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Nitrogen speciation and nitrification potential in the Skagerrak area during the SKAGEX IV experiment
SMHI, Research Department, Oceanography.
1996 (English)In: Deep Sea Research Part I: Oceanographic Research Papers, ISSN 0967-0637, E-ISSN 1879-0119, Vol. 43, no 7, 1029-1044 p.Article in journal (Refereed) Published
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Abstract [en]

Nitrification was studied in relation to the inorganic nitrogen species in the Skagerrak in May 1991 during the SKAGEX IV expedition. The distribution of density, ammonium, nitrite and nitrate are shown for the four north-south sections and, for two of these, the distribution of nitrification potential (NP, i.e. nitrification with excess ammonium during incubation) and oxygen saturation values are also presented. Highly saline and ammonium rich Atlantic/North Sea water was sinking into the Skagerrak along the Danish slope, where it gradually mixed with the ''old'' and relatively stagnant Skagerrak water with high nitrate concentrations but very low ammonium concentrations. The zone of mixing was characterised by high concentrations of nitrite, an intermediate product during the,bacterial oxidation of ammonium to nitrate. The NP rates were in the range 0-60 nmoll(-1) day(-1). Water masses with undetectable or low NP included the upper water layers and water flowing in at depth. Maximum NP rates were found in or near the zone with high nitrite concentrations just below the upper layers and at the border between inflowing water and ''old'' Skagerrak water at depth. It is postulated that nitrification was stimulated in the mixture of inflowing, ammonium rich water and ''old'' Skagerrak water. Copyright (C) 1996 Elsevier Science Ltd.

Place, publisher, year, edition, pages
GOTHENBURG UNIV,DEPT ANALYT & MARINE CHEM,S-41296 GOTHENBURG,SWEDEN. CHALMERS UNIV TECHNOL,S-41296 GOTHENBURG,SWEDEN. SMHI,OCEANOG LAB,S-42671 VASTRA FROLUNDA,SWEDEN., 1996. Vol. 43, no 7, 1029-1044 p.
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Oceanography, Hydrology, Water Resources
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Oceanography
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URN: urn:nbn:se:smhi:diva-1639DOI: 10.1016/0967-0637(96)00050-7ISI: A1996VV03300005OAI: oai:DiVA.org:smhi-1639DiVA: diva2:897751
Available from: 2016-01-26 Created: 2015-12-22 Last updated: 2016-04-04Bibliographically approved

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