Glacial inception through rapid ice area increase driven by albedo and vegetation feedbacks
We present transient simulations of the last glacial inception using the Earth system model CLIMBER-X with dynamic vegetation, interactive ice sheets, and visco-elastic solid Earth responses. The simulations are initialized at the middle of the Eemian interglacial (125 kiloyears before present, ka)...
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ftunivutrecht:oai:dspace.library.uu.nl:1874/437665 2024-05-12T08:05:14+00:00 Glacial inception through rapid ice area increase driven by albedo and vegetation feedbacks Willeit, Matteo Calov, Reinhard Talento, Stefanie Greve, Ralf Bernales, Jorjo Klemann, Volker Bagge, Meike Ganopolski, Andrey Sub Algemeen Marine & Atmospheric Res Marine and Atmospheric Research 2024-03-18 application/pdf https://dspace.library.uu.nl/handle/1874/437665 en eng 1814-9324 https://dspace.library.uu.nl/handle/1874/437665 info:eu-repo/semantics/OpenAccess Global and Planetary Change Stratigraphy Palaeontology Article 2024 ftunivutrecht 2024-04-17T14:04:30Z We present transient simulations of the last glacial inception using the Earth system model CLIMBER-X with dynamic vegetation, interactive ice sheets, and visco-elastic solid Earth responses. The simulations are initialized at the middle of the Eemian interglacial (125 kiloyears before present, ka) and run until 100gka, driven by prescribed changes in Earth's orbital parameters and greenhouse gas concentrations from ice core data. CLIMBER-X simulates a rapid increase in Northern Hemisphere ice sheet area through MIS5d, with ice sheets expanding over northern North America and Scandinavia, in broad agreement with proxy reconstructions. While most of the increase in ice sheet area occurs over a relatively short period between 119 and 117gka, the larger part of the increase in ice volume occurs afterwards with an almost constant ice sheet extent. We show that the vegetation feedback plays a fundamental role in controlling the ice sheet expansion during the last glacial inception. In particular, with prescribed present-day vegetation the model simulates a global sea level drop of only g20gm, compared with the g35gm decrease in sea level with dynamic vegetation response. The ice sheet and carbon cycle feedbacks play only a minor role during the ice sheet expansion phase prior to g115gka but are important in limiting the deglaciation during the following phase characterized by increasing summer insolation. The model results are sensitive to climate model biases and to the parameterization of snow albedo, while they show only a weak dependence on changes in the ice sheet model resolution and the acceleration factor used to speed up the climate component. Overall, our simulations confirm and refine previous results showing that climate-vegetation-cryosphere feedbacks play a fundamental role in the transition from interglacial to glacial states characterizing Quaternary glacial cycles. Article in Journal/Newspaper ice core Ice Sheet Utrecht University Repository |
institution |
Open Polar |
collection |
Utrecht University Repository |
op_collection_id |
ftunivutrecht |
language |
English |
topic |
Global and Planetary Change Stratigraphy Palaeontology |
spellingShingle |
Global and Planetary Change Stratigraphy Palaeontology Willeit, Matteo Calov, Reinhard Talento, Stefanie Greve, Ralf Bernales, Jorjo Klemann, Volker Bagge, Meike Ganopolski, Andrey Glacial inception through rapid ice area increase driven by albedo and vegetation feedbacks |
topic_facet |
Global and Planetary Change Stratigraphy Palaeontology |
description |
We present transient simulations of the last glacial inception using the Earth system model CLIMBER-X with dynamic vegetation, interactive ice sheets, and visco-elastic solid Earth responses. The simulations are initialized at the middle of the Eemian interglacial (125 kiloyears before present, ka) and run until 100gka, driven by prescribed changes in Earth's orbital parameters and greenhouse gas concentrations from ice core data. CLIMBER-X simulates a rapid increase in Northern Hemisphere ice sheet area through MIS5d, with ice sheets expanding over northern North America and Scandinavia, in broad agreement with proxy reconstructions. While most of the increase in ice sheet area occurs over a relatively short period between 119 and 117gka, the larger part of the increase in ice volume occurs afterwards with an almost constant ice sheet extent. We show that the vegetation feedback plays a fundamental role in controlling the ice sheet expansion during the last glacial inception. In particular, with prescribed present-day vegetation the model simulates a global sea level drop of only g20gm, compared with the g35gm decrease in sea level with dynamic vegetation response. The ice sheet and carbon cycle feedbacks play only a minor role during the ice sheet expansion phase prior to g115gka but are important in limiting the deglaciation during the following phase characterized by increasing summer insolation. The model results are sensitive to climate model biases and to the parameterization of snow albedo, while they show only a weak dependence on changes in the ice sheet model resolution and the acceleration factor used to speed up the climate component. Overall, our simulations confirm and refine previous results showing that climate-vegetation-cryosphere feedbacks play a fundamental role in the transition from interglacial to glacial states characterizing Quaternary glacial cycles. |
author2 |
Sub Algemeen Marine & Atmospheric Res Marine and Atmospheric Research |
format |
Article in Journal/Newspaper |
author |
Willeit, Matteo Calov, Reinhard Talento, Stefanie Greve, Ralf Bernales, Jorjo Klemann, Volker Bagge, Meike Ganopolski, Andrey |
author_facet |
Willeit, Matteo Calov, Reinhard Talento, Stefanie Greve, Ralf Bernales, Jorjo Klemann, Volker Bagge, Meike Ganopolski, Andrey |
author_sort |
Willeit, Matteo |
title |
Glacial inception through rapid ice area increase driven by albedo and vegetation feedbacks |
title_short |
Glacial inception through rapid ice area increase driven by albedo and vegetation feedbacks |
title_full |
Glacial inception through rapid ice area increase driven by albedo and vegetation feedbacks |
title_fullStr |
Glacial inception through rapid ice area increase driven by albedo and vegetation feedbacks |
title_full_unstemmed |
Glacial inception through rapid ice area increase driven by albedo and vegetation feedbacks |
title_sort |
glacial inception through rapid ice area increase driven by albedo and vegetation feedbacks |
publishDate |
2024 |
url |
https://dspace.library.uu.nl/handle/1874/437665 |
genre |
ice core Ice Sheet |
genre_facet |
ice core Ice Sheet |
op_relation |
1814-9324 https://dspace.library.uu.nl/handle/1874/437665 |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1798847496831631360 |