Sensitivity of interglacial Greenland temperature and δ 18 O: ice core data, orbital and increased CO 2 climate simulations
The sensitivity of interglacial Greenland temperature to orbital and CO 2 forcing is investigated using the NorthGRIP ice core data and coupled ocean-atmosphere IPSL-CM4 model simulations. These simulations were conducted in response to different interglacial orbital configurations, and to increased...
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Language: | English |
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2011
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Online Access: | https://doi.org/10.5194/cp-7-1041-2011 https://doaj.org/article/69cb6b46fbe14664a7b997b1080e32e5 |
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ftdoajarticles:oai:doaj.org/article:69cb6b46fbe14664a7b997b1080e32e5 2023-05-15T15:02:00+02:00 Sensitivity of interglacial Greenland temperature and δ 18 O: ice core data, orbital and increased CO 2 climate simulations D. Swingedouw J. Sjolte C. Risi L. Sime Q. Lejeune A. Landais M. Kageyama J. Jouzel G. Hoffmann P. Braconnot V. Masson-Delmotte B. Vinther 2011-09-01T00:00:00Z https://doi.org/10.5194/cp-7-1041-2011 https://doaj.org/article/69cb6b46fbe14664a7b997b1080e32e5 EN eng Copernicus Publications http://www.clim-past.net/7/1041/2011/cp-7-1041-2011.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-7-1041-2011 1814-9324 1814-9332 https://doaj.org/article/69cb6b46fbe14664a7b997b1080e32e5 Climate of the Past, Vol 7, Iss 3, Pp 1041-1059 (2011) Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 article 2011 ftdoajarticles https://doi.org/10.5194/cp-7-1041-2011 2022-12-30T23:40:12Z The sensitivity of interglacial Greenland temperature to orbital and CO 2 forcing is investigated using the NorthGRIP ice core data and coupled ocean-atmosphere IPSL-CM4 model simulations. These simulations were conducted in response to different interglacial orbital configurations, and to increased CO 2 concentrations. These different forcings cause very distinct simulated seasonal and latitudinal temperature and water cycle changes, limiting the analogies between the last interglacial and future climate. However, the IPSL-CM4 model shows similar magnitudes of Arctic summer warming and climate feedbacks in response to 2 × CO 2 and orbital forcing of the last interglacial period (126 000 years ago). The IPSL-CM4 model produces a remarkably linear relationship between TOA incoming summer solar radiation and simulated changes in summer and annual mean central Greenland temperature. This contrasts with the stable isotope record from the Greenland ice cores, showing a multi-millennial lagged response to summer insolation. During the early part of interglacials, the observed lags may be explained by ice sheet-ocean feedbacks linked with changes in ice sheet elevation and the impact of meltwater on ocean circulation, as investigated with sensitivity studies. A quantitative comparison between ice core data and climate simulations requires stability of the stable isotope – temperature relationship to be explored. Atmospheric simulations including water stable isotopes have been conducted with the LMDZiso model under different boundary conditions. This set of simulations allows calculation of a temporal Greenland isotope-temperature slope (0.3–0.4‰ per °C) during warmer-than-present Arctic climates, in response to increased CO 2 , increased ocean temperature and orbital forcing. This temporal slope appears half as large as the modern spatial gradient and is consistent with other ice core estimates. It may, however, be model-dependent, as indicated by preliminary comparison with other models. This suggests that further ... Article in Journal/Newspaper Arctic Greenland Greenland ice cores ice core Ice Sheet Directory of Open Access Journals: DOAJ Articles Arctic Greenland Climate of the Past 7 3 1041 1059 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
spellingShingle |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 D. Swingedouw J. Sjolte C. Risi L. Sime Q. Lejeune A. Landais M. Kageyama J. Jouzel G. Hoffmann P. Braconnot V. Masson-Delmotte B. Vinther Sensitivity of interglacial Greenland temperature and δ 18 O: ice core data, orbital and increased CO 2 climate simulations |
topic_facet |
