A5042973613- Cryospheric studies and observations
- Climate change and permafrost
- Winter Sports Injuries and Performance
- Arctic and Antarctic ice dynamics
- Landslides and related hazards
- Geology and Paleoclimatology Research
- Climate variability and models
- Methane Hydrates and Related Phenomena
- Geophysics and Gravity Measurements
- Geological Studies and Exploration
- Meteorological Phenomena and Simulations
- Atmospheric and Environmental Gas Dynamics
- Hydrocarbon exploration and reservoir analysis
- Ocean Acidification Effects and Responses
- Polar Research and Ecology
- Hydrology and Watershed Management Studies
- Remote Sensing and LiDAR Applications
- Forest ecology and management
- Advanced Image Fusion Techniques
- High Altitude and Hypoxia
- Science and Climate Studies
- Image and Signal Denoising Methods
- Advanced Image Processing Techniques
- Seismic Imaging and Inversion Techniques
- Geological and Geochemical Analysis
University of Liège
2013-2025
Utrecht University
2015-2024
University of Edinburgh
2022
We reconstruct the mass balance of Greenland Ice Sheet using a comprehensive survey thickness, surface elevation, velocity, and (SMB) 260 glaciers from 1972 to 2018. calculate discharge, D, into ocean directly for 107 (85% D) indirectly 110 (15%) velocity-scaled reference fluxes. The decadal switched gain +47 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mo>±</mml:mo> </mml:math> 21 Gt/y in 1972–1980 loss 51 17 1980–1990. increased 41 1990–2000, 187...
Abstract Greenland's bed topography is a primary control on ice flow, grounding line migration, calving dynamics, and subglacial drainage. Moreover, fjord bathymetry regulates the penetration of warm Atlantic water (AW) that rapidly melts undercuts marine‐terminating glaciers. Here we present new compilation Greenland assimilates seafloor thickness data through mass conservation approach. A 150 m horizontal resolution topography/bathymetric map constructed with seamless transitions at...
Abstract. We evaluate modelled Antarctic ice sheet (AIS) near-surface climate, surface mass balance (SMB) and energy (SEB) from the updated polar version of regional atmospheric climate model, RACMO2 (1979–2016). The referred to as RACMO2.3p2, incorporates upper-air relaxation, a revised topography, tuned parameters in cloud scheme generate more precipitation towards AIS interior modified snow properties reducing drifting sublimation increasing snowmelt. Comparisons model output with several...
<strong class="journal-contentHeaderColor">Abstract.</strong> We assess the recent contribution of Greenland ice sheet (GrIS) to sea level change. use mass budget method, which quantifies balance (MB) as difference between surface (SMB) and solid discharge across grounding line (<i>D</i>). A comparison with independent gravity change observations from GRACE shows good agreement for overlapping period 2002â2015, giving confidence in partitioning GrIS changes. The estimated 1995 value...
Abstract The Greenland Ice Sheet is losing mass at accelerated rates in the 21st century, making it largest single contributor to rising sea levels. Faster flow of outlet glaciers has substantially contributed this loss, with cause speedup, and potential for future change, uncertain. Here we combine more than three decades remotely sensed observational products glacier velocity, elevation, front position changes over full ice sheet. We compare decadal variability discharge calving find that...
Abstract. We evaluate modelled Greenland ice sheet (GrIS) near-surface climate, surface energy balance (SEB) and mass (SMB) from the updated regional climate model RACMO2 (1958–2016). The new version, referred to as RACMO2.3p2, incorporates glacier outlines, topography albedo fields. Parameters in cloud scheme governing conversion of condensate into precipitation have been tuned correct inland snowfall underestimation: snow properties are modified reduce drifting melt production percolation...
Predicting Greenland Ice Sheet mass loss due to ice dynamics requires a complete understanding of spatiotemporal velocity fluctuations and related control mechanisms. We present 5 year record seasonal measurements for 55 marine-terminating glaciers distributed around the sheet margin, along with ice-front position runoff data sets each glacier. Among substantial speed variations, we find three distinct patterns. One pattern indicates relatively high glacier sensitivity position. The other...
Abstract We examine data continuity between the Gravity Recovery and Climate Experiment (GRACE) GRACE Follow‐On (FO) missions over Greenland Antarctica using independent from mass budget method, which calculates difference ice sheet surface balance discharge at periphery. For both sheets, we find consistent GRACE/GRACE‐FO time series across gap, continental regional scales, gap is confidently filled with method data. In Greenland, GRACE‐FO reveal an exceptional summer loss of 600 Gt in 2019...
Since the early 1990s, Greenland ice sheet (GrIS) has been losing mass at an accelerating rate, primarily due to enhanced meltwater runoff following atmospheric warming. Here, we show that a pronounced latitudinal contrast exists in GrIS response recent The ablation area north expanded by 46%, almost twice as much south (+25%), significantly increasing relative contribution of total loss. This originates from different change large-scale Arctic summertime circulation, promoting southwesterly...
