Interaction of ice sheets and climate during the past 800 000 years
During the Cenozoic, land ice and climate interacted on many different timescales. On long timescales, the effect of land ice on global climate and sea level is mainly set by large ice sheets in North America, Eurasia, Greenland and Antarctica. The climatic forcing of these ice sheets is largely det...
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ftunivutrecht:oai:dspace.library.uu.nl:1874/305053 2023-07-23T04:15:47+02:00 Interaction of ice sheets and climate during the past 800 000 years Stap, L. B. Van De Wal, R. S W De Boer, B. Bintanja, R. Lourens, L. J. Sub Dynamics Meteorology Institute for Marine and Atmospheric Research Stratigraphy and paleontology Marine and Atmospheric Research Stratigraphy & paleontology 2014-12-04 image/pdf https://dspace.library.uu.nl/handle/1874/305053 en eng 1814-9324 https://dspace.library.uu.nl/handle/1874/305053 info:eu-repo/semantics/OpenAccess Palaeontology Stratigraphy Global and Planetary Change Article 2014 ftunivutrecht 2023-07-02T01:09:19Z During the Cenozoic, land ice and climate interacted on many different timescales. On long timescales, the effect of land ice on global climate and sea level is mainly set by large ice sheets in North America, Eurasia, Greenland and Antarctica. The climatic forcing of these ice sheets is largely determined by the meridional temperature profile resulting from radiation and greenhouse gas (GHG) forcing. As a response, the ice sheets cause an increase in albedo and surface elevation, which operates as a feedback in the climate system. To quantify the importance of these climate-land ice processes, a zonally averaged energy balance climate model is coupled to five one-dimensional ice sheet models, representing the major ice sheets. In this study, we focus on the transient simulation of the past 800 000 years, where a high-confidence CO2 record from ice core samples is used as input in combination with Milankovitch radiation changes. We obtain simulations of atmospheric temperature, ice volume and sea level that are in good agreement with recent proxy-data reconstructions. We examine long-term climate-ice-sheet interactions by a comparison of simulations with uncoupled and coupled ice sheets. We show that these interactions amplify global temperature anomalies by up to a factor of 2.6, and that they increase polar amplification by 94 %. We demonstrate that, on these long timescales, the ice-albedo feedback has a larger and more global influence on the meridional atmospheric temperature profile than the surface-height-temperature feedback. Furthermore, we assess the influence of CO2 and insolation by performing runs with one or both of these variables held constant. We find that atmospheric temperature is controlled by a complex interaction of CO2 and insolation, and both variables serve as thresholds for northern hemispheric glaciation. Article in Journal/Newspaper Antarc* Antarctica Greenland ice core Ice Sheet Utrecht University Repository Greenland |
institution |
Open Polar |
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Utrecht University Repository |
op_collection_id |
ftunivutrecht |
language |
English |
topic |
Palaeontology Stratigraphy Global and Planetary Change |
spellingShingle |
Palaeontology Stratigraphy Global and Planetary Change Stap, L. B. Van De Wal, R. S W De Boer, B. Bintanja, R. Lourens, L. J. Interaction of ice sheets and climate during the past 800 000 years |
topic_facet |
Palaeontology Stratigraphy Global and Planetary Change |
description |
During the Cenozoic, land ice and climate interacted on many different timescales. On long timescales, the effect of land ice on global climate and sea level is mainly set by large ice sheets in North America, Eurasia, Greenland and Antarctica. The climatic forcing of these ice sheets is largely determined by the meridional temperature profile resulting from radiation and greenhouse gas (GHG) forcing. As a response, the ice sheets cause an increase in albedo and surface elevation, which operates as a feedback in the climate system. To quantify the importance of these climate-land ice processes, a zonally averaged energy balance climate model is coupled to five one-dimensional ice sheet models, representing the major ice sheets. In this study, we focus on the transient simulation of the past 800 000 years, where a high-confidence CO2 record from ice core samples is used as input in combination with Milankovitch radiation changes. We obtain simulations of atmospheric temperature, ice volume and sea level that are in good agreement with recent proxy-data reconstructions. We examine long-term climate-ice-sheet interactions by a comparison of simulations with uncoupled and coupled ice sheets. We show that these interactions amplify global temperature anomalies by up to a factor of 2.6, and that they increase polar amplification by 94 %. We demonstrate that, on these long timescales, the ice-albedo feedback has a larger and more global influence on the meridional atmospheric temperature profile than the surface-height-temperature feedback. Furthermore, we assess the influence of CO2 and insolation by performing runs with one or both of these variables held constant. We find that atmospheric temperature is controlled by a complex interaction of CO2 and insolation, and both variables serve as thresholds for northern hemispheric glaciation. |
author2 |
Sub Dynamics Meteorology Institute for Marine and Atmospheric Research Stratigraphy and paleontology Marine and Atmospheric Research Stratigraphy & paleontology |
format |
Article in Journal/Newspaper |
author |
Stap, L. B. Van De Wal, R. S W De Boer, B. Bintanja, R. Lourens, L. J. |
author_facet |
Stap, L. B. Van De Wal, R. S W De Boer, B. Bintanja, R. Lourens, L. J. |
author_sort |
Stap, L. B. |
title |
Interaction of ice sheets and climate during the past 800 000 years |
title_short |
Interaction of ice sheets and climate during the past 800 000 years |
title_full |
Interaction of ice sheets and climate during the past 800 000 years |
title_fullStr |
Interaction of ice sheets and climate during the past 800 000 years |
title_full_unstemmed |
Interaction of ice sheets and climate during the past 800 000 years |
title_sort |
interaction of ice sheets and climate during the past 800 000 years |
publishDate |
2014 |
url |
https://dspace.library.uu.nl/handle/1874/305053 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Antarc* Antarctica Greenland ice core Ice Sheet |
genre_facet |
Antarc* Antarctica Greenland ice core Ice Sheet |
op_relation |
1814-9324 https://dspace.library.uu.nl/handle/1874/305053 |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1772176796012249088 |