Environmental pollution TD172-193.5 Environmental protection TD169-171.8 Environmental sciences GE1-350 |
description |
The sensitivity of interglacial Greenland temperature to orbital and CO 2 forcing is investigated using the NorthGRIP ice core data and coupled ocean-atmosphere IPSL-CM4 model simulations. These simulations were conducted in response to different interglacial orbital configurations, and to increased CO 2 concentrations. These different forcings cause very distinct simulated seasonal and latitudinal temperature and water cycle changes, limiting the analogies between the last interglacial and future climate. However, the IPSL-CM4 model shows similar magnitudes of Arctic summer warming and climate feedbacks in response to 2 × CO 2 and orbital forcing of the last interglacial period (126 000 years ago). The IPSL-CM4 model produces a remarkably linear relationship between TOA incoming summer solar radiation and simulated changes in summer and annual mean central Greenland temperature. This contrasts with the stable isotope record from the Greenland ice cores, showing a multi-millennial lagged response to summer insolation. During the early part of interglacials, the observed lags may be explained by ice sheet-ocean feedbacks linked with changes in ice sheet elevation and the impact of meltwater on ocean circulation, as investigated with sensitivity studies. A quantitative comparison between ice core data and climate simulations requires stability of the stable isotope – temperature relationship to be explored. Atmospheric simulations including water stable isotopes have been conducted with the LMDZiso model under different boundary conditions. This set of simulations allows calculation of a temporal Greenland isotope-temperature slope (0.3–0.4‰ per °C) during warmer-than-present Arctic climates, in response to increased CO 2 , increased ocean temperature and orbital forcing. This temporal slope appears half as large as the modern spatial gradient and is consistent with other ice core estimates. It may, however, be model-dependent, as indicated by preliminary comparison with other models. This suggests that further ... |
format |
Article in Journal/Newspaper |
author |
D. Swingedouw J. Sjolte C. Risi L. Sime Q. Lejeune A. Landais M. Kageyama J. Jouzel G. Hoffmann P. Braconnot V. Masson-Delmotte B. Vinther |
author_facet |
D. Swingedouw J. Sjolte C. Risi L. Sime Q. Lejeune A. Landais M. Kageyama J. Jouzel G. Hoffmann P. Braconnot V. Masson-Delmotte B. Vinther |
author_sort |
D. Swingedouw |
title |
Sensitivity of interglacial Greenland temperature and δ 18 O: ice core data, orbital and increased CO 2 climate simulations |
title_short |
Sensitivity of interglacial Greenland temperature and δ 18 O: ice core data, orbital and increased CO 2 climate simulations |
title_full |
Sensitivity of interglacial Greenland temperature and δ 18 O: ice core data, orbital and increased CO 2 climate simulations |
title_fullStr |
Sensitivity of interglacial Greenland temperature and δ 18 O: ice core data, orbital and increased CO 2 climate simulations |
title_full_unstemmed |
Sensitivity of interglacial Greenland temperature and δ 18 O: ice core data, orbital and increased CO 2 climate simulations |
title_sort |
sensitivity of interglacial greenland temperature and δ 18 o: ice core data, orbital and increased co 2 climate simulations |
publisher |
Copernicus Publications |
publishDate |
2011 |
url |
https://doi.org/10.5194/cp-7-1041-2011 https://doaj.org/article/69cb6b46fbe14664a7b997b1080e32e5 |
geographic |
Arctic Greenland |
geographic_facet |
Arctic Greenland |
genre |
Arctic Greenland Greenland ice cores ice core Ice Sheet |
genre_facet |
Arctic Greenland Greenland ice cores ice core Ice Sheet |
op_source |
Climate of the Past, Vol 7, Iss 3, Pp 1041-1059 (2011) |
op_relation |
http://www.clim-past.net/7/1041/2011/cp-7-1041-2011.pdf https://doaj.org/toc/1814-9324 https://doaj.org/toc/1814-9332 doi:10.5194/cp-7-1041-2011 1814-9324 1814-9332 https://doaj.org/article/69cb6b46fbe14664a7b997b1080e32e5 |
op_doi |
https://doi.org/10.5194/cp-7-1041-2011 |
container_title |
Climate of the Past |
container_volume |
7 |
container_issue |
3 |
container_start_page |
1041 |
op_container_end_page |
1059 |
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1766334008126341120 |