Option 1: Annual report;
option 2: extra reports;
option 3: collection of pteropod;
option 4: analysis of pteropod;
option 5: continual measurements at station M;
option 6: analysis of water samples from two extra missions on the stretches Oslo towards Kiel and Tromsø-Longyearbyen;
option 7: increased frequency of water column stations in the study areas;
option 8: sample taking at the coral reef by Tisler;
option 9: analysis of sea acidification parameters at several ECO-COAST stations;
option 10: collection of water samples for analysis of micro-plastic;
option 11: water column missions in the North Sea;
option 12: several missions in the existing water column section;
option 13: several continual measuring platforms;
option 14: extra water column stations in the coastal zone;
option 15: extra water samples from the surface;
option 16: field work at station IsG in Isfjorden;
option 17: continuous measurements of coloured dissolved organic matter (cDOM).