Our research about eutrophication

Eutrophication is the anthropogenic pressure with the greatest effect on the Baltic Sea ecosystem. Research about nutrient enrichment is an area where we are particularly strong, both at a coastal scale and for the Baltic Sea as a whole.

One main research focus is eutrophication of the Baltic Sea and its catchment. We investigate nutrient pathways in various watersheds and estuaries of the Baltic and, large-scale phosphorus and oxygen dynamics in the sea, and assess the environmental status of the Baltic.

At the Baltic Sea Centre we have strong experience and in-house expertise in the relevant fields of geochemistry, biogeochemistry, oceanography, modelling, biology, agronomy, and systems ecology. Many of our experts also participate in successful international projects that address issues related to eutrophication.

Below is a list of projects.

Films, reports and news on eutrophication can be found here!

Läs om detta på svenska

BNI logga

Baltic Nest Institute

Our researchers and technicians within Baltic Nest Institute (BNI) continuously develop and improve the model-tool that is used as basis for the eutrophication parts of the Baltic Sea Action Plan (BSAP).

manure fertilizer experiments

Evaluating fertilizer products

This project is looking into how the solid fraction of pig manure can be upgraded to a more stable, economically transportable and nutrient rich organic fertilizer.



BNIs main role within COCOA is to provide a database with basic information of all coastal areas in the Baltic, and help quantifying processes that transform and accumulate nutrients.

BONUS logo


The modelling capacity of the decision support system Nest, will in this BONUS-project, be combined with knowledge about genetic information that is linked to various ecosystem processes, such as denitrification.



BACC II offers new and updated scientific findings in regional climate research for the Baltic Sea basin. We participate in the project that consists of researchers from 141 countries, and have especially contributed to this book with the chapter on 'Environmental Impacts—Freshwater Biogeochemistry' (p. 307-336).

Better manure-management

Manure management

This project will investigate how different manure management scenarios could affect the Baltic Sea environment and provide a useful basis for decisions.  Improved manure management could reduce nutrient pressure on the Baltic Sea.

Asköforskning vid B1

Nutrients in the Bothnian Sea

The oxygen levels in the deep waters of the Bothnian Sea are not as alarming as in the Baltic Proper, but a gradual decrease in the levels is occuring even there. This project will evaluate how this change will effect the nutrient balance.

Cyanobacterial bloom

The phosphorous regulation by cyanos

This project will evaluate which conclusions could be drawn from existing data about the connections between access of phosphate and the cyanobacterial blooms.


Long-time data from Landsort

By analysing data from the monitoring station BY31, this project will investigate the factors that affect the phytoplankton production.


Seabased measures

This project aims at synthesising existing knowledge and describe potential, risks and relevant scales for measures to reduce eutrophication to the Baltic Sea. Baltic Eye will, in collaboration with international experts, suggest a framework for the scientific questions to address.

We offer ground resources ...

One of the Baltic Centre's main tasks is to provide, develop and maintain expensive physical and financial resources for marine research.

... and convey useful knowledge

Another important task is to make research results and information available for those who work with management as well as and other interested parties.