A5055952675- Cryospheric studies and observations
- Winter Sports Injuries and Performance
- Arctic and Antarctic ice dynamics
- Landslides and related hazards
- Climate change and permafrost
- Geology and Paleoclimatology Research
- Atmospheric and Environmental Gas Dynamics
- Polar Research and Ecology
- Geophysics and Gravity Measurements
- Methane Hydrates and Related Phenomena
- Climate variability and models
- Meteorological Phenomena and Simulations
- Ionosphere and magnetosphere dynamics
- Hydrology and Watershed Management Studies
- Geological Studies and Exploration
- Icing and De-icing Technologies
- Hydrocarbon exploration and reservoir analysis
- Smart Materials for Construction
- Vibration and Dynamic Analysis
- Dynamics and Control of Mechanical Systems
- Geophysical Methods and Applications
- Geophysics and Sensor Technology
- demographic modeling and climate adaptation
- Spaceflight effects on biology
- Electrical Contact Performance and Analysis
Institut des Géosciences de l'Environnement
2016-2025
Université Grenoble Alpes
2016-2025
Institut polytechnique de Grenoble
2017-2025
Institut de Recherche pour le Développement
2016-2025
Centre National de la Recherche Scientifique
2016-2025
Institut National de Recherche pour l'Agriculture, l'Alimentation et l'Environnement
2023-2025
Université Joseph Fourier
2006-2021
Laboratoire de Glaciologie et Géophysique de l’Environnement
2006-2016
Laboratoire Jean Kuntzmann
2012
Institut national de recherche en informatique et en automatique
2012
Abstract. The Fourth IPCC Assessment Report concluded that ice sheet flow models, in their current state, were unable to provide accurate forecast for the increase of polar discharge and associated contribution sea level rise. Since then, glaciological community has undertaken a huge effort develop improve new generation as result significant number models have emerged. Among them is parallel finite-element model Elmer/Ice, based on open-source multi-physics code Elmer. It was one first...
Abstract. Over the last two decades, Greenland ice sheet (GrIS) has been losing mass at an increasing rate, enhancing its contribution to sea-level rise (SLR). The recent increases in loss appear be due changes both surface balance of and discharge (ice flux ocean). Rapid flow directly affects discharge, but also alters ice-sheet geometry so climate balance. Present-day models only represent rapid approximate fashion and, as a consequence, have never explicitly addressed role on total GrIS...
Antarctica's ice shelves modulate the grounded flow, and weakening of due to climate forcing will decrease their 'buttressing' effect, causing a response in ice. While processes governing ice-shelf are complex, uncertainties sheet also difficult assess. The Antarctic BUttressing Model Intercomparison Project (ABUMIP) compares ice-sheet model responses buttressing by investigating 'end-member' scenario total sustained loss shelves. Although unrealistic, this enables gauging sensitivity an...
Abstract. Knowledge of the ice thickness distribution glaciers and caps is an important prerequisite for many glaciological hydrological investigations. A wealth approaches has recently been presented inferring from characteristics surface. With Ice Thickness Models Intercomparison eXperiment (ITMIX) we performed first coordinated assessment quantifying individual model performance. set 17 different models showed that estimates can differ considerably – locally by a spread comparable to...
Abstract. Oceanic melting beneath ice shelves is the main driver of current mass loss Antarctic sheet and mostly parameterised in stand-alone ice-sheet modelling. Parameterisations are crude representations reality, their response to ocean warming has not been compared 3-D ocean–ice-sheet coupled models. Here, we assess various parameterisations ranging from simple scalings with far-field thermal driving emulators box plume models, using a new coupling framework combining model NEMO...
ABSTRACT Basal slip accounts for a large part of the flow ice streams draining from Antarctica and Greenland into ocean. Therefore, an appropriate representation basal in models is prerequisite accurate sea level rise projections. Various friction laws have been proposed to describe models. Here, we compare influence on grounding line (GL) dynamics four laws: traditional Weertman law three effective pressure-dependent laws, namely Schoof, Tsai Budd laws. It turns out that, even when they are...
Abstract Polar ice is known to be one of the most anisotropic natural materials. For a given fabric polycrystal viscous response strongly dependent on actual state stress and strain rate. Within an sheet, grounded-ice parts shelves have completely different regimes, so should expect impacts anisotropy flow. The aim this work quantify, through concept enhancement factors, influence flow grounded shelves. purpose, full-Stokes marine ice-sheet flowline model used compare isotropic diagnostic...
Abstract It is likely that climate change will have a significant impact on the mass balance of Greenland ice sheet, contributing to future sea-level rise. Here we present implementation full Stokes model Elmer/Ice for which includes mesh refinement technique in order resolve fast-flowing streams and outlet glaciers. We discuss simulations 100 years into future, forced by scenarios defined SeaRISE (Sea-level Response Ice Sheet Evolution) community effort. For comparison, same experiments are...
Abstract. Ice sheet numerical modeling is an important tool to estimate the dynamic contribution of Antarctic ice sea level rise over coming centuries. The influence initial conditions on model simulations, however, still unclear. To better understand this influence, state intercomparison exercise (initMIP) has been developed compare, evaluate, and improve initialization procedures their impact century-scale simulations. initMIP first set experiments Sheet Model Intercomparison Project for...
