Cruise report from R/V Aranda week 12, 2014

Type: Report
Author: Anna-Kerstin Thell


In the Skagerrak and Kattegat, surface nutrient was normal for the season in most of the investigated places. In the Baltic Proper, except the Arkona Basin, the concentrations of phosphate and silicate were higher than normal. The oxygen concentrations in the bottom water in the Hanö Bight and the Bornholm Basin had increased since the last measurement and were above acute hypoxia. In the Western, Northern and northern part of Eastern Gotland Basins the oxygen situation was unchanged. At the station BY15 Gotland Deep you could see decreased concentration of hydrogen sulphite. Oxygen free conditions, anoxia, were found from 100 – 125 meters depth and acute hypoxia from 70 – 90 meters depth in the Western, Northern and Eastern Gotland Basins. The spring bloom was ongoing in the Western part of Skagerrak and in the Southern part of Baltic Proper.