Cruise report from R/V Argos week 32, 2007

Type: Report
Author: Arne Svensson, Adil Yousif


Surface temperatures were normal throughout the area. Nutrient concentrations in the surface layer were normal for the season, except in the Arkona and Bornholm Basins where phosphate and silicate levels were higher than normal. At the Fårö Deep and western Gotland Basin, silicate concentrations were high. In the Sound and the Arkona Basin, bottom water oxygen concentrations were about 1.7 ml/l. Oxygen concentrations in the Baltic Proper were below 2 ml/l everywhere at depths exceeding 60 – 80 metres. Hydrogen sulphide was found at the bottom in the Bornholm Deep, below 125 metres in the eastern Gotland Basin and from 70 - 80 metres in the western Gotland Basin. Surface accumulations of cyanobacteria were observed in the western Baltic Proper.