The impact of dissolved organic carbon and bacterial respiration on pCO2 in experimental sea ice
peer reviewed Previous observations have shown that the partial pressure of carbon dioxide (pCO2) in sea ice brines is generally higher in Arctic sea ice compared to those from the Antarctic sea ice, especially in winter and early spring. We hypothesized that these differences result from the higher...
Published in: | Progress in Oceanography |
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Format: | Article in Journal/Newspaper |
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Pergamon Press - An Imprint of Elsevier Science
2016
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Online Access: | https://orbi.uliege.be/handle/2268/189239 https://orbi.uliege.be/bitstream/2268/189239/1/Bacterial%20respiration%20and%20pCO2%20in%20sea%20ice%20Revision3%20for%20orbi.pdf https://doi.org/10.1016/j.pocean.2015.12.005 |
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ftorbi:oai:orbi.ulg.ac.be:2268/189239 2024-04-21T07:50:28+00:00 The impact of dissolved organic carbon and bacterial respiration on pCO2 in experimental sea ice Zhou, Jiayun Kotovitch, Marie Kaartokallio, H. Moreau, S. Tison, J.-L. Kattner, G. Dieckmann, G. Thomas, D.N. Delille, Bruno FOCUS - Freshwater and OCeanic science Unit of reSearch - ULiège 2016-02 https://orbi.uliege.be/handle/2268/189239 https://orbi.uliege.be/bitstream/2268/189239/1/Bacterial%20respiration%20and%20pCO2%20in%20sea%20ice%20Revision3%20for%20orbi.pdf https://doi.org/10.1016/j.pocean.2015.12.005 en eng Pergamon Press - An Imprint of Elsevier Science urn:issn:0079-6611 https://orbi.uliege.be/handle/2268/189239 info:hdl:2268/189239 https://orbi.uliege.be/bitstream/2268/189239/1/Bacterial%20respiration%20and%20pCO2%20in%20sea%20ice%20Revision3%20for%20orbi.pdf doi:10.1016/j.pocean.2015.12.005 scopus-id:2-s2.0-84958956872 open access http://purl.org/coar/access_right/c_abf2 info:eu-repo/semantics/openAccess Progress in Oceanography, 141, 153-167 (2016-02) Physical chemical mathematical & earth Sciences Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique journal article http://purl.org/coar/resource_type/c_6501 info:eu-repo/semantics/article peer reviewed 2016 ftorbi https://doi.org/10.1016/j.pocean.2015.12.005 2024-03-27T14:53:13Z peer reviewed Previous observations have shown that the partial pressure of carbon dioxide (pCO2) in sea ice brines is generally higher in Arctic sea ice compared to those from the Antarctic sea ice, especially in winter and early spring. We hypothesized that these differences result from the higher dissolved organic carbon (DOC) content in Arctic seawater: Higher concentrations of DOC in seawater would be reflected in a greater DOC incorporation into sea ice, enhancing bacterial respiration, which in turn would increase the pCO2 in the ice. To verify this hypothesis, we performed an experiment using two series of mesocosms: one was filled with seawater (SW) and the other one with seawater with an addition of filtered humic-rich river water (SWR). The addition of river water increased the DOC concentration of the water from a median of 142 µmol L-1 in SW to 249 µmol L-1 in SWR. Sea ice was grown in these mesocosms under the same physical conditions over 19 days. Microalgae and protists were absent, and only bacterial activity has been detected. We measured the DOC concentration, bacterial respiration, total alkalinity and pCO2 in sea ice and the underlying seawater, and we calculated the changes in dissolved inorganic carbon (DIC) in both media. We found that bacterial respiration in ice was higher in SWR: median bacterial respiration was 25 nmol C L-1 h-1 compared to 10 nmol C L-1 h-1 in SW. pCO2 in ice was also higher in SWR with a median of 430 ppm compared to 356 ppm in SW. However, the differences in pCO2 were larger within the ice interiors than at the surfaces or the bottom layers of the ice, where exchanges at the air-ice and ice-water interfaces might have reduced the differences. In addition, we used a model to simulate the differences of pCO2 and DIC based on bacterial respiration. The model simulations support the experimental findings and further suggest that bacterial growth efficiency in the ice might be 0.15-0.2. It is thus credible that the higher pCO2 in Arctic sea ice brines compared with ... Article in Journal/Newspaper Antarc* Antarctic Sea ice University of Liège: ORBi (Open Repository and Bibliography) Progress in Oceanography 141 153 167 |
institution |
Open Polar |
collection |
University of Liège: ORBi (Open Repository and Bibliography) |
op_collection_id |
ftorbi |
language |
English |
topic |
Physical chemical mathematical & earth Sciences Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique |
