Sensitivity of interglacial Greenland temperature and δ 18O : 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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Format: | Article in Journal/Newspaper |
Language: | English |
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Copernicus GmbH
2011
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Online Access: | https://lup.lub.lu.se/record/44745624-7891-456c-9a0c-d6594d0d6cda https://doi.org/10.5194/cp-7-1041-2011 |
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ftulundlup:oai:lup.lub.lu.se:44745624-7891-456c-9a0c-d6594d0d6cda 2023-05-15T15:02:10+02:00 Sensitivity of interglacial Greenland temperature and δ 18O : Ice core data, orbital and increased CO 2 climate simulations Masson-Delmotte, V. Braconnot, P. Hoffmann, G. Jouzel, J. Kageyama, M. Landais, A. Lejeune, Q. Risi, C. Sime, L. Sjolte, J. Swingedouw, D. Vinther, B. 2011-10-06 https://lup.lub.lu.se/record/44745624-7891-456c-9a0c-d6594d0d6cda https://doi.org/10.5194/cp-7-1041-2011 eng eng Copernicus GmbH https://lup.lub.lu.se/record/44745624-7891-456c-9a0c-d6594d0d6cda http://dx.doi.org/10.5194/cp-7-1041-2011 scopus:80053427416 Climate of the Past; 7(3), pp 1041-1059 (2011) ISSN: 1814-9324 Climate Research contributiontojournal/article info:eu-repo/semantics/article text 2011 ftulundlup https://doi.org/10.5194/cp-7-1041-2011 2023-02-01T23:37:23Z 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 Lund University Publications (LUP) Arctic Greenland Climate of the Past 7 3 1041 1059 |
institution |
Open Polar |
collection |
Lund University Publications (LUP) |
op_collection_id |
ftulundlup |
language |
English |
topic |
Climate Research |
spellingShingle |
Climate Research Masson-Delmotte, V. Braconnot, P. Hoffmann, G. Jouzel, J. Kageyama, M. Landais, A. Lejeune, Q. Risi, C. Sime, L. Sjolte, J. Swingedouw, D. Vinther, B. Sensitivity of interglacial Greenland temperature and δ 18O : Ice core data, orbital and increased CO 2 climate simulations |
topic_facet |
Climate Research |
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 |
Masson-Delmotte, V. Braconnot, P. Hoffmann, G. Jouzel, J. Kageyama, M. Landais, A. Lejeune, Q. Risi, C. Sime, L. Sjolte, J. Swingedouw, D. Vinther, B. |
author_facet |
Masson-Delmotte, V. Braconnot, P. Hoffmann, G. Jouzel, J. Kageyama, M. Landais, A. Lejeune, Q. Risi, C. Sime, L. Sjolte, J. Swingedouw, D. Vinther, B. |
author_sort |
Masson-Delmotte, V. |
title |
Sensitivity of interglacial Greenland temperature and δ 18O : Ice core data, orbital and increased CO 2 climate simulations |
title_short |
Sensitivity of interglacial Greenland temperature and δ 18O : Ice core data, orbital and increased CO 2 climate simulations |
title_full |
Sensitivity of interglacial Greenland temperature and δ 18O : Ice core data, orbital and increased CO 2 climate simulations |
title_fullStr |
Sensitivity of interglacial Greenland temperature and δ 18O : Ice core data, orbital and increased CO 2 climate simulations |
title_full_unstemmed |
Sensitivity of interglacial Greenland temperature and δ 18O : Ice core data, orbital and increased CO 2 climate simulations |
title_sort |
sensitivity of interglacial greenland temperature and δ 18o : ice core data, orbital and increased co 2 climate simulations |
publisher |
Copernicus GmbH |
publishDate |
2011 |
url |
https://lup.lub.lu.se/record/44745624-7891-456c-9a0c-d6594d0d6cda https://doi.org/10.5194/cp-7-1041-2011 |
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; 7(3), pp 1041-1059 (2011) ISSN: 1814-9324 |
op_relation |
https://lup.lub.lu.se/record/44745624-7891-456c-9a0c-d6594d0d6cda http://dx.doi.org/10.5194/cp-7-1041-2011 scopus:80053427416 |
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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1766334151102824448 |