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Future changes in the Baltic Sea acid-base (pH) and oxygen balances
Department of Earth Sciences, Univerity of Gothenburg.
Department of Earth Sciences, Univerity of Gothenburg.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL. (AWEP)
Department of Physical Geography and Ecosystem Science, Lund University.
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2012 (English)In: Tellus. Series B, Chemical and physical meteorology, ISSN 0280-6509, E-ISSN 1600-0889, Vol. 64, 19586- p.Article in journal (Refereed) Published
Abstract [en]

Possible future changes in Baltic Sea acid–base (pH) and oxygen balances were studied using a catchment–sea coupled model system and numerical experiments based on meteorological and hydrological forcing datasets and scenarios. By using objective statistical methods, climate runs for present climate conditions were examined and evaluated using Baltic Sea modelling. The results indicate that increased nutrient loads will not inhibit future Baltic Sea acidification; instead, the seasonal pH cycle will be amplified by increased biological production and mineralization. All examined scenarios indicate future acidification of the whole Baltic Sea that is insensitive to the chosen global climate model. The main factor controlling the direction and magnitude of future pH changes is atmospheric CO2 concentration (i.e. emissions). Climate change and land-derived changes (e.g. nutrient loads) affect acidification mainly by altering the seasonal cycle and deep-water conditions. Apart from decreasing pH, we also project a decreased saturation state of calcium carbonate, decreased respiration index and increasing hypoxic area – all factors that will threaten the marine ecosystem. We demonstrate that substantial reductions in fossil-fuel burning are needed to minimise the coming pH decrease and that substantial reductions in nutrient loads are needed to reduce the coming increase in hypoxic and anoxic waters.

Place, publisher, year, edition, pages
2012. Vol. 64, 19586- p.
Keyword [en]
Ocean acidification, marine acidification, eutrophication, climate change, Baltic Sea, Kattegat
National Category
Oceanography, Hydrology, Water Resources
URN: urn:nbn:se:uu:diva-190675DOI: 10.3402/tellusb.v64i0.19586ISI: 000312931200001OAI: oai:DiVA.org:uu-190675DiVA: diva2:584000
EU, FP7, Seventh Framework Programme, 217246Swedish Research Council, 621-2007-3750
Available from: 2013-01-08 Created: 2013-01-08 Last updated: 2013-02-05Bibliographically approved

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