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Getting the measure of eutrophication in the Baltic Sea: towards improved assessment principles and methods
SMHI, Research Department, Oceanography.
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2011 (English)In: Biogeochemistry, ISSN 0168-2563, E-ISSN 1573-515X, Vol. 106, no 2, 137-156 p.Article in journal (Refereed) Published
Abstract [en]

The eutrophication status of the entire Baltic Sea is classified using a multi-metric indicator-based assessment tool. A total of 189 areas are assessed using indicators where information on reference conditions (RefCon), and acceptable deviation (AcDev) from reference condition could be combined with national monitoring data from the period 2001-2006. Most areas (176) are classified as 'affected by eutrophication' and only two open water areas and 11 coastal areas are classified as 'unaffected by eutrophication'. The classification is made by application of the recently developed HELCOM Eutrophication Assessment Tool (HEAT), which is described in this paper. The use of harmonized assessment principles and the HEAT tool allows for direct comparisons between different parts of the Baltic Sea despite variations in monitoring activities. The impaired status of 176 areas is directly related to nutrient enrichment and elevated loads from upstream catchments. Baltic Sea States have implemented nutrient management strategies since years which have reduced nutrient inputs. However, eutrophication is still a major problem for large parts of the Baltic Sea. The 2007 Baltic Sea Action Plan is projected to further reduce nutrient inputs aiming for a Baltic Sea unaffected by eutrophication by 2021.

Place, publisher, year, edition, pages
2011. Vol. 106, no 2, 137-156 p.
Keyword [en]
Eutrophication, Baltic Sea, Assessment, HEAT, Nutrients, Ecological status, Nutrient management strategies
National Category
Oceanography, Hydrology, Water Resources
Research subject
Oceanography
Identifiers
URN: urn:nbn:se:smhi:diva-503DOI: 10.1007/s10533-010-9508-4ISI: 000297224800002OAI: oai:DiVA.org:smhi-503DiVA: diva2:806244
Available from: 2015-04-20 Created: 2015-04-15 Last updated: 2016-01-22Bibliographically approved

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