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| Titel |
Using the significant dust deposition event on the glaciers of Mt.~Elbrus, Caucasus Mountains, Russia on 5 May 2009 to develop a method for dating and "provenancing" of desert dust events recorded in snow pack |
| VerfasserIn |
M. Shahgedanova, S. Kutuzov, K. H. White, G. Nosenko |
| 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 ; 13, no. 4 ; Nr. 13, no. 4 (2013-02-18), S.1797-1808 |
| Datensatznummer |
250017661
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| Publikation (Nr.) |
 copernicus.org/acp-13-1797-2013.pdf |
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| Zusammenfassung |
| A significant desert dust deposition event occurred on Mt. Elbrus, Caucasus
Mountains, Russia on 5 May 2009, where the deposited dust later appeared as
a brown layer in the snow pack. An examination of dust transportation
history and analysis of chemical and physical properties of the deposited
dust were used to develop a new approach for high-resolution "provenancing" of
dust deposition events recorded in snow pack using multiple independent
techniques. A combination of SEVIRI red-green-blue composite imagery, MODIS
atmospheric optical depth fields derived using the Deep Blue algorithm, air
mass trajectories derived with HYSPLIT model and analysis of meteorological
data enabled identification of dust source regions with high temporal
(hours) and spatial (ca. 100 km) resolution. Dust, deposited on 5 May 2009,
originated in the foothills of the Djebel Akhdar in eastern Libya where dust
sources were activated by the intrusion of cold air from the Mediterranean
Sea and Saharan low pressure system and transported to the Caucasus along
the eastern Mediterranean coast, Syria and Turkey. Particles with an average
diameter below 8 μm accounted for 90% of the measured particles in
the sample with a mean of 3.58 μm, median 2.48 μm. The chemical signature of this long-travelled dust was
significantly different from the locally-produced dust and close to that of
soils collected in a palaeolake in the source region, in concentrations of
hematite. Potential addition of dust from a secondary source in northern
Mesopotamia introduced uncertainty in the "provenancing" of dust from this
event. Nevertheless, the approach adopted here enables other dust horizons
in the snowpack to be linked to specific dust transport events recorded in
remote sensing and meteorological data archives. |
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