Abstract The Greenland ice sheet has become one of the main contributors to global sea level rise, predominantly through increased meltwater runoff. drivers runoff, however, remain poorly understood. Here we show that clouds enhance runoff by about one-third relative clear skies, using a unique combination active satellite observations, climate model data and snow simulations. This impact results from cloud radiative effect 29.5 (±5.2) W m −2 . Contrary conventional wisdom, responds this...
Abstract. We discuss Greenland Ice Sheet (GrIS) surface mass balance (SMB) differences between the updated polar version of RACMO climate model (RACMO2.3) and previous (RACMO2.1). Among other revisions, includes an adjusted rainfall-to-snowfall conversion that produces exclusively snowfall under freezing conditions; this especially favours in summer. Summer ablation zone GrIS has a pronounced effect on melt rates, affecting modelled SMB two ways. By covering relatively dark ice with highly...
Abstract. Observations and models agree that the Greenland Ice Sheet (GrIS) surface mass balance (SMB) has decreased since end of 1990s due to an increase in meltwater runoff this trend will accelerate future. However, large uncertainties remain, partly different approaches for modelling GrIS SMB, which have weigh physical complexity or low computing time, spatial temporal resolutions, forcing fields, ice sheet topographies extents, collectively make inter-comparison difficult. Our SMB model...
Abstract We map recent Greenland Ice Sheet elevation change at high spatial (5 km) and temporal (monthly) resolution using CryoSat‐2 altimetry. After correcting for the impact of changing snowpack properties associated with unprecedented surface melting in 2012, we find good agreement (3 cm/yr bias) airborne measurements. With aid regional climate firn modeling, compute records mass evolution, which correlate ( R = 0.96) monthly satellite gravimetry reveal glacier dynamic imbalance. During...
Abstract The freshwater budget of the Arctic and sub‐polar North Atlantic Oceans has been changing due, primarily, to increased river runoff, declining sea ice enhanced melting land ice. Since mid‐1990s this latter component experienced a pronounced increase. We use combination satellite observations glacier flow speed regional climate modeling reconstruct flux from Greenland sheet glaciers caps for period 1958–2016. cumulative anomaly exceeded 6,300 ± 316 km 3 by 2016. This is roughly twice...
Abstract. This study presents a data set of daily, 1 km resolution Greenland ice sheet (GrIS) surface mass balance (SMB) covering the period 1958–2015. Applying corrections for elevation, bare albedo and accumulation bias, high-resolution product is statistically downscaled from native daily output polar regional climate model RACMO2.3 at 11 km. The includes all individual SMB components projected to down-sampled version Ice Mapping Project (GIMP) digital elevation mask. mask better resolves...
Many Greenland glaciers have been attacked by the ocean from below and, in turn, contributed to sea-level rise ice sheet.
Abstract. Ice losses from the Greenland and Antarctic ice sheets have accelerated since 1990s, accounting for a significant increase in global mean sea level. Here, we present new 29-year record of sheet mass balance 1992 to 2020 Sheet Mass Balance Inter-comparison Exercise (IMBIE). We compare combine 50 independent estimates derived satellite observations temporal changes flow, volume, Earth's gravity field. Between 2020, contributed 21.0±1.9 mm level, with rate loss rising 105 Gt yr−1...
Abstract Ice loss from the Greenland ice sheet is one of largest sources contemporary sea-level rise (SLR). While process-based models place timescales on Greenland’s deglaciation, their confidence obscured by model shortcomings including imprecise atmospheric and oceanic couplings. Here, we present a complementary approach resolving disequilibrium with climate constrained satellite-derived bare-ice extent, tidewater sector flow discharge surface mass balance data. We find that imbalance...
Runoff has recently become the main source of mass loss from Greenland Ice Sheet and is an important contributor to global sea level rise. Linking runoff surface meltwater production complex, as can be retained within firn by refreezing or perennial liquid water storage. To constrain these uncertainties, outputs two offline snow/firn models different complexity (IMAU-FDM SNOWPACK) are compared assess sensitivity retention model formulation (e.g., densification, irreducible content, vertical...
Abstract Meltwater from the Greenland Ice Sheet often drains subglacially into fjords, driving upwelling plumes at glacier termini. Ocean models and observations of submarine termini suggest that enhance melt undercutting, leading to calving potential destabilization. Here we systematically evaluate how simulated plume structure during summer months depends on realistic ranges subglacial discharge, depth, ocean stratification 12 fjords. Our results show grounding line depth is a strong...
Surface processes currently dominate Greenland ice sheet (GrIS) mass loss. We review recent developments in the observation and modeling of GrIS surface balance (SMB), published after July 2012 deadline for Fifth Assessment Report Intergovernmental Panel on Climate Change (IPCC AR5). Since IPCC AR5, our understanding SMB has further improved, but new observational model studies have also revealed that temporal spatial variability many are still poorly quantified understood, e.g., bio-albedo,...