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The seasonal behaviour of carbon dioxide and oxygen in the coastal North Sea along the Netherlands
Hoppema, J.M.J. (1991). The seasonal behaviour of carbon dioxide and oxygen in the coastal North Sea along the Netherlands. Neth. J. Sea Res. 28(3): 167-179
In: Netherlands Journal of Sea Research. Netherlands Institute for Sea Research (NIOZ): Groningen; Den Burg. ISSN 0077-7579, more
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  • Hoppema, J.M.J.

    Total C02 (TC02) distribution patterns in the coastal North Sea in different seasons showed decreasing values towards the open sea. The higher values near the coast were caused by TC02 outflow from the Rhine/Meuse. The highest values were observed in November, irrespective of the salinity. Mixing generally resulted in linear relationships between TC02 and salinity, but scattering was lowest in November. Both pH (measured) and pC02 (calculated) clearly demonstrated the influence of biological activity on the C02 system. In November, pC02 was very high near the coast (> 450 µatm). This is attributed mainly to mixing, and only partly to mineralization. The oxygen distributions were consistent with those of the C02-related parameters, the deviations being opposite. The data showed that, in accordance with theory, the equilibration of 02 with the atmosphere was faster than for C02. TC02- alkalinity diagrams were only of limited value, since normalization to constant salinity was hampered by freshwater variations of TC02 combined with the variability of the residence time of the water masses in the coastal area.

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