Numerical modeling of the dynamics of the Mer de Glace glacier, French Alps: comparison with past observations and forecasting of near-future evolution

Alpine glaciers are shrinking and rapidly loosing mass in a warming climate. Glacier modeling is required to assess the future consequences of these retreats on water resources, the hydropower industry and risk management. However, the performance of such ice flow modeling is generally difficult to...

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Bibliographic Details
Published in:The cryosphere 2020-11, Vol.14 (11), p.3979-3994
Main Authors: Peyaud, Vincent, Bouchayer, Coline, Gagliardini, Olivier, Vincent, Christian, Gillet-Chaulet, Fabien, Six, Delphine, Laarman, Olivier
Format: Article
Language:English
Subjects:
Analysis
Boundary conditions
Climate
Climate change
Climate models
Computational fluid dynamics
Earth Sciences
Evolution
Flow velocity
Glacier flow
Glacier variations
Glaciers
Glaciology
Global warming
Hydroelectric power
Ice
Ice cover
Length
Mass balance
Modelling
Mountain glaciers
Observatories
Performance assessment
Resource management
Risk management
Sciences of the Universe
Simulation
Topography
Velocity
Water resource management
Water resources
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Summary:Alpine glaciers are shrinking and rapidly loosing mass in a warming climate. Glacier modeling is required to assess the future consequences of these retreats on water resources, the hydropower industry and risk management. However, the performance of such ice flow modeling is generally difficult to evaluate because of the lack of long-term glaciological observations. Here, we assess the performance of the Elmer/Ice full Stokes ice flow model using the long dataset of mass balance, thickness change, ice flow velocity and snout fluctuation measurements obtained between 1979 and 2015 on the Mer de Glace glacier, France. Ice flow modeling results are compared in detail to comprehensive glaciological observations over 4 decades including both a period of glacier expansion preceding a long period of decay. To our knowledge, a comparison to data at this detail is unprecedented. We found that the model accurately reconstructs the velocity, elevation and length variations of this glacier despite some discrepancies that remain unexplained. The calibrated and validated model was then applied to simulate the future evolution of Mer de Glace from 2015 to 2050 using 26 different climate scenarios. Depending on the climate scenarios, the largest glacier in France, with a length of 20 km, could retreat by 2 to 6 km over the next 3 decades.
ISSN:1994-0424
1994-0416
1994-0424
1994-0416
DOI:10.5194/tc-14-3979-2020