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European Directory of Marine Environmental Data (EDMED)

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Data set name

Phytoplankton Chlorophyll a Data Set of the Baltic Sea

Data holding centreDepartment of Marine Research of the Environmental Protection Agency
CountryLithuania  Lithuania
ProjectImplementation of the EU Water Framework Directive, Meeting 2006 deadlines(not provided); Implementation of the EC-WFD in the transboundary river basin management, Republic of Lithuania - Russian Federation(WFD Lithuania/Kaliningrad); The Water Framework Directive Implementation in Lithuania(not provided)
Time period1983 -1992
Geographical area

Baltic proper, Northern Baltic Sea, Gotland Basin, Bornholm Basin, Arkona Sea during the period 1983-1992 (data set limits: 54 39 - 56 02N; 14 05 - 21 05E)


Chlorophyll pigment concentrations in water bodies




The amount of the chlorophyll a is an important characteristic of the phytoplankton photosynthesis activity which helps to determine the amounts of phytoplankton biomass and the trophic level of a water body. The aim of the research was to determine water trophic (biological productivity) level of the Baltic Sea and evaluate its long-term and seasonal variations. Since 1983 seasonal investigations of phytoplankton were carried out in a wide net of stations in the national (Lithuanian territorial and economic waters) and international (Baltic Proper) waters. The samples were taken from the surface water layer, also integrated samples from the depths 0,5; 2,5; 5,0; 7,5; 10; 15; 20 and 30 m were taken in the international stations. The analyses of chlorophyll a were performed according to methods recommended by HELCOM. The data are fully quality controlled. Systematic certification of laboratories, participation in international intercalibrations, internal control, introduced managing system for researches' quality, use of high quality reagents determine quality of data. All data is stored in archive (written form) and the data from 1992 also is saved on hard disk.

OriginatorsDepartment of Marine Research of the Environmental Protection Agency
OrganisationDepartment of Marine Research of the Environmental Protection Agency
ContactEgle Supiniene (Head of Hydrobiology Department)

Department of Marine Research of the Environmental Protection Agency
Taikos Av. 26


Telephone+370 46 41 04 52
Facsimile+370 46 41 04 60
Collating centreDepartment of Marine Research of the Environmental Protection Agency
Local identifier33001031
Global identifier2113
Last revised2009-02-07