Assessing carbon dioxide removal through global and regional ocean alkalinization under high and low emission pathways
Atmospheric carbon dioxide (CO 2 ) levels continue to rise, increasing the risk of severe impacts on the Earth system, and on the ecosystem services that it provides. Artificial ocean alkalinization (AOA) is capable of reducing atmospheric CO 2 concentrations and surface warming and addressing ocean...
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ftdoajarticles:oai:doaj.org/article:ecbc18748d86491284e5d591f11fc1da 2023-05-15T17:50:00+02:00 Assessing carbon dioxide removal through global and regional ocean alkalinization under high and low emission pathways A. Lenton R. J. Matear D. P. Keller V. Scott N. E. Vaughan 2018-04-01T00:00:00Z https://doi.org/10.5194/esd-9-339-2018 https://doaj.org/article/ecbc18748d86491284e5d591f11fc1da EN eng Copernicus Publications https://www.earth-syst-dynam.net/9/339/2018/esd-9-339-2018.pdf https://doaj.org/toc/2190-4979 https://doaj.org/toc/2190-4987 doi:10.5194/esd-9-339-2018 2190-4979 2190-4987 https://doaj.org/article/ecbc18748d86491284e5d591f11fc1da Earth System Dynamics, Vol 9, Pp 339-357 (2018) Science Q Geology QE1-996.5 Dynamic and structural geology QE500-639.5 article 2018 ftdoajarticles https://doi.org/10.5194/esd-9-339-2018 2022-12-31T11:36:53Z Atmospheric carbon dioxide (CO 2 ) levels continue to rise, increasing the risk of severe impacts on the Earth system, and on the ecosystem services that it provides. Artificial ocean alkalinization (AOA) is capable of reducing atmospheric CO 2 concentrations and surface warming and addressing ocean acidification. Here, we simulate global and regional responses to alkalinity (ALK) addition (0.25 PmolALK yr −1 ) over the period 2020–2100 using the CSIRO-Mk3L-COAL Earth System Model, under high (Representative Concentration Pathway 8.5; RCP8.5) and low (RCP2.6) emissions. While regionally there are large changes in alkalinity associated with locations of AOA, globally we see only a very weak dependence on where and when AOA is applied. On a global scale, while we see that under RCP2.6 the carbon uptake associated with AOA is only ∼ 60 % of the total, under RCP8.5 the relative changes in temperature are larger, as are the changes in pH (140 %) and aragonite saturation state (170 %). The simulations reveal AOA is more effective under lower emissions, therefore the higher the emissions the more AOA is required to achieve the same reduction in global warming and ocean acidification. Finally, our simulated AOA for 2020–2100 in the RCP2.6 scenario is capable of offsetting warming and ameliorating ocean acidification increases at the global scale, but with highly variable regional responses. Article in Journal/Newspaper Ocean acidification Directory of Open Access Journals: DOAJ Articles Earth System Dynamics 9 2 339 357 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Science Q Geology QE1-996.5 Dynamic and structural geology QE500-639.5 |
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Science Q Geology QE1-996.5 Dynamic and structural geology QE500-639.5 A. Lenton R. J. Matear D. P. Keller V. Scott N. E. Vaughan Assessing carbon dioxide removal through global and regional ocean alkalinization under high and low emission pathways |
topic_facet |
Science Q Geology QE1-996.5 Dynamic and structural geology QE500-639.5 |
description |
Atmospheric carbon dioxide (CO 2 ) levels continue to rise, increasing the risk of severe impacts on the Earth system, and on the ecosystem services that it provides. Artificial ocean alkalinization (AOA) is capable of reducing atmospheric CO 2 concentrations and surface warming and addressing ocean acidification. Here, we simulate global and regional responses to alkalinity (ALK) addition (0.25 PmolALK yr −1 ) over the period 2020–2100 using the CSIRO-Mk3L-COAL Earth System Model, under high (Representative Concentration Pathway 8.5; RCP8.5) and low (RCP2.6) emissions. While regionally there are large changes in alkalinity associated with locations of AOA, globally we see only a very weak dependence on where and when AOA is applied. On a global scale, while we see that under RCP2.6 the carbon uptake associated with AOA is only ∼ 60 % of the total, under RCP8.5 the relative changes in temperature are larger, as are the changes in pH (140 %) and aragonite saturation state (170 %). The simulations reveal AOA is more effective under lower emissions, therefore the higher the emissions the more AOA is required to achieve the same reduction in global warming and ocean acidification. Finally, our simulated AOA for 2020–2100 in the RCP2.6 scenario is capable of offsetting warming and ameliorating ocean acidification increases at the global scale, but with highly variable regional responses. |
format |
Article in Journal/Newspaper |
author |
A. Lenton R. J. Matear D. P. Keller V. Scott N. E. Vaughan |
author_facet |
A. Lenton R. J. Matear D. P. Keller V. Scott N. E. Vaughan |
author_sort |
A. Lenton |
title |
Assessing carbon dioxide removal through global and regional ocean alkalinization under high and low emission pathways |
title_short |
Assessing carbon dioxide removal through global and regional ocean alkalinization under high and low emission pathways |
title_full |
Assessing carbon dioxide removal through global and regional ocean alkalinization under high and low emission pathways |
title_fullStr |
Assessing carbon dioxide removal through global and regional ocean alkalinization under high and low emission pathways |
title_full_unstemmed |
Assessing carbon dioxide removal through global and regional ocean alkalinization under high and low emission pathways |
title_sort |
assessing carbon dioxide removal through global and regional ocean alkalinization under high and low emission pathways |
publisher |
Copernicus Publications |
publishDate |
2018 |
url |
https://doi.org/10.5194/esd-9-339-2018 https://doaj.org/article/ecbc18748d86491284e5d591f11fc1da |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
Earth System Dynamics, Vol 9, Pp 339-357 (2018) |
op_relation |
https://www.earth-syst-dynam.net/9/339/2018/esd-9-339-2018.pdf https://doaj.org/toc/2190-4979 https://doaj.org/toc/2190-4987 doi:10.5194/esd-9-339-2018 2190-4979 2190-4987 https://doaj.org/article/ecbc18748d86491284e5d591f11fc1da |
op_doi |
https://doi.org/10.5194/esd-9-339-2018 |
container_title |
Earth System Dynamics |
container_volume |
9 |
container_issue |
2 |
container_start_page |
339 |
op_container_end_page |
357 |
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1766156573572333568 |