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Time series of the partial pressure of carbon dioxide (2001-2004) and preliminary inorganic carbon budget in the Scheldt plume (Belgian coastal waters) Schiettecatte, L.-S.; Gazeau, F.; van der Zee, C.; Brion, N.; Borges, A.V. (2006). Time series of the partial pressure of carbon dioxide (2001-2004) and preliminary inorganic carbon budget in the Scheldt plume (Belgian coastal waters). Geophys. Res. Abstr. 8: 07238 In: Geophysical Research Abstracts. Copernicus: Katlenburg-Lindau. ISSN 1029-7006; e-ISSN 1607-7962, meer Is gerelateerd aan: Schiettecatte, L.-S.; Gazeau, F.; van der Zee, C.; Brion, N.; Borges, A.V. (2006). Time series of the partial pressure of carbon dioxide (2001-2004) and preliminary inorganic carbon budget in the Scheldt plume (Belgian coastal waters). Geochem. Geophys. Geosyst. 7(6): 16 pp. dx.doi.org/10.1029/2005GC001161, meer

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Beschikbaar in	Auteurs
VLIZ: Open access 233033 [ download pdf ]

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Trefwoorden

Chemical compounds > Carbon compounds > Atmospheric gases > Carbon dioxide Measurement > Pressure measurement Time series Marien/Kust; Brak water; Zoet water

Author keywords

CO2<; sub> air-sea fluxes; Belgian coastal water; Scheldt estuary

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Auteurs		Top
Schiettecatte, L.-S. Gazeau, F. van der Zee, C.	Brion, N. Borges, A.V.

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Abstract

A 4-year time series (2001–2004) of the partial pressure of CO2 (pCO2) and air-sea CO2 fluxes is reported in the Scheldt estuarine plume. This system is oversaturated in CO2 with respect to the atmosphere, except during the spring phytoplanktonic bloom, and acts as a net source of CO2 to the atmosphere of 0.7 mol C m-2 yr-1 that represents 7 to 27% of the inner Scheldt estuary CO2 emission. Results also highlight that a high spatial and temporal coverage of the surface pCO2 in coastal ecosystems is crucial for reliable estimations of air-sea CO2 fluxes. The seasonal variations of pCO2 seem to be more dominated by biological activities (photosynthesis/respiration) than by temperature change. A stochiometrically linked C/P mass balance budget failed to provide net ecosystem production estimates consistent with the pCO2 dynamics in this area. It is hypothesized that this discrepancy is related to physiological characteristics of the dominant phytoplanktonic species (Phaeocystis sp.) within the studied area. On the basis of a preliminary dissolved inorganic carbon input/output budget, the annual emission of CO2 toward the atmosphere seems to be largely due to the outgassing of the inputs of CO2 from the inner Scheldt estuary, rather than due to organic carbon degradation.

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