Assessment of the sea ice carbon pump: Insights from a three-dimensional ocean-sea-ice biogeochemical model (MPIOM/HAMOCC)
It has been suggested that geochemical processes related to sea-ice growth and melt might be important for the polar carbon cycle via the so called sea-ice carbon pump (SICP). The SICP affects the air-sea CO2 exchange by influencing the composition of dissolved inorganic carbon (DIC) and total alkal...
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ftpubman:oai:pure.mpg.de:item_2249129 2023-08-20T04:02:25+02:00 Assessment of the sea ice carbon pump: Insights from a three-dimensional ocean-sea-ice biogeochemical model (MPIOM/HAMOCC) Grimm, R. Notz, D. Rysgaard, S. Glud, R. Six, K. 2016-11 application/pdf http://hdl.handle.net/11858/00-001M-0000-0029-B075-1 http://hdl.handle.net/11858/00-001M-0000-002C-EED2-8 eng eng info:eu-repo/semantics/altIdentifier/doi/10.12952/journal.elementa.000136 http://hdl.handle.net/11858/00-001M-0000-0029-B075-1 http://hdl.handle.net/11858/00-001M-0000-002C-EED2-8 info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/3.0/ Elementa: Science of the Anthropocene info:eu-repo/semantics/article 2016 ftpubman https://doi.org/10.12952/journal.elementa.000136 2023-08-01T22:22:03Z It has been suggested that geochemical processes related to sea-ice growth and melt might be important for the polar carbon cycle via the so called sea-ice carbon pump (SICP). The SICP affects the air-sea CO2 exchange by influencing the composition of dissolved inorganic carbon (DIC) and total alkalinity (TA) in the surface ocean. Here we quantify the strength of the SICP-induced air-sea CO2 flux using the global three-dimensional ocean-sea-ice-biogeochemical model MPIOM/HAMOCC. Simulations prescribing the range of observed DIC and TA concentrations in the sea ice were performed under two idealized climate scenarios for the present-day and the future oceanic and sea-ice state, both forced with a fixed atmospheric CO2 concentration. Model results indicate that the SICP-induced air-sea CO2 uptake increases with higher ratios of TA:DIC prescribed in the sea ice relative to the basic oceanic TA:DIC ratios. Independent of the modeled scenario, the simulated strength of the SICP is larger in the Antarctic than in the Arctic, because of more efficient export of brine-associated DIC from the Antarctic mixed layer. On an annual basis, we generally find an enhanced SICP-induced oceanic CO2 uptake in regions with net sea-ice melt, and enhanced SICP-induced oceanic CO2 out-gassing in regions with net sea-ice growth. These general regional patterns are modified further by the blockage of air-sea gas exchange through sea-ice coverage. Integrated over the sea-ice zones of both hemispheres, the SICP-induced oceanic CO2 uptake ranges from 2 to 14 Tg C yr−1, which is up to 7% of the simulated net CO2 uptake in polar regions, but far less than 1% of the current global oceanic CO2 uptake. Hence, while we find that the SICP plays a minor role in the modern global carbon cycle, it is of importance for the regional carbon cycle at high latitudes. Article in Journal/Newspaper Antarc* Antarctic Arctic Sea ice Max Planck Society: MPG.PuRe Antarctic Arctic The Antarctic Elementa: Science of the Anthropocene 4 |
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Open Polar |
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Max Planck Society: MPG.PuRe |
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ftpubman |
language |
English |
description |
It has been suggested that geochemical processes related to sea-ice growth and melt might be important for the polar carbon cycle via the so called sea-ice carbon pump (SICP). The SICP affects the air-sea CO2 exchange by influencing the composition of dissolved inorganic carbon (DIC) and total alkalinity (TA) in the surface ocean. Here we quantify the strength of the SICP-induced air-sea CO2 flux using the global three-dimensional ocean-sea-ice-biogeochemical model MPIOM/HAMOCC. Simulations prescribing the range of observed DIC and TA concentrations in the sea ice were performed under two idealized climate scenarios for the present-day and the future oceanic and sea-ice state, both forced with a fixed atmospheric CO2 concentration. Model results indicate that the SICP-induced air-sea CO2 uptake increases with higher ratios of TA:DIC prescribed in the sea ice relative to the basic oceanic TA:DIC ratios. Independent of the modeled scenario, the simulated strength of the SICP is larger in the Antarctic than in the Arctic, because of more efficient export of brine-associated DIC from the Antarctic mixed layer. On an annual basis, we generally find an enhanced SICP-induced oceanic CO2 uptake in regions with net sea-ice melt, and enhanced SICP-induced oceanic CO2 out-gassing in regions with net sea-ice growth. These general regional patterns are modified further by the blockage of air-sea gas exchange through sea-ice coverage. Integrated over the sea-ice zones of both hemispheres, the SICP-induced oceanic CO2 uptake ranges from 2 to 14 Tg C yr−1, which is up to 7% of the simulated net CO2 uptake in polar regions, but far less than 1% of the current global oceanic CO2 uptake. Hence, while we find that the SICP plays a minor role in the modern global carbon cycle, it is of importance for the regional carbon cycle at high latitudes. |
format |
Article in Journal/Newspaper |
author |
Grimm, R. Notz, D. Rysgaard, S. Glud, R. Six, K. |
spellingShingle |
Grimm, R. Notz, D. Rysgaard, S. Glud, R. Six, K. Assessment of the sea ice carbon pump: Insights from a three-dimensional ocean-sea-ice biogeochemical model (MPIOM/HAMOCC) |
author_facet |
Grimm, R. Notz, D. Rysgaard, S. Glud, R. Six, K. |
author_sort |
Grimm, R. |
title |
Assessment of the sea ice carbon pump: Insights from a three-dimensional ocean-sea-ice biogeochemical model (MPIOM/HAMOCC) |
title_short |
Assessment of the sea ice carbon pump: Insights from a three-dimensional ocean-sea-ice biogeochemical model (MPIOM/HAMOCC) |
title_full |
Assessment of the sea ice carbon pump: Insights from a three-dimensional ocean-sea-ice biogeochemical model (MPIOM/HAMOCC) |
title_fullStr |
Assessment of the sea ice carbon pump: Insights from a three-dimensional ocean-sea-ice biogeochemical model (MPIOM/HAMOCC) |
title_full_unstemmed |
Assessment of the sea ice carbon pump: Insights from a three-dimensional ocean-sea-ice biogeochemical model (MPIOM/HAMOCC) |
title_sort |
assessment of the sea ice carbon pump: insights from a three-dimensional ocean-sea-ice biogeochemical model (mpiom/hamocc) |
publishDate |
2016 |
url |
http://hdl.handle.net/11858/00-001M-0000-0029-B075-1 http://hdl.handle.net/11858/00-001M-0000-002C-EED2-8 |
geographic |
Antarctic Arctic The Antarctic |
geographic_facet |
Antarctic Arctic The Antarctic |
genre |
Antarc* Antarctic Arctic Sea ice |
genre_facet |
Antarc* Antarctic Arctic Sea ice |
op_source |
Elementa: Science of the Anthropocene |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.12952/journal.elementa.000136 http://hdl.handle.net/11858/00-001M-0000-0029-B075-1 http://hdl.handle.net/11858/00-001M-0000-002C-EED2-8 |
op_rights |
info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/3.0/ |
op_doi |
https://doi.org/10.12952/journal.elementa.000136 |
container_title |
Elementa: Science of the Anthropocene |
container_volume |
4 |
_version_ |
1774712855768072192 |