Sensitivity of interglacial Greenland temperature and δ18O: ice core data, orbital and increased CO2 climate simulations
The sensitivity of interglacial Greenland temperature to orbital and CO2 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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Online Access: | https://doi.org/10.5194/cp-7-1041-2011 https://cp.copernicus.org/articles/7/1041/2011/ |
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fttriple:oai:gotriple.eu:_i3eGQumvt0C7_nQ8dQ_v 2023-05-15T15:02:05+02:00 Sensitivity of interglacial Greenland temperature and δ18O: ice core data, orbital and increased CO2 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. 2018-09-27 https://doi.org/10.5194/cp-7-1041-2011 https://cp.copernicus.org/articles/7/1041/2011/ en eng Copernicus Publications doi:10.5194/cp-7-1041-2011 10670/1.ilowvr 1814-9324 1814-9332 https://cp.copernicus.org/articles/7/1041/2011/ other undefined Geographica Helvetica - geography eISSN: 1814-9332 geo envir Other https://vocabularies.coar-repositories.org/resource_types/c_1843/ Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2018 fttriple https://doi.org/10.5194/cp-7-1041-2011 2023-01-22T17:51:50Z The sensitivity of interglacial Greenland temperature to orbital and CO2 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 CO2 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 × CO2 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 CO2, 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 Unknown Arctic Greenland Climate of the Past 7 3 1041 1059 |
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op_collection_id |
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language |
English |
topic |
geo envir |
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geo envir 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 δ18O: ice core data, orbital and increased CO2 climate simulations |
topic_facet |
geo envir |
description |
The sensitivity of interglacial Greenland temperature to orbital and CO2 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 CO2 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 × CO2 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 CO2, 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 δ18O: ice core data, orbital and increased CO2 climate simulations |
title_short |
Sensitivity of interglacial Greenland temperature and δ18O: ice core data, orbital and increased CO2 climate simulations |
title_full |
Sensitivity of interglacial Greenland temperature and δ18O: ice core data, orbital and increased CO2 climate simulations |
title_fullStr |
Sensitivity of interglacial Greenland temperature and δ18O: ice core data, orbital and increased CO2 climate simulations |
title_full_unstemmed |
Sensitivity of interglacial Greenland temperature and δ18O: ice core data, orbital and increased CO2 climate simulations |
title_sort |
sensitivity of interglacial greenland temperature and δ18o: ice core data, orbital and increased co2 climate simulations |
publisher |
Copernicus Publications |
publishDate |
2018 |
url |
https://doi.org/10.5194/cp-7-1041-2011 https://cp.copernicus.org/articles/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 |
Geographica Helvetica - geography eISSN: 1814-9332 |
op_relation |
doi:10.5194/cp-7-1041-2011 10670/1.ilowvr 1814-9324 1814-9332 https://cp.copernicus.org/articles/7/1041/2011/ |
op_rights |
other undefined |
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 |
_version_ |
1766334082993618944 |