Atmospheric CO2 in the late Quaternary
Ice cores provide the only direct way of determining past concentrations of atmospheric CO2. In the absence of artefacts (which is generally the case in Antarctic ice cores), the air extracted from ice gives a direct measure of the CO2 concentration. The ice core record has now been extended back be...
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ftawi:oai:epic.awi.de:15594 2023-05-15T13:39:47+02:00 Atmospheric CO2 in the late Quaternary Wolff, E. Siegenthaler, U. Raynaud, D. Barnola, J. M. Chappellaz, J. Luethi, D. Stocker, T. F. Fischer, Hubertus Köhler, Peter 2006 https://epic.awi.de/id/eprint/15594/ https://hdl.handle.net/10013/epic.25710 unknown Wolff, E. , Siegenthaler, U. , Raynaud, D. , Barnola, J. M. , Chappellaz, J. , Luethi, D. , Stocker, T. F. , Fischer, H. and Köhler, P. orcid:0000-0003-0904-8484 (2006) Atmospheric CO2 in the late Quaternary , Eos Trans. AGU,87(52), Fall Meet. Suppl., Abstract PP23E-07, 2006. 11-15 Dec 2006, San Francisco, USA. . hdl:10013/epic.25710 EPIC3Eos Trans. AGU,87(52), Fall Meet. Suppl., Abstract PP23E-07, 2006. 11-15 Dec 2006, San Francisco, USA. Conference notRev 2006 ftawi 2021-12-24T15:31:22Z Ice cores provide the only direct way of determining past concentrations of atmospheric CO2. In the absence of artefacts (which is generally the case in Antarctic ice cores), the air extracted from ice gives a direct measure of the CO2 concentration. The ice core record has now been extended back beyond 650,000 years in the past, using the core from Dome C retrieved by the European Project for Ice Coring in Antarctica (EPICA). CO2 rises and falls in very close connection to Antarctic climate throughout this period, between a range of about 180 ppmv in the coldest glacials and 300 ppmv in the warmest interglacials (Siegenthaler et al., Science, 2005). Lower interglacial concentrations match colder interglacial climates in the part of the record before 450,000 years. No long-term trend in the average value is apparent so far. The close CO2-climate connection is consistent with a system in positive feedback, with CO2 acting as one of a number of amplifiers in glacial-interglacial climate change. However, the exact mechanisms controlling the CO2 changes remain uncertain, and a number of candidates in the physical and biogeochemical realm were considered in the EPICA challenge (Wolff et al., Eos, 2005). Modelling and data can to some extent constrain the possibilities, and the Southern Ocean is almost certainly of greatest importance, but the uncertainties mean that the CO2 changes cannot yet be confidently ascribed to any single mechanism or combination of mechanisms. Conference Object Antarc* Antarctic Antarctica EPICA ice core Southern Ocean Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Antarctic Southern Ocean |
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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 |
Ice cores provide the only direct way of determining past concentrations of atmospheric CO2. In the absence of artefacts (which is generally the case in Antarctic ice cores), the air extracted from ice gives a direct measure of the CO2 concentration. The ice core record has now been extended back beyond 650,000 years in the past, using the core from Dome C retrieved by the European Project for Ice Coring in Antarctica (EPICA). CO2 rises and falls in very close connection to Antarctic climate throughout this period, between a range of about 180 ppmv in the coldest glacials and 300 ppmv in the warmest interglacials (Siegenthaler et al., Science, 2005). Lower interglacial concentrations match colder interglacial climates in the part of the record before 450,000 years. No long-term trend in the average value is apparent so far. The close CO2-climate connection is consistent with a system in positive feedback, with CO2 acting as one of a number of amplifiers in glacial-interglacial climate change. However, the exact mechanisms controlling the CO2 changes remain uncertain, and a number of candidates in the physical and biogeochemical realm were considered in the EPICA challenge (Wolff et al., Eos, 2005). Modelling and data can to some extent constrain the possibilities, and the Southern Ocean is almost certainly of greatest importance, but the uncertainties mean that the CO2 changes cannot yet be confidently ascribed to any single mechanism or combination of mechanisms. |
format |
Conference Object |
author |
Wolff, E. Siegenthaler, U. Raynaud, D. Barnola, J. M. Chappellaz, J. Luethi, D. Stocker, T. F. Fischer, Hubertus Köhler, Peter |
spellingShingle |
Wolff, E. Siegenthaler, U. Raynaud, D. Barnola, J. M. Chappellaz, J. Luethi, D. Stocker, T. F. Fischer, Hubertus Köhler, Peter Atmospheric CO2 in the late Quaternary |
author_facet |
Wolff, E. Siegenthaler, U. Raynaud, D. Barnola, J. M. Chappellaz, J. Luethi, D. Stocker, T. F. Fischer, Hubertus Köhler, Peter |
author_sort |
Wolff, E. |
title |
Atmospheric CO2 in the late Quaternary |
title_short |
Atmospheric CO2 in the late Quaternary |
title_full |
Atmospheric CO2 in the late Quaternary |
title_fullStr |
Atmospheric CO2 in the late Quaternary |
title_full_unstemmed |
Atmospheric CO2 in the late Quaternary |
title_sort |
atmospheric co2 in the late quaternary |
publishDate |
2006 |
url |
https://epic.awi.de/id/eprint/15594/ https://hdl.handle.net/10013/epic.25710 |
geographic |
Antarctic Southern Ocean |
geographic_facet |
Antarctic Southern Ocean |
genre |
Antarc* Antarctic Antarctica EPICA ice core Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctica EPICA ice core Southern Ocean |
op_source |
EPIC3Eos Trans. AGU,87(52), Fall Meet. Suppl., Abstract PP23E-07, 2006. 11-15 Dec 2006, San Francisco, USA. |
op_relation |
Wolff, E. , Siegenthaler, U. , Raynaud, D. , Barnola, J. M. , Chappellaz, J. , Luethi, D. , Stocker, T. F. , Fischer, H. and Köhler, P. orcid:0000-0003-0904-8484 (2006) Atmospheric CO2 in the late Quaternary , Eos Trans. AGU,87(52), Fall Meet. Suppl., Abstract PP23E-07, 2006. 11-15 Dec 2006, San Francisco, USA. . hdl:10013/epic.25710 |
_version_ |
1766123940452761600 |