Cruise report from R/V Aranda week 49-50, 2016

Type: Report
Author: Martin Hansson


In large parts of the deep water in the Baltic Proper the oxygen concentrations were found to be around 0 ml/l, but no high concentrations of hydrogen sulphide was found. Though, in the Western Gotland Basin, hydrogen sulphide was found from depth exceeding 80 meters. Acute hypoxia, < 2 ml/l was found in all basins from 60-70 meters depths in the Baltic Proper. In Skagerrak and Kattegat all nutrients were lower than normal in the whole upper part of the water column. The opposite was found in the Baltic Proper were all nutrients were elevated to concentrations over or much over normal levels for the season. The surface water temperature was lower than normal in the Western, Northern and Eastern Gotland Basin and the surface salinity was higher than normal in the Eastern Gotland Basin. In remaining areas normal salinities and temperatures were found.