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This report covers the Baltic Proper only as this expedition is reporting from the Finish cruise. All analyses have been performed onboard the ship and the main focus was to follow the cyanobacterial surface accumulations and blooms. Summary of surface accumulations The warm air temperature and the Last updated: Aug 10, 2015

community. The Baltic Sea Fig.5 All three groups of filamentous cyanobacteria were found at all stations in the Baltic Sea but in different proportions. The small curly filaments belong to the genus Dolichospermum. The large curly filament with light streaks in the middle is the toxin producing Nodularia Last updated: Jul 19, 2017

In the coastal area of the Skagerrak the nutrient- and cell concentrations were low compared to the open Skagerrak where the diatom spring bloom was ongoing. In the Baltic Sea the cell density was generally low but at the Arkona Basin the spring bloom had started. The integrated (0-10 m Last updated: Apr 01, 2015

spring bloom. The diversity and cell concentrations in the Baltic Sea were low at all stations. The diatom Skeletonema marinoi was found in high numbers at the eastern stations whereas small flagellates dominated at the other stations. The integrated (0-10 m) chlorophyll a concentrations were low which Last updated: Mar 09, 2016

Baltic Sea, filamentous cyanobacteria were abundant and surface accumulations were observed at REF M1V1, BY15 and at BY32. The dinoflagellate Prorocentrum minimum* was abundant at several stations, the highest cell number was found at BY15. The integrated chlorophyll a concentrations (0-10 meters) were Last updated: Oct 04, 2016

* had reached N14 Falkenberg with the Baltic current. However, the high salinity in the area prevents the blooms that occur in the Baltic Sea during summer. The integrated chlorophyll concentrations were within normal for this month. Threadlike cyanobacteria were still numerous at many of the Baltic Last updated: Sep 15, 2016

All phytoplankton samples from the Skagerrak, the Kattegat and the Baltic Sea had low species diversities. All of the cell counts were low. No further detailed phytoplankton information will be presented in this report, only species lists and the chlorophyll diagrams. Last updated: Jan 25, 2016

. A rare and beautiful species, Pyramimonas longicauda was present, Fig 1. Släggö (Skagerrak coast) 4th of September The phytoplankton situation was similar to the one at Å17. One exception was that a diatom typical for the North Sea, Pseudosolenia calcar-avis, was common. One of the least common Last updated: Sep 18, 2015

on the cyanobacteria dominating in the Baltic bloom. The method used here is not the best for other plankton groups, nevertheless all organisms observed are reported. To follow the surface accumulations of cyanobacteria in the Baltic Sea by satellite interpretations http //www Last updated: Aug 28, 2014

A joint Swedish-Finnish sea-ice experiment was performed during March 1977. Measurements in the atmosphere, ice and sea were made during six days onboard the Finnish Research vessel Aranda stationed in the ice field in the Bay of Bothnia. During two days measurements were also carried out from the Last updated: Aug 02, 2019