Reconstructing the last interglacial at Summit, Greenland: Insights from GISP2

The Eemian (last interglacial, 130-115 ka) was likely the warmest of all interglacials of the last 800 ka, with summer Arctic temperatures 3-5 degrees C above present. Here, we present improved Eemian climate records from central Greenland, reconstructed from the base of the Greenland Ice Sheet Proj...

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Detalles Bibliográficos
Autores: Yau, Audrey M., Bender, Michael L., Robinson, Alexander James, Brook, Edward J.
Tipo de recurso: artículo
Fecha de publicación:2016
País:España
Institución:Universidad Complutense de Madrid (UCM)
Repositorio:Docta Complutense
Idioma:inglés
OAI Identifier:oai:docta.ucm.es:20.500.14352/17551
Acceso en línea:https://hdl.handle.net/20.500.14352/17551
Access Level:acceso abierto
Palabra clave:52
Sea-level rise
Ice-sheet contribution
Air content
Climatic parameters
Local insolation
Isotope records
Oxygen-isotope
Antarctic ice
Core project
Polar ice
Astrofísica
Astronomía (Física)
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spelling Reconstructing the last interglacial at Summit, Greenland: Insights from GISP2Yau, Audrey M.Bender, Michael L.Robinson, Alexander JamesBrook, Edward J.52Sea-level riseIce-sheet contributionAir contentClimatic parametersLocal insolationIsotope recordsOxygen-isotopeAntarctic iceCore projectPolar iceAstrofísicaAstronomía (Física)The Eemian (last interglacial, 130-115 ka) was likely the warmest of all interglacials of the last 800 ka, with summer Arctic temperatures 3-5 degrees C above present. Here, we present improved Eemian climate records from central Greenland, reconstructed from the base of the Greenland Ice Sheet Project 2 (GISP2) ice core. Our record comes from clean, stratigraphically disturbed, and isotopically warm ice from 2,750 to 3,040 m depth. The age of this ice is constrained by measuring CH_4 and delta O^18 of O_2, and comparing with the historical record of these properties from the North Greenland Ice Core Project (NGRIP) and North Greenland Eemian Ice Drilling (NEEM) ice cores. The d^18 O_ice, d^15N of N_2, and total air content for samples dating discontinuously from 128 to 115 ka indicate a warming of similar to 6 degrees C between 127-121 ka, and a similar elevation history between GISP2 and NEEM. The reconstructed climate and elevation histories are compared with an ensemble of coupled climate-ice-sheet model simulations of the Greenland ice sheet. Those most consistent with the reconstructed temperatures indicate that the Greenland ice sheet contributed 5.1 m (4.1-6.2 m, 95% credible interval) to global eustatic sea level toward the end of the Eemian. Greenland likely did not contribute to anomalously high sea levels at ~127 ka, or to a rapid jump in sea level at ~120 ka. However, several unexplained discrepancies remain between the inferred and simulated histories of temperature and accumulation rate at GISP2 and NEEM, as well as between the climatic reconstructions themselves.National Academy of SciencesUniversidad Complutense de Madrid20162016-08-3020162016-08-30journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/17551reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/175512026-06-02T12:44:21Z
dc.title.none.fl_str_mv Reconstructing the last interglacial at Summit, Greenland: Insights from GISP2
title Reconstructing the last interglacial at Summit, Greenland: Insights from GISP2
spellingShingle Reconstructing the last interglacial at Summit, Greenland: Insights from GISP2
Yau, Audrey M.
52
Sea-level rise
Ice-sheet contribution
Air content
Climatic parameters
Local insolation
Isotope records
Oxygen-isotope
Antarctic ice
Core project
Polar ice
Astrofísica
Astronomía (Física)
title_short Reconstructing the last interglacial at Summit, Greenland: Insights from GISP2
title_full Reconstructing the last interglacial at Summit, Greenland: Insights from GISP2
title_fullStr Reconstructing the last interglacial at Summit, Greenland: Insights from GISP2
title_full_unstemmed Reconstructing the last interglacial at Summit, Greenland: Insights from GISP2
title_sort Reconstructing the last interglacial at Summit, Greenland: Insights from GISP2
dc.creator.none.fl_str_mv Yau, Audrey M.
Bender, Michael L.
Robinson, Alexander James
Brook, Edward J.
author Yau, Audrey M.
author_facet Yau, Audrey M.
Bender, Michael L.
Robinson, Alexander James
Brook, Edward J.
author_role author
author2 Bender, Michael L.
Robinson, Alexander James
Brook, Edward J.
author2_role author
author
author
dc.contributor.none.fl_str_mv Universidad Complutense de Madrid
dc.subject.none.fl_str_mv 52
Sea-level rise
Ice-sheet contribution
Air content
Climatic parameters
Local insolation
Isotope records
Oxygen-isotope
Antarctic ice
Core project
Polar ice
Astrofísica
Astronomía (Física)
topic 52
Sea-level rise
Ice-sheet contribution
Air content
Climatic parameters
Local insolation
Isotope records
Oxygen-isotope
Antarctic ice
Core project
Polar ice
Astrofísica
Astronomía (Física)
description The Eemian (last interglacial, 130-115 ka) was likely the warmest of all interglacials of the last 800 ka, with summer Arctic temperatures 3-5 degrees C above present. Here, we present improved Eemian climate records from central Greenland, reconstructed from the base of the Greenland Ice Sheet Project 2 (GISP2) ice core. Our record comes from clean, stratigraphically disturbed, and isotopically warm ice from 2,750 to 3,040 m depth. The age of this ice is constrained by measuring CH_4 and delta O^18 of O_2, and comparing with the historical record of these properties from the North Greenland Ice Core Project (NGRIP) and North Greenland Eemian Ice Drilling (NEEM) ice cores. The d^18 O_ice, d^15N of N_2, and total air content for samples dating discontinuously from 128 to 115 ka indicate a warming of similar to 6 degrees C between 127-121 ka, and a similar elevation history between GISP2 and NEEM. The reconstructed climate and elevation histories are compared with an ensemble of coupled climate-ice-sheet model simulations of the Greenland ice sheet. Those most consistent with the reconstructed temperatures indicate that the Greenland ice sheet contributed 5.1 m (4.1-6.2 m, 95% credible interval) to global eustatic sea level toward the end of the Eemian. Greenland likely did not contribute to anomalously high sea levels at ~127 ka, or to a rapid jump in sea level at ~120 ka. However, several unexplained discrepancies remain between the inferred and simulated histories of temperature and accumulation rate at GISP2 and NEEM, as well as between the climatic reconstructions themselves.
publishDate 2016
dc.date.none.fl_str_mv 2016
2016-08-30
2016
2016-08-30
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/20.500.14352/17551
url https://hdl.handle.net/20.500.14352/17551
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv National Academy of Sciences
publisher.none.fl_str_mv National Academy of Sciences
dc.source.none.fl_str_mv reponame:Docta Complutense
instname:Universidad Complutense de Madrid (UCM)
instname_str Universidad Complutense de Madrid (UCM)
reponame_str Docta Complutense
collection Docta Complutense
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,300724

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