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The expedition was included within SLU s International Bottom Trawl Survey and covered the Skagerrak and Kattegat. Mapping of winter nutrient conditions was performed in the Skagerrak and 13 stations with complete hydrography were sampled. In the Kattegat area 12 stations were sampled with complete Last updated: Mar 10, 2016

National Board of Fisheries Principal SMHI SUMMARY The expedition was included within the National Board of Fisheries International Bottom Trawl Survey and covered the Skagerrak and the Kattegat. In the Skagerrak, 10 stations with complete hydrography were taken. In the Kattegat mapping of oxygen Last updated: Apr 23, 2014

Open access to SMHI data Information in English on , , , and . Hydrology Hydrology data for water flow, water circulation and transport of nutrients are available at . The web sites contain both observed and model calculated data. All data are free to use and download. . Climate Scenario Data The Last updated: Jan 10, 2023

in the Skagerrak were partly caused by the fish killing genus Pseudochattonella*. The integrated (0-20m) chlorophyll concentrations were normal for this month. A typical post spring bloom situation was found in the Baltic, with some diatom and dinoflagellate species, ciliates, cyanobacteria colonies Last updated: May 09, 2016

Surface water temperatures were normal in the Skagerrak and Kattegat, but above normal in the Baltic Proper. Nutrient concentrations were normal in the whole investigated area. In the main part of the Baltic Proper oxygen concentrations below 2 ml/l were observed at depths exceeding 70 to 80 meters Last updated: Apr 23, 2014

is that increasing precipitation levels that cause a corresponding increase in discharge from rivers in the north are going to reduce algal growth by making sea water browner and more nutrient-poor. All in all, these changes are expected to lead to a decrease in fish production in the northern Last updated: Mar 20, 2017

well as with authorities in Germany and Poland. A 1-3 m thick surface layer in the western part of the Pomeranian Bay was strongly influenced by the water from the Oder. The water from the Wisla influenced the the western part of the Bay of Gdansk. In these waters there were elevated levels of Last updated: Apr 23, 2014

Marine Strategy Directive . Products combining satellite data with in-situ observations should be developed. These automated systems augment monitoring using research vessels but do not replace it. SMHI, the Swedish Institute for the Marine Environment, the Swedish Water Authorities, the Swedish Last updated: Apr 23, 2014

In Skagerrak and the north Kattegat the spring bloom was ongoing and the amount of nutrients was low. The southern parts of the Kattegat and the Sound were influenced by outflowing winter water from the Baltic with high concentrations of nutrients. In the Baltic Proper winter conditions prevailed Last updated: Apr 23, 2014

Remnants of the spring bloom were found in the surface water at both stations in the Skagerrak. The chlorophyll fluorescence maxima indicated that the bloom was sinking down considering they were found at approximately 15 meters. Diatoms dominated in the surface water and Skeletonema marinoi and Last updated: Apr 23, 2014