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Article Dans Une Revue Biogeosciences Discussions Année : 2005

Variability of the surface water partial pressure of CO2 in the North Sea

Résumé

The seasonal variability of the partial pressure of CO2 (pCO2) has been investigated in the North Sea, a northwest European shelf sea. Based on a seasonal, high resolution data set the main controlling factors - biological processes and temperature - have been identified and quantified. In the central and northern parts being a CO2-sink all year round, the biological control dominates the temperature control. In the southern part, the temperature control dominates the biological control at an annual scale, since the shallow water column prevents stronger net-CO2 removal from the surface layer due to the absence of seasonal stratification. The consequence is a reversal of the CO2 sea-to-air flux during the spring bloom period, the only time, when CO2 is taken up from the atmosphere in the southern region. Net community production in the mixed layer has been estimated to 4 mol C m-2yr-1 with higher values (4.3 mol C m-2yr-1) in the northern part and lower values in the southern part (2.6 mol C m-2yr-1).
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Dates et versions

hal-00297769 , version 1 (18-06-2008)

Identifiants

  • HAL Id : hal-00297769 , version 1

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H. Thomas, Yves Bozec, K. Elkalay, H. J. W. de Baar, A. V. Borges, et al.. Variability of the surface water partial pressure of CO2 in the North Sea. Biogeosciences Discussions, 2005, 2 (4), pp.757-777. ⟨hal-00297769⟩

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