Articles | Volume 13, issue 4
Biogeosciences, 13, 1009–1018, 2016
https://doi.org/10.5194/bg-13-1009-2016

Special issue: Effects of rising CO2 on a Baltic Sea plankton...

Biogeosciences, 13, 1009–1018, 2016
https://doi.org/10.5194/bg-13-1009-2016

Research article 23 Feb 2016

Research article | 23 Feb 2016

Changing seasonality of the Baltic Sea

Mati Kahru et al.

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Using satellite-derived data sets we have found drastic changes in the timing of the annual cycle in physical and ecological variables of the Baltic Sea over the last 30 years. The summer season starts earlier and extends longer. The period with sea-surface temperature of at least 17 ˚C has doubled; the period with high water turbidity has quadrupled. While both the phytoplankton spring and summer blooms have become earlier, the annual maximum has switched to the summer cyanobacteria bloom.
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