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Projected climate change impact on Baltic Sea cyanobacteria Climate change impact on cyanobacteria
SMHI, Research Department, Oceanography.ORCID iD: 0000-0003-1068-746X
2013 (English)In: Climatic Change, ISSN 0165-0009, E-ISSN 1573-1480, Vol. 119, no 2, 391-406 p.Article in journal (Refereed) Published
Abstract [en]

Compared to other phytoplankton groups, nitrogen-fixing cyanobacteria generally prefer high water temperatures for growth and are therefore expected to benefit from global warming. We use a coupled biological-physical model with an advanced cyanobacteria life cycle model to compare the abundance of cyanobacteria in the Baltic Sea during two different time periods (1969-1998; 2069-2098). For the latter, we find prolonged growth and a more than twofold increase in the climatologically (30 years) averaged cyanobacteria biomass and nitrogen fixation. Additional sensitivity experiments indicate that the biological-physical feedback mechanism through light absorption becomes more important with global warming. In general, we find a nonlinear response of cyanobacteria to changes in the atmospheric forcing fields as a result of life-cycle related feedback mechanisms. Overall, the sensitivity of the cyanobacteria-driven system suggests that biological-physical and life-cycle related feedback mechanisms are important and must therefore be included in future projection studies.

Place, publisher, year, edition, pages
2013. Vol. 119, no 2, 391-406 p.
Keyword [en]
Cyanobacteria, Climate change, Life cycle, N-2-fixation, Phytoplankton, Biological-physical feedback mechanisms
National Category
Oceanography, Hydrology, Water Resources
Research subject
Oceanography
Identifiers
URN: urn:nbn:se:smhi:diva-365DOI: 10.1007/s10584-013-0702-yISI: 000321955100014OAI: oai:DiVA.org:smhi-365DiVA: diva2:801803
Available from: 2015-04-10 Created: 2015-03-31 Last updated: 2016-04-12Bibliographically approved

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