Impact of sea-ice processes on the carbonate system and ocean acidification at the ice-water interface of the Amundsen Gulf, Arctic Ocean
From sea-ice formation in November 2007 to onset of ice melt in May 2008, we studied the carbonate system in first-year Arctic sea ice, focusing on the impact of calcium-carbonate (CaCO3) saturation states of aragonite (ΩAr) and calcite (ΩCa) at the ice-water interface (UIW). Based on total inorgani...
Published in: | Journal of Geophysical Research: Oceans |
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Online Access: | http://hdl.handle.net/11250/109329 https://doi.org/10.1002/2013JC009164 |
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ftimr:oai:imr.brage.unit.no:11250/109329 2023-05-15T13:22:57+02:00 Impact of sea-ice processes on the carbonate system and ocean acidification at the ice-water interface of the Amundsen Gulf, Arctic Ocean Fransson, Agneta Chierici, Melissa Miller, Lisa Ann Carnat, Gauthier Shadwick, Elizabeth Thomas, Helmuth Pineault, Simon Papakyriakou, Tim N 2014-02-07T08:22:16Z application/pdf http://hdl.handle.net/11250/109329 https://doi.org/10.1002/2013JC009164 eng eng Fransson, A., M. Chierici, L. A. Miller, G. Carnat, E. Shadwick, H. Thomas, S. Pineault, and T. N. Papakyriakou (2013), Impact of sea-ice processes on the carbonate system and ocean acidification at the ice-water interface of the Amundsen Gulf, Arctic Ocean, J. Geophys. Res. Oceans, 118, 7001–7023, doi:10.1002/2013JC009164. urn:issn:0148-0227 http://hdl.handle.net/11250/109329 https://doi.org/10.1002/2013JC009164 cristin:1110563 Journal article Peer reviewed 2014 ftimr https://doi.org/10.1002/2013JC009164 2021-09-23T20:16:03Z From sea-ice formation in November 2007 to onset of ice melt in May 2008, we studied the carbonate system in first-year Arctic sea ice, focusing on the impact of calcium-carbonate (CaCO3) saturation states of aragonite (ΩAr) and calcite (ΩCa) at the ice-water interface (UIW). Based on total inorganic carbon (CT) and total alkalinity (AT), and derived pH, CO2, carbonate ion ([CO32−]) concentrations and Ω, we investigated the major drivers such as brine rejection, CaCO3 precipitation, bacterial respiration, primary production and CO2-gas flux in sea ice, brine, frost flowers and UIW. We estimated large variability in sea-ice CT at the top, mid, and bottom ice. Changes due to CaCO3 and CO2-gas flux had large impact on CT in the whole ice core from March to May, bacterial respiration was important at the bottom ice during all months, and primary production in May. It was evident that the sea-ice processes had large impact on UIW, resulting in a five times larger seasonal amplitude of the carbonate system, relative to the upper 20 m. During ice formation, [CO2] increased by 30 µmol kg−1, [CO32−] decreased by 50 µmol kg−1, and the ΩAr decreased by 0.8 in the UIW due to CO2-enriched brine from solid CaCO3. Conversely, during ice melt, [CO32−] increased by 90 µmol kg−1 in the UIW, and Ω increased by 1.4 between March and May, likely due to CaCO3 dissolution and primary production. We estimated that increased ice melt would lead to enhanced oceanic uptake of inorganic carbon to the surface layer. Article in Journal/Newspaper Amundsen Gulf Arctic Arctic Arctic Ocean ice core Ocean acidification Sea ice Institute for Marine Research: Brage IMR Arctic Arctic Ocean Journal of Geophysical Research: Oceans 118 12 7001 7023 |
institution |
Open Polar |
collection |
Institute for Marine Research: Brage IMR |
op_collection_id |
ftimr |
language |
English |
description |
