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Other research product . 2018

Sensitivity of a Greenland ice sheet model to atmospheric forcing fields

Quiquet, A.; Punge, H. J.; Ritz, C.; Fettweis, X.; Gallée, H.; Kageyama, M.; Krinner, G.; +2 Authors
Open Access
English
Published: 27 Sep 2018
Abstract

Predicting the climate for the future and how it will impact ice sheet evolution requires coupling ice sheet models with climate models. However, before we attempt to develop a realistic coupled setup, we propose, in this study, to first analyse the impact of a model simulated climate on an ice sheet. We undertake this exercise for a set of regional and global climate models. Modelled near surface air temperature and precipitation are provided as upper boundary conditions to the GRISLI (GRenoble Ice Shelf and Land Ice model) hybrid ice sheet model (ISM) in its Greenland configuration. After 20 kyrs of simulation, the resulting ice sheets highlight the differences between the climate models. While modelled ice sheet sizes are generally comparable to the observed one, there are considerable deviations among the ice sheets on regional scales. These deviations can be explained by biases in temperature and precipitation near the coast. This is especially true in the case of global models. But the deviations between the climate models are also due to the differences in the atmospheric general circulation. To account for these differences in the context of coupling ice sheet models with climate models, we conclude that appropriate downscaling methods will be needed. In some cases, systematic corrections of the climatic variables at the interface may be required to obtain realistic results for the Greenland ice sheet (GIS).

Subjects by Vocabulary

arXiv: Physics::Atmospheric and Oceanic Physics Physics::Geophysics Astrophysics::Earth and Planetary Astrophysics

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Funded by
EC| COMBINE
Project
COMBINE
Comprehensive Modelling of the Earth system for better climate prediction and projection
  • Funder: European Commission (EC)
  • Project Code: 226520
  • Funding stream: FP7 | SP1 | ENV
,
EC| ICE2SEA
Project
ICE2SEA
Ice2sea - estimating the future contribution of continental ice to sea-level rise
  • Funder: European Commission (EC)
  • Project Code: 226375
  • Funding stream: FP7 | SP1 | ENV
Related to Research communities
European Marine Science Marine Environmental Science : Estimating the future contribution of continental ice to sea-level rise
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