essential for biological processes of
different marine species. In this context recent studies have shown that soluble iron, since it is
generally the most abundant transition metal in dust particles, has the ability to control
marine productivity and thereby likely influence the CO2- budget. Nevertheless, the
processing of desert dust leading to the release of soluble iron still lacks sufficient
understanding since several factors control the solubilization process. Especially
anthropogenic emissions are regarded to significantly add to the amount of soluble iron by
acidification of dust particles or by the direct emission of soluble iron comprised, e.g. in coal
fly ash.
For the investigation of the dissolution process of iron that takes place during dust
transportation the spectral air parcel model SPACCIM is used. A mechanism describing the
precipitation and dissolution of mineral particles by heterogeneous surface reactions has been
implemented. Trajectory properties were derived from COSMO-MUSCAT simulations or
from re-analysis data by HYSPLIT. Differences in the chemical composition and the amount
of anthropogenic and naturally emitted species on the North African continent and the highly
industrialized region of South-East Asia have considerable impact on the acidification of the
desert dust. Under this aspect, special cases of dust outbreaks of the Saharan desert and the
Gobi desert are investigated and compared with focus on soluble iron produced. |
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