Enhanced Volcanic Degassing Decoupled Atmospheric CO2 and Temperature During the Last Interglacial-Glacial Transition
Evidence from the joint interpretation of proxy data as well as geodynamical and biogeochemical modeling results point to complex interactions between sea level drawdown, volcanic degassing, and atmospheric CO2 that hampered the climate system’s decent into the last ice age. Ice core data shows that...
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ftawi:oai:epic.awi.de:39315 2024-09-15T17:47:05+00:00 Enhanced Volcanic Degassing Decoupled Atmospheric CO2 and Temperature During the Last Interglacial-Glacial Transition Rüpke, L. Knorr, Gregor Hasenclever, J. Köhler, Peter Morgan, J. Garofalo, K. Barker, S. Lohmann, Gerrit Hall, I. 2015-12-15 https://epic.awi.de/id/eprint/39315/ https://agu.confex.com/agu/fm15/meetingapp.cgi/Paper/74897 https://hdl.handle.net/10013/epic.46500 unknown Rüpke, L. , Knorr, G. orcid:0000-0002-8317-5046 , Hasenclever, J. , Köhler, P. orcid:0000-0003-0904-8484 , Morgan, J. , Garofalo, K. , Barker, S. , Lohmann, G. orcid:0000-0003-2089-733X and Hall, I. (2015) Enhanced Volcanic Degassing Decoupled Atmospheric CO2 and Temperature During the Last Interglacial-Glacial Transition , AGU Fall Meeting, San Francisco, USA, 14 December 2016 - 18 December 2016 . hdl:10013/epic.46500 EPIC3AGU Fall Meeting, San Francisco, USA, 2016-12-14-2016-12-18 Conference notRev 2015 ftawi 2024-06-24T04:13:16Z Evidence from the joint interpretation of proxy data as well as geodynamical and biogeochemical modeling results point to complex interactions between sea level drawdown, volcanic degassing, and atmospheric CO2 that hampered the climate system’s decent into the last ice age. Ice core data shows that atmospheric CO2 dropped abruptly into glacial Marine Isotope Stage (MIS) 4 at ~71 ka, while Antarctic temperatures display a more gradual decline between ~85 ka to ~71 ka across the MIS 5/4 transition. Based on 2D and 3D geodynamical simulations, we show that a ~60-100 m sea level drop associated with the MIS 5/4 transition led to a significant increase in magma and possibly CO2 flux at mid-ocean ridges (MOR) and oceanic hotspot volcanoes. The MOR signal is assessed with 2D thermomechanical models that account for mantle melting and resolve the flux of incompatible carbon dioxide. These models have been run at different spreading rates and integrated with the global distribution of opening rates to compute global variations in magma and CO2 flux across the MIS 5/4 transition. 3D plume models have been used to quantify the impact of a dropping sea level on oceanic hotspot melting and CO2 release. Here a wide range of simulations with differing plume fluxes, lithospheric thicknesses as well as speeds, and plume excess temperatures have been integrated with data from ~40 hotspots in order to compute a global signal. Biogeochemical carbon cycle modeling shows that the predicted increase in volcanic emissions is likely to have raised atmospheric CO2 by up to 15 ppmv, sufficient to explain the bulk of the decoupling between temperature and atmospheric CO2 during the global change to pronounced glacial conditions across the MIS 5/4 transition. Conference Object Antarc* Antarctic ice core Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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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 |
Evidence from the joint interpretation of proxy data as well as geodynamical and biogeochemical modeling results point to complex interactions between sea level drawdown, volcanic degassing, and atmospheric CO2 that hampered the climate system’s decent into the last ice age. Ice core data shows that atmospheric CO2 dropped abruptly into glacial Marine Isotope Stage (MIS) 4 at ~71 ka, while Antarctic temperatures display a more gradual decline between ~85 ka to ~71 ka across the MIS 5/4 transition. Based on 2D and 3D geodynamical simulations, we show that a ~60-100 m sea level drop associated with the MIS 5/4 transition led to a significant increase in magma and possibly CO2 flux at mid-ocean ridges (MOR) and oceanic hotspot volcanoes. The MOR signal is assessed with 2D thermomechanical models that account for mantle melting and resolve the flux of incompatible carbon dioxide. These models have been run at different spreading rates and integrated with the global distribution of opening rates to compute global variations in magma and CO2 flux across the MIS 5/4 transition. 3D plume models have been used to quantify the impact of a dropping sea level on oceanic hotspot melting and CO2 release. Here a wide range of simulations with differing plume fluxes, lithospheric thicknesses as well as speeds, and plume excess temperatures have been integrated with data from ~40 hotspots in order to compute a global signal. Biogeochemical carbon cycle modeling shows that the predicted increase in volcanic emissions is likely to have raised atmospheric CO2 by up to 15 ppmv, sufficient to explain the bulk of the decoupling between temperature and atmospheric CO2 during the global change to pronounced glacial conditions across the MIS 5/4 transition. |
format |
Conference Object |
author |
Rüpke, L. Knorr, Gregor Hasenclever, J. Köhler, Peter Morgan, J. Garofalo, K. Barker, S. Lohmann, Gerrit Hall, I. |
spellingShingle |
Rüpke, L. Knorr, Gregor Hasenclever, J. Köhler, Peter Morgan, J. Garofalo, K. Barker, S. Lohmann, Gerrit Hall, I. Enhanced Volcanic Degassing Decoupled Atmospheric CO2 and Temperature During the Last Interglacial-Glacial Transition |
author_facet |
Rüpke, L. Knorr, Gregor Hasenclever, J. Köhler, Peter Morgan, J. Garofalo, K. Barker, S. Lohmann, Gerrit Hall, I. |
author_sort |
Rüpke, L. |
title |
Enhanced Volcanic Degassing Decoupled Atmospheric CO2 and Temperature During the Last Interglacial-Glacial Transition |
title_short |
Enhanced Volcanic Degassing Decoupled Atmospheric CO2 and Temperature During the Last Interglacial-Glacial Transition |
title_full |
Enhanced Volcanic Degassing Decoupled Atmospheric CO2 and Temperature During the Last Interglacial-Glacial Transition |
title_fullStr |
Enhanced Volcanic Degassing Decoupled Atmospheric CO2 and Temperature During the Last Interglacial-Glacial Transition |
title_full_unstemmed |
Enhanced Volcanic Degassing Decoupled Atmospheric CO2 and Temperature During the Last Interglacial-Glacial Transition |
title_sort |
enhanced volcanic degassing decoupled atmospheric co2 and temperature during the last interglacial-glacial transition |
publishDate |
2015 |
url |
https://epic.awi.de/id/eprint/39315/ https://agu.confex.com/agu/fm15/meetingapp.cgi/Paper/74897 https://hdl.handle.net/10013/epic.46500 |
genre |
Antarc* Antarctic ice core |
genre_facet |
Antarc* Antarctic ice core |
op_source |
EPIC3AGU Fall Meeting, San Francisco, USA, 2016-12-14-2016-12-18 |
op_relation |
Rüpke, L. , Knorr, G. orcid:0000-0002-8317-5046 , Hasenclever, J. , Köhler, P. orcid:0000-0003-0904-8484 , Morgan, J. , Garofalo, K. , Barker, S. , Lohmann, G. orcid:0000-0003-2089-733X and Hall, I. (2015) Enhanced Volcanic Degassing Decoupled Atmospheric CO2 and Temperature During the Last Interglacial-Glacial Transition , AGU Fall Meeting, San Francisco, USA, 14 December 2016 - 18 December 2016 . hdl:10013/epic.46500 |
_version_ |
1810495681841856512 |