Abrupt rise in atmospheric CO 2 at the onset of the Bølling/Allerød: in-situ ice core data versus true atmospheric signals
International audience During the last glacial/interglacial transition the Earth's climate underwent abrupt changes around 14.6 kyr ago. Temperature proxies from ice cores revealed the onset of the Bølling/Allerød (B/A) warm period in the north and the start of the Antarctic Cold Reversal in th...
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HAL CCSD
2011
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Online Access: | https://hal.science/hal-04113907 https://doi.org/10.5194/cp-7-473-201110.5194/cpd-6-1473-2010 |
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Open Polar |
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Muséum National d'Histoire Naturelle (MNHM): HAL |
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ftmuseumnhn |
language |
English |
topic |
Earth Science [SDU]Sciences of the Universe [physics] |
spellingShingle |
Earth Science [SDU]Sciences of the Universe [physics] Köhler, P. Knorr, G. Buiron, D. Lourantou, A. Chappellaz, J. Abrupt rise in atmospheric CO 2 at the onset of the Bølling/Allerød: in-situ ice core data versus true atmospheric signals |
topic_facet |
Earth Science [SDU]Sciences of the Universe [physics] |
description |
International audience During the last glacial/interglacial transition the Earth's climate underwent abrupt changes around 14.6 kyr ago. Temperature proxies from ice cores revealed the onset of the Bølling/Allerød (B/A) warm period in the north and the start of the Antarctic Cold Reversal in the south. Furthermore, the B/A was accompanied by a rapid sea level rise of about 20 m during meltwater pulse (MWP) 1A, whose exact timing is a matter of current debate. In-situ measured CO 2 in the EPICA Dome C (EDC) ice core also revealed a remarkable jump of 10 ± 1 ppmv in 230 yr at the same time. Allowing for the modelled age distribution of CO 2 in firn, we show that atmospheric CO 2 could have jumped by 20-35 ppmv in less than 200 yr, which is a factor of 2-3.5 greater than the CO 2 signal recorded in-situ in EDC. This rate of change in atmospheric CO 2 corresponds to 29-50% of the anthropogenic signal during the last 50 yr and is connected with a radiative forcing of 0.59-0.75 W m -2 . Using a model-based airborne fraction of 0.17 of atmospheric CO 2 , we infer that 125 Pg of carbon need to be released into the atmosphere to produce such a peak. If the abrupt rise in CO 2 at the onset of the B/A is unique with respect to other Dansgaard/Oeschger (D/O) events of the last 60 kyr (which seems plausible if not unequivocal based on current observations), then the mechanism responsible for it may also have been unique. Available δ 13 CO 2 data are neutral, whether the source of the carbon is of marine or terrestrial origin. We therefore hypothesise that most of the carbon might have been activated as a consequence of continental shelf flooding during MWP-1A. This potential impact of rapid sea level rise on atmospheric CO 2 might define the point of no return during the last deglaciation. |
author2 |
Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) École normale supérieure - Paris (ENS-PSL) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Köhler, P. Knorr, G. Buiron, D. Lourantou, A. Chappellaz, J. |
author_facet |
Köhler, P. Knorr, G. Buiron, D. Lourantou, A. Chappellaz, J. |
author_sort |
Köhler, P. |
title |
Abrupt rise in atmospheric CO 2 at the onset of the Bølling/Allerød: in-situ ice core data versus true atmospheric signals |
title_short |
Abrupt rise in atmospheric CO 2 at the onset of the Bølling/Allerød: in-situ ice core data versus true atmospheric signals |
title_full |
Abrupt rise in atmospheric CO 2 at the onset of the Bølling/Allerød: in-situ ice core data versus true atmospheric signals |
title_fullStr |
Abrupt rise in atmospheric CO 2 at the onset of the Bølling/Allerød: in-situ ice core data versus true atmospheric signals |
