Inverse Modeling of the Greenland Ice Sheet Flow Dynamics: from Local Sensitivity to Large-Scale Model Initialisation

Fabien Gillet-Chaulet (1) , Olivier Gagliardini (1) , Jerome Monnier (2) , Nathan Martin (2) , Catherine Ritz (1) , Maëlle Nodet (3)

1 EDGe
2 IMT - Institut de Mathématiques de Toulouse UMR5219
3 MOISE - Modelling, Observations, Identification for Environmental Sciences

Over the last two decades, the Greenland Ice Sheet has been losing mass at an increasing rate, with an important contribution coming from acceleration and thinning of numerous outlet glaciers. Representing these changes in flow models is a challenge requiring the development of (i) grid refinement strategies to capture individually the narrow outlet glaciers, (ii) efficient numerical schemes to solve the appropriate flow equations and (iii) inverse methods to constrain poorly known parameters. Here, we will present details and applications of these recent developments from local sensitivity analysis to large-scale model initialisation

Domaines: Optimisation et contrôle [math.OC]; Glaciologie

Fabien Gillet-Chaulet, Olivier Gagliardini, Jerome Monnier, Nathan Martin, Catherine Ritz, et al.. Inverse Modeling of the Greenland Ice Sheet Flow Dynamics: from Local Sensitivity to Large-Scale Model Initialisation. SIAM Conference on Mathematical & Computational Issues in the Geosciences, Jun 2013, Padova, Italy. ⟨hal-00921895⟩