How did Marine Isotope Stage 3 and Last Glacial Maximum climates differ? – Perspectives from equilibrium simulations
International audience Dansgaard-Oeschger events occurred frequently during Marine Isotope Stage 3 (MIS3), as opposed to the following MIS2 period, which included the Last Glacial Maximum (LGM). Transient climate model simulations suggest that these abrupt warming events in Greenland and the North A...
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Online Access: | https://hal.science/hal-03199345 https://hal.science/hal-03199345/document https://hal.science/hal-03199345/file/cp-5-33-2009.pdf https://doi.org/10.5194/cp-5-33-2009 |
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ftinsu:oai:HAL:hal-03199345v1 2024-04-28T08:16:55+00:00 How did Marine Isotope Stage 3 and Last Glacial Maximum climates differ? – Perspectives from equilibrium simulations van Meerbeeck, C. Renssen, H. Roche, Didier M. Vrije Universiteit Amsterdam Amsterdam (VU) Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) Modélisation du climat (CLIM) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) 2009 https://hal.science/hal-03199345 https://hal.science/hal-03199345/document https://hal.science/hal-03199345/file/cp-5-33-2009.pdf https://doi.org/10.5194/cp-5-33-2009 en eng HAL CCSD European Geosciences Union (EGU) info:eu-repo/semantics/altIdentifier/doi/10.5194/cp-5-33-2009 hal-03199345 https://hal.science/hal-03199345 https://hal.science/hal-03199345/document https://hal.science/hal-03199345/file/cp-5-33-2009.pdf doi:10.5194/cp-5-33-2009 info:eu-repo/semantics/OpenAccess ISSN: 1814-9324 EISSN: 1814-9332 Climate of the Past https://hal.science/hal-03199345 Climate of the Past, 2009, 5 (1), pp.33-51. ⟨10.5194/cp-5-33-2009⟩ [SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology info:eu-repo/semantics/article Journal articles 2009 ftinsu https://doi.org/10.5194/cp-5-33-2009 2024-04-05T00:37:31Z International audience Dansgaard-Oeschger events occurred frequently during Marine Isotope Stage 3 (MIS3), as opposed to the following MIS2 period, which included the Last Glacial Maximum (LGM). Transient climate model simulations suggest that these abrupt warming events in Greenland and the North Atlantic region are associated with a resumption of the Thermohaline Circulation (THC) from a weak state during stadials to a relatively strong state during interstadials. However, those models were run with LGM, rather than MIS3 boundary conditions. To quantify the influence of different boundary conditions on the climates of MIS3 and LGM, we perform two equilibrium climate simulations with the threedimensional earth system model LOVECLIM, one for stadial, the other for interstadial conditions. We compare them to the LGM state simulated with the same model. Both climate states are globally 2 • C warmer than LGM. A striking feature of our MIS3 simulations is the enhanced Northern Hemisphere seasonality, July surface air temperatures being 4 • C warmer than in LGM. Also, despite some modification in the location of North Atlantic deep water formation, deep water export to the South Atlantic remains unaffected. To study specifically the effect of orbital forcing, we perform two additional sensitivity experiments spun up from our stadial simulation. The insolation difference between MIS3 and LGM causes half of the 30-60 • N July temperature anomaly (+6 • C). In a third simulation additional freshwater forcing halts the Atlantic THC, yielding a much colder North Atlantic region (−7 • C). Comparing our simulation with proxy data, we find that the MIS3 climate with collapsed THC Article in Journal/Newspaper Dansgaard-Oeschger events Greenland North Atlantic Deep Water North Atlantic Institut national des sciences de l'Univers: HAL-INSU Climate of the Past 5 1 33 51 |
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Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
[SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology |
spellingShingle |
[SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology van Meerbeeck, C. Renssen, H. Roche, Didier M. How did Marine Isotope Stage 3 and Last Glacial Maximum climates differ? – Perspectives from equilibrium simulations |
