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  Impact of the melt–albedo feedback on the future evolution of the Greenland Ice Sheet with PISM-dEBM-simple

Zeitz, M., Reese, R., Beckmann, J., Krebs-Kanzow, U., Winkelmann, R. (2021): Impact of the melt–albedo feedback on the future evolution of the Greenland Ice Sheet with PISM-dEBM-simple. - The Cryosphere, 15, 12, 5739-5764.
https://doi.org/10.5194/tc-15-5739-2021

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Zeitz, Maria1, Author              
Reese, Ronja1, Author              
Beckmann, Johanna1, Author              
Krebs-Kanzow, Uta2, Author
Winkelmann, Ricarda1, Author              
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1Potsdam Institute for Climate Impact Research, ou_persistent13              
2External Organizations, ou_persistent22              

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 Abstract: Surface melting of the Greenland Ice Sheet contributes a large amount to current and future sea level rise. Increased surface melt may lower the reflectivity of the ice sheet surface and thereby increase melt rates: the so-called melt–albedo feedback describes this self-sustaining increase in surface melting. In order to test the effect of the melt– albedo feedback in a prognostic ice sheet model, we imple- ment dEBM-simple, a simplified version of the diurnal En- ergy Balance Model dEBM, in the Parallel Ice Sheet Model (PISM). The implementation includes a simple representation of the melt–albedo feedback and can thereby replace the positive-degree-day melt scheme. Using PISM-dEBM- simple, we find that this feedback increases ice loss through surface warming by 60 % until 2300 for the high-emission scenario RCP8.5 when compared to a scenario in which the albedo remains constant at its present-day values. With an increase of 90 % compared to a fixed-albedo scenario, the effect is more pronounced for lower surface warming under RCP2.6. Furthermore, assuming an immediate darkening of the ice surface over all summer months, we estimate an up- per bound for this effect to be 70 % in the RCP8.5 scenario and a more than 4-fold increase under RCP2.6. With dEBM- simple implemented in PISM, we find that the melt–albedo feedback is an essential contributor to mass loss in dynamic simulations of the Greenland Ice Sheet under future warming.

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 Dates: 2021-03-122021-11-082021-12-202021-12-20
 Publication Status: Finally published
 Pages: -
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: PIKDOMAIN: RD1 - Earth System Analysis
Organisational keyword: FutureLab - Earth Resilience in the Anthropocene
Research topic keyword: Ice
Research topic keyword: Sea-level Rise
Regional keyword: Arctic & Antarctica
Model / method: PISM-PIK
MDB-ID: Entry suspended
DOI: 10.5194/tc-15-5739-2021
OATYPE: Gold Open Access
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Title: The Cryosphere
Source Genre: Journal, SCI, Scopus, p3, oa
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Pages: - Volume / Issue: 15 (12) Sequence Number: - Start / End Page: 5739 - 5764 Identifier: CoNE: https://publications.pik-potsdam.de/cone/journals/resource/140507
Publisher: Copernicus