Ocean carbon cycle feedbacks in CMIP6 models: contributions from different basins
The ocean response to carbon emissions involves the combined effect of an increase in atmospheric CO 2 , acting to enhance the ocean carbon storage, and climate change, acting to decrease the ocean carbon storage. This ocean response can be characterised in terms of a carbon–concentration feedback a...
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ftdoajarticles:oai:doaj.org/article:419ad4d692524adc96d1ad2322186d00 2023-05-15T15:02:07+02:00 Ocean carbon cycle feedbacks in CMIP6 models: contributions from different basins A. Katavouta R. G. Williams 2021-05-01T00:00:00Z https://doi.org/10.5194/bg-18-3189-2021 https://doaj.org/article/419ad4d692524adc96d1ad2322186d00 EN eng Copernicus Publications https://bg.copernicus.org/articles/18/3189/2021/bg-18-3189-2021.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-18-3189-2021 1726-4170 1726-4189 https://doaj.org/article/419ad4d692524adc96d1ad2322186d00 Biogeosciences, Vol 18, Pp 3189-3218 (2021) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2021 ftdoajarticles https://doi.org/10.5194/bg-18-3189-2021 2022-12-31T16:36:57Z The ocean response to carbon emissions involves the combined effect of an increase in atmospheric CO 2 , acting to enhance the ocean carbon storage, and climate change, acting to decrease the ocean carbon storage. This ocean response can be characterised in terms of a carbon–concentration feedback and a carbon–climate feedback. The contribution from different ocean basins to these feedbacks on centennial timescales is explored using diagnostics of ocean carbonate chemistry, physical ventilation and biological processes in 11 CMIP6 Earth system models. To gain mechanistic insight, the dependence of these feedbacks on the Atlantic Meridional Overturning Circulation (AMOC) is also investigated in an idealised climate model and the CMIP6 models. For the carbon–concentration feedback, the Atlantic, Pacific and Southern oceans provide comparable contributions when estimated in terms of the volume-integrated carbon storage. This large contribution from the Atlantic Ocean relative to its size is due to strong local physical ventilation and an influx of carbon transported from the Southern Ocean. The Southern Ocean has large anthropogenic carbon uptake from the atmosphere, but its contribution to the carbon storage is relatively small due to large carbon transport to the other basins. For the carbon–climate feedback estimated in terms of carbon storage, the Atlantic and Arctic oceans provide the largest contributions relative to their size. In the Atlantic, this large contribution is primarily due to climate change acting to reduce the physical ventilation. In the Arctic, this large contribution is associated with a large warming per unit volume. The Southern Ocean provides a relatively small contribution to the carbon–climate feedback, due to competition between the climate effects of a decrease in solubility and physical ventilation and an increase in accumulation of regenerated carbon. The more poorly ventilated Indo-Pacific Ocean provides a small contribution to the carbon cycle feedbacks relative to its size. In the ... Article in Journal/Newspaper Arctic Climate change Southern Ocean Directory of Open Access Journals: DOAJ Articles Arctic Southern Ocean Pacific Biogeosciences 18 10 3189 3218 |
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Directory of Open Access Journals: DOAJ Articles |
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ftdoajarticles |
language |
English |
topic |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
spellingShingle |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 A. Katavouta R. G. Williams Ocean carbon cycle feedbacks in CMIP6 models: contributions from different basins |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
The ocean response to carbon emissions involves the combined effect of an increase in atmospheric CO 2 , acting to enhance the ocean carbon storage, and climate change, acting to decrease the ocean carbon storage. This ocean response can be characterised in terms of a carbon–concentration feedback and a carbon–climate feedback. The contribution from different ocean basins to these feedbacks on centennial timescales is explored using diagnostics of ocean carbonate chemistry, physical ventilation and biological processes in 11 CMIP6 Earth system models. To gain mechanistic insight, the dependence of these feedbacks on the Atlantic Meridional Overturning Circulation (AMOC) is also investigated in an idealised climate model and the CMIP6 models. For the carbon–concentration feedback, the Atlantic, Pacific and Southern oceans provide comparable contributions when estimated in terms of the volume-integrated carbon storage. This large contribution from the Atlantic Ocean relative to its size is due to strong local physical ventilation and an influx of carbon transported from the Southern Ocean. The Southern Ocean has large anthropogenic carbon uptake from the atmosphere, but its contribution to the carbon storage is relatively small due to large carbon transport to the other basins. For the carbon–climate feedback estimated in terms of carbon storage, the Atlantic and Arctic oceans provide the largest contributions relative to their size. In the Atlantic, this large contribution is primarily due to climate change acting to reduce the physical ventilation. In the Arctic, this large contribution is associated with a large warming per unit volume. The Southern Ocean provides a relatively small contribution to the carbon–climate feedback, due to competition between the climate effects of a decrease in solubility and physical ventilation and an increase in accumulation of regenerated carbon. The more poorly ventilated Indo-Pacific Ocean provides a small contribution to the carbon cycle feedbacks relative to its size. In the ... |
format |
Article in Journal/Newspaper |
author |
A. Katavouta R. G. Williams |
author_facet |
A. Katavouta R. G. Williams |
author_sort |
A. Katavouta |
title |
Ocean carbon cycle feedbacks in CMIP6 models: contributions from different basins |
title_short |
Ocean carbon cycle feedbacks in CMIP6 models: contributions from different basins |
title_full |
Ocean carbon cycle feedbacks in CMIP6 models: contributions from different basins |
title_fullStr |
Ocean carbon cycle feedbacks in CMIP6 models: contributions from different basins |
title_full_unstemmed |
Ocean carbon cycle feedbacks in CMIP6 models: contributions from different basins |
title_sort |
ocean carbon cycle feedbacks in cmip6 models: contributions from different basins |
publisher |
Copernicus Publications |
publishDate |
2021 |
url |
https://doi.org/10.5194/bg-18-3189-2021 https://doaj.org/article/419ad4d692524adc96d1ad2322186d00 |
geographic |
Arctic Southern Ocean Pacific |
geographic_facet |
Arctic Southern Ocean Pacific |
genre |
Arctic Climate change Southern Ocean |
genre_facet |
Arctic Climate change Southern Ocean |
op_source |
Biogeosciences, Vol 18, Pp 3189-3218 (2021) |
op_relation |
https://bg.copernicus.org/articles/18/3189/2021/bg-18-3189-2021.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-18-3189-2021 1726-4170 1726-4189 https://doaj.org/article/419ad4d692524adc96d1ad2322186d00 |
op_doi |
https://doi.org/10.5194/bg-18-3189-2021 |
container_title |
Biogeosciences |
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18 |
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10 |
container_start_page |
3189 |
op_container_end_page |
3218 |
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1766334100715601920 |