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          Institute: MPI für Meteorologie     Collection: Ocean in the Earth System     Display Documents



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ID: 377799.0, MPI für Meteorologie / Ocean in the Earth System
Climate modification by future ice sheet changes and consequences for ice sheet mass balance
Authors:Vizcaino, M.; Mikolajewicz, U.; Jungclaus, J.; Schurgers, G.
Language:English
Date of Publication (YYYY-MM-DD):2010
Title of Journal:Climate Dynamics
Journal Abbrev.:Clim. Dyn.
Volume:34
Start Page:301
End Page:324
Review Status:Peer-review
Audience:Not Specified
Abstract / Description:The future evolution of global ice sheets under anthropogenic greenhouse forcing and its impact on the climate system, including the regional climate of the ice sheets, are investigated with a comprehensive earth system model consisting of a coupled Atmosphere-Ocean General Circulation Model, a dynamic vegetation model and an ice sheet model. The simulated control climate is realistic enough to permit a direct coupling of the atmosphere and ice sheet components, avoiding the use of anomaly coupling, which represents a strong improvement with respect to previous modelling studies. Glacier ablation is calculated with an energy-balance scheme, a more physical approach than the commonly used degree-day method. Modifications of glacier mask, topographic height and freshwater fluxes by the ice sheets influence the atmosphere and ocean via dynamical and thermodynamical processes. Several simulations under idealized scenarios of greenhouse forcing have been performed, where the atmospheric carbon dioxide stabilizes at two and four times pre-industrial levels. The evolution of the climate system and the ice sheets in the simulations with interactive ice sheets is compared with the simulations with passively coupled ice sheets. For a four-times CO2 scenario forcing, a faster decay rate of the Greenland ice sheet is found in the non-interactive case, where melting rates are higher. This is caused by overestimation of the increase in near-surface temperature that follows the reduction in topographic height. In areas close to retreating margins, melting rates are stronger in the interactive case, due to changes in local albedo. Our results call for careful consideration of the feedbacks operating between ice sheets and climate after substantial decay of the ice sheets.
Free Keywords:Ice sheets; Anthropogenic climate change; Feedbacks in the climate system; Meridional overturning circulation; Earth system modelling
External Publication Status:published
Document Type:Article
Communicated by:Carola Kauhs
Affiliations:MPI für Meteorologie/Ocean in the Earth System
MPI für Meteorologie/IMPRS Earth System Modelling
Identifiers:DOI:10.1007/s00382-009-0591-y
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