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Climate modification by future ice sheet changes and consequences for ice sheet mass balance

Vizcaino, M.; Mikolajewicz, U.; Jungclaus, J. and Schurgers, Guy LU (2010) In Climate Dynamics 34(2-3). p.301-324
Abstract
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,... (More)
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. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Ice sheets, Feedbacks in the climate, system, Meridional overturning circulation, Earth system modelling, Anthropogenic climate change
in
Climate Dynamics
volume
34
issue
2-3
pages
301 - 324
publisher
Springer
external identifiers
  • wos:000273808400009
  • scopus:77949275256
ISSN
1432-0894
DOI
10.1007/s00382-009-0591-y
project
Climate Initiative
MERGE
language
English
LU publication?
yes
id
f17b3de7-8bac-41aa-bb48-7979279128f4 (old id 1547337)
date added to LUP
2010-02-24 09:43:37
date last changed
2018-06-17 03:33:20
@article{f17b3de7-8bac-41aa-bb48-7979279128f4,
  abstract     = {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.},
  author       = {Vizcaino, M. and Mikolajewicz, U. and Jungclaus, J. and Schurgers, Guy},
  issn         = {1432-0894},
  keyword      = {Ice sheets,Feedbacks in the climate,system,Meridional overturning circulation,Earth system modelling,Anthropogenic climate change},
  language     = {eng},
  number       = {2-3},
  pages        = {301--324},
  publisher    = {Springer},
  series       = {Climate Dynamics},
  title        = {Climate modification by future ice sheet changes and consequences for ice sheet mass balance},
  url          = {http://dx.doi.org/10.1007/s00382-009-0591-y},
  volume       = {34},
  year         = {2010},
}