The impact of dissolved organic carbon and bacterial respiration on pCO2 in experimental sea ice
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 org...
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ftawi:oai:epic.awi.de:40989 2024-09-15T17:47:06+00:00 The impact of dissolved organic carbon and bacterial respiration on pCO2 in experimental sea ice Zhou, J. Kotovitch, M. Kaartokallio, H. Moreau, S. Tison, J.-L. Kattner, Gerhard Dieckmann, Gerhard Thomas, D. N. Delille, B. 2016 https://epic.awi.de/id/eprint/40989/ https://hdl.handle.net/10013/epic.47965 unknown PERGAMON-ELSEVIER SCIENCE LTD Zhou, J. , Kotovitch, M. , Kaartokallio, H. , Moreau, S. , Tison, J. L. , Kattner, G. , Dieckmann, G. , Thomas, D. N. and Delille, B. (2016) The impact of dissolved organic carbon and bacterial respiration on pCO2 in experimental sea ice , Progress In Oceanography, 141 , pp. 153-167 . doi:10.1016/j.pocean.2015.12.005 <https://doi.org/10.1016/j.pocean.2015.12.005> , hdl:10013/epic.47965 EPIC3Progress In Oceanography, PERGAMON-ELSEVIER SCIENCE LTD, 141, pp. 153-167, ISSN: 0079-6611 Article isiRev 2016 ftawi https://doi.org/10.1016/j.pocean.2015.12.005 2024-06-24T04:14:20Z 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 Lwater-1 in SW to 249 µmol Lwater-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 Lice-1 h-1 compared to 10 nmol C Lice-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 approach 0.15 and 0.2. It is thus credible that the higher pCO2 in Arctic sea ice brines ... Article in Journal/Newspaper Antarc* Antarctic Sea ice Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Progress in Oceanography 141 153 167 |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
language |
unknown |
description |
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 Lwater-1 in SW to 249 µmol Lwater-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 Lice-1 h-1 compared to 10 nmol C Lice-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 approach 0.15 and 0.2. It is thus credible that the higher pCO2 in Arctic sea ice brines ... |
format |
Article in Journal/Newspaper |
author |
Zhou, J. Kotovitch, M. Kaartokallio, H. Moreau, S. Tison, J.-L. Kattner, Gerhard Dieckmann, Gerhard Thomas, D. N. Delille, B. |
spellingShingle |
Zhou, J. Kotovitch, M. Kaartokallio, H. Moreau, S. Tison, J.-L. Kattner, Gerhard Dieckmann, Gerhard Thomas, D. N. Delille, B. The impact of dissolved organic carbon and bacterial respiration on pCO2 in experimental sea ice |
author_facet |
Zhou, J. Kotovitch, M. Kaartokallio, H. Moreau, S. Tison, J.-L. Kattner, Gerhard Dieckmann, Gerhard Thomas, D. N. Delille, B. |
author_sort |
Zhou, J. |
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-ELSEVIER SCIENCE LTD |
publishDate |
2016 |
url |
https://epic.awi.de/id/eprint/40989/ https://hdl.handle.net/10013/epic.47965 |
genre |
Antarc* Antarctic Sea ice |
genre_facet |
Antarc* Antarctic Sea ice |
op_source |
EPIC3Progress In Oceanography, PERGAMON-ELSEVIER SCIENCE LTD, 141, pp. 153-167, ISSN: 0079-6611 |
op_relation |
Zhou, J. , Kotovitch, M. , Kaartokallio, H. , Moreau, S. , Tison, J. L. , Kattner, G. , Dieckmann, G. , Thomas, D. N. and Delille, B. (2016) The impact of dissolved organic carbon and bacterial respiration on pCO2 in experimental sea ice , Progress In Oceanography, 141 , pp. 153-167 . doi:10.1016/j.pocean.2015.12.005 <https://doi.org/10.1016/j.pocean.2015.12.005> , hdl:10013/epic.47965 |
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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1810495720400093184 |