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| Titel |
Inter-annual variability of the Pelagic-Benthic coupling in the upwelling system off central Chile |
| VerfasserIn |
M. Graco, D. Gutiérrez, L. Farías |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7340
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| Digitales Dokument |
URL |
| Erschienen |
In: 1st Alexander von Humboldt International Conference ; Nr. 6 (2006-01-23), S.127-132 |
| Datensatznummer |
250003248
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| Publikation (Nr.) |
 copernicus.org/adgeo-6-127-2006.pdf |
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| Zusammenfassung |
| The coastal region of central Chile (36° S) is one of the most
productive coastal systems, characterized by a marked seasonality in the
upwelling regime, that brings subsurface waters rich in nutrient and poor in
oxygen (ESSW) into the euphotic zone. This oceanographic condition depends
basically on the equatorward wind strength and is modified on different time
scales, with the El Niño-Southern Oscillation (ENSO) phenomenon as the
main source of interannual variability in the Pacific Ocean. Here we present
an effort to integrate physical and biogeochemical variability associated
with in situ information and experiments at coastal stations off central
Chile (36° S) in order to improve the knowledge on the pelagic-benthic
coupling in this upwelling system during the warm ENSO phase or El Niño.
Carbon fluxes exported from the water column to the sediments and the
ammonium exchange across the sediment-water interface are discussed together
with oceanographic and benthic conditions. All measurements and estimations
were carried out from May 1997 until April 2001 at two stations, one located
inside Concepción Bay (~28 m depth), and the other on the
continental shelf at ~36° S (~88 m depth). The results show
that the pelagic and benthic systems are strongly coupled off central Chile
(36° S). Oceanographic variability associated with upwelling events
(seasonal scale) and an El Niño event (interannual scale) was observed.
The carbon fluxes exported to the sediments, the benthic conditions (i.e.,
quantity and quality of the sediment organic matter), and the ammonium
exchange across the sediment-water interface, responded to the seasonal
regime of upwelling during non El Niño years as well as to the ENSO
related oceanographic variability. |
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