spellingShingle |
Physical chemical mathematical & earth Sciences Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique Zhou, Jiayun Kotovitch, Marie Kaartokallio, H. Moreau, S. Tison, J.-L. Kattner, G. Dieckmann, G. Thomas, D.N. Delille, Bruno The impact of dissolved organic carbon and bacterial respiration on pCO2 in experimental sea ice |
topic_facet |
Physical chemical mathematical & earth Sciences Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique |
description |
peer reviewed Previous observations have shown that the partial pressure of carbon dioxide (pCO2) in sea ice brines is generally higher in Arctic sea ice compared to those from the Antarctic sea ice, especially in winter and early spring. We hypothesized that these differences result from the higher dissolved organic carbon (DOC) content in Arctic seawater: Higher concentrations of DOC in seawater would be reflected in a greater DOC incorporation into sea ice, enhancing bacterial respiration, which in turn would increase the pCO2 in the ice. To verify this hypothesis, we performed an experiment using two series of mesocosms: one was filled with seawater (SW) and the other one with seawater with an addition of filtered humic-rich river water (SWR). The addition of river water increased the DOC concentration of the water from a median of 142 µmol L-1 in SW to 249 µmol L-1 in SWR. Sea ice was grown in these mesocosms under the same physical conditions over 19 days. Microalgae and protists were absent, and only bacterial activity has been detected. We measured the DOC concentration, bacterial respiration, total alkalinity and pCO2 in sea ice and the underlying seawater, and we calculated the changes in dissolved inorganic carbon (DIC) in both media. We found that bacterial respiration in ice was higher in SWR: median bacterial respiration was 25 nmol C L-1 h-1 compared to 10 nmol C L-1 h-1 in SW. pCO2 in ice was also higher in SWR with a median of 430 ppm compared to 356 ppm in SW. However, the differences in pCO2 were larger within the ice interiors than at the surfaces or the bottom layers of the ice, where exchanges at the air-ice and ice-water interfaces might have reduced the differences. In addition, we used a model to simulate the differences of pCO2 and DIC based on bacterial respiration. The model simulations support the experimental findings and further suggest that bacterial growth efficiency in the ice might be 0.15-0.2. It is thus credible that the higher pCO2 in Arctic sea ice brines compared with ... |
author2 |
FOCUS - Freshwater and OCeanic science Unit of reSearch - ULiège |
format |
Article in Journal/Newspaper |
author |
Zhou, Jiayun Kotovitch, Marie Kaartokallio, H. Moreau, S. Tison, J.-L. Kattner, G. Dieckmann, G. Thomas, D.N. Delille, Bruno |
author_facet |
Zhou, Jiayun Kotovitch, Marie Kaartokallio, H. Moreau, S. Tison, J.-L. Kattner, G. Dieckmann, G. Thomas, D.N. Delille, Bruno |
author_sort |
Zhou, Jiayun |
title |
The impact of dissolved organic carbon and bacterial respiration on pCO2 in experimental sea ice |
title_short |
The impact of dissolved organic carbon and bacterial respiration on pCO2 in experimental sea ice |
title_full |
The impact of dissolved organic carbon and bacterial respiration on pCO2 in experimental sea ice |
title_fullStr |
The impact of dissolved organic carbon and bacterial respiration on pCO2 in experimental sea ice |
title_full_unstemmed |
The impact of dissolved organic carbon and bacterial respiration on pCO2 in experimental sea ice |
title_sort |
impact of dissolved organic carbon and bacterial respiration on pco2 in experimental sea ice |
publisher |
Pergamon Press - An Imprint of Elsevier Science |
publishDate |
2016 |
url |
https://orbi.uliege.be/handle/2268/189239 https://orbi.uliege.be/bitstream/2268/189239/1/Bacterial%20respiration%20and%20pCO2%20in%20sea%20ice%20Revision3%20for%20orbi.pdf https://doi.org/10.1016/j.pocean.2015.12.005 |
genre |
Antarc* Antarctic Sea ice |
genre_facet |
Antarc* Antarctic Sea ice |
op_source |
Progress in Oceanography, 141, 153-167 (2016-02) |
op_relation |
urn:issn:0079-6611 https://orbi.uliege.be/handle/2268/189239 info:hdl:2268/189239 https://orbi.uliege.be/bitstream/2268/189239/1/Bacterial%20respiration%20and%20pCO2%20in%20sea%20ice%20Revision3%20for%20orbi.pdf doi:10.1016/j.pocean.2015.12.005 scopus-id:2-s2.0-84958956872 |
op_rights |
open access http://purl.org/coar/access_right/c_abf2 info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1016/j.pocean.2015.12.005 |
container_title |
Progress in Oceanography |
container_volume |
141 |
container_start_page |
153 |
op_container_end_page |
167 |
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1796934187127668736 |