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| Titel |
Natural or anthropogenic? On the origin of atmospheric sulfate deposition in the Andes of southeastern Ecuador |
| VerfasserIn |
S. Makowski Giannoni, R. Rollenbeck, K. Trachte, J. Bendix |
| 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. 20 ; Nr. 14, no. 20 (2014-10-28), S.11297-11312 |
| Datensatznummer |
250119122
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| Publikation (Nr.) |
 copernicus.org/acp-14-11297-2014.pdf |
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| Zusammenfassung |
| Atmospheric sulfur deposition above certain limits can represent a threat to
tropical forests, causing nutrient imbalances and mobilizing toxic elements
that impact biodiversity and forest productivity. Atmospheric sources of
sulfur deposited by precipitation have been roughly identified in only a few
lowland tropical forests. Even scarcer are studies of this type in tropical
mountain forests, many of them mega-diversity hotspots and especially
vulnerable to acidic deposition. In these places, the topographic complexity and
related streamflow conditions affect the origin, type, and intensity of
deposition. Furthermore, in regions with a variety of natural and
anthropogenic sulfur sources, like active volcanoes and biomass burning, no
source emission data has been used for determining the contribution of each
source to the deposition. The main goal of the current study is to evaluate
sulfate (SO4- deposition by rain and occult precipitation at two
topographic locations in a tropical mountain forest of southern Ecuador, and
to trace back the deposition to possible emission sources applying back-trajectory modeling. To link upwind natural (volcanic) and anthropogenic
(urban/industrial and biomass-burning) sulfur emissions and observed sulfate
deposition, we employed state-of-the-art inventory and satellite data,
including volcanic passive degassing as well. We conclude that
biomass-burning sources generally dominate sulfate deposition at the
evaluated sites. Minor sulfate transport occurs during the shifting of the
predominant winds to the north and west. Occult precipitation sulfate
deposition and likely rain sulfate deposition are mainly linked to
biomass-burning emissions from the Amazon lowlands. Volcanic and
anthropogenic emissions from the north and west contribute to occult
precipitation sulfate deposition at the mountain crest Cerro del Consuelo meteorological
station and to rain-deposited sulfate at the upriver mountain pass El Tiro
meteorological station. |
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