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dc.contributor.authorPaulsen, Maria Lund
dc.contributor.authorSeuthe, Lena
dc.contributor.authorReigstad, Marit
dc.contributor.authorLarsen, Aud
dc.contributor.authorCape, Matthias
dc.contributor.authorVernet, Maria
dc.date.accessioned2019-02-27T14:02:55Z
dc.date.available2019-02-27T14:02:55Z
dc.date.issued2018-11-15
dc.description.abstractNitrogen (N) is the main limiting nutrient for biological production in the Arctic Ocean. While dissolved inorganic N (DIN) is well studied, the substantial pool of N bound in organic matter (OM) and its bioavailability in the system is rarely considered. Covering a full annual cycle, we here follow N and carbon (C) content in particulate (P) and dissolved (D) OM within the Atlantic water inflow to the Arctic Ocean. While particulate organic carbon (POC), particulate organic nitrogen (PON), and dissolved organic carbon (DOC) accumulated in the surface waters from January to May, the dissolved organic nitrogen (DON)-pool decreased substantially (Δ – 50 μg N L-1). The DON reduction was greater than the simultaneous reduction in DIN (Δ – 30 μg N L-1), demonstrating that DON is a valuable N-source supporting the growing biomass. While the accumulating POM had a C/N ratio close to Redfield, the asynchronous accumulation of C and N in the dissolved pool resulted in a drastic increase in the C/N ratio of dissolved organic molecules (DOM) during the spring bloom. This is likely due to a combination of the reduction in DON, and a high release of carbon-rich sugars from phytoplankton, as 32% of the spring primary production (PP) was dissolved. Our findings thus caution calculations of particulate PP from DIN drawdown. During post-bloom the DON pool increased threefold due to an enhanced microbial processing of OM and reduced phytoplankton production. The light absorption spectra of DOM revealed high absorption within the UV range during spring bloom indicating DOM with low molecular weight in this period. The absorption of DOM was generally lower in the winter months than in spring and summer. Our results demonstrate that the change in ecosystem function (i.e., phytoplankton species and activity, bacterial activity and grazing) in different seasons is associated with strong changes in the C/N ratios and optical character of DOM and underpin the essential role of DON for the production cycle in the Arctic.en_US
dc.descriptionSource at <a href=https://doi.org/10.3389/fmars.2018.00416>https://doi.org/10.3389/fmars.2018.00416 </a>.en_US
dc.identifier.citationPaulsen, M. L., Seuthe, L., Reigstad, M., Larsen, A., Cape, M. R. & Vernet, M. (2018). Asynchronous Accumulation of Organic Carbon and Nitrogen in the Atlantic Gateway to the Arctic Ocean. 5(416). https://doi.org/10.3389/fmars.2018.00416en_US
dc.identifier.cristinIDFRIDAID 1638230
dc.identifier.doi10.3389/fmars.2018.00416
dc.identifier.issn2296-7745
dc.identifier.urihttps://hdl.handle.net/10037/14783
dc.language.isoengen_US
dc.publisherFrontiers Mediaen_US
dc.relation.journalFrontiers in Marine Science
dc.relation.projectIDinfo:eu-repo/grantAgreement/RCN/POLARPROG/226415/Norway/Bridging marine productivity regimes: How Atlantic advection affects productivity, carbon cycling and export in a melting Arctic Ocean/CarbonBridge/en_US
dc.relation.projectIDinfo:eu-repo/grantAgreement/RCN/POLARPROG/225956/Norway/Processes and Players in Arctic Marine Pelagic Food Webs - Biogeochemistry, Environment and Climate Change/MicroPolar/en_US
dc.rights.accessRightsopenAccessen_US
dc.subjectVDP::Mathematics and natural science: 400::Zoology and botany: 480::Marine biology: 497en_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Marinbiologi: 497en_US
dc.subjectParticulate and dissolved organic matteren_US
dc.subjectNitrogen poolsen_US
dc.subjectDissolved primary productionen_US
dc.subjectHigh latitude ecosystemsen_US
dc.subjectMarginal ice zoneen_US
dc.subjectSvalbarden_US
dc.subjectWest Spitsbergen Currenten_US
dc.subjectMicroorganismsen_US
dc.titleAsynchronous Accumulation of Organic Carbon and Nitrogen in the Atlantic Gateway to the Arctic Oceanen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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