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| Titel |
The role of iron and black carbon in aerosol light absorption |
| VerfasserIn |
Y. Derimian, A. Karnieli, Y. J. Kaufman, M. O. Andreae, T. W. Andreae, O. Dubovik, W. Maenhaut, I. Koren |
| 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 ; 8, no. 13 ; Nr. 8, no. 13 (2008-07-10), S.3623-3637 |
| Datensatznummer |
250006274
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| Publikation (Nr.) |
 copernicus.org/acp-8-3623-2008.pdf |
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| Zusammenfassung |
Iron is a major component of atmospheric aerosols, influencing the light
absorption ability of mineral dust, and an important micronutrient that
affects oceanic biogeochemistry. The regional distribution of the iron
concentration in dust is important for climate studies; however, this is
difficult to obtain since it requires in-situ aerosol sampling or simulation of
complex natural processes. Simultaneous studies of aerosol chemical
composition and radiometric measurements of aerosol optical properties,
which were performed in the Negev desert of Israel continuously for about
eight years, suggest a potential for deriving a relationship between
chemical composition and light absorption properties, in particular the
spectral single-scattering albedo.
The two main data sets of the present study were obtained by a sun/sky
radiometer and a stacked filter unit sampler that collects particles in
coarse and fine size fractions. Analysis of chemical and optical data showed
the presence of mixed dust and pollution aerosol in the study area, although
their sources appear to be different. Spectral SSA showed an evident
response to increased concentrations of iron, black carbon equivalent
matter, and their mixing state. A relationship that relates the spectral
SSA, the percentage of iron in total particulate mass, and the pollution
components was derived. Results calculated, using this relationship, were
compared with measurements from dust episodes in several locations around
the globe. The comparison showed reasonable agreement between the calculated
and the observed iron concentrations, and supported the validity of the
suggested approach for the estimation of iron concentrations in mineral
dust. |
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