title_full_unstemmed |
Abrupt rise in atmospheric CO 2 at the onset of the Bølling/Allerød: in-situ ice core data versus true atmospheric signals |
title_sort |
abrupt rise in atmospheric co 2 at the onset of the bølling/allerød: in-situ ice core data versus true atmospheric signals |
publisher |
HAL CCSD |
publishDate |
2011 |
url |
https://hal.science/hal-04113907 https://doi.org/10.5194/cp-7-473-201110.5194/cpd-6-1473-2010 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic EPICA ice core |
genre_facet |
Antarc* Antarctic EPICA ice core |
op_source |
Climate of the Past https://hal.science/hal-04113907 Climate of the Past, 2011, 7, pp.473-486. ⟨10.5194/cp-7-473-201110.5194/cpd-6-1473-2010⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/cp-7-473-201110.5194/cpd-6-1473-2010 hal-04113907 https://hal.science/hal-04113907 BIBCODE: 2011CliPa.7.473K doi:10.5194/cp-7-473-201110.5194/cpd-6-1473-2010 |
op_doi |
https://doi.org/10.5194/cp-7-473-201110.5194/cpd-6-1473-2010 |
_version_ |
1769010745261948928 |
spelling |
ftmuseumnhn:oai:HAL:hal-04113907v1 2023-06-18T03:37:57+02:00 Abrupt rise in atmospheric CO 2 at the onset of the Bølling/Allerød: in-situ ice core data versus true atmospheric signals Köhler, P. Knorr, G. Buiron, D. Lourantou, A. Chappellaz, J. Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) École normale supérieure - Paris (ENS-PSL) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) 2011 https://hal.science/hal-04113907 https://doi.org/10.5194/cp-7-473-201110.5194/cpd-6-1473-2010 en eng HAL CCSD info:eu-repo/semantics/altIdentifier/doi/10.5194/cp-7-473-201110.5194/cpd-6-1473-2010 hal-04113907 https://hal.science/hal-04113907 BIBCODE: 2011CliPa.7.473K doi:10.5194/cp-7-473-201110.5194/cpd-6-1473-2010 Climate of the Past https://hal.science/hal-04113907 Climate of the Past, 2011, 7, pp.473-486. ⟨10.5194/cp-7-473-201110.5194/cpd-6-1473-2010⟩ Earth Science [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2011 ftmuseumnhn https://doi.org/10.5194/cp-7-473-201110.5194/cpd-6-1473-2010 2023-06-07T16:19:44Z International audience During the last glacial/interglacial transition the Earth's climate underwent abrupt changes around 14.6 kyr ago. Temperature proxies from ice cores revealed the onset of the Bølling/Allerød (B/A) warm period in the north and the start of the Antarctic Cold Reversal in the south. Furthermore, the B/A was accompanied by a rapid sea level rise of about 20 m during meltwater pulse (MWP) 1A, whose exact timing is a matter of current debate. In-situ measured CO 2 in the EPICA Dome C (EDC) ice core also revealed a remarkable jump of 10 ± 1 ppmv in 230 yr at the same time. Allowing for the modelled age distribution of CO 2 in firn, we show that atmospheric CO 2 could have jumped by 20-35 ppmv in less than 200 yr, which is a factor of 2-3.5 greater than the CO 2 signal recorded in-situ in EDC. This rate of change in atmospheric CO 2 corresponds to 29-50% of the anthropogenic signal during the last 50 yr and is connected with a radiative forcing of 0.59-0.75 W m -2 . Using a model-based airborne fraction of 0.17 of atmospheric CO 2 , we infer that 125 Pg of carbon need to be released into the atmosphere to produce such a peak. If the abrupt rise in CO 2 at the onset of the B/A is unique with respect to other Dansgaard/Oeschger (D/O) events of the last 60 kyr (which seems plausible if not unequivocal based on current observations), then the mechanism responsible for it may also have been unique. Available δ 13 CO 2 data are neutral, whether the source of the carbon is of marine or terrestrial origin. We therefore hypothesise that most of the carbon might have been activated as a consequence of continental shelf flooding during MWP-1A. This potential impact of rapid sea level rise on atmospheric CO 2 might define the point of no return during the last deglaciation. Article in Journal/Newspaper Antarc* Antarctic EPICA ice core Muséum National d'Histoire Naturelle (MNHM): HAL Antarctic The Antarctic |