Document Detail

Denitrification in the river estuaries of the northern Baltic Sea.
MedLine Citation:
PMID:  17520925     Owner:  NLM     Status:  MEDLINE    
Estuaries have been suggested to have an important role in reducing the nitrogen load transported to the sea. We measured denitrification rates in six estuaries of the northern Baltic Sea. Four of them were river mouths in the Bothnian Bay (northern Gulf of Bothnia), and two were estuary bays, one in the Archipelago Sea (southern Gulf of Bothnia) and the other in the Gulf of Finland. Denitrification rates in the four river mouths varied between 330 and 905 micromol N m(-2) d(-1). The estuary bays at the Archipelago Sea and the Gulf of Bothnia had denitrification rates from 90 micromol N m(-2) d(-1) to 910 micromol N m(-2) d(-1) and from 230 micromol N m(-2) d(-1) to 320 micromol N m(-2) d(-1), respectively. Denitrification removed 3.6-9.0% of the total nitrogen loading in the river mouths and in the estuary bay in the Gulf of Finland, where the residence times were short. In the estuary bay with a long residence time, in the Archipelago Sea, up to 4.5% of nitrate loading and 19% of nitrogen loading were removed before entering the sea. According to our results, the sediments of the fast-flowing rivers and the estuary areas with short residence times have a limited capacity to reduce the nitrogen load to the Baltic Sea.
Hanna Silvennoinen; Susanna Hietanen; Anu Liikanen; C Florian Stange; Rolf Russow; Jorma Kuparinen; Pertti J Martikainen
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Ambio     Volume:  36     ISSN:  0044-7447     ISO Abbreviation:  Ambio     Publication Date:  2007 Apr 
Date Detail:
Created Date:  2007-05-24     Completed Date:  2007-07-31     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0364220     Medline TA:  Ambio     Country:  Sweden    
Other Details:
Languages:  eng     Pagination:  134-40     Citation Subset:  IM    
Department of Environmental Sciences, University of Kuopio, Research and Development Unit of Environmental Health, Finland.
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MeSH Terms
Baltic States
Environmental Monitoring*
Nitrites / metabolism*
Nitrogen / metabolism
Nitrous Oxide / metabolism*
Oceans and Seas
Oxygen / metabolism
Risk Assessment
Time Factors
Water Movements
Water Pollutants / metabolism*
Reg. No./Substance:
0/Nitrites; 0/Water Pollutants; 10024-97-2/Nitrous Oxide; 7727-37-9/Nitrogen; 7782-44-7/Oxygen

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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