Past temperature reconstructions from deep ice cores: relevance for future climate change
Ice cores provide unique archives of past climate and environmental changes based only on physical processes. Quantitative temperature reconstructions are essential for the comparison between ice core records and climate models. We give an overview of the methods that have been developed to reconstr...
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Online Access: | http://hdl.handle.net/10278/3536191 https://doi.org/10.5194/cp-2-145-2006 |
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ftuniveneziairis:oai:iris.unive.it:10278/3536191 2024-04-21T07:48:26+00:00 Past temperature reconstructions from deep ice cores: relevance for future climate change Masson Delmotte V. Dreyfus G. Braconnot P. Johnsen S. Jouzel J. Kageyama M. Landais A. Loutre M. F. Nouet J. Parrenin F. Raynaud D. STENNI, Barbara Teunter E. Masson Delmotte, V. Dreyfus, G. Braconnot, P. Johnsen, S. Jouzel, J. Kageyama, M. Landais, A. Loutre, M. F. Nouet, J. Parrenin, F. Raynaud, D. Stenni, Barbara Teunter, E. 2006 http://hdl.handle.net/10278/3536191 https://doi.org/10.5194/cp-2-145-2006 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000244506500008 volume:2 firstpage:145 lastpage:165 numberofpages:21 journal:CLIMATE OF THE PAST http://hdl.handle.net/10278/3536191 doi:10.5194/cp-2-145-2006 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-33750452304 https://doi.org/10.5194/cp-2-145-2006 info:eu-repo/semantics/openAccess Settore GEO/08 - Geochimica e Vulcanologia info:eu-repo/semantics/article 2006 ftuniveneziairis https://doi.org/10.5194/cp-2-145-2006 2024-03-28T01:22:18Z Ice cores provide unique archives of past climate and environmental changes based only on physical processes. Quantitative temperature reconstructions are essential for the comparison between ice core records and climate models. We give an overview of the methods that have been developed to reconstruct past local temperatures from deep ice cores and highlight several points that are relevant for future climate change. We first analyse the long term fluctuations of temperature as depicted in the long Antarctic record from EPICA Dome C. The long term imprint of obliquity changes in the EPICA Dome C record is highlighted and compared to simulations conducted with the ECBILT-CLIO intermediate complexity climate model. We discuss the comparison between the current interglacial period and the long interglacial corresponding to marine isotopic stage 11, about 400 kyr BP. Previous studies had focused on the role of precession and the thresholds required to induce glacial inceptions. We suggest that, due to the low eccentricity configuration of MIS 11 and the Holocene, the effect of precession on the incoming solar radiation is damped and that changes in obliquity must be taken into account. The EPICA Dome C alignment of terminations I and VI published in 2004 corresponds to a phasing of the obliquity signals. A conjunction of low obliquity and minimum northern hemisphere summer insolation is not found in the next tens of thousand years, supporting the idea of an unusually long interglacial ahead. As a second point relevant for future climate change, we discuss the magnitude and rate of change of past temperatures reconstructed from Greenland (NorthGRIP) and Antarctic (Dome C) ice cores. Past episodes of temperatures above the present-day values by up to 5°C are recorded at both locations during the penultimate interglacial period. The rate of polar warming simulated by coupled climate models forced by a CO2 increase of 1% per year is compared to ice-core-based temperature reconstructions. In Antarctica, the CO2-induced ... Article in Journal/Newspaper Antarc* Antarctic Antarctica EPICA Greenland ice core Università Ca’ Foscari Venezia: ARCA (Archivio Istituzionale della Ricerca) Climate of the Past 2 2 145 165 |
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Open Polar |
collection |
Università Ca’ Foscari Venezia: ARCA (Archivio Istituzionale della Ricerca) |
op_collection_id |
ftuniveneziairis |
language |
English |
topic |
Settore GEO/08 - Geochimica e Vulcanologia |
spellingShingle |
Settore GEO/08 - Geochimica e Vulcanologia Masson Delmotte V. Dreyfus G. Braconnot P. Johnsen S. Jouzel J. Kageyama M. Landais A. Loutre M. F. Nouet J. Parrenin F. Raynaud D. STENNI, Barbara Teunter E. Past temperature reconstructions from deep ice cores: relevance for future climate change |
