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Future changes in the Baltic Sea acid-base (pH) and oxygen balances
Vise andre og tillknytning
2012 (engelsk)Inngår i: Tellus. Series B, Chemical and physical meteorology, ISSN 0280-6509, E-ISSN 1600-0889, Vol. 64, s. 19586-Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
2012. Vol. 64, s. 19586-
Emneord [en]
Ocean acidification, marine acidification, eutrophication, climate change, Baltic Sea, Kattegat
HSV kategori
Identifikatorer
URN: urn:nbn:se:su:diva-87666DOI: 10.3402/tellusb.v64i0.19586ISI: 000312931200001OAI: oai:DiVA.org:su-87666DiVA, id: diva2:606135
Forskningsfinansiär
Swedish Research Council, 621-2007-3750
Merknad

AuthorCount:13;

Tilgjengelig fra: 2013-02-18 Laget: 2013-02-14 Sist oppdatert: 2018-01-24bibliografisk kontrollert

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Gustafsson, ErikHumborg, ChristophHägg, HannaMörth, MagnusWällstedt, Teresia
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