European Directory of Marine Environmental Data (EDMED)

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Data set name

Algaline flow-through data set on phytoplankton and related parameters collected unattended onboard merchant ships by the FIMR (1992-)

Data holding centreFinnish Environment Institute
CountryFinland  Finland
Time periodSince 1992 to present
Geographical area

The Baltic Sea Proper and the Gulf of Finland


Phytoplankton taxonomic biomass in water bodies; Variable fluorescence parameters; Chlorophyll pigment concentrations in water bodies; Nitrate concentration parameters in the water column; Nitrite concentration parameters in the water column; Phytoplankton taxonomic abundance in water bodies; Phosphate concentration parameters in the water column; Salinity of the water column; Silicate concentration parameters in the water column; Temperature of the water column


Fluorometers; thermosalinographs; discrete water samplers


The data set has been collected in order to provide spatially and temporally extensive data for the monitoring of the phytoplankton community and algal blooms. In addition to early-warning on harmful algal blooms, the collected data is used to reveal changes in the plankton community including long-term trends and introductions of new and potentially harmful species. The data set comprises of the unattended flow-through measurements onboard several merchant ships (SOOP). The water for the sensors is pumped constantly from the surface layer (5 m) while the ships are moving. The spatial resolution of the high-frequency measurements (in vivo fluorescence of chlorophyll a, temperature, salinity) is 100-300 m along the ships' route, and the temporal frequency between transects varies from 1 to 3 days during the algal intensive growth season (March - October). Additionally, water samples (analyses of chlorophyll a, phytoplankton species composition and nutrients) are automatically collected by a refrigerated sampler at certain designated locations. The amount of water samples varies with route, e.g. on the Lubeck-Helsinki transect 24 samples are collected weekly. Preliminary quality check and calibrations have been made in transferring the data into the local data base.

OriginatorsFinnish Institute of Marine Research (FIMR)
Data web site
OrganisationFinnish Environment Institute
ContactRiitta Olsonen

Finnish Environment Institute
Mechelininkatu 34a


Telephone+358 40 182 3254
Collating centreFinnish Institute of Marine Research (FIMR)
Local identifier19001017
Global identifier2053
Last revised2009-11-24