The Effect of Obliquity-Driven Changes on Paleoclimate Sensitivity During the Late Pleistocene
We reanalyze existing paleodata of global mean surface temperature ΔTg and radiative forcing ΔR of CO2 and land ice albedo for the last 800,000 years to show that a state-dependency in paleoclimate sensitivity S, as previously suggested, is only found if ΔTg is based on reconstructions, and not when...
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ftleibnizopen:oai:oai.leibnizopen.de:DLu2IJEBBwLIz6xGtg-m 2024-09-15T18:12:25+00:00 The Effect of Obliquity-Driven Changes on Paleoclimate Sensitivity During the Late Pleistocene Köhler, Peter Knorr, Gregor Stap, Lennert B. Ganopolski, Andrey de Boer, Bas van de Wal, Roderik S. W. Barker, Stephen Rüpke, Lars H. 2018 application/pdf https://oa.tib.eu/renate/handle/123456789/10897 https://doi.org/10.34657/9923 eng eng Hoboken, NJ : Wiley CC BY-NC-ND 4.0 Unported https://creativecommons.org/licenses/by-nc-nd/4.0 550 climate sensitivity ECS Pleistocene proxies simulation state dependence Article Text 2018 ftleibnizopen https://doi.org/10.34657/9923 2024-08-05T12:41:46Z We reanalyze existing paleodata of global mean surface temperature ΔTg and radiative forcing ΔR of CO2 and land ice albedo for the last 800,000 years to show that a state-dependency in paleoclimate sensitivity S, as previously suggested, is only found if ΔTg is based on reconstructions, and not when ΔTg is based on model simulations. Furthermore, during times of decreasing obliquity (periods of land ice sheet growth and sea level fall) the multimillennial component of reconstructed ΔTg diverges from CO2, while in simulations both variables vary more synchronously, suggesting that the differences during these times are due to relatively low rates of simulated land ice growth and associated cooling. To produce a reconstruction-based extrapolation of S for the future, we exclude intervals with strong ΔTg-CO2 divergence and find that S is less state-dependent, or even constant state-independent), yielding a mean equilibrium warming of 2–4 K for a doubling of CO2. publishedVersion Article in Journal/Newspaper Ice Sheet LeibnizOpen (The Leibniz Association) |
institution |
Open Polar |
collection |
LeibnizOpen (The Leibniz Association) |
op_collection_id |
ftleibnizopen |
language |
English |
topic |
550 climate sensitivity ECS Pleistocene proxies simulation state dependence |
spellingShingle |
550 climate sensitivity ECS Pleistocene proxies simulation state dependence Köhler, Peter Knorr, Gregor Stap, Lennert B. Ganopolski, Andrey de Boer, Bas van de Wal, Roderik S. W. Barker, Stephen Rüpke, Lars H. The Effect of Obliquity-Driven Changes on Paleoclimate Sensitivity During the Late Pleistocene |
topic_facet |
550 climate sensitivity ECS Pleistocene proxies simulation state dependence |
description |
We reanalyze existing paleodata of global mean surface temperature ΔTg and radiative forcing ΔR of CO2 and land ice albedo for the last 800,000 years to show that a state-dependency in paleoclimate sensitivity S, as previously suggested, is only found if ΔTg is based on reconstructions, and not when ΔTg is based on model simulations. Furthermore, during times of decreasing obliquity (periods of land ice sheet growth and sea level fall) the multimillennial component of reconstructed ΔTg diverges from CO2, while in simulations both variables vary more synchronously, suggesting that the differences during these times are due to relatively low rates of simulated land ice growth and associated cooling. To produce a reconstruction-based extrapolation of S for the future, we exclude intervals with strong ΔTg-CO2 divergence and find that S is less state-dependent, or even constant state-independent), yielding a mean equilibrium warming of 2–4 K for a doubling of CO2. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Köhler, Peter Knorr, Gregor Stap, Lennert B. Ganopolski, Andrey de Boer, Bas van de Wal, Roderik S. W. Barker, Stephen Rüpke, Lars H. |
author_facet |
Köhler, Peter Knorr, Gregor Stap, Lennert B. Ganopolski, Andrey de Boer, Bas van de Wal, Roderik S. W. Barker, Stephen Rüpke, Lars H. |
author_sort |
Köhler, Peter |
title |
The Effect of Obliquity-Driven Changes on Paleoclimate Sensitivity During the Late Pleistocene |
title_short |
The Effect of Obliquity-Driven Changes on Paleoclimate Sensitivity During the Late Pleistocene |
title_full |
The Effect of Obliquity-Driven Changes on Paleoclimate Sensitivity During the Late Pleistocene |
title_fullStr |
The Effect of Obliquity-Driven Changes on Paleoclimate Sensitivity During the Late Pleistocene |
title_full_unstemmed |
The Effect of Obliquity-Driven Changes on Paleoclimate Sensitivity During the Late Pleistocene |
title_sort |
effect of obliquity-driven changes on paleoclimate sensitivity during the late pleistocene |
publisher |
Hoboken, NJ : Wiley |
publishDate |
2018 |
url |
https://oa.tib.eu/renate/handle/123456789/10897 https://doi.org/10.34657/9923 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_rights |
CC BY-NC-ND 4.0 Unported https://creativecommons.org/licenses/by-nc-nd/4.0 |
op_doi |
https://doi.org/10.34657/9923 |
_version_ |
1810450001640292352 |