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Seasonal and long-term changes in pH in the Dutch coastal zone
Provoost, P.; van Heuven, S.; Soetaert, K.; Laane, R.W.P.M.; Middelburg, J.J. (2010). Seasonal and long-term changes in pH in the Dutch coastal zone. Biogeosciences 7(11): 3869-3878. http://dx.doi.org/10.5194/bg-7-3869-2010
In: Gattuso, J.P.; Kesselmeier, J. (Ed.) Biogeosciences. Copernicus Publications: Göttingen. ISSN 1726-4170; e-ISSN 1726-4189, meer
Peer reviewed article  

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Auteurs  Top 
  • Provoost, P.
  • van Heuven, S.
  • Soetaert, K., meer
  • Laane, R.W.P.M.
  • Middelburg, J.J., meer

Abstract
    Recent observations and modelling studies suggest that biogeochemical changes can mask atmospheric CO2-induced pH decreases. Data collected by the Dutch monitoring authorities in different coastal systems (North Sea, Wadden Sea, Ems-Dollard, Eastern Scheldt and Scheldt estuary) since 1975 provide an excellent opportunity to test whether this is the case in the Dutch coastal zone. The time-series were analysed using Multi-Resolution Analysis (MRA) which resulted in the identification of system-dependent patterns on both seasonal and intra-annual time scales. The observed rates of pH change greatly exceed those expected from enhanced CO2 uptake, thus suggesting that other biogeochemical processes, possibly related to changes in nutrient loading, can play a dominant role in ocean acidification.

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