How warm was Greenland during the last interglacial period?
The last interglacial period (LIG, ∼ 129–116 thousand years ago) provides the most recent case study of multimillennial polar warming above the preindustrial level and a response of the Greenland and Antarctic ice sheets to this warming, as well as a test bed for climate and ice sheet models. Past c...
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ftdatacite:10.7892/boris.89100 2023-05-15T14:01:53+02:00 How warm was Greenland during the last interglacial period? Stone, Emma J. Dahl-Jensen, Dorthe Vinther, Bo Fischer, Hubertus Masson-Delmotte, Valérie Langebroek, Petra M. Capron, Emilie Landais, Amaelle Prié, Frédéric Orsi, Anaïs Merz, Niklaus Bakker, Pepijn Raible, Christoph 2016 application/pdf https://dx.doi.org/10.7892/boris.89100 http://boris.unibe.ch/89100/ en eng Copernicus Publications info:eu-repo/semantics/openAccess 550 Earth sciences & geology 530 Physics Text article-journal ScholarlyArticle 2016 ftdatacite https://doi.org/10.7892/boris.89100 2021-11-05T12:55:41Z The last interglacial period (LIG, ∼ 129–116 thousand years ago) provides the most recent case study of multimillennial polar warming above the preindustrial level and a response of the Greenland and Antarctic ice sheets to this warming, as well as a test bed for climate and ice sheet models. Past changes in Greenland ice sheet thickness and surface temperature during this period were recently derived from the North Greenland Eemian Ice Drilling (NEEM) ice core records, northwest Greenland. The NEEM paradox has emerged from an estimated large local warming above the preindustrial level (7.5 ± 1.8 °C at the deposition site 126 kyr ago without correction for any overall ice sheet altitude changes between the LIG and the preindustrial period) based on water isotopes, together with limited local ice thinning, suggesting more resilience of the real Greenland ice sheet than shown in some ice sheet models. Here, we provide an independent assessment of the average LIG Greenland surface warming using ice core air isotopic composition (δ15N) and relationships between accumulation rate and temperature. The LIG surface temperature at the upstream NEEM deposition site without ice sheet altitude correction is estimated to be warmer by +8.5 ± 2.5 °C compared to the preindustrial period. This temperature estimate is consistent with the 7.5 ± 1.8 °C warming initially determined from NEEM water isotopes but at the upper end of the preindustrial period to LIG temperature difference of +5.2 ± 2.3 °C obtained at the NGRIP (North Greenland Ice Core Project) site by the same method. Climate simulations performed with present-day ice sheet topography lead in general to a warming smaller than reconstructed, but sensitivity tests show that larger amplitudes (up to 5 °C) are produced in response to prescribed changes in sea ice extent and ice sheet topography. Text Antarc* Antarctic Greenland Greenland ice core Greenland Ice core Project ice core Ice Sheet NGRIP North Greenland North Greenland Ice Core Project Sea ice DataCite Metadata Store (German National Library of Science and Technology) Antarctic Greenland |
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Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
topic |
550 Earth sciences & geology 530 Physics |
spellingShingle |
550 Earth sciences & geology 530 Physics Stone, Emma J. Dahl-Jensen, Dorthe Vinther, Bo Fischer, Hubertus Masson-Delmotte, Valérie Langebroek, Petra M. Capron, Emilie Landais, Amaelle Prié, Frédéric Orsi, Anaïs Merz, Niklaus Bakker, Pepijn Raible, Christoph How warm was Greenland during the last interglacial period? |
topic_facet |
550 Earth sciences & geology 530 Physics |
description |
The last interglacial period (LIG, ∼ 129–116 thousand years ago) provides the most recent case study of multimillennial polar warming above the preindustrial level and a response of the Greenland and Antarctic ice sheets to this warming, as well as a test bed for climate and ice sheet models. Past changes in Greenland ice sheet thickness and surface temperature during this period were recently derived from the North Greenland Eemian Ice Drilling (NEEM) ice core records, northwest Greenland. The NEEM paradox has emerged from an estimated large local warming above the preindustrial level (7.5 ± 1.8 °C at the deposition site 126 kyr ago without correction for any overall ice sheet altitude changes between the LIG and the preindustrial period) based on water isotopes, together with limited local ice thinning, suggesting more resilience of the real Greenland ice sheet than shown in some ice sheet models. Here, we provide an independent assessment of the average LIG Greenland surface warming using ice core air isotopic composition (δ15N) and relationships between accumulation rate and temperature. The LIG surface temperature at the upstream NEEM deposition site without ice sheet altitude correction is estimated to be warmer by +8.5 ± 2.5 °C compared to the preindustrial period. This temperature estimate is consistent with the 7.5 ± 1.8 °C warming initially determined from NEEM water isotopes but at the upper end of the preindustrial period to LIG temperature difference of +5.2 ± 2.3 °C obtained at the NGRIP (North Greenland Ice Core Project) site by the same method. Climate simulations performed with present-day ice sheet topography lead in general to a warming smaller than reconstructed, but sensitivity tests show that larger amplitudes (up to 5 °C) are produced in response to prescribed changes in sea ice extent and ice sheet topography. |
format |
Text |
author |
Stone, Emma J. Dahl-Jensen, Dorthe Vinther, Bo Fischer, Hubertus Masson-Delmotte, Valérie Langebroek, Petra M. Capron, Emilie Landais, Amaelle Prié, Frédéric Orsi, Anaïs Merz, Niklaus Bakker, Pepijn Raible, Christoph |
author_facet |
Stone, Emma J. Dahl-Jensen, Dorthe Vinther, Bo Fischer, Hubertus Masson-Delmotte, Valérie Langebroek, Petra M. Capron, Emilie Landais, Amaelle Prié, Frédéric Orsi, Anaïs Merz, Niklaus Bakker, Pepijn Raible, Christoph |
author_sort |
Stone, Emma J. |
title |
How warm was Greenland during the last interglacial period? |
title_short |
How warm was Greenland during the last interglacial period? |
title_full |
How warm was Greenland during the last interglacial period? |
title_fullStr |
How warm was Greenland during the last interglacial period? |
title_full_unstemmed |
How warm was Greenland during the last interglacial period? |
title_sort |
how warm was greenland during the last interglacial period? |
publisher |
Copernicus Publications |
publishDate |
2016 |
url |
https://dx.doi.org/10.7892/boris.89100 http://boris.unibe.ch/89100/ |
geographic |
Antarctic Greenland |
geographic_facet |
Antarctic Greenland |
genre |
Antarc* Antarctic Greenland Greenland ice core Greenland Ice core Project ice core Ice Sheet NGRIP North Greenland North Greenland Ice Core Project Sea ice |
genre_facet |
Antarc* Antarctic Greenland Greenland ice core Greenland Ice core Project ice core Ice Sheet NGRIP North Greenland North Greenland Ice Core Project Sea ice |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.7892/boris.89100 |
_version_ |
1766271938722791424 |