Effects of sea ice and wind speed on phytoplankton spring bloom in central and southern Baltic Sea

Last modified: 
March 16, 2021 - 2:10pm
Type: Journal Article
Year of publication: 2021
Date published: 03/2021
Authors: Ove Pärn, Gennadi Lessin, Adolf Stips
Journal title: PLOS ONE
Volume: 16
Issue: 3
Pages: e0242637

In this study, the effects of sea ice and wind speed on the timing and composition of phytoplankton spring bloom in the central and southern Baltic Sea are investigated by a hydrodynamic–biogeochemical model and observational data. The modelling experiment compared the results of a reference run in the presence of sea ice with those of a run in the absence of sea ice, which confirmed that ecological conditions differed significantly for both the scenarios. It has been found that diatoms dominate the phytoplankton biomass in the absence of sea ice, whereas dinoflagellates dominate the biomass in the presence of thin sea ice. The study concludes that under moderate ice conditions (representing the last few decades), dinoflagellates dominate the spring bloom phytoplankton biomass in the Baltic Sea, whereas diatoms will be dominant in the future as a result of climate change i.e. in the absence of sea ice.

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