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The surface area of the Kattegat and the Skagerrak, located in the eastern North Sea, is about 22 000 km2 and 32 000 km2, and the mean depth is about 23 m and 210 m, respectively. The Skagerrak and the Kattegat forms the inner end of the Norwegian trench, which has the characteristics of a deep Last updated: Apr 23, 2014

The surface area of the Kattegat and the Skagerrak, located in the eastern North Sea, is about 22 000 km2 and 32 000 km2, and the mean depth is about 23 m and 210 m, respectively. The Skagerrak and the Kattegat forms the inner end of the Norwegian trench, which has the characteristics of a deep Last updated: Apr 23, 2014

Surface temperatures in the Skagerrak, the Kattegat and in the Baltic were normal. The nutrients showed, for the season, mostly normal values. The salinity of the surface water in the Skagerrak and the Kattegat was normal. Oxygen concentrations below 2 ml/l were found at depths greater than 80 Last updated: Apr 23, 2014

summarized in the Appendix. At the Huvudskär ocean buoy a reference CTD cast was taken. Analysis of plankton samples are presented in the separate plankton report "AlgAware" which is published on SMHI's website shortly after the expedition. https //www.smhi.se/en/publications/algal-situation-reports-2 Last updated: Jun 25, 2019

During the expedition, which is part of the Swedish national marine monitoring program, Skagerrak, Kattegat, Öresund, the Baltic Proper, was visited. The weather was sunny and mostly calm. Several surface accumulations of cyanobacteria were observed in the Baltic Sea. During the expedition, live Last updated: Jul 21, 2019

A3-dimensional baroclinic model of the North Sea and the Baltic Sea, designed for a daily operational use is described in detail. The model is based on a similar model running in operational mode at the German Federal Maritime and Hydrographic Agency (BSH) in Hamburg, Germany. The operational Last updated: Apr 23, 2014

blooms were observed in any of the sea areas. Last updated: Apr 23, 2014

The surface water temperatures were normal for the whole area. The nutrient concentrations were low in all sea areas, which is normal for the season due to the ongoing algal blooms. Oxygen concentrations below 2 ml/l were found on depths under 80 m in the Western and Eastern Gotland Basin, and Last updated: Apr 23, 2014

Weak winds from the north dominated. The surface water temperatures were normal for the season in the whole area i.e. about 6°C in the Skagerak, 6.5°C in the Kattegat and between 5 and 3°C in the Baltic. Water of high nitrate content (20 mM) was found north of Jylland (station HS5). In the Kattegat Last updated: Apr 23, 2014

The weather was mostly cloudy and hazy. Moderate to strong winds from the west dominated. The surface water temperatures were normal for the season in the whole area i.e. about 5°C in the Skagerrak, 3°C in the Kattegat and between 2 and 4°C in the Baltic. The spring bloom in the Kattegat continued Last updated: Apr 23, 2014