Contrasting Upper and Deep Ocean Oxygen Response to Protracted Global Warming
It is well established that the ocean is currently losing dissolved oxygen (O2) in response to ocean warming, but the long‐term, equilibrium response of O2 to a warmer climate is neither well quantified nor understood. Here we use idealized multimillennial global warming simulations with a comprehen...
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ftethz:oai:www.research-collection.ethz.ch:20.500.11850/438611 2023-05-15T18:07:34+02:00 Contrasting Upper and Deep Ocean Oxygen Response to Protracted Global Warming Frölicher, Thomas L. Aschwanden, M.T. Gruber, Nicolas Jaccard, Samuel L. Dunne, John P. Paynter, David 2020-08 application/application/pdf https://hdl.handle.net/20.500.11850/438611 https://doi.org/10.3929/ethz-b-000438611 en eng American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/2020GB006601 http://hdl.handle.net/20.500.11850/438611 doi:10.3929/ethz-b-000438611 info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International CC-BY Global Biogeochemical Cycles, 34 (8) dissolved oxygen Earth system model long‐term changes global warming info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2020 ftethz https://doi.org/20.500.11850/438611 https://doi.org/10.3929/ethz-b-000438611 https://doi.org/10.1029/2020GB006601 2022-04-25T14:13:02Z It is well established that the ocean is currently losing dissolved oxygen (O2) in response to ocean warming, but the long‐term, equilibrium response of O2 to a warmer climate is neither well quantified nor understood. Here we use idealized multimillennial global warming simulations with a comprehensive Earth system model to show that the equilibrium response in ocean O2 differs fundamentally from the ongoing transient response. After physical equilibration of the model (>4,000 years) under a two times preindustrial CO2 scenario, the deep ocean is better ventilated and oxygenated compared to preindustrial conditions, even though the deep ocean is substantially warmer. The recovery and overshoot of deep convection in the Weddell Sea and especially the Ross Sea after ~720 years causes a strong increase in deep ocean O2 that overcompensates the solubility‐driven decrease in O2. In contrast, O2 in most of the upper tropical ocean is substantially depleted owing to the warming‐induced O2 decrease dominating over changes in ventilation and biology. Our results emphasize the millennial‐scale impact of global warming on marine life, with some impacts emerging many centuries or even millennia after atmospheric CO2 has stabilized. ISSN:0886-6236 ISSN:1944-9224 Article in Journal/Newspaper Ross Sea Weddell Sea ETH Zürich Research Collection Ross Sea Weddell Weddell Sea |
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Open Polar |
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ETH Zürich Research Collection |
op_collection_id |
ftethz |
language |
English |
topic |
dissolved oxygen Earth system model long‐term changes global warming |
spellingShingle |
dissolved oxygen Earth system model long‐term changes global warming Frölicher, Thomas L. Aschwanden, M.T. Gruber, Nicolas Jaccard, Samuel L. Dunne, John P. Paynter, David Contrasting Upper and Deep Ocean Oxygen Response to Protracted Global Warming |
topic_facet |
dissolved oxygen Earth system model long‐term changes global warming |
description |
It is well established that the ocean is currently losing dissolved oxygen (O2) in response to ocean warming, but the long‐term, equilibrium response of O2 to a warmer climate is neither well quantified nor understood. Here we use idealized multimillennial global warming simulations with a comprehensive Earth system model to show that the equilibrium response in ocean O2 differs fundamentally from the ongoing transient response. After physical equilibration of the model (>4,000 years) under a two times preindustrial CO2 scenario, the deep ocean is better ventilated and oxygenated compared to preindustrial conditions, even though the deep ocean is substantially warmer. The recovery and overshoot of deep convection in the Weddell Sea and especially the Ross Sea after ~720 years causes a strong increase in deep ocean O2 that overcompensates the solubility‐driven decrease in O2. In contrast, O2 in most of the upper tropical ocean is substantially depleted owing to the warming‐induced O2 decrease dominating over changes in ventilation and biology. Our results emphasize the millennial‐scale impact of global warming on marine life, with some impacts emerging many centuries or even millennia after atmospheric CO2 has stabilized. ISSN:0886-6236 ISSN:1944-9224 |
format |
Article in Journal/Newspaper |
author |
Frölicher, Thomas L. Aschwanden, M.T. Gruber, Nicolas Jaccard, Samuel L. Dunne, John P. Paynter, David |
author_facet |
Frölicher, Thomas L. Aschwanden, M.T. Gruber, Nicolas Jaccard, Samuel L. Dunne, John P. Paynter, David |
author_sort |
Frölicher, Thomas L. |
title |
Contrasting Upper and Deep Ocean Oxygen Response to Protracted Global Warming |
title_short |
Contrasting Upper and Deep Ocean Oxygen Response to Protracted Global Warming |
title_full |
Contrasting Upper and Deep Ocean Oxygen Response to Protracted Global Warming |
title_fullStr |
Contrasting Upper and Deep Ocean Oxygen Response to Protracted Global Warming |
title_full_unstemmed |
Contrasting Upper and Deep Ocean Oxygen Response to Protracted Global Warming |
title_sort |
contrasting upper and deep ocean oxygen response to protracted global warming |
publisher |
American Geophysical Union |
publishDate |
2020 |
url |
https://hdl.handle.net/20.500.11850/438611 https://doi.org/10.3929/ethz-b-000438611 |
geographic |
Ross Sea Weddell Weddell Sea |
geographic_facet |
Ross Sea Weddell Weddell Sea |
genre |
Ross Sea Weddell Sea |
genre_facet |
Ross Sea Weddell Sea |
op_source |
Global Biogeochemical Cycles, 34 (8) |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2020GB006601 http://hdl.handle.net/20.500.11850/438611 doi:10.3929/ethz-b-000438611 |
op_rights |
info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/20.500.11850/438611 https://doi.org/10.3929/ethz-b-000438611 https://doi.org/10.1029/2020GB006601 |
_version_ |
1766179765412167680 |