Ice sheet‐albedo feedback estimated from most recent deglaciation

Booth, Alice; Goodwin, Philip; Cael, B. B. ORCID: https://orcid.org/0000-0003-1317-5718. 2024 Ice sheet‐albedo feedback estimated from most recent deglaciation. Geophysical Research Letters, 51 (15). https://doi.org/10.1029/2024GL109953

Before downloading, please read NORA policies.

Preview

Text
© 2024. The Author(s).This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Geophysical Research Letters - 2024 - Booth - Ice Sheet‐Albedo Feedback Estimated From Most Recent Deglaciation.pdf - Published Version
Available under License Creative Commons Attribution 4.0.
Download (1MB) | Preview

Official URL: http://dx.doi.org/10.1029/2024GL109953

Abstract/Summary

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.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	https://doi.org/10.1029/2024GL109953
ISSN:	0094-8276
Additional Keywords:	climate sensitivity, slow feedbacks, albedo, ice sheets
Date made live:	22 Aug 2024 10:09 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/537900

Item Type:

Publication - Article

Digital Object Identifier (DOI):

https://doi.org/10.1029/2024GL109953

ISSN:

0094-8276

Additional Keywords:

climate sensitivity, slow feedbacks, albedo, ice sheets

Date made live:

22 Aug 2024 10:09 +0 (UTC)

URI:

https://nora.nerc.ac.uk/id/eprint/537900