Expeditionsrapport från U/F Argos vecka 4, 1996

Typ: Rapport
Författare: Bodil Thorstensson


The surface temperature in central Skagerrak (station M6) was about 6.2°C which is higher than normal, while at station P2 in the south-east the temperature was ca. 0.3°C, much lower than normal. Also in the Kattegat the surface temperature was low. In the Sound there was a sharp gradient in both temperature and salinity at about 10 m. In the Baltic the upper water masses had been mixed, the temperature showed a more or less continuous increase with depth. The temperature of the surface water was between 2-3°C. The oxygen concentrations in the Kattegat deep water were at the normal winter levels. Hydrogen sulphide was found at the Bornholm deep from 80-85 m. The bottom water of the Gotland deep indicated hydrogen sulphide. The phosphate concentrations were lower than normal in the surface layers of the Skagerrak, the Kattegat and the Baltic. The silicate concentrations of the surface layer in the southern Baltic were less than half of the normal values. However, at P2 in the Skagerrak the silicate concentration was high in comparison with the monthly means.