Proposing a mechanistic understanding of changes in atmospheric CO 2 during the last 740 000 years
International audience Atmospheric carbon dioxide (CO 2 ) measured in Antarctic ice cores shows a natural variability of 80 to 100 ppmv during the last four glacial cycles and variations of approximately 60 ppmv in the two cycles between 410 and 650 kyr BP. We here use dust and the isotopic temperat...
Main Authors: | , |
---|---|
Other Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2006
|
Subjects: | |
Online Access: | https://hal.science/hal-00298121 https://hal.science/hal-00298121/document https://hal.science/hal-00298121/file/cpd-2-1-2006.pdf |
id |
ftinsu:oai:HAL:hal-00298121v1 |
---|---|
record_format |
openpolar |
spelling |
ftinsu:oai:HAL:hal-00298121v1 2024-02-11T09:58:37+01:00 Proposing a mechanistic understanding of changes in atmospheric CO 2 during the last 740 000 years Köhler, P. Fischer, H. Department of Bentho-pelagic processes Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung = Alfred Wegener Institute for Polar and Marine Research = Institut Alfred-Wegener pour la recherche polaire et marine (AWI) Helmholtz-Gemeinschaft = Helmholtz Association-Helmholtz-Gemeinschaft = Helmholtz Association 2006-02-14 https://hal.science/hal-00298121 https://hal.science/hal-00298121/document https://hal.science/hal-00298121/file/cpd-2-1-2006.pdf en eng HAL CCSD European Geosciences Union (EGU) hal-00298121 https://hal.science/hal-00298121 https://hal.science/hal-00298121/document https://hal.science/hal-00298121/file/cpd-2-1-2006.pdf info:eu-repo/semantics/OpenAccess ISSN: 1814-9340 EISSN: 1814-9359 Climate of the Past Discussions https://hal.science/hal-00298121 Climate of the Past Discussions, 2006, 2 (1), pp.1-42 [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2006 ftinsu 2024-01-17T17:27:29Z International audience Atmospheric carbon dioxide (CO 2 ) measured in Antarctic ice cores shows a natural variability of 80 to 100 ppmv during the last four glacial cycles and variations of approximately 60 ppmv in the two cycles between 410 and 650 kyr BP. We here use dust and the isotopic temperature proxy deuterium (?D) from the EPICA Dome C Antarctic ice core covering the last 740 kyr together with other paleo-climatic records to force the ocean/atmosphere/biosphere box model of the global carbon cycle BICYCLE in a forward mode over this time in order to reconstruct the natural variability of p CO 2 . Our simulation results covered by our proposed scenario are based on process understanding gained previously for carbon cycle variations during Termination I. These results match the p CO 2 measured in the Vostok ice core well ( r 2 =0.80) and we predict prior to Termination V significantly smaller amplitudes in p CO 2 variations mainly based on a reduced interglacial ocean circulation and reduced interglacial Southern Ocean sea surface temperature. These predictions for the pre-Vostok period match the new p CO 2 data from the EPICA Dome C ice core for the time period 410 to 650 kyr BP equally well ( r 2 =0.79). This is the first forward modelling approach which covers all major processes acting on the global carbon cycle on glacial/interglacial time scales. The contributions of different processes (terrestrial carbon storage, sea ice, sea level, ocean temperature, ocean circulation, CaCO 3 chemistry, marine biota) are analysed. Article in Journal/Newspaper Antarc* Antarctic EPICA ice core Sea ice Southern Ocean Institut national des sciences de l'Univers: HAL-INSU Antarctic Southern Ocean |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Köhler, P. Fischer, H. Proposing a mechanistic understanding of changes in atmospheric CO 2 during the last 740 000 years |
topic_facet |
[SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience Atmospheric carbon dioxide (CO 2 ) measured in Antarctic ice cores shows a natural variability of 80 to 100 ppmv during the last four glacial cycles and variations of approximately 60 ppmv in the two cycles between 410 and 650 kyr BP. We here use dust and the isotopic temperature proxy deuterium (?D) from the EPICA Dome C Antarctic ice core covering the last 740 kyr together with other paleo-climatic records to force the ocean/atmosphere/biosphere box model of the global carbon cycle BICYCLE in a forward mode over this time in order to reconstruct the natural variability of p CO 2 . Our simulation results covered by our proposed scenario are based on process understanding gained previously for carbon cycle variations during Termination I. These results match the p CO 2 measured in the Vostok ice core well ( r 2 =0.80) and we predict prior to Termination V significantly smaller amplitudes in p CO 2 variations mainly based on a reduced interglacial ocean circulation and reduced interglacial Southern Ocean sea surface temperature. These predictions for the pre-Vostok period match the new p CO 2 data from the EPICA Dome C ice core for the time period 410 to 650 kyr BP equally well ( r 2 =0.79). This is the first forward modelling approach which covers all major processes acting on the global carbon cycle on glacial/interglacial time scales. The contributions of different processes (terrestrial carbon storage, sea ice, sea level, ocean temperature, ocean circulation, CaCO 3 chemistry, marine biota) are analysed. |
author2 |
Department of Bentho-pelagic processes Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung = Alfred Wegener Institute for Polar and Marine Research = Institut Alfred-Wegener pour la recherche polaire et marine (AWI) Helmholtz-Gemeinschaft = Helmholtz Association-Helmholtz-Gemeinschaft = Helmholtz Association |
format |
Article in Journal/Newspaper |
author |
Köhler, P. Fischer, H. |
author_facet |
Köhler, P. Fischer, H. |
author_sort |
Köhler, P. |
title |
Proposing a mechanistic understanding of changes in atmospheric CO 2 during the last 740 000 years |
title_short |
Proposing a mechanistic understanding of changes in atmospheric CO 2 during the last 740 000 years |
title_full |
Proposing a mechanistic understanding of changes in atmospheric CO 2 during the last 740 000 years |
title_fullStr |
Proposing a mechanistic understanding of changes in atmospheric CO 2 during the last 740 000 years |
title_full_unstemmed |
Proposing a mechanistic understanding of changes in atmospheric CO 2 during the last 740 000 years |
title_sort |
proposing a mechanistic understanding of changes in atmospheric co 2 during the last 740 000 years |
publisher |
HAL CCSD |
publishDate |
2006 |
url |
https://hal.science/hal-00298121 https://hal.science/hal-00298121/document https://hal.science/hal-00298121/file/cpd-2-1-2006.pdf |
geographic |
Antarctic Southern Ocean |
geographic_facet |
Antarctic Southern Ocean |
genre |
Antarc* Antarctic EPICA ice core Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic EPICA ice core Sea ice Southern Ocean |
op_source |
ISSN: 1814-9340 EISSN: 1814-9359 Climate of the Past Discussions https://hal.science/hal-00298121 Climate of the Past Discussions, 2006, 2 (1), pp.1-42 |
op_relation |
hal-00298121 https://hal.science/hal-00298121 https://hal.science/hal-00298121/document https://hal.science/hal-00298121/file/cpd-2-1-2006.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1790594328429592576 |