Meeting climate targets by direct CO2 injections: what price would the ocean have to pay?
We investigate the climate mitigation potential and collateral effects of direct injections of captured CO2 into the deep ocean as a possible means to close the gap between an intermediate CO2 emissions scenario and a specific temperature target, such as the 1.5 ∘C target aimed for by the Paris Agre...
Published in: | Earth System Dynamics |
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Language: | English |
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Copernicus Publications
2019
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Online Access: | https://doi.org/10.5194/esd-10-711-2019 https://noa.gwlb.de/receive/cop_mods_00040740 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00040362/esd-10-711-2019.pdf https://esd.copernicus.org/articles/10/711/2019/esd-10-711-2019.pdf |
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00040740 2023-05-15T17:52:11+02:00 Meeting climate targets by direct CO2 injections: what price would the ocean have to pay? Reith, Fabian Koeve, Wolfgang Keller, David P. Getzlaff, Julia Oschlies, Andreas 2019-11 electronic https://doi.org/10.5194/esd-10-711-2019 https://noa.gwlb.de/receive/cop_mods_00040740 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00040362/esd-10-711-2019.pdf https://esd.copernicus.org/articles/10/711/2019/esd-10-711-2019.pdf eng eng Copernicus Publications Earth System Dynamics -- http://www.earth-syst-dynam.net/ -- http://www.bibliothek.uni-regensburg.de/ezeit/?2578793 -- 2190-4987 https://doi.org/10.5194/esd-10-711-2019 https://noa.gwlb.de/receive/cop_mods_00040740 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00040362/esd-10-711-2019.pdf https://esd.copernicus.org/articles/10/711/2019/esd-10-711-2019.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2019 ftnonlinearchiv https://doi.org/10.5194/esd-10-711-2019 2022-02-08T22:41:59Z We investigate the climate mitigation potential and collateral effects of direct injections of captured CO2 into the deep ocean as a possible means to close the gap between an intermediate CO2 emissions scenario and a specific temperature target, such as the 1.5 ∘C target aimed for by the Paris Agreement. For that purpose, a suite of approaches for controlling the amount of direct CO2 injections at 3000 m water depth are implemented in an Earth system model of intermediate complexity. Following the representative concentration pathway RCP4.5, which is a medium mitigation CO2 emissions scenario, cumulative CO2 injections required to meet the 1.5 ∘C climate goal are found to be 390 Gt C by the year 2100 and 1562 Gt C at the end of simulations, by the year 3020. The latter includes a cumulative leakage of 602 Gt C that needs to be reinjected in order to sustain the targeted global mean temperature. CaCO3 sediment and weathering feedbacks reduce the required CO2 injections that comply with the 1.5 ∘C target by about 13 % in 2100 and by about 11 % at the end of the simulation. With respect to the injection-related impacts we find that average pH values in the surface ocean are increased by about 0.13 to 0.18 units, when compared to the control run. In the model, this results in significant increases in potential coral reef habitats, i.e., the volume of the global upper ocean (0 to 130 m depth) with omega aragonite > 3.4 and ocean temperatures between 21 and 28 ∘C, compared to the control run. The potential benefits in the upper ocean come at the expense of strongly acidified water masses at depth, with maximum pH reductions of about −2.37 units, relative to preindustrial levels, in the vicinity of the injection sites. Overall, this study demonstrates that massive amounts of CO2 would need to be injected into the deep ocean in order to reach and maintain the 1.5 ∘C climate target in a medium mitigation scenario on a millennium timescale, and that there is a trade-off between injection-related reductions in atmospheric CO2 levels accompanied by reduced upper-ocean acidification and adverse effects on deep-ocean chemistry, particularly near the injection sites. Article in Journal/Newspaper Ocean acidification Niedersächsisches Online-Archiv NOA Earth System Dynamics 10 4 711 727 |
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Niedersächsisches Online-Archiv NOA |
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English |
