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| Titel |
Response of acid mobilization of iron-containing mineral dust to improvement of air quality projected in the future |
| VerfasserIn |
A. Ito, L. Xu |
| 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 ; 14, no. 7 ; Nr. 14, no. 7 (2014-04-07), S.3441-3459 |
| Datensatznummer |
250118567
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| Publikation (Nr.) |
 copernicus.org/acp-14-3441-2014.pdf |
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| Zusammenfassung |
| Acidification of dust aerosols may increase aerosol iron (Fe) solubility,
which is linked to mineral properties. Combustion aerosols can also elevate
aerosol iron solubility when aerosol loading is low. Here, we use an
atmospheric chemical transport model to investigate the deposition of
filterable iron and its response to changes in anthropogenic emissions of
both combustion aerosols and precursor gases. By introducing three classes of
iron-containing minerals into the detailed aerosol chemistry model, we
provide a theoretical examination of the effects of different dissolution
behaviors on the acid mobilization of iron. Comparisons of modeled Fe
dissolution curves with the measured dissolution rates for African, east
Asian, and Australian dust samples show overall good agreement under acidic
conditions. The improved treatment of Fe in mineral dust and its dissolution
scheme results in reasonable predictive capability for iron solubility over
the oceans in the Northern Hemisphere. Our model results suggest that the
improvement of air quality projected in the future will lead to a decrease of
the filterable iron deposition from iron-containing mineral dust to the
eastern North Pacific due to less acidification in Asian dust, which is mainly
associated with the reduction of nitrogen oxides (NOx) emissions. These
results could have important implications for iron fertilization of
phytoplankton growth, and highlight the necessity of improving the
process-based quantitative understanding of the response of the chemical
modification in iron-containing minerals to environmental changes. |
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