Ice sheet decline and rising atmospheric CO2 control AMOC sensitivity to deglacial meltwater discharge
The last deglaciation was characterized by a sequence of abrupt climate events thought to be linked to rapid changes in Atlantic meridional overturning circulation (AMOC). The sequence includes a weakening of the AMOC after the Last Glacial Maximum (LGM) during Heinrich Stadial 1 (HS1), which ends w...
Published in: | Global and Planetary Change |
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Online Access: | https://epic.awi.de/id/eprint/57985/ https://epic.awi.de/id/eprint/57985/1/Sun_et_al_2022.pdf https://doi.org/10.1016/j.gloplacha.2022.103755 https://hdl.handle.net/10013/epic.8d65d24e-f417-40f9-8b0f-b7a2dce64805 |
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ftawi:oai:epic.awi.de:57985 2023-10-09T21:52:23+02:00 Ice sheet decline and rising atmospheric CO2 control AMOC sensitivity to deglacial meltwater discharge Sun, Yuchen Knorr, Gregor Zhang, Xu Tarasov, Lev Barker, Stephen Werner, Martin Lohmann, Gerrit 2022-03 application/pdf https://epic.awi.de/id/eprint/57985/ https://epic.awi.de/id/eprint/57985/1/Sun_et_al_2022.pdf https://doi.org/10.1016/j.gloplacha.2022.103755 https://hdl.handle.net/10013/epic.8d65d24e-f417-40f9-8b0f-b7a2dce64805 unknown Elsevier https://epic.awi.de/id/eprint/57985/1/Sun_et_al_2022.pdf Sun, Y. orcid:0000-0002-2449-8718 , Knorr, G. orcid:0000-0002-8317-5046 , Zhang, X. , Tarasov, L. , Barker, S. , Werner, M. orcid:0000-0002-6473-0243 and Lohmann, G. orcid:0000-0003-2089-733X (2022) Ice sheet decline and rising atmospheric CO2 control AMOC sensitivity to deglacial meltwater discharge , Global and Planetary Change, 210 , p. 103755 . doi:10.1016/j.gloplacha.2022.103755 <https://doi.org/10.1016/j.gloplacha.2022.103755> , hdl:10013/epic.8d65d24e-f417-40f9-8b0f-b7a2dce64805 EPIC3Global and Planetary Change, Elsevier, 210, pp. 103755-103755, ISSN: 0921-8181 Article isiRev 2022 ftawi https://doi.org/10.1016/j.gloplacha.2022.103755 2023-09-24T23:22:06Z The last deglaciation was characterized by a sequence of abrupt climate events thought to be linked to rapid changes in Atlantic meridional overturning circulation (AMOC). The sequence includes a weakening of the AMOC after the Last Glacial Maximum (LGM) during Heinrich Stadial 1 (HS1), which ends with an abrupt AMOC amplification at the transition to the Bølling/Allerød (B/A). This transition occurs despite persistent deglacial meltwater fluxes that counteract vigorous North Atlantic deep-water formation. Using the Earth system model COSMOS with a range of deglacial boundary conditions and reconstructed deglacial meltwater fluxes, we show that deglacial CO2 rise and ice sheet decline modulate the sensitivity of the AMOC to these fluxes. While declining ice sheets increase the sensitivity, increasing atmospheric CO2 levels tend to counteract this effect. Therefore, the occurrence of a weaker HS1 AMOC and an abrupt AMOC increase in the presence of meltwater, might be explained by these effects, as an alternative to or in combination with changes in the magnitude or routing of meltwater discharge. Article in Journal/Newspaper Ice Sheet North Atlantic Deep Water North Atlantic Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Global and Planetary Change 210 103755 |
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Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
language |
unknown |
description |
