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Nitrate source identification in the Baltic Sea using its isotopic ratios in combination with a Bayesian isotope mixing model
Stockholms universitet, Naturvetenskapliga fakulteten, Stockholms universitets Östersjöcentrum.
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2014 (Engelska)Ingår i: Biogeosciences, ISSN 1726-4170, E-ISSN 1726-4189, Vol. 11, nr 17, s. 4913-4924Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Nitrate (NO3-) is the major nutrient responsible for coastal eutrophication worldwide and its production is related to intensive food production and fossil-fuel combustion. In the Baltic Sea NO3- inputs have increased 4-fold over recent decades and now remain constantly high. NO3- source identification is therefore an important consideration in environmental management strategies. In this study focusing on the Baltic Sea, we used a method to estimate the proportional contributions of NO3- from atmospheric deposition, N-2 fixation, and runoff from pristine soils as well as from agricultural land. Our approach combines data on the dual isotopes of NO3- (delta N-15-NO3- and delta O-18-NO3-) in winter surface waters with a Bayesian isotope mixing model (Stable Isotope Analysis in R, SIAR). Based on data gathered from 47 sampling locations over the entire Baltic Sea, the majority of the NO3- in the southern Baltic was shown to derive from runoff from agricultural land (33-100 %), whereas in the northern Baltic, i.e. the Gulf of Bothnia, NO3- originates from nitrification in pristine soils (34-100 %). Atmospheric deposition accounts for only a small percentage of NO3- levels in the Baltic Sea, except for contributions from northern rivers, where the levels of atmospheric NO3- are higher. An additional important source in the central Baltic Sea is N-2 fixation by diazotrophs, which contributes 49-65% of the overall NO3- pool at this site. The results obtained with this method are in good agreement with source estimates based upon delta N-15 values in sediments and a three-dimensional ecosystem model, ERGOM. We suggest that this approach can be easily modified to determine NO3- sources in other marginal seas or larger near-coastal areas where NO3- is abundant in winter surface waters when fractionation processes are minor.

Ort, förlag, år, upplaga, sidor
2014. Vol. 11, nr 17, s. 4913-4924
Nationell ämneskategori
Biologiska vetenskaper Geovetenskap och miljövetenskap
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URN: urn:nbn:se:su:diva-108398DOI: 10.5194/bg-11-4913-2014ISI: 000342116000025OAI: oai:DiVA.org:su-108398DiVA, id: diva2:757527
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AuthorCount:5;

Tillgänglig från: 2014-10-22 Skapad: 2014-10-22 Senast uppdaterad: 2017-12-05Bibliografiskt granskad

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Deutsch, Barbara
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Stockholms universitets Östersjöcentrum
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Biogeosciences
Biologiska vetenskaperGeovetenskap och miljövetenskap

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