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...
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ftunivcardiff:oai:https://orca.cardiff.ac.uk:147752 2023-05-15T16:40:27+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 2022-03-31 application/pdf https://orca.cardiff.ac.uk/id/eprint/147752/ https://doi.org/10.1016/j.gloplacha.2022.103755 https://orca.cardiff.ac.uk/id/eprint/147752/1/SunY2022DeglacialAMOCSensitivityGPC.pdf en eng Elsevier https://orca.cardiff.ac.uk/id/eprint/147752/1/SunY2022DeglacialAMOCSensitivityGPC.pdf Sun, Yuchen, Knorr, Gregor, Zhang, Xu, Tarasov, Lev, Barker, Stephen https://orca.cardiff.ac.uk/view/cardiffauthors/A015364W.html orcid:0000-0001-7870-6431 orcid:0000-0001-7870-6431, Werner, Martin and Lohmann, Gerrit 2022. Ice sheet decline and rising atmospheric CO2 control AMOC sensitivity to deglacial meltwater discharge. Global and Planetary Change 210 , 103755. 10.1016/j.gloplacha.2022.103755 https://doi.org/10.1016/j.gloplacha.2022.103755 file https://orca.cardiff.ac.uk/147752/1/SunY2022DeglacialAMOCSensitivityGPC.pdf doi:10.1016/j.gloplacha.2022.103755 cc_by CC-BY Article PeerReviewed 2022 ftunivcardiff https://doi.org/10.1016/j.gloplacha.2022.103755 2022-11-10T23:42:46Z 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 Cardiff University: ORCA (Online Research @ Cardiff) Global and Planetary Change 210 103755 |
institution |
Open Polar |
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Cardiff University: ORCA (Online Research @ Cardiff) |
op_collection_id |
ftunivcardiff |
language |
English |
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://orca.cardiff.ac.uk/id/eprint/147752/ https://doi.org/10.1016/j.gloplacha.2022.103755 https://orca.cardiff.ac.uk/id/eprint/147752/1/SunY2022DeglacialAMOCSensitivityGPC.pdf |
genre |
Ice Sheet North Atlantic Deep Water North Atlantic |
genre_facet |
Ice Sheet North Atlantic Deep Water North Atlantic |
op_relation |
https://orca.cardiff.ac.uk/id/eprint/147752/1/SunY2022DeglacialAMOCSensitivityGPC.pdf Sun, Yuchen, Knorr, Gregor, Zhang, Xu, Tarasov, Lev, Barker, Stephen https://orca.cardiff.ac.uk/view/cardiffauthors/A015364W.html orcid:0000-0001-7870-6431 orcid:0000-0001-7870-6431, Werner, Martin and Lohmann, Gerrit 2022. Ice sheet decline and rising atmospheric CO2 control AMOC sensitivity to deglacial meltwater discharge. Global and Planetary Change 210 , 103755. 10.1016/j.gloplacha.2022.103755 https://doi.org/10.1016/j.gloplacha.2022.103755 file https://orca.cardiff.ac.uk/147752/1/SunY2022DeglacialAMOCSensitivityGPC.pdf doi:10.1016/j.gloplacha.2022.103755 |
op_rights |
cc_by |
op_rightsnorm |
CC-BY |
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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1766030857124970496 |