Baltic Sea Oxygen Maps 2000-2006

-----

Please note:

The Commission is in the process of updating some of the content on this website in light of the withdrawal of the United Kingdom from the European Union. If the site contains content that does not yet reflect the withdrawal of the United Kingdom, it is unintentional and will be addressed.

-----

Abstract: 

This practice provides the first Baltic Sea Oxygen Maps and analyses the depletion in oxygen concentration in the entire Sea and specific areas.

Sea Basin(s): 
Year: 
2007
Application in MSP: 
Unknown effect
Sectors: 
Nature protection
Type of Issue: 
Data
Type of practice: 
Tools
Stage of MSP cycle: 
Analyse spatial aspects
Cross-border / trans-national aspect: 
Yes
Coherence with other processes: 
Habitats and Birds Directive

Questions this practice may help answer

  • What methodology can be used to for producing oxygen maps for a specific sea?
  • What have been the oxygen concentrations in the years 2000 to 2006 for the entire Baltic Sea?
  • How big has the depletion been in oxygen concentrations in specific parts of the Baltic Sea between 2000 and 2006?

Implementation Context

Oxygen depletion is a major environmental problem in the Baltic Sea and Kattegat and has been so for many decades. Although many institutions and scientists have spent considerable resources on monitoring and assessment of oxygen depletion, no harmonised Baltic Sea-wide maps showing the areas of concern have ever been produced.  In this practice the first Baltic Sea Oxygen Maps have been created.

Aspects / Objectives

Present oxygen maps illustrating minimum oxygen concentrations in the bottom waters of the Baltic Sea and the transition area to the North Sea during the period 2000-2006.

Method

The methodology for producing oxygen maps for the Baltic Sea and Kattegat is combining dynamical 3D modelling with data assimilation. In this way both the actual oxygen status, as available from the sporadic profiling, and the dynamics between the profiling in space and time, as simulated by the model, are included in the description of the oxygen conditions in the area. Thus the strengths of both datasets are utilised.

Main Outputs / Results

  • The report provides many maps showing the modelled distribution of minimum bottom oxygen concentrations in the years 2000 to 2006 for the entire Baltic Sea
  • For the following areas in the Baltic Sea conclusions have been drawn considering oxygen depletion in the years 2000-2006:
    • Skaggerrak
    • Kattegat
    • Belt Sea and The Sound
    • Arkona Basin
    • Bornholm Basin
    • Bay of Gdansk
    • Eastern Baltic Proper
    • Western Gotland Basin
    • Gulf of Riga
    • Gulf of Finland
    • Åland Sea
    • Bothnian Sea
    • Bothnian Bay

Transferability

This practice refers to a specific geographical area and the findings are therefore non-transferrable.  However, the methodology used for producing oxygen maps for the Baltic Sea and Kattegat, combining dynamical 3D modelling with data assimilation, could also be used in other studies.

Costs / Funding Source

Interreg IIIB Baltic Sea Region

Responsible Entity

Ian Sehested Hansen

DHI Water – Environment –Health, Agern Allé 5, 2970 Hørsholm Denmark, phone: +45 4516 9200, Fax: +45 4516 9292 , e-mail: dhi@dhigroup.com  

Share

Print