From sea-ice formation in November 2007 to onset of ice melt in May 2008, we studied the carbonate system in first-year Arctic sea ice, focusing on the impact of calcium-carbonate (CaCO3) saturation states of aragonite (ΩAr) and calcite (ΩCa) at the ice-water interface (UIW). Based on total inorganic carbon (CT) and total alkalinity (AT), and derived pH, CO2, carbonate ion ([CO32−]) concentrations and Ω, we investigated the major drivers such as brine rejection, CaCO3 precipitation, bacterial respiration, primary production and CO2-gas flux in sea ice, brine, frost flowers and UIW. We estimated large variability in sea-ice CT at the top, mid, and bottom ice. Changes due to CaCO3 and CO2-gas flux had large impact on CT in the whole ice core from March to May, bacterial respiration was important at the bottom ice during all months, and primary production in May. It was evident that the sea-ice processes had large impact on UIW, resulting in a five times larger seasonal amplitude of the carbonate system, relative to the upper 20 m. During ice formation, [CO2] increased by 30 µmol kg−1, [CO32−] decreased by 50 µmol kg−1, and the ΩAr decreased by 0.8 in the UIW due to CO2-enriched brine from solid CaCO3. Conversely, during ice melt, [CO32−] increased by 90 µmol kg−1 in the UIW, and Ω increased by 1.4 between March and May, likely due to CaCO3 dissolution and primary production. We estimated that increased ice melt would lead to enhanced oceanic uptake of inorganic carbon to the surface layer. |
format |
Article in Journal/Newspaper |
author |
Fransson, Agneta Chierici, Melissa Miller, Lisa Ann Carnat, Gauthier Shadwick, Elizabeth Thomas, Helmuth Pineault, Simon Papakyriakou, Tim N |
spellingShingle |
Fransson, Agneta Chierici, Melissa Miller, Lisa Ann Carnat, Gauthier Shadwick, Elizabeth Thomas, Helmuth Pineault, Simon Papakyriakou, Tim N Impact of sea-ice processes on the carbonate system and ocean acidification at the ice-water interface of the Amundsen Gulf, Arctic Ocean |
author_facet |
Fransson, Agneta Chierici, Melissa Miller, Lisa Ann Carnat, Gauthier Shadwick, Elizabeth Thomas, Helmuth Pineault, Simon Papakyriakou, Tim N |
author_sort |
Fransson, Agneta |
title |
Impact of sea-ice processes on the carbonate system and ocean acidification at the ice-water interface of the Amundsen Gulf, Arctic Ocean |
title_short |
Impact of sea-ice processes on the carbonate system and ocean acidification at the ice-water interface of the Amundsen Gulf, Arctic Ocean |
title_full |
Impact of sea-ice processes on the carbonate system and ocean acidification at the ice-water interface of the Amundsen Gulf, Arctic Ocean |
title_fullStr |
Impact of sea-ice processes on the carbonate system and ocean acidification at the ice-water interface of the Amundsen Gulf, Arctic Ocean |
title_full_unstemmed |
Impact of sea-ice processes on the carbonate system and ocean acidification at the ice-water interface of the Amundsen Gulf, Arctic Ocean |
title_sort |
impact of sea-ice processes on the carbonate system and ocean acidification at the ice-water interface of the amundsen gulf, arctic ocean |
publishDate |
2014 |
url |
http://hdl.handle.net/11250/109329 https://doi.org/10.1002/2013JC009164 |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Amundsen Gulf Arctic Arctic Arctic Ocean ice core Ocean acidification Sea ice |
genre_facet |
Amundsen Gulf Arctic Arctic Arctic Ocean ice core Ocean acidification Sea ice |
op_relation |
Fransson, A., M. Chierici, L. A. Miller, G. Carnat, E. Shadwick, H. Thomas, S. Pineault, and T. N. Papakyriakou (2013), Impact of sea-ice processes on the carbonate system and ocean acidification at the ice-water interface of the Amundsen Gulf, Arctic Ocean, J. Geophys. Res. Oceans, 118, 7001–7023, doi:10.1002/2013JC009164. urn:issn:0148-0227 http://hdl.handle.net/11250/109329 https://doi.org/10.1002/2013JC009164 cristin:1110563 |
op_doi |
https://doi.org/10.1002/2013JC009164 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
118 |
container_issue |
12 |
container_start_page |
7001 |
op_container_end_page |
7023 |
_version_ |
1766368041819439104 |