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Remineralization rate of terrestrial DOC as inferred from CO2 supersaturated coastal waters
Stockholms universitet, Naturvetenskapliga fakulteten, Meteorologiska institutionen (MISU).
Stockholms universitet, Naturvetenskapliga fakulteten, Stockholms universitets Östersjöcentrum. University of Helsinki, Finland.ORCID-id: 0000-0002-0649-5599
Stockholms universitet, Naturvetenskapliga fakulteten, Stockholms universitets Östersjöcentrum, Baltic Nest Institute.ORCID-id: 0000-0002-4215-9322
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2019 (Engelska)Ingår i: Biogeosciences Discussions, ISSN 1810-6277, E-ISSN 1810-6285, Vol. 16, nr 3, s. 863-879Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Coastal seas receive large amounts of terrestrially derived organic carbon (OC). The fate of this carbon, and its impact on the marine environment, is however poorly understood. Here we combine underway CO2 partial pressure (pCO2) measurements with coupled 3D hydrodynamical-biogeochemical modelling to investigate whether remineralization of terrestrial dissolved organic carbon (tDOC) can explain CO2 supersaturated surface waters in the Gulf of Bothnia, a subarctic estuary. We find that a substantial remineralization of tDOC, and that a strong tDOC induced light attenuation dampening the primary production, is required to reproduce the observed CO2 supersaturated waters in the nearshore areas. A removal rate of tDOC of the order of one year, estimated in a previous modelling study in the same area, gives a good agreement between modelled and observed pCO2. The remineralization rate is on the same order as bacterial degradation rates calculated from published incubation experiments, suggesting that this remineralization could be caused by bacterial degradation. Furthermore, the observed high pCO2 values during the ice covered season argues against photochemical degradation as the main removal mechanism. All of the remineralized tDOC is outgassed to the atmosphere in the model, turning the northernmost part of the Gulf of Bothnia to a source of atmospheric CO2.

Ort, förlag, år, upplaga, sidor
2019. Vol. 16, nr 3, s. 863-879
Nationell ämneskategori
Geovetenskap och miljövetenskap
Identifikatorer
URN: urn:nbn:se:su:diva-164515DOI: 10.5194/bg-2018-333ISI: 000459214200002OAI: oai:DiVA.org:su-164515DiVA, id: diva2:1279556
Tillgänglig från: 2018-08-08 Skapad: 2019-01-16 Senast uppdaterad: 2019-12-17Bibliografiskt granskad

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Av författaren/redaktören
Fransner, FilippaHumborg, ChristophGustafsson, ErikNycander, Jonas
Av organisationen
Meteorologiska institutionen (MISU)Stockholms universitets ÖstersjöcentrumBaltic Nest Institute
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Biogeosciences Discussions
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