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| Titel |
Trace metal characterization of aerosol particles and cloud water during HCCT 2010 |
| VerfasserIn |
K. W. Fomba, D. Pinxteren, K. Müller, Y. Iinuma, T. Lee, J. L. Collett, H. Herrmann |
| 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. 15 ; Nr. 15, no. 15 (2015-08-10), S.8751-8765 |
| Datensatznummer |
250119953
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| Publikation (Nr.) |
 copernicus.org/acp-15-8751-2015.pdf |
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| Zusammenfassung |
| Trace metal characterization of bulk and size-resolved aerosol and cloud
water samples were performed during the Hill Cap Cloud Thuringia (HCCT)
campaign. Cloud water was collected at the top of Mt. Schmücke while
aerosol samples were collected at two stations upwind and downwind of Mt.
Schmücke. Fourteen trace metals including Ti, V, Fe, Mn, Co, Zn, Ni, Cu,
As, Sr, Rb, Pb, Cr, and Se were investigated during four full cloud events
(FCEs) that fulfilled the conditions of a continuous air mass flow through the
three stations. Aerosol particle trace metal concentrations were found to be
lower than those observed in the same region during previous field
experiments but were within a similar range to those observed in other rural
regions in Europe. Fe and Zn were the most abundant elements with
concentration ranges of 0.2–111.6 and
1.1–32.1 ng m−3,
respectively. Fe, Mn, and Ti were mainly found in coarse mode aerosols while
Zn, Pb, and As were mostly found in the fine mode. Correlation and enrichment
factor analysis of trace metals revealed that trace metals such as Ti and Rb
were mostly of crustal origin while trace metals such as Zn, Pb, As, Cr, Ni,
V, and Cu were of anthropogenic origin. Trace metals such as Fe and Mn were of
mixed origins including crustal and combustion sources. Trace metal cloud
water concentration decreased from Ti, Mn, Cr, to Co with average
concentrations of 9.18, 5.59, 5.54, and 0.46 μg L−1,
respectively. A non-uniform distribution of soluble Fe, Cu, and Mn was
observed across the cloud drop sizes. Soluble Fe and Cu were found mainly in
cloud droplets with diameters between 16 and 22 μm, while Mn was
found mostly in larger drops greater than 22 μm. Fe(III) was the
main form of soluble Fe especially in the small and larger drops with
concentrations ranging from 2.2 to
37.1 μg L−1. In
contrast to other studies, Fe(II) was observed mainly in the evening hours,
implying its presence was not directly related to photochemical processes.
Aerosol–cloud interaction did not lead to a marked increase in soluble trace
metal concentrations; rather it led to differences in the chemical composition of
the aerosol due to preferential loss of aerosol particles through physical
processes including cloud drop deposition to vegetative surfaces. |
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