Sea level fall during glaciation stabilized atmospheric CO2 by enhanced volcanic degassing
Paleo-climate records and geodynamic modelling indicate the existence of complex interactions between glacial sea level changes, volcanic degassing and atmospheric CO2, which may have modulated the climate system's descent into the last ice age. Between ∼85 and 70 kyr ago, during an interval of...
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Nature Research
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Online Access: | https://oceanrep.geomar.de/id/eprint/38828/ https://oceanrep.geomar.de/id/eprint/38828/1/ncomms15867.pdf https://oceanrep.geomar.de/id/eprint/38828/2/ncomms15867-s1.pdf https://doi.org/10.1038/ncomms15867 |
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ftoceanrep:oai:oceanrep.geomar.de:38828 2023-05-15T13:37:37+02:00 Sea level fall during glaciation stabilized atmospheric CO2 by enhanced volcanic degassing Hasenclever, Jörg Knorr, Gregor Rüpke, Lars H. Köhler, Peter Morgan, Jason Garofalo, Kristin Barker, Stephen Lohmann, Gerrit Hall, Ian R. 2017-07-06 text https://oceanrep.geomar.de/id/eprint/38828/ https://oceanrep.geomar.de/id/eprint/38828/1/ncomms15867.pdf https://oceanrep.geomar.de/id/eprint/38828/2/ncomms15867-s1.pdf https://doi.org/10.1038/ncomms15867 en eng Nature Research https://oceanrep.geomar.de/id/eprint/38828/1/ncomms15867.pdf https://oceanrep.geomar.de/id/eprint/38828/2/ncomms15867-s1.pdf Hasenclever, J., Knorr, G., Rüpke, L. H. , Köhler, P., Morgan, J., Garofalo, K., Barker, S., Lohmann, G. and Hall, I. R. (2017) Sea level fall during glaciation stabilized atmospheric CO2 by enhanced volcanic degassing. Open Access Nature Communications, 8 (15867). DOI 10.1038/ncomms15867 <https://doi.org/10.1038/ncomms15867>. doi:10.1038/ncomms15867 cc_by_4.0 info:eu-repo/semantics/openAccess Article PeerReviewed 2017 ftoceanrep https://doi.org/10.1038/ncomms15867 2023-04-07T15:34:28Z Paleo-climate records and geodynamic modelling indicate the existence of complex interactions between glacial sea level changes, volcanic degassing and atmospheric CO2, which may have modulated the climate system's descent into the last ice age. Between ∼85 and 70 kyr ago, during an interval of decreasing axial tilt, the orbital component in global temperature records gradually declined, while atmospheric CO2, instead of continuing its long-term correlation with Antarctic temperature, remained relatively stable. Here, based on novel global geodynamic models and the joint interpretation of paleo-proxy data as well as biogeochemical simulations, we show that a sea level fall in this interval caused enhanced pressure-release melting in the uppermost mantle, which may have induced a surge in magma and CO2 fluxes from mid-ocean ridges and oceanic hotspot volcanoes. Our results reveal a hitherto unrecognized negative feedback between glaciation and atmospheric CO2 predominantly controlled by marine volcanism on multi-millennial timescales of ∼5,000-15,000 years. Article in Journal/Newspaper Antarc* Antarctic OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Antarctic Nature Communications 8 1 |
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OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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ftoceanrep |
language |
English |
description |
Paleo-climate records and geodynamic modelling indicate the existence of complex interactions between glacial sea level changes, volcanic degassing and atmospheric CO2, which may have modulated the climate system's descent into the last ice age. Between ∼85 and 70 kyr ago, during an interval of decreasing axial tilt, the orbital component in global temperature records gradually declined, while atmospheric CO2, instead of continuing its long-term correlation with Antarctic temperature, remained relatively stable. Here, based on novel global geodynamic models and the joint interpretation of paleo-proxy data as well as biogeochemical simulations, we show that a sea level fall in this interval caused enhanced pressure-release melting in the uppermost mantle, which may have induced a surge in magma and CO2 fluxes from mid-ocean ridges and oceanic hotspot volcanoes. Our results reveal a hitherto unrecognized negative feedback between glaciation and atmospheric CO2 predominantly controlled by marine volcanism on multi-millennial timescales of ∼5,000-15,000 years. |
format |
Article in Journal/Newspaper |
author |
Hasenclever, Jörg Knorr, Gregor Rüpke, Lars H. Köhler, Peter Morgan, Jason Garofalo, Kristin Barker, Stephen Lohmann, Gerrit Hall, Ian R. |
spellingShingle |
Hasenclever, Jörg Knorr, Gregor Rüpke, Lars H. Köhler, Peter Morgan, Jason Garofalo, Kristin Barker, Stephen Lohmann, Gerrit Hall, Ian R. Sea level fall during glaciation stabilized atmospheric CO2 by enhanced volcanic degassing |
author_facet |
Hasenclever, Jörg Knorr, Gregor Rüpke, Lars H. Köhler, Peter Morgan, Jason Garofalo, Kristin Barker, Stephen Lohmann, Gerrit Hall, Ian R. |
author_sort |
Hasenclever, Jörg |
title |
Sea level fall during glaciation stabilized atmospheric CO2 by enhanced volcanic degassing |
title_short |
Sea level fall during glaciation stabilized atmospheric CO2 by enhanced volcanic degassing |
title_full |
Sea level fall during glaciation stabilized atmospheric CO2 by enhanced volcanic degassing |
title_fullStr |
Sea level fall during glaciation stabilized atmospheric CO2 by enhanced volcanic degassing |
title_full_unstemmed |
Sea level fall during glaciation stabilized atmospheric CO2 by enhanced volcanic degassing |
title_sort |
sea level fall during glaciation stabilized atmospheric co2 by enhanced volcanic degassing |
publisher |
Nature Research |
publishDate |
2017 |
url |
https://oceanrep.geomar.de/id/eprint/38828/ https://oceanrep.geomar.de/id/eprint/38828/1/ncomms15867.pdf https://oceanrep.geomar.de/id/eprint/38828/2/ncomms15867-s1.pdf https://doi.org/10.1038/ncomms15867 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
https://oceanrep.geomar.de/id/eprint/38828/1/ncomms15867.pdf https://oceanrep.geomar.de/id/eprint/38828/2/ncomms15867-s1.pdf Hasenclever, J., Knorr, G., Rüpke, L. H. , Köhler, P., Morgan, J., Garofalo, K., Barker, S., Lohmann, G. and Hall, I. R. (2017) Sea level fall during glaciation stabilized atmospheric CO2 by enhanced volcanic degassing. Open Access Nature Communications, 8 (15867). DOI 10.1038/ncomms15867 <https://doi.org/10.1038/ncomms15867>. doi:10.1038/ncomms15867 |
op_rights |
cc_by_4.0 info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1038/ncomms15867 |
container_title |
Nature Communications |
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8 |
container_issue |
1 |
_version_ |
1766094971549515776 |