The last deglaciation was characterized by a sequence of abrupt climate events thought to be linked to rapid changes in Atlantic meridional overturning circulation (AMOC). The sequence includes a weakening of the AMOC after the Last Glacial Maximum (LGM) during Heinrich Stadial 1 (HS1), which ends with an abrupt AMOC amplification at the transition to the Bølling/Allerød (B/A). This transition occurs despite persistent deglacial meltwater fluxes that counteract vigorous North Atlantic deep-water formation. Using the Earth system model COSMOS with a range of deglacial boundary conditions and reconstructed deglacial meltwater fluxes, we show that deglacial CO2 rise and ice sheet decline modulate the sensitivity of the AMOC to these fluxes. While declining ice sheets increase the sensitivity, increasing atmospheric CO2 levels tend to counteract this effect. Therefore, the occurrence of a weaker HS1 AMOC and an abrupt AMOC increase in the presence of meltwater, might be explained by these effects, as an alternative to or in combination with changes in the magnitude or routing of meltwater discharge. |
format |
Article in Journal/Newspaper |
author |
Sun, Yuchen Knorr, Gregor Zhang, Xu Tarasov, Lev Barker, Stephen Werner, Martin Lohmann, Gerrit |
spellingShingle |
Sun, Yuchen Knorr, Gregor Zhang, Xu Tarasov, Lev Barker, Stephen Werner, Martin Lohmann, Gerrit Ice sheet decline and rising atmospheric CO2 control AMOC sensitivity to deglacial meltwater discharge |
author_facet |
Sun, Yuchen Knorr, Gregor Zhang, Xu Tarasov, Lev Barker, Stephen Werner, Martin Lohmann, Gerrit |
author_sort |
Sun, Yuchen |
title |
Ice sheet decline and rising atmospheric CO2 control AMOC sensitivity to deglacial meltwater discharge |
title_short |
Ice sheet decline and rising atmospheric CO2 control AMOC sensitivity to deglacial meltwater discharge |
title_full |
Ice sheet decline and rising atmospheric CO2 control AMOC sensitivity to deglacial meltwater discharge |
title_fullStr |
Ice sheet decline and rising atmospheric CO2 control AMOC sensitivity to deglacial meltwater discharge |
title_full_unstemmed |
Ice sheet decline and rising atmospheric CO2 control AMOC sensitivity to deglacial meltwater discharge |
title_sort |
ice sheet decline and rising atmospheric co2 control amoc sensitivity to deglacial meltwater discharge |
publisher |
Elsevier |
publishDate |
2022 |
url |
https://epic.awi.de/id/eprint/57985/ https://epic.awi.de/id/eprint/57985/1/Sun_et_al_2022.pdf https://doi.org/10.1016/j.gloplacha.2022.103755 https://hdl.handle.net/10013/epic.8d65d24e-f417-40f9-8b0f-b7a2dce64805 |
genre |
Ice Sheet North Atlantic Deep Water North Atlantic |
genre_facet |
Ice Sheet North Atlantic Deep Water North Atlantic |
op_source |
EPIC3Global and Planetary Change, Elsevier, 210, pp. 103755-103755, ISSN: 0921-8181 |
op_relation |
https://epic.awi.de/id/eprint/57985/1/Sun_et_al_2022.pdf Sun, Y. orcid:0000-0002-2449-8718 , Knorr, G. orcid:0000-0002-8317-5046 , Zhang, X. , Tarasov, L. , Barker, S. , Werner, M. orcid:0000-0002-6473-0243 and Lohmann, G. orcid:0000-0003-2089-733X (2022) Ice sheet decline and rising atmospheric CO2 control AMOC sensitivity to deglacial meltwater discharge , Global and Planetary Change, 210 , p. 103755 . doi:10.1016/j.gloplacha.2022.103755 <https://doi.org/10.1016/j.gloplacha.2022.103755> , hdl:10013/epic.8d65d24e-f417-40f9-8b0f-b7a2dce64805 |
op_doi |
https://doi.org/10.1016/j.gloplacha.2022.103755 |
container_title |
Global and Planetary Change |
container_volume |
210 |
container_start_page |
103755 |
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1779315549502701568 |