topic_facet |
[SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology |
description |
International audience Dansgaard-Oeschger events occurred frequently during Marine Isotope Stage 3 (MIS3), as opposed to the following MIS2 period, which included the Last Glacial Maximum (LGM). Transient climate model simulations suggest that these abrupt warming events in Greenland and the North Atlantic region are associated with a resumption of the Thermohaline Circulation (THC) from a weak state during stadials to a relatively strong state during interstadials. However, those models were run with LGM, rather than MIS3 boundary conditions. To quantify the influence of different boundary conditions on the climates of MIS3 and LGM, we perform two equilibrium climate simulations with the threedimensional earth system model LOVECLIM, one for stadial, the other for interstadial conditions. We compare them to the LGM state simulated with the same model. Both climate states are globally 2 • C warmer than LGM. A striking feature of our MIS3 simulations is the enhanced Northern Hemisphere seasonality, July surface air temperatures being 4 • C warmer than in LGM. Also, despite some modification in the location of North Atlantic deep water formation, deep water export to the South Atlantic remains unaffected. To study specifically the effect of orbital forcing, we perform two additional sensitivity experiments spun up from our stadial simulation. The insolation difference between MIS3 and LGM causes half of the 30-60 • N July temperature anomaly (+6 • C). In a third simulation additional freshwater forcing halts the Atlantic THC, yielding a much colder North Atlantic region (−7 • C). Comparing our simulation with proxy data, we find that the MIS3 climate with collapsed THC |
author2 |
Vrije Universiteit Amsterdam Amsterdam (VU) Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA) Modélisation du climat (CLIM) Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Direction de Recherche Fondamentale (CEA) (DRF (CEA)) |
format |
Article in Journal/Newspaper |
author |
van Meerbeeck, C. Renssen, H. Roche, Didier M. |
author_facet |
van Meerbeeck, C. Renssen, H. Roche, Didier M. |
author_sort |
van Meerbeeck, C. |
title |
How did Marine Isotope Stage 3 and Last Glacial Maximum climates differ? – Perspectives from equilibrium simulations |
title_short |
How did Marine Isotope Stage 3 and Last Glacial Maximum climates differ? – Perspectives from equilibrium simulations |
title_full |
How did Marine Isotope Stage 3 and Last Glacial Maximum climates differ? – Perspectives from equilibrium simulations |
title_fullStr |
How did Marine Isotope Stage 3 and Last Glacial Maximum climates differ? – Perspectives from equilibrium simulations |
title_full_unstemmed |
How did Marine Isotope Stage 3 and Last Glacial Maximum climates differ? – Perspectives from equilibrium simulations |
title_sort |
how did marine isotope stage 3 and last glacial maximum climates differ? – perspectives from equilibrium simulations |
publisher |
HAL CCSD |
publishDate |
2009 |
url |
https://hal.science/hal-03199345 https://hal.science/hal-03199345/document https://hal.science/hal-03199345/file/cp-5-33-2009.pdf https://doi.org/10.5194/cp-5-33-2009 |
genre |
Dansgaard-Oeschger events Greenland North Atlantic Deep Water North Atlantic |
genre_facet |
Dansgaard-Oeschger events Greenland North Atlantic Deep Water North Atlantic |
op_source |
ISSN: 1814-9324 EISSN: 1814-9332 Climate of the Past https://hal.science/hal-03199345 Climate of the Past, 2009, 5 (1), pp.33-51. ⟨10.5194/cp-5-33-2009⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.5194/cp-5-33-2009 hal-03199345 https://hal.science/hal-03199345 https://hal.science/hal-03199345/document https://hal.science/hal-03199345/file/cp-5-33-2009.pdf doi:10.5194/cp-5-33-2009 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.5194/cp-5-33-2009 |
container_title |
Climate of the Past |
container_volume |
5 |
container_issue |
1 |
container_start_page |
33 |
op_container_end_page |
51 |
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