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| Titel |
Downward fluxes of elemental carbon, metals and polycyclic aromatic hydrocarbons in settling particles from the deep Ionian Sea (NESTOR site), Eastern Mediterranean |
| VerfasserIn |
C. Theodosi, C. Parinos, A. Gogou, A. Kokotos, S. Stavrakakis, V. Lykousis, J. Hatzianestis, N. Mihalopoulos |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 10, no. 7 ; Nr. 10, no. 7 (2013-07-03), S.4449-4464 |
| Datensatznummer |
250018323
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| Publikation (Nr.) |
 copernicus.org/bg-10-4449-2013.pdf |
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| Zusammenfassung |
| To assess sources and major processes controlling the vertical transport of
both anthropogenic and natural chemical species in a deep basin of the
Eastern Mediterranean Sea (SE Ionian Sea, Nestor site), we performed chemical
characterization (elemental carbon, major and trace metals and polycyclic
aromatic hydrocarbons) of marine sinking particles. Sediment traps were
deployed at five successive depths, 700, 1200, 2000, 3200 and 4300 m from
the sea surface from May 2007 to October 2008. Fluxes of all measured
chemical species, attributed to both natural and anthropogenic sources,
exhibited minimum values from January to March 2008 and maximum from April to
September 2008. Crustal matter flux from atmospheric inputs – either
"freshly" deposited or stored in the surface layers – plays an important
role in the temporal variability of particulate marine matter fluxes along
with particulate organic carbon export, imposing ballast effects. Tracers
(elemental carbon, retene) of the devastating forest fires that occurred in
August 2007 in southern Greece were detected in sediment trap material from
all depths with a delay of 15 days at 4300 m, indicating a rapid and
well-coupled transport of sinking particulate material between the
sea-surface and deep layers of the Eastern Mediterranean Sea. This is in
accordance with an evident covariance between certain compounds, suggesting
common sources and/or transport mechanisms to depth. Lateral inputs of
pollutants at the deepest trap (4300 m) are probably of importance, related
to the periodic influence of deep Adriatic water at the study site. |
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