Oxygen stable isotopes during the Last Glacial Maximum climate: perspectives from data–model (iLOVECLIM) comparison
We use the fully coupled atmosphere–ocean three-dimensional model of intermediate complexity iLOVECLIM to simulate the climate and oxygen stable isotopic signal during the Last Glacial Maximum (LGM, 21 000 years). By using a model that is able to explicitly simulate the sensor (δ18O), results can be...
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Language: | English |
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Copernicus Publications
2014
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Online Access: | https://doi.org/10.5194/cp-10-1939-2014 http://www.clim-past.net/10/1939/2014/cp-10-1939-2014.pdf https://doaj.org/article/3f9b546906274011a3303bf4789775db |
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fttriple:oai:gotriple.eu:oai:doaj.org/article:3f9b546906274011a3303bf4789775db 2023-05-15T16:28:39+02:00 Oxygen stable isotopes during the Last Glacial Maximum climate: perspectives from data–model (iLOVECLIM) comparison T. Caley D. M. Roche C. Waelbroeck E. Michel 2014-11-01 https://doi.org/10.5194/cp-10-1939-2014 http://www.clim-past.net/10/1939/2014/cp-10-1939-2014.pdf https://doaj.org/article/3f9b546906274011a3303bf4789775db en eng Copernicus Publications 1814-9324 1814-9332 doi:10.5194/cp-10-1939-2014 http://www.clim-past.net/10/1939/2014/cp-10-1939-2014.pdf https://doaj.org/article/3f9b546906274011a3303bf4789775db undefined Climate of the Past, Vol 10, Iss 6, Pp 1939-1955 (2014) geo envir Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2014 fttriple https://doi.org/10.5194/cp-10-1939-2014 2023-01-22T19:15:39Z We use the fully coupled atmosphere–ocean three-dimensional model of intermediate complexity iLOVECLIM to simulate the climate and oxygen stable isotopic signal during the Last Glacial Maximum (LGM, 21 000 years). By using a model that is able to explicitly simulate the sensor (δ18O), results can be directly compared with data from climatic archives in the different realms. Our results indicate that iLOVECLIM reproduces well the main feature of the LGM climate in the atmospheric and oceanic components. The annual mean δ18O in precipitation shows more depleted values in the northern and southern high latitudes during the LGM. The model reproduces very well the spatial gradient observed in ice core records over the Greenland ice sheet. We observe a general pattern toward more enriched values for continental calcite δ18O in the model at the LGM, in agreement with speleothem data. This can be explained by both a general atmospheric cooling in the tropical and subtropical regions and a reduction in precipitation as confirmed by reconstruction derived from pollens and plant macrofossils. Data–model comparison for sea surface temperature indicates that iLOVECLIM is capable to satisfyingly simulate the change in oceanic surface conditions between the LGM and present. Our data–model comparison for calcite δ18O allows investigating the large discrepancies with respect to glacial temperatures recorded by different microfossil proxies in the North Atlantic region. The results argue for a strong mean annual cooling in the area south of Iceland and Greenland between the LGM and present (> 6 °C), supporting the foraminifera transfer function reconstruction but in disagreement with alkenones and dinocyst reconstructions. The data–model comparison also reveals that large positive calcite δ18O anomaly in the Southern Ocean may be explained by an important cooling, although the driver of this pattern is unclear. We deduce a large positive δ18Osw anomaly for the north Indian Ocean that contrasts with a large negative δ18Osw ... Article in Journal/Newspaper Greenland ice core Ice Sheet Iceland North Atlantic Southern Ocean Unknown Greenland Indian Southern Ocean Climate of the Past 10 6 1939 1955 |
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geo envir T. Caley D. M. Roche C. Waelbroeck E. Michel Oxygen stable isotopes during the Last Glacial Maximum climate: perspectives from data–model (iLOVECLIM) comparison |
