Cruise report from R/V Argos week 24, 2013

Type: Report
Author: Bodil Thorstensson


Surface water temperature was higher than normal in the Skagerrak, northern Kattegat and southern Baltic. Salinities at Anholt E, P2, Å13 and Å15, were lower than normal, due to a strong outflow from the Baltic. Phosphorus concentrations in the Arkona Basin, the Sound and southern Kattegat remain elevated. All dissolved inorganic nitrogen (DIN) had been consumed in the surface water at all stations. High silicate concentrations were found in the Kattegat. Oxygen levels below 2 ml/l were found at depths greater than 70-80 metres throughout the Baltic Proper. The bottom water in the Arkona basin was well oxygenated. Hydrogen sulphide was found in the eastern Gotland basin from 125-150 metres, and in the western Gotland basin and at Christiansö (Bornholm Basin) from 90 metres. High chlorophyll fluorescence was observed at 15 metres in the central Skagerrak, and at 20 metres at Laso E.