European Directory of Marine Environmental Data (EDMED)

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General
Data set name

Time series of chlorophyll and primary production in Danish waters (1953 onwards)

Data holding centreAarhus University, Department of Bioscience, Marine Ecology Roskilde
CountryDenmark  Denmark
Time periodFrom 1953 onwards (Gaps 1958 - 1965 and 1971 - 1974)
OngoingYes
Geographical area

Kattegat: 56° 50'N, 12° 00'E; Great Belt: 55° 20'N, 11° 00'E

Observations 
Parameters

Variable fluorescence parameters; Primary production in the water column; Phytoplankton growth

Description 
Summary

Measurements of the daily phytoplankton primary production were made 6-18 times per year at 2 stations in the Kattegat and Belt Sea, respectively, with the 14C-method. Until 1970 the measurements were made in situ from lightships; thereafter in artificial light incubators aboard research vessels with water samples from different depths within the euphotic zone. The data have been used to establish time series of yearly production or average production in the summer period July - September. These time series have shown an increase in the production from the 1950s to the end of the 1970s due to a general increase in nutrient (nitrate) load, and a further increase in the 1980s due to increased precipitation and land run off in the 1980s. Since 1975 about 10 stations in the Sound, Kattegat, Belt Sea and western Baltic Proper have been included in the programme. Chlorophyll-a has been measured since 1975.

OriginatorsAarhus University, Department of Bioscience, Marine Ecology Aarhus
Aarhus University, Department of Bioscience, Marine Ecology Roskilde
Danish Institute for Fisheries Research, Dept. of Marine Fisheries
University of Aarhus, Institute of Bioscience, Dept. of Microbial Biology
University of Copenhagen, Department of Biology, Phycology section
University of Copenhagen, Freshwater Biological Laboratory
University of Copenhagen, Marine Biological Laboratory
University of Southern Denmark, Institute of Biology
Data web sitehttp://mads-en.dmu.dk
Availability 
OrganisationAarhus University, Department of Bioscience, Marine Ecology Roskilde
AvailabilityOrganisation; unrestricted
ContactPeter Henriksen (Senior researcher)
Address

Aarhus University, Department of Bioscience, Marine Ecology Roskilde
399 Frederiksborgvej P.O. Box 358
Roskilde

DK-4000
Denmark

Telephone+45 46 30 12 00
Facsimile+45 46 30 12 11
Emailpet@dmu.dk
Administration 
Collating centreAarhus University, Department of Bioscience, Marine Ecology Roskilde
Local identifier13032003
Global identifier1117
Last revised2009-03-17