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Amann, T. ., Institute for Biogeochemistry and Marine Chemistry, KlimaCampus, University of Hamburg, Hamburg, Germany, thorben.amann@zmaw.de
Weiss, A. ., Institute for Biogeochemistry and Marine Chemistry, KlimaCampus, University of Hamburg, Hamburg, Germany, andreas.weiss@zmaw.de
Hartmann, J. ., Institute for Biogeochemistry and Marine Chemistry, KlimaCampus, University of Hamburg, Hamburg, Germany, jens.hartmann@zmaw.de

DECADAL TRENDS OF BIOGEOCHEMICAL MATTER LAND-OCEAN FLUXES THROUGH A TIDAL ESTUARY CONSIDERING UPSTREAM CATCHMENT CHANGES (ELBE, GERMANY)

In the tidal Elbe estuary the improvement of water quality in the upper catchment area leads to a change of organic carbon processing in the oxygen minimum zone (OMZ) during the summer months. The decline of labile DOC concentrations and rising oxygen concentrations increased the significance of POC mineralization in this zone. Between 1985-1989 only 8.3% of POC entering the OMZ was mineralized during transition. After 1997 this value rose to more than 50%. Restoration of the water quality not only shifted the internal organic carbon processing from DOC to POC, but also revealed that the OMZ buffers the downstream transfer of oxygen. After 1993 oxygen saturation in the OMZ stayed constant at 75% while increasing upstream to 110%. The time series analysis also revealed that overall pCO2 values of the OMZ decreased by more than 50% of the values in 1985. Results have implications for the assessment of global or regional land-ocean biogeochemical matter fluxes through estuaries, as studies - in general - omit the tidal freshwater part in their analysis.

Poster presentation

Session #:S94
Date: 02-15-2011
Time: 16:00 - 18:00

Presentation is given by student: Yes

PosterID: 170