Data access is partially supported by JericoNEXT EU-project.

SYKE Alg@line network in the Baltic Sea monitors the state of the sea and detects algal blooms. Several millions of data points are collected annually from the Baltic Sea, using a fleet of ferries operated by shipping companies.

Ferries are equipped with flow-through systems (usually called 'Ferryboxes') with spatial measurement resolution of about 200 m. The data recording has the geo-reference logging from GPS. Ferryboxes incorporate a thermosalinograph, chlorohyll, phycocyanin and CDOM fluorometers, turbidity meter and refrigerated sampling unit providing discrete water samples for laboratory analyses (e.g. microscopy, FlowCAM, nutrients, optical analysis, and experimental work).

Additional flow-through sensors e.g. for primary production (FRRF) and light reflectance are used periodically, new sensors for light absorption and pCO2 will be implemented in 2015. One of the Algaline routes (Helsinki-Stockholm) passes approximately 10 km south of the Atmospheric and Marine Research Station Utö.

Currently 3 ferryboxes are operated by SYKE Marine Research Center, partly in collaboration with Finnish and international parties:

- FINNMAID (Finnlines) cruising between Helsinki-Travemünde twice a week (Partner: IOW, Germany).
- SILJA SERENADE (Tallink) is cruising between Helsinki and Stockholm daily (Partners: City of Helsinki, Finland; Uusimaa Ely Centre, Finland).
- TRANSPAPER (TransAtlantic) from Kemi to Gothenburg weekly (Partner: SMHI, Sweden).

Ferrybox data is available through EMODnet chemistry and Copernicus Marine Environment Monitoring Service.


Contact person:

Dr. Seppo Kaitala
e-mail  firstname.surname (at)
Marine Research Centre, SYKE


FINNMAID: Helsinki - Travemünde
SILJA SERENADE: Helsinki - Stockholm
TRANSPAPER: Kemi - Gothenburg

Currently operational Ferrybox lines
(click photos for on-line data)