Assessment of the sea-ice carbon pump: Insights from a three-dimensional ocean-sea-ice-biogeochemical model (MPIOM/HAMOCC)
Abstract 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 to...
Published in: | Elementa: Science of the Anthropocene |
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2016
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Online Access: | https://doi.org/10.12952/journal.elementa.000136 https://doaj.org/article/7e3d9a05b7ac432f977891c432af9300 |
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fttriple:oai:gotriple.eu:oai:doaj.org/article:7e3d9a05b7ac432f977891c432af9300 2023-05-15T14:03:45+02:00 Assessment of the sea-ice carbon pump: Insights from a three-dimensional ocean-sea-ice-biogeochemical model (MPIOM/HAMOCC) R. Grimm D. Notz R.N. Glud S. Rysgaard K.D. Six 2016-11-01 https://doi.org/10.12952/journal.elementa.000136 https://doaj.org/article/7e3d9a05b7ac432f977891c432af9300 en eng BioOne 2325-1026 doi:10.12952/journal.elementa.000136 https://doaj.org/article/7e3d9a05b7ac432f977891c432af9300 undefined Elementa: Science of the Anthropocene (2016) Sea-ice carbon pump Polar air-sea CO2 exchange geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2016 fttriple https://doi.org/10.12952/journal.elementa.000136 2023-01-22T19:23:54Z Abstract 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 Unknown Arctic Antarctic The Antarctic Elementa: Science of the Anthropocene 4 |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
fttriple |
language |
English |
topic |
Sea-ice carbon pump Polar air-sea CO2 exchange geo envir |
spellingShingle |
Sea-ice carbon pump Polar air-sea CO2 exchange geo envir R. Grimm D. Notz R.N. Glud S. Rysgaard K.D. Six Assessment of the sea-ice carbon pump: Insights from a three-dimensional ocean-sea-ice-biogeochemical model (MPIOM/HAMOCC) |
topic_facet |
Sea-ice carbon pump Polar air-sea CO2 exchange geo envir |
description |
Abstract 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 |
R. Grimm D. Notz R.N. Glud S. Rysgaard K.D. Six |
author_facet |
R. Grimm D. Notz R.N. Glud S. Rysgaard K.D. Six |
author_sort |
R. Grimm |
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) |
publisher |
BioOne |
publishDate |
2016 |
url |
https://doi.org/10.12952/journal.elementa.000136 https://doaj.org/article/7e3d9a05b7ac432f977891c432af9300 |
geographic |
Arctic Antarctic The Antarctic |
geographic_facet |
Arctic Antarctic The Antarctic |
genre |
Antarc* Antarctic Arctic Sea ice |
genre_facet |
Antarc* Antarctic Arctic Sea ice |
op_source |
Elementa: Science of the Anthropocene (2016) |
op_relation |
2325-1026 doi:10.12952/journal.elementa.000136 https://doaj.org/article/7e3d9a05b7ac432f977891c432af9300 |
op_rights |
undefined |
op_doi |
https://doi.org/10.12952/journal.elementa.000136 |
container_title |
Elementa: Science of the Anthropocene |
container_volume |
4 |
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1766274587502313472 |