We assess the effect of enhanced basal sliding on flow and mass budget Greenland ice sheet, using a newly developed parameterization relation between meltwater runoff flow. A wide range observations suggest that water generated by melt at surface sheet reaches its bed both fracture drainage through moulins. Once bed, this is likely to affect lubrication, although current are insufficient determine whether changes in subglacial hydraulics will limit potential for speedup An uncertainty...
Abstract. Earlier large-scale Greenland ice sheet sea-level projections (e.g. those run during the ice2sea and SeaRISE initiatives) have shown that initial conditions a large effect on give rise to important uncertainties. The goal of this initMIP-Greenland intercomparison exercise is compare, evaluate, improve initialisation techniques used in modelling community estimate associated uncertainties modelled mass changes. first series model activities within ISMIP6 (the Ice Sheet Model...
Abstract In ice‐sheet models, slip conditions at the base between ice and bed are parameterized by a friction law. The most common relation has two poorly constrained parameters, C m . basal slipperiness coefficient, , depends on local unobserved quantities is routinely inferred using inverse methods. While model results have shown that transient responses to external forcing highly sensitive stress exponent no consensus value emerged, with values commonly used ranging from 1 depending...
Abstract. We apply a new parameterisation of the Greenland ice sheet (GrIS) feedback between surface mass balance (SMB: sum accumulation and ablation) elevation in MAR regional climate model (Edwards et al., 2014) to projections future change using five models (ISMs). The (Modèle Atmosphérique Régional: Fettweis, 2007) are for 2000–2199, forced by ECHAM5 HadCM3 global (GCMs) under SRES A1B emissions scenario. additional sea level contribution due SMB–elevation averaged over ISM three is 4.3%...
Abstract. Fabric (distribution of crystallographic orientations) along the full NEEM ice core, Greenland was measured in field by an automatic texture analyzer every 10 m, from 33 m down to 2461 depth. The fabric evolves a slightly anisotropic at top, toward strong single maximum about 2300 which is typical deformation pattern mostly driven uniaxial compression and simple shearing. A sharp increase strengthening rate observed Holocene Wisconsin (HW) climatic transition. From model we...
Abstract. Reliable projections of ice sheets' future contributions to sea-level rise require models that are able accurately simulate grounding-line dynamics, starting from initial states consistent with observations. Here, we the centennial evolution Amundsen Sea Embayment in response a prescribed perturbation order assess sensitivity mass loss chosen friction law, depending on initialisation strategy. To this end, three different model constructed by inferring both basal shear stress and...
Abstract The Greenland ice sheet has been one of the largest sources sea-level rise since early 2000s. However, basal melt not included explicitly in assessments ice-sheet mass loss so far. Here, we present first estimate total and regional produced by recent change through time. We find that sheet’s production is 21.4 +4.4/−4.0 Gt per year, generated friction responsible for about half this volume. melting increased 2.9 ± 5.2 during decade As Arctic warms, anticipate will continue to...
Knowing the ice thickness distribution of a glacier is fundamental importance for number applications, ranging from planning glaciological fieldwork to assessments future sea-level change. Across spatial scales, however, this knowledge limited by paucity and discrete character available observations. To obtain spatially coherent thickness, interpolation or numerical models have be used. Whilst first phase Ice Thickness Models Intercomparison eXperiment (ITMIX) focused on approaches that...
Abstract. Observations of ocean-driven grounding-line retreat in the Amundsen Sea Embayment Antarctica raise question an imminent collapse West Antarctic Ice Sheet. Here we analyse committed evolution grounding lines under present-day climate. To this aim, first calibrate a sub-shelf melt parameterization, which is derived from ocean box model, with observed and modelled sensitivities to temperature changes, making it suitable for simulations future sea level projections. Using new...
Abstract. Theoretical and numerical work has shown that under certain circumstances grounding lines of marine-type ice sheets can enter phases irreversible advance retreat driven by the marine sheet instability (MISI). Instances such have been found in several simulations Antarctic Ice Sheet. However, it not assessed whether are already undergoing MISI their current position. Here, we conduct a systematic stability analysis using three state-of-the-art models: Úa, Elmer/Ice, Parallel Sheet...
Abstract The Ice Sheet Model Intercomparison Project for CMIP6 (ISMIP6) is the primary effort of (Coupled Project–Phase 6) focusing on ice sheets, designed to provide an ensemble process‐based projections ice‐sheet contribution sea‐level rise over twenty‐first century. However, behavior Antarctic beyond 2100 remains largely unknown: several instability mechanisms can develop longer time scales, potentially destabilizing large parts Antarctica. Projections evolution until 2300 are presented...
[1] The Glen exponent ncharacterizes the stress-dependence of ice deformation, directly influencing rate at which masses respond to external forcing. slow deformation in large ice-sheets makes laboratory rheometry representative strain-rates difficult. We develop a new technique estimaten in-situ, deploying phase-sensitive radar measure vertical strain rates around 10−4 yr−1within top 1000 m across divides Summit and NEEM, Greenland. A fluid-dynamical feature, Raymond Effect, predicts strong...
Abstract Resistance at the ice‐bed interface provides a strong control on response of ice streams and outlet glaciers to external forcing, yet it is not observable by remote sensing. We used inverse methods constrained satellite observations infer basal resistance flow underneath three Greenland Ice Sheet's largest glaciers. In regions fast high (>250 kPa) driving stresses, often assumed over bed. found, however, that beds these provide almost no under fast‐flowing trunk. Instead,...