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). 10.1029/2024GL109953

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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):	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):

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