 |
| Titel |
Chemical characterisation of iron in dust and biomass burning aerosols during AMMA-SOP0/DABEX: implication for iron solubility |
| VerfasserIn |
R. Paris, K. V. Desboeufs, P. Formenti, S. Nava, C. Chou |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 10, no. 9 ; Nr. 10, no. 9 (2010-05-06), S.4273-4282 |
| Datensatznummer |
250008427
|
| Publikation (Nr.) |
 copernicus.org/acp-10-4273-2010.pdf |
|
|
|
|
|
| Zusammenfassung |
| The chemical composition and the soluble fraction were determined in aerosol
samples collected during flights of AMMA-SOP0/DABEX campaign, which were
conducted in the West African Sahel during dry season (2006). Two aerosol
types are encountered in this period: dust particles (DUST) and biomass
burning aerosol (BB). Chemical analysis and microscope observations showed
that the iron (Fe) found in BB samples mainly originates from dust particles
mostly internally mixed in the biomass burning layer. Chemical analyses of
samples showed that the Fe solubility is lower in African dust samples than
in biomass burning aerosols. Our data provide a first idea of the
variability of iron dust solubility in the source region (0.1% and
3.4%). We found a relationship between iron solubility/clay
content/source which partly confirms that the variability of iron solubility
in this source region is related to the character and origin of the aerosols
themselves. In the biomass burning samples, no relationship were found
between Fe solubility and either the concentrations of acidic species
(SO42−, NO3− or oxalate) or the content of carbon (TC,
OC, BC). Therefore, we were unable to determine what processes are involved
in this increase of iron solubility. In terms of supply of soluble Fe to
oceanic ecosystems on a global scale, the higher solubility observed for Fe
in biomass burning could imply an indirect source of Fe to marine
ecosystems. But these aerosols are probably not significant because the
Sahara is easily the dominant source of Fe to the Atlantic Ocean. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|