Significant contribution of insolation to Eemian melting of the Greenland ice sheet
During the Eemian interglacial period, 130,000 to 114,000 years ago, the volume of the Greenland ice sheet was about 30–60% smaller than the present-day volume1,2. Summer temperatures in the Arctic region were about 2–4 K higher than today3–5, leading to the suggestion that Eemian conditions could b...
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ftunivutrecht:oai:dspace.library.uu.nl:1874/231612 2023-07-23T04:17:54+02:00 Significant contribution of insolation to Eemian melting of the Greenland ice sheet van de Berg, W.J. van den Broeke, M.R. Ettema, J. van Meijgaard, E. Kaspar, F. Marine and Atmospheric Research Dep Natuurkunde Sub Dynamics Meteorology 2011 text/plain https://dspace.library.uu.nl/handle/1874/231612 en eng 1752-0894 https://dspace.library.uu.nl/handle/1874/231612 info:eu-repo/semantics/EmbargoedAccess Article 2011 ftunivutrecht 2023-07-02T00:05:18Z During the Eemian interglacial period, 130,000 to 114,000 years ago, the volume of the Greenland ice sheet was about 30–60% smaller than the present-day volume1,2. Summer temperatures in the Arctic region were about 2–4 K higher than today3–5, leading to the suggestion that Eemian conditions could be considered an analogue for future warming6, particularly for the future stability of the Greenland ice sheet. However, Northern Hemisphere insolation was much higher during the Eemian than today, which could affect the reliability of this analogy. Here we use a high-resolution regional climate model with a realistic ice-sheet surface representation to assess the surface mass balance of the Greenland ice sheet during the Eemian. Our simulations show that Eemian climate led to an 83% lower surface mass balance, compared with the preindustrial simulation. Our sensitivity experiments show that only about 55% of this change in surface mass balance can be attributed to higher ambient temperatures, with the remaining 45% caused by higher insolation and associated nonlinear feedbacks.We show that temperature–melt relations are dependent on changes in insolation. Hence, we suggest that projections of future Greenland ice loss on the basis of Eemian temperature–melt relations may overestimate the future vulnerability of the ice sheet. Article in Journal/Newspaper Arctic Greenland Ice Sheet Utrecht University Repository Arctic Greenland |
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Open Polar |
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Utrecht University Repository |
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ftunivutrecht |
language |
English |
description |
During the Eemian interglacial period, 130,000 to 114,000 years ago, the volume of the Greenland ice sheet was about 30–60% smaller than the present-day volume1,2. Summer temperatures in the Arctic region were about 2–4 K higher than today3–5, leading to the suggestion that Eemian conditions could be considered an analogue for future warming6, particularly for the future stability of the Greenland ice sheet. However, Northern Hemisphere insolation was much higher during the Eemian than today, which could affect the reliability of this analogy. Here we use a high-resolution regional climate model with a realistic ice-sheet surface representation to assess the surface mass balance of the Greenland ice sheet during the Eemian. Our simulations show that Eemian climate led to an 83% lower surface mass balance, compared with the preindustrial simulation. Our sensitivity experiments show that only about 55% of this change in surface mass balance can be attributed to higher ambient temperatures, with the remaining 45% caused by higher insolation and associated nonlinear feedbacks.We show that temperature–melt relations are dependent on changes in insolation. Hence, we suggest that projections of future Greenland ice loss on the basis of Eemian temperature–melt relations may overestimate the future vulnerability of the ice sheet. |
author2 |
Marine and Atmospheric Research Dep Natuurkunde Sub Dynamics Meteorology |
format |
Article in Journal/Newspaper |
author |
van de Berg, W.J. van den Broeke, M.R. Ettema, J. van Meijgaard, E. Kaspar, F. |
spellingShingle |
van de Berg, W.J. van den Broeke, M.R. Ettema, J. van Meijgaard, E. Kaspar, F. Significant contribution of insolation to Eemian melting of the Greenland ice sheet |
author_facet |
van de Berg, W.J. van den Broeke, M.R. Ettema, J. van Meijgaard, E. Kaspar, F. |
author_sort |
van de Berg, W.J. |
title |
Significant contribution of insolation to Eemian melting of the Greenland ice sheet |
title_short |
Significant contribution of insolation to Eemian melting of the Greenland ice sheet |
title_full |
Significant contribution of insolation to Eemian melting of the Greenland ice sheet |
title_fullStr |
Significant contribution of insolation to Eemian melting of the Greenland ice sheet |
title_full_unstemmed |
Significant contribution of insolation to Eemian melting of the Greenland ice sheet |
title_sort |
significant contribution of insolation to eemian melting of the greenland ice sheet |
publishDate |
2011 |
url |
https://dspace.library.uu.nl/handle/1874/231612 |
geographic |
Arctic Greenland |
geographic_facet |
Arctic Greenland |
genre |
Arctic Greenland Ice Sheet |
genre_facet |
Arctic Greenland Ice Sheet |
op_relation |
1752-0894 https://dspace.library.uu.nl/handle/1874/231612 |
op_rights |
info:eu-repo/semantics/EmbargoedAccess |
_version_ |
1772179997658710016 |