Articles | Volume 17, issue 9
Biogeosciences, 17, 2579–2591, 2020
https://doi.org/10.5194/bg-17-2579-2020
Biogeosciences, 17, 2579–2591, 2020
https://doi.org/10.5194/bg-17-2579-2020

Research article 15 May 2020

Research article | 15 May 2020

Reconstructing N2-fixing cyanobacterial blooms in the Baltic Sea beyond observations using 6- and 7-methylheptadecane in sediments as specific biomarkers

Jérôme Kaiser et al.

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Short summary
Cyanobacterial blooms represent a threat to the Baltic Sea ecosystem, causing deoxygenation of the bottom water. In order to understand the natural versus anthropogenic factors driving these blooms, it is necessary to study long-term trends beyond observations. We have produced a record of cyanobacterial blooms since 1860 using organic molecules (biomarkers) preserved in sediments. Cyanobacterial blooms in the Baltic Sea are likely mainly related to temperature variability.
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