Ice Sheet‐Albedo Feedback Estimated From Most Recent Deglaciation
Abstract Ice sheet feedbacks are underrepresented in model assessments of climate sensitivity and their magnitudes are still poorly constrained. We combine a recently published record of Earth's Energy Imbalance (EEI) with existing reconstructions of temperature, atmospheric composition, and se...
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ftdoajarticles:oai:doaj.org/article:f261ac2ccdbc4ab7bf4c97037316e2e2 2024-09-15T18:12:07+00:00 Ice Sheet‐Albedo Feedback Estimated From Most Recent Deglaciation Alice Booth Philip Goodwin B. B. Cael 2024-08-01T00:00:00Z https://doi.org/10.1029/2024GL109953 https://doaj.org/article/f261ac2ccdbc4ab7bf4c97037316e2e2 EN eng Wiley https://doi.org/10.1029/2024GL109953 https://doaj.org/toc/0094-8276 https://doaj.org/toc/1944-8007 1944-8007 0094-8276 doi:10.1029/2024GL109953 https://doaj.org/article/f261ac2ccdbc4ab7bf4c97037316e2e2 Geophysical Research Letters, Vol 51, Iss 15, Pp n/a-n/a (2024) climate sensitivity slow feedbacks albedo ice sheets Geophysics. Cosmic physics QC801-809 article 2024 ftdoajarticles https://doi.org/10.1029/2024GL109953 2024-08-19T14:56:40Z Abstract Ice sheet feedbacks are underrepresented in model assessments of climate sensitivity and their magnitudes are still poorly constrained. We combine a recently published record of Earth's Energy Imbalance (EEI) with existing reconstructions of temperature, atmospheric composition, and sea level to estimate both the magnitude and timescale of the ice sheet‐albedo feedback since the Last Glacial Maximum. This facilitates the first opportunity to quantify this feedback over the most recent deglaciation using a proxy data‐driven approach. We find the ice sheet‐albedo feedback to be amplifying, increasing the total climate feedback parameter by 42% and reaching an equilibrium magnitude of 0.55 Wm−2K−1, with a 66% confidence interval of 0.45–0.63 Wm−2K−1. The timescale to equilibrium is estimated as 3.6 ka (66% confidence: 1.9–5.5 ka). These results provide new evidence for the timescale and magnitude of the amplifying ice sheet‐albedo feedback that will drive anthropogenic warming for millennia to come. Article in Journal/Newspaper Ice Sheet Directory of Open Access Journals: DOAJ Articles Geophysical Research Letters 51 15 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
climate sensitivity slow feedbacks albedo ice sheets Geophysics. Cosmic physics QC801-809 |
spellingShingle |
climate sensitivity slow feedbacks albedo ice sheets Geophysics. Cosmic physics QC801-809 Alice Booth Philip Goodwin B. B. Cael Ice Sheet‐Albedo Feedback Estimated From Most Recent Deglaciation |
topic_facet |
climate sensitivity slow feedbacks albedo ice sheets Geophysics. Cosmic physics QC801-809 |
description |
Abstract Ice sheet feedbacks are underrepresented in model assessments of climate sensitivity and their magnitudes are still poorly constrained. We combine a recently published record of Earth's Energy Imbalance (EEI) with existing reconstructions of temperature, atmospheric composition, and sea level to estimate both the magnitude and timescale of the ice sheet‐albedo feedback since the Last Glacial Maximum. This facilitates the first opportunity to quantify this feedback over the most recent deglaciation using a proxy data‐driven approach. We find the ice sheet‐albedo feedback to be amplifying, increasing the total climate feedback parameter by 42% and reaching an equilibrium magnitude of 0.55 Wm−2K−1, with a 66% confidence interval of 0.45–0.63 Wm−2K−1. The timescale to equilibrium is estimated as 3.6 ka (66% confidence: 1.9–5.5 ka). These results provide new evidence for the timescale and magnitude of the amplifying ice sheet‐albedo feedback that will drive anthropogenic warming for millennia to come. |
format |
Article in Journal/Newspaper |
author |
Alice Booth Philip Goodwin B. B. Cael |
author_facet |
Alice Booth Philip Goodwin B. B. Cael |
author_sort |
Alice Booth |
title |
Ice Sheet‐Albedo Feedback Estimated From Most Recent Deglaciation |
title_short |
Ice Sheet‐Albedo Feedback Estimated From Most Recent Deglaciation |
title_full |
Ice Sheet‐Albedo Feedback Estimated From Most Recent Deglaciation |
title_fullStr |
Ice Sheet‐Albedo Feedback Estimated From Most Recent Deglaciation |
title_full_unstemmed |
Ice Sheet‐Albedo Feedback Estimated From Most Recent Deglaciation |
title_sort |
ice sheet‐albedo feedback estimated from most recent deglaciation |
publisher |
Wiley |
publishDate |
2024 |
url |
https://doi.org/10.1029/2024GL109953 https://doaj.org/article/f261ac2ccdbc4ab7bf4c97037316e2e2 |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Geophysical Research Letters, Vol 51, Iss 15, Pp n/a-n/a (2024) |
op_relation |
https://doi.org/10.1029/2024GL109953 https://doaj.org/toc/0094-8276 https://doaj.org/toc/1944-8007 1944-8007 0094-8276 doi:10.1029/2024GL109953 https://doaj.org/article/f261ac2ccdbc4ab7bf4c97037316e2e2 |
op_doi |
https://doi.org/10.1029/2024GL109953 |
container_title |
Geophysical Research Letters |
container_volume |
51 |
container_issue |
15 |
_version_ |
1810449708623069184 |