topic_facet |
Settore GEO/08 - Geochimica e Vulcanologia |
description |
Ice cores provide unique archives of past climate and environmental changes based only on physical processes. Quantitative temperature reconstructions are essential for the comparison between ice core records and climate models. We give an overview of the methods that have been developed to reconstruct past local temperatures from deep ice cores and highlight several points that are relevant for future climate change. We first analyse the long term fluctuations of temperature as depicted in the long Antarctic record from EPICA Dome C. The long term imprint of obliquity changes in the EPICA Dome C record is highlighted and compared to simulations conducted with the ECBILT-CLIO intermediate complexity climate model. We discuss the comparison between the current interglacial period and the long interglacial corresponding to marine isotopic stage 11, about 400 kyr BP. Previous studies had focused on the role of precession and the thresholds required to induce glacial inceptions. We suggest that, due to the low eccentricity configuration of MIS 11 and the Holocene, the effect of precession on the incoming solar radiation is damped and that changes in obliquity must be taken into account. The EPICA Dome C alignment of terminations I and VI published in 2004 corresponds to a phasing of the obliquity signals. A conjunction of low obliquity and minimum northern hemisphere summer insolation is not found in the next tens of thousand years, supporting the idea of an unusually long interglacial ahead. As a second point relevant for future climate change, we discuss the magnitude and rate of change of past temperatures reconstructed from Greenland (NorthGRIP) and Antarctic (Dome C) ice cores. Past episodes of temperatures above the present-day values by up to 5°C are recorded at both locations during the penultimate interglacial period. The rate of polar warming simulated by coupled climate models forced by a CO2 increase of 1% per year is compared to ice-core-based temperature reconstructions. In Antarctica, the CO2-induced ... |
author2 |
Masson Delmotte, V. Dreyfus, G. Braconnot, P. Johnsen, S. Jouzel, J. Kageyama, M. Landais, A. Loutre, M. F. Nouet, J. Parrenin, F. Raynaud, D. Stenni, Barbara Teunter, E. |
format |
Article in Journal/Newspaper |
author |
Masson Delmotte V. Dreyfus G. Braconnot P. Johnsen S. Jouzel J. Kageyama M. Landais A. Loutre M. F. Nouet J. Parrenin F. Raynaud D. STENNI, Barbara Teunter E. |
author_facet |
Masson Delmotte V. Dreyfus G. Braconnot P. Johnsen S. Jouzel J. Kageyama M. Landais A. Loutre M. F. Nouet J. Parrenin F. Raynaud D. STENNI, Barbara Teunter E. |
author_sort |
Masson Delmotte V. |
title |
Past temperature reconstructions from deep ice cores: relevance for future climate change |
title_short |
Past temperature reconstructions from deep ice cores: relevance for future climate change |
title_full |
Past temperature reconstructions from deep ice cores: relevance for future climate change |
title_fullStr |
Past temperature reconstructions from deep ice cores: relevance for future climate change |
title_full_unstemmed |
Past temperature reconstructions from deep ice cores: relevance for future climate change |
title_sort |
past temperature reconstructions from deep ice cores: relevance for future climate change |
publishDate |
2006 |
url |
http://hdl.handle.net/10278/3536191 https://doi.org/10.5194/cp-2-145-2006 |
genre |
Antarc* Antarctic Antarctica EPICA Greenland ice core |
genre_facet |
Antarc* Antarctic Antarctica EPICA Greenland ice core |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000244506500008 volume:2 firstpage:145 lastpage:165 numberofpages:21 journal:CLIMATE OF THE PAST http://hdl.handle.net/10278/3536191 doi:10.5194/cp-2-145-2006 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-33750452304 https://doi.org/10.5194/cp-2-145-2006 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/cp-2-145-2006 |
container_title |
Climate of the Past |
container_volume |
2 |
container_issue |
2 |
container_start_page |
145 |
op_container_end_page |
165 |
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1796949512942518272 |