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Projected 21st century decrease in marine productivity : a multi-model analysis

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dc.contributor.author Steinacher, M.
dc.contributor.author Joos, Fortunat
dc.contributor.author Frolicher, T. L.
dc.contributor.author Bopp, Laurent
dc.contributor.author Cadule, P.
dc.contributor.author Cocco, V.
dc.contributor.author Doney, Scott C.
dc.contributor.author Gehlen, M.
dc.contributor.author Lindsay, Keith
dc.contributor.author Moore, J. Keith
dc.contributor.author Schneider, B.
dc.contributor.author Segschneider, J.
dc.date.accessioned 2010-04-19T18:17:06Z
dc.date.available 2010-04-19T18:17:06Z
dc.date.issued 2010-03-11
dc.identifier.citation Biogeosciences 7 (2010): 979-1005 en_US
dc.identifier.uri http://hdl.handle.net/1912/3248
dc.description © Authors, 2010. This work is distributed under the Creative Commons Attribution 3.0 License. The definitive version was published in Biogeosciences 7 (2010): 979-1005, doi: 10.5194/bg-7-979-2010 en_US
dc.description.abstract Changes in marine net primary productivity (PP) and export of particulate organic carbon (EP) are projected over the 21st century with four global coupled carbon cycle-climate models. These include representations of marine ecosystems and the carbon cycle of different structure and complexity. All four models show a decrease in global mean PP and EP between 2 and 20% by 2100 relative to preindustrial conditions, for the SRES A2 emission scenario. Two different regimes for productivity changes are consistently identified in all models. The first chain of mechanisms is dominant in the low- and mid-latitude ocean and in the North Atlantic: reduced input of macro-nutrients into the euphotic zone related to enhanced stratification, reduced mixed layer depth, and slowed circulation causes a decrease in macro-nutrient concentrations and in PP and EP. The second regime is projected for parts of the Southern Ocean: an alleviation of light and/or temperature limitation leads to an increase in PP and EP as productivity is fueled by a sustained nutrient input. A region of disagreement among the models is the Arctic, where three models project an increase in PP while one model projects a decrease. Projected changes in seasonal and interannual variability are modest in most regions. Regional model skill metrics are proposed to generate multi-model mean fields that show an improved skill in representing observation-based estimates compared to a simple multi-model average. Model results are compared to recent productivity projections with three different algorithms, usually applied to infer net primary production from satellite observations. en_US
dc.description.sponsorship This work was funded by the European Union projects CARBOOCEAN (511176-2) and EUROCEANS (511106-2) and is a contribution to the “European Project on Ocean Acidification” (EPOCA) which received funding from the European Community’s Seventh Framework Programme (FP7/2007–2013) under grant agreement no. 211384. Additional support was received from the Swiss National Science Foundation. SCD acknowledges support from the NASA Ocean Biology and Biogeochemistry Program (NNX07AL80G). LB aknowledges support from the EU Project MEECE (Marine Ecosystem Evolution in a Changing Environnement, grant agreement 212085). en_US
dc.format.mimetype application/pdf
dc.language.iso en en_US
dc.publisher Copernicus Publications on behalf of the European Geosciences Union en_US
dc.relation.uri http://dx.doi.org/10.5194/bg-7-979-2010
dc.rights.uri http://creativecommons.org/licenses/by/3.0/ *
dc.title Projected 21st century decrease in marine productivity : a multi-model analysis en_US
dc.type Article en_US
dc.identifier.doi 10.5194/bg-7-979-2010


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