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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Online Access: | https://epic.awi.de/id/eprint/47687/ https://epic.awi.de/id/eprint/47687/1/koehler2018grl.pdf https://doi.org/10.1029/2018GL077717 https://hdl.handle.net/10013/epic.e886048d-8842-4771-9418-d0bceeb0b073 https://hdl.handle.net/ |
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ftawi:oai:epic.awi.de:47687 2023-05-15T16:40:53+02:00 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://epic.awi.de/id/eprint/47687/ https://epic.awi.de/id/eprint/47687/1/koehler2018grl.pdf https://doi.org/10.1029/2018GL077717 https://hdl.handle.net/10013/epic.e886048d-8842-4771-9418-d0bceeb0b073 https://hdl.handle.net/ unknown Wiley https://epic.awi.de/id/eprint/47687/1/koehler2018grl.pdf https://hdl.handle.net/ Köhler, P. orcid:0000-0003-0904-8484 , Knorr, G. orcid:0000-0002-8317-5046 , Stap, L. B. orcid:0000-0002-2108-3533 , Ganopolski, A. , de Boer, B. , van de Wal, R. S. W. , Barker, S. and Rüpke, L. H. (2018) The Effect of Obliquity-Driven Changes on Paleoclimate Sensitivity During the Late Pleistocene , Geophysical Research Letters, 45 (13), pp. 6661-6671 . doi:10.1029/2018GL077717 <https://doi.org/10.1029/2018GL077717> , hdl:10013/epic.e886048d-8842-4771-9418-d0bceeb0b073 EPIC3Geophysical Research Letters, Wiley, 45(13), pp. 6661-6671, ISSN: 00948276 Article isiRev 2018 ftawi https://doi.org/10.1029/2018GL077717 2021-12-24T15:44:00Z 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. Article in Journal/Newspaper Ice Sheet Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Geophysical Research Letters 45 13 6661 6671 |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
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. |
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. |
spellingShingle |
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 |
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 |
Wiley |
publishDate |
2018 |
url |
https://epic.awi.de/id/eprint/47687/ https://epic.awi.de/id/eprint/47687/1/koehler2018grl.pdf https://doi.org/10.1029/2018GL077717 https://hdl.handle.net/10013/epic.e886048d-8842-4771-9418-d0bceeb0b073 https://hdl.handle.net/ |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
EPIC3Geophysical Research Letters, Wiley, 45(13), pp. 6661-6671, ISSN: 00948276 |
op_relation |
https://epic.awi.de/id/eprint/47687/1/koehler2018grl.pdf https://hdl.handle.net/ Köhler, P. orcid:0000-0003-0904-8484 , Knorr, G. orcid:0000-0002-8317-5046 , Stap, L. B. orcid:0000-0002-2108-3533 , Ganopolski, A. , de Boer, B. , van de Wal, R. S. W. , Barker, S. and Rüpke, L. H. (2018) The Effect of Obliquity-Driven Changes on Paleoclimate Sensitivity During the Late Pleistocene , Geophysical Research Letters, 45 (13), pp. 6661-6671 . doi:10.1029/2018GL077717 <https://doi.org/10.1029/2018GL077717> , hdl:10013/epic.e886048d-8842-4771-9418-d0bceeb0b073 |
op_doi |
https://doi.org/10.1029/2018GL077717 |
container_title |
Geophysical Research Letters |
container_volume |
45 |
container_issue |
13 |
container_start_page |
6661 |
op_container_end_page |
6671 |
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1766031307789303808 |