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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)
Author(s) -
Schiettecatte LaureSophie,
Gazeau Frédéric,
van der Zee Claar,
Brion Natacha,
Borges Alberto V.
Publication year - 2006
Publication title -
geochemistry, geophysics, geosystems
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.928
H-Index - 136
ISSN - 1525-2027
DOI - 10.1029/2005gc001161
Subject(s) - carbon dioxide , environmental science , atmosphere (unit) , plume , estuary , ecosystem , atmospheric sciences , outgassing , carbon fibers , oceanography , photosynthesis , bloom , environmental chemistry , partial pressure , dissolved organic carbon , carbon cycle , ecology , chemistry , meteorology , biology , geology , oxygen , physics , materials science , organic chemistry , composite number , composite material , biochemistry
A 4‐year time series (2001–2004) of the partial pressure of CO 2 (pCO 2 ) and air‐sea CO 2 fluxes is reported in the Scheldt estuarine plume. This system is oversaturated in CO 2 with respect to the atmosphere, except during the spring phytoplanktonic bloom, and acts as a net source of CO 2 to the atmosphere of 0.7 mol C m −2 yr −1 that represents 7 to 27% of the inner Scheldt estuary CO 2 emission. Results also highlight that a high spatial and temporal coverage of the surface pCO 2 in coastal ecosystems is crucial for reliable estimations of air‐sea CO 2 fluxes. The seasonal variations of pCO 2 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 pCO 2 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 CO 2 toward the atmosphere seems to be largely due to the outgassing of the inputs of CO 2 from the inner Scheldt estuary, rather than due to organic carbon degradation.

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