Remineralization rate of terrestrial DOC as inferred from CO2 supersaturated coastal waters
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 3-D hydrodynamical–biogeochemical modelling...
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Online Access: | http://hdl.handle.net/11250/2636354 https://doi.org/10.5194/bg-16-863-2019 |
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ftimr:oai:imr.brage.unit.no:11250/2636354 2023-05-15T18:28:26+02:00 Remineralization rate of terrestrial DOC as inferred from CO2 supersaturated coastal waters Fransner, Filippa Fransson, Agneta Ingrid Humborg, Christoph Gustafsson, Erik Tedesco, Letizia Hordoir, Robinson Nycander, Jonas 2019 application/pdf http://hdl.handle.net/11250/2636354 https://doi.org/10.5194/bg-16-863-2019 eng eng Biogeosciences. 2019, 16 (4), 863-879. urn:issn:1726-4170 http://hdl.handle.net/11250/2636354 https://doi.org/10.5194/bg-16-863-2019 cristin:1703408 863-879 16 Biogeosciences 4 Journal article Peer reviewed 2019 ftimr https://doi.org/10.5194/bg-16-863-2019 2021-09-23T20:15:23Z 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 3-D 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 a strong tDOC-induced light attenuation dampening the primary production are required to reproduce the observed CO2 supersaturated waters in the nearshore areas. A removal rate of tDOC of the order of 1 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 bacteria has the potential to cause this degradation. Furthermore, the observed high pCO2 values during the ice-covered season argue 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 into a source of CO2 to the atmosphere. publishedVersion Article in Journal/Newspaper Subarctic Institute for Marine Research: Brage IMR Biogeosciences 16 4 863 879 |
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Open Polar |
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Institute for Marine Research: Brage IMR |
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ftimr |
language |
English |
description |
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 3-D 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 a strong tDOC-induced light attenuation dampening the primary production are required to reproduce the observed CO2 supersaturated waters in the nearshore areas. A removal rate of tDOC of the order of 1 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 bacteria has the potential to cause this degradation. Furthermore, the observed high pCO2 values during the ice-covered season argue 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 into a source of CO2 to the atmosphere. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Fransner, Filippa Fransson, Agneta Ingrid Humborg, Christoph Gustafsson, Erik Tedesco, Letizia Hordoir, Robinson Nycander, Jonas |
spellingShingle |
Fransner, Filippa Fransson, Agneta Ingrid Humborg, Christoph Gustafsson, Erik Tedesco, Letizia Hordoir, Robinson Nycander, Jonas Remineralization rate of terrestrial DOC as inferred from CO2 supersaturated coastal waters |
author_facet |
Fransner, Filippa Fransson, Agneta Ingrid Humborg, Christoph Gustafsson, Erik Tedesco, Letizia Hordoir, Robinson Nycander, Jonas |
author_sort |
Fransner, Filippa |
title |
Remineralization rate of terrestrial DOC as inferred from CO2 supersaturated coastal waters |
title_short |
Remineralization rate of terrestrial DOC as inferred from CO2 supersaturated coastal waters |
title_full |
Remineralization rate of terrestrial DOC as inferred from CO2 supersaturated coastal waters |
title_fullStr |
Remineralization rate of terrestrial DOC as inferred from CO2 supersaturated coastal waters |
title_full_unstemmed |
Remineralization rate of terrestrial DOC as inferred from CO2 supersaturated coastal waters |
title_sort |
remineralization rate of terrestrial doc as inferred from co2 supersaturated coastal waters |
publishDate |
2019 |
url |
http://hdl.handle.net/11250/2636354 https://doi.org/10.5194/bg-16-863-2019 |
genre |
Subarctic |
genre_facet |
Subarctic |
op_source |
863-879 16 Biogeosciences 4 |
op_relation |
Biogeosciences. 2019, 16 (4), 863-879. urn:issn:1726-4170 http://hdl.handle.net/11250/2636354 https://doi.org/10.5194/bg-16-863-2019 cristin:1703408 |
op_doi |
https://doi.org/10.5194/bg-16-863-2019 |
container_title |
Biogeosciences |
container_volume |
16 |
container_issue |
4 |
container_start_page |
863 |
op_container_end_page |
879 |
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1766210921032581120 |