topic |
article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Reith, Fabian Koeve, Wolfgang Keller, David P. Getzlaff, Julia Oschlies, Andreas Meeting climate targets by direct CO2 injections: what price would the ocean have to pay? |
topic_facet |
article Verlagsveröffentlichung |
description |
We investigate the climate mitigation potential and collateral effects of direct injections of captured CO2 into the deep ocean as a possible means to close the gap between an intermediate CO2 emissions scenario and a specific temperature target, such as the 1.5 ∘C target aimed for by the Paris Agreement. For that purpose, a suite of approaches for controlling the amount of direct CO2 injections at 3000 m water depth are implemented in an Earth system model of intermediate complexity. Following the representative concentration pathway RCP4.5, which is a medium mitigation CO2 emissions scenario, cumulative CO2 injections required to meet the 1.5 ∘C climate goal are found to be 390 Gt C by the year 2100 and 1562 Gt C at the end of simulations, by the year 3020. The latter includes a cumulative leakage of 602 Gt C that needs to be reinjected in order to sustain the targeted global mean temperature. CaCO3 sediment and weathering feedbacks reduce the required CO2 injections that comply with the 1.5 ∘C target by about 13 % in 2100 and by about 11 % at the end of the simulation. With respect to the injection-related impacts we find that average pH values in the surface ocean are increased by about 0.13 to 0.18 units, when compared to the control run. In the model, this results in significant increases in potential coral reef habitats, i.e., the volume of the global upper ocean (0 to 130 m depth) with omega aragonite > 3.4 and ocean temperatures between 21 and 28 ∘C, compared to the control run. The potential benefits in the upper ocean come at the expense of strongly acidified water masses at depth, with maximum pH reductions of about −2.37 units, relative to preindustrial levels, in the vicinity of the injection sites. Overall, this study demonstrates that massive amounts of CO2 would need to be injected into the deep ocean in order to reach and maintain the 1.5 ∘C climate target in a medium mitigation scenario on a millennium timescale, and that there is a trade-off between injection-related reductions in atmospheric CO2 levels accompanied by reduced upper-ocean acidification and adverse effects on deep-ocean chemistry, particularly near the injection sites. |
format |
Article in Journal/Newspaper |
author |
Reith, Fabian Koeve, Wolfgang Keller, David P. Getzlaff, Julia Oschlies, Andreas |
author_facet |
Reith, Fabian Koeve, Wolfgang Keller, David P. Getzlaff, Julia Oschlies, Andreas |
author_sort |
Reith, Fabian |
title |
Meeting climate targets by direct CO2 injections: what price would the ocean have to pay? |
title_short |
Meeting climate targets by direct CO2 injections: what price would the ocean have to pay? |
title_full |
Meeting climate targets by direct CO2 injections: what price would the ocean have to pay? |
title_fullStr |
Meeting climate targets by direct CO2 injections: what price would the ocean have to pay? |
title_full_unstemmed |
Meeting climate targets by direct CO2 injections: what price would the ocean have to pay? |
title_sort |
meeting climate targets by direct co2 injections: what price would the ocean have to pay? |
publisher |
Copernicus Publications |
publishDate |
2019 |
url |
https://doi.org/10.5194/esd-10-711-2019 https://noa.gwlb.de/receive/cop_mods_00040740 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00040362/esd-10-711-2019.pdf https://esd.copernicus.org/articles/10/711/2019/esd-10-711-2019.pdf |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_relation |
Earth System Dynamics -- http://www.earth-syst-dynam.net/ -- http://www.bibliothek.uni-regensburg.de/ezeit/?2578793 -- 2190-4987 https://doi.org/10.5194/esd-10-711-2019 https://noa.gwlb.de/receive/cop_mods_00040740 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00040362/esd-10-711-2019.pdf https://esd.copernicus.org/articles/10/711/2019/esd-10-711-2019.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/esd-10-711-2019 |
container_title |
Earth System Dynamics |
container_volume |
10 |
container_issue |
4 |
container_start_page |
711 |
op_container_end_page |
727 |
_version_ |
1766159562590650368 |