Summer warmth of the past six interglacials on Greenland
The relative warmth of mid-to-late Pleistocene interglacials on Greenland has remained unknown, leading to debates about the regional climate forcing that caused past retreat of the Greenland Ice Sheet (GrIS). We analyze the hydrogen isotopic composition of terrestrial biomarkers in Labrador Sea sed...
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ftpubmed:oai:pubmedcentral.nih.gov:8157949 2023-05-15T16:24:26+02:00 Summer warmth of the past six interglacials on Greenland Cluett, Allison A. Thomas, Elizabeth K. 2021-05-18 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8157949/ http://www.ncbi.nlm.nih.gov/pubmed/33972430 https://doi.org/10.1073/pnas.2022916118 en eng National Academy of Sciences http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8157949/ http://www.ncbi.nlm.nih.gov/pubmed/33972430 http://dx.doi.org/10.1073/pnas.2022916118 https://www.pnas.org/site/aboutpnas/licenses.xhtmlPublished under the PNAS license (https://www.pnas.org/site/aboutpnas/licenses.xhtml) . Proc Natl Acad Sci U S A Physical Sciences Text 2021 ftpubmed https://doi.org/10.1073/pnas.2022916118 2021-11-14T01:25:50Z The relative warmth of mid-to-late Pleistocene interglacials on Greenland has remained unknown, leading to debates about the regional climate forcing that caused past retreat of the Greenland Ice Sheet (GrIS). We analyze the hydrogen isotopic composition of terrestrial biomarkers in Labrador Sea sediments through interglacials of the past 600,000 y to infer millennial-scale summer warmth on southern Greenland. Here, we reconstruct exceptionally warm summers in Marine Isotope Stage (MIS) 5e, concurrent with strong Northern Hemisphere summer insolation. In contrast, “superinterglacial” MIS11 demonstrated only moderate warmth, sustained throughout a prolonged interval of elevated atmospheric carbon dioxide. Strong inferred GrIS retreat during MIS11 relative to MIS5e suggests an indirect relationship between maximum summer temperature and cumulative interglacial mass loss, indicating strong GrIS sensitivity to duration of regional warmth and elevated atmospheric carbon dioxide. Text Greenland Ice Sheet Labrador Sea PubMed Central (PMC) Greenland Proceedings of the National Academy of Sciences 118 20 |
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Physical Sciences |
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Physical Sciences Cluett, Allison A. Thomas, Elizabeth K. Summer warmth of the past six interglacials on Greenland |
topic_facet |
Physical Sciences |
description |
The relative warmth of mid-to-late Pleistocene interglacials on Greenland has remained unknown, leading to debates about the regional climate forcing that caused past retreat of the Greenland Ice Sheet (GrIS). We analyze the hydrogen isotopic composition of terrestrial biomarkers in Labrador Sea sediments through interglacials of the past 600,000 y to infer millennial-scale summer warmth on southern Greenland. Here, we reconstruct exceptionally warm summers in Marine Isotope Stage (MIS) 5e, concurrent with strong Northern Hemisphere summer insolation. In contrast, “superinterglacial” MIS11 demonstrated only moderate warmth, sustained throughout a prolonged interval of elevated atmospheric carbon dioxide. Strong inferred GrIS retreat during MIS11 relative to MIS5e suggests an indirect relationship between maximum summer temperature and cumulative interglacial mass loss, indicating strong GrIS sensitivity to duration of regional warmth and elevated atmospheric carbon dioxide. |
format |
Text |
author |
Cluett, Allison A. Thomas, Elizabeth K. |
author_facet |
Cluett, Allison A. Thomas, Elizabeth K. |
author_sort |
Cluett, Allison A. |
title |
Summer warmth of the past six interglacials on Greenland |
title_short |
Summer warmth of the past six interglacials on Greenland |
title_full |
Summer warmth of the past six interglacials on Greenland |
title_fullStr |
Summer warmth of the past six interglacials on Greenland |
title_full_unstemmed |
Summer warmth of the past six interglacials on Greenland |
title_sort |
summer warmth of the past six interglacials on greenland |
publisher |
National Academy of Sciences |
publishDate |
2021 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8157949/ http://www.ncbi.nlm.nih.gov/pubmed/33972430 https://doi.org/10.1073/pnas.2022916118 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet Labrador Sea |
genre_facet |
Greenland Ice Sheet Labrador Sea |
op_source |
Proc Natl Acad Sci U S A |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8157949/ http://www.ncbi.nlm.nih.gov/pubmed/33972430 http://dx.doi.org/10.1073/pnas.2022916118 |
op_rights |
https://www.pnas.org/site/aboutpnas/licenses.xhtmlPublished under the PNAS license (https://www.pnas.org/site/aboutpnas/licenses.xhtml) . |
op_doi |
https://doi.org/10.1073/pnas.2022916118 |
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Proceedings of the National Academy of Sciences |
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118 |
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20 |
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1766012886900015104 |