topic_facet |
geo envir |
description |
We use the fully coupled atmosphere–ocean three-dimensional model of intermediate complexity iLOVECLIM to simulate the climate and oxygen stable isotopic signal during the Last Glacial Maximum (LGM, 21 000 years). By using a model that is able to explicitly simulate the sensor (δ18O), results can be directly compared with data from climatic archives in the different realms. Our results indicate that iLOVECLIM reproduces well the main feature of the LGM climate in the atmospheric and oceanic components. The annual mean δ18O in precipitation shows more depleted values in the northern and southern high latitudes during the LGM. The model reproduces very well the spatial gradient observed in ice core records over the Greenland ice sheet. We observe a general pattern toward more enriched values for continental calcite δ18O in the model at the LGM, in agreement with speleothem data. This can be explained by both a general atmospheric cooling in the tropical and subtropical regions and a reduction in precipitation as confirmed by reconstruction derived from pollens and plant macrofossils. Data–model comparison for sea surface temperature indicates that iLOVECLIM is capable to satisfyingly simulate the change in oceanic surface conditions between the LGM and present. Our data–model comparison for calcite δ18O allows investigating the large discrepancies with respect to glacial temperatures recorded by different microfossil proxies in the North Atlantic region. The results argue for a strong mean annual cooling in the area south of Iceland and Greenland between the LGM and present (> 6 °C), supporting the foraminifera transfer function reconstruction but in disagreement with alkenones and dinocyst reconstructions. The data–model comparison also reveals that large positive calcite δ18O anomaly in the Southern Ocean may be explained by an important cooling, although the driver of this pattern is unclear. We deduce a large positive δ18Osw anomaly for the north Indian Ocean that contrasts with a large negative δ18Osw ... |
format |
Article in Journal/Newspaper |
author |
T. Caley D. M. Roche C. Waelbroeck E. Michel |
author_facet |
T. Caley D. M. Roche C. Waelbroeck E. Michel |
author_sort |
T. Caley |
title |
Oxygen stable isotopes during the Last Glacial Maximum climate: perspectives from data–model (iLOVECLIM) comparison |
title_short |
Oxygen stable isotopes during the Last Glacial Maximum climate: perspectives from data–model (iLOVECLIM) comparison |
title_full |
Oxygen stable isotopes during the Last Glacial Maximum climate: perspectives from data–model (iLOVECLIM) comparison |
title_fullStr |
Oxygen stable isotopes during the Last Glacial Maximum climate: perspectives from data–model (iLOVECLIM) comparison |
title_full_unstemmed |
Oxygen stable isotopes during the Last Glacial Maximum climate: perspectives from data–model (iLOVECLIM) comparison |
title_sort |
oxygen stable isotopes during the last glacial maximum climate: perspectives from data–model (iloveclim) comparison |
publisher |
Copernicus Publications |
publishDate |
2014 |
url |
https://doi.org/10.5194/cp-10-1939-2014 http://www.clim-past.net/10/1939/2014/cp-10-1939-2014.pdf https://doaj.org/article/3f9b546906274011a3303bf4789775db |
geographic |
Greenland Indian Southern Ocean |
geographic_facet |
Greenland Indian Southern Ocean |
genre |
Greenland ice core Ice Sheet Iceland North Atlantic Southern Ocean |
genre_facet |
Greenland ice core Ice Sheet Iceland North Atlantic Southern Ocean |
op_source |
Climate of the Past, Vol 10, Iss 6, Pp 1939-1955 (2014) |
op_relation |
1814-9324 1814-9332 doi:10.5194/cp-10-1939-2014 http://www.clim-past.net/10/1939/2014/cp-10-1939-2014.pdf https://doaj.org/article/3f9b546906274011a3303bf4789775db |
op_rights |
undefined |
op_doi |
https://doi.org/10.5194/cp-10-1939-2014 |
container_title |
Climate of the Past |
container_volume |
10 |
container_issue |
6 |
container_start_page |
1939 |
op_container_end_page |
1955 |
_version_ |
1766018332908060672 |