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

Urheber*innen
/persons/resource/zeitz

Zeitz,  Maria
Potsdam Institute for Climate Impact Research;

/persons/resource/Ronja.Reese

Reese,  Ronja
Potsdam Institute for Climate Impact Research;

/persons/resource/Johanna.Beckmann

Beckmann,  Johanna
Potsdam Institute for Climate Impact Research;

Krebs-Kanzow,  Uta
External Organizations;

/persons/resource/Ricarda.Winkelmann

Winkelmann,  Ricarda       
Potsdam Institute for Climate Impact Research;

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26432oa.pdf
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Zitation

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


Zitierlink: https://publications.pik-potsdam.de/pubman/item/item_26432
Zusammenfassung
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.