A5035230077- Cryospheric studies and observations
- Winter Sports Injuries and Performance
- Climate change and permafrost
- Arctic and Antarctic ice dynamics
- Geophysics and Gravity Measurements
- Landslides and related hazards
- Geology and Paleoclimatology Research
- Climate variability and models
- Methane Hydrates and Related Phenomena
- Geomagnetism and Paleomagnetism Studies
- Meteorological Phenomena and Simulations
- Solar and Space Plasma Dynamics
- Atmospheric and Environmental Gas Dynamics
- Polar Research and Ecology
- Oceanographic and Atmospheric Processes
- GNSS positioning and interference
- Geological Studies and Exploration
- Scientific Research and Discoveries
- Spacecraft and Cryogenic Technologies
- Inertial Sensor and Navigation
- High Altitude and Hypoxia
- demographic modeling and climate adaptation
- Computational Physics and Python Applications
- Planetary Science and Exploration
- Neural Networks and Applications
Delft University of Technology
2009-2025
Utrecht University
2016-2025
Royal Netherlands Meteorological Institute
2009-2024
KU Leuven
2024
European Space Agency
2024
European Space Research Institute
2024
Elia (Belgium)
2022
Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung
2022
University of Bristol
2012-2019
Hubrecht Institute for Developmental Biology and Stem Cell Research
2018
Glaciers distinct from the Greenland and Antarctic Ice Sheets are losing large amounts of water to world's oceans. However, estimates their contribution sea level rise disagree. We provide a consensus estimate by standardizing existing, creating new, mass-budget satellite gravimetry altimetry local glaciological records. In many regions, measurements more negative than satellite-based estimates. All regions lost mass during 2003-2009, with largest losses Arctic Canada, Alaska, coastal...
Mass budget calculations, validated with satellite gravity observations [from the Gravity Recovery and Climate Experiment (GRACE) satellites], enable us to quantify individual components of recent Greenland mass loss. The total 2000-2008 loss approximately 1500 gigatons, equivalent 0.46 millimeters per year global sea level rise, is equally split between surface processes (runoff precipitation) ice dynamics. Without moderating effects increased snowfall refreezing, post-1996 sheet losses...
Key observational indicators of climate change in the Arctic, most spanning a 47 year period (1971–2017) demonstrate fundamental changes among nine key elements Arctic system. We find that, coherent with increasing air temperature, there is an intensification hydrological cycle, evident from increases humidity, precipitation, river discharge, glacier equilibrium line altitude and land ice wastage. Downward trends continue sea thickness (and extent) spring snow cover extent duration, while...
Abstract. Global mean sea level is an integral of changes occurring in the climate system response to unforced variability as well natural and anthropogenic forcing factors. Its temporal evolution allows (e.g., acceleration) be detected one or more components. Study sea-level budget provides constraints on missing poorly known contributions, such unsurveyed deep ocean still uncertain land water component. In context World Climate Research Programme Grand Challenge entitled Regional Sea Level...
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 This study evaluates the impact of a recent upgrade in physics package regional atmospheric climate model RACMO2 on simulated surface mass balance (SMB) Antarctic ice sheet. The modelled SMB increases, particular over grounded sheet East Antarctica (+44 Gt –1 ), with small change West Antarctica. mainly results from an increase precipitation, which is explained by changes cloud microphysics, including new parameterization for supersaturation, and large-scale circulation patterns,...
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. A combined analysis of remote sensing observations, regional climate model (RCM) outputs and reanalysis data over the Greenland ice sheet provides evidence that multiple records were set during summer 2012. Melt extent was largest in satellite era (extending up to ∼97% sheet) melting lasted ∼2 months longer than 1979–2011 mean. Model results indicate near surface temperature ∼3 standard deviations (σ) above 1958–2011 mean, while mass balance (SMB) ∼3σ below mean runoff 3.9σ same...
Using satellite gravity data between February 2003 and January 2008, we examine changes in Greenland's mass distribution on a regional scale. During this period, Greenland lost at mean rate of 179 ± 25 Gt/yr, equivalent to global sea level change 0.5 0.1 mm/yr. Rates increase over time, suggesting an acceleration the loss, driven by loss during summer. The largest losses occurred along southeastern northwestern coast summers 2005 2007, when ice sheet 279 Gt 328 respectively within 2 months....
Abstract Between 2003-2016, the Greenland ice sheet (GrIS) was one of largest contributors to sea level rise, as it lost about 255 Gt per year. This mass loss slowed in 2017 and 2018 100 yr −1 . Here we examine further changes rate GrIS loss, by analyzing data from GRACE-FO (Gravity Recovery Climate Experiment – Follow On) satellite mission, launched May 2018. Using simulations with regional climate models show that losses observed GRACE missions are lower than any other two year period...
Significance Pine Island Glacier and Thwaites in the Amundsen Sea Embayment are among fastest changing outlet glaciers Antarctica. Yet, projecting future of these remains a major uncertainty for sea level rise. Here we use satellite imagery to show development damage areas with crevasses open fractures on ice shelves. These first signs their structural weakening as they precondition shelves disintegration. Model results that include mechanism highlight importance shelf stability, grounding...
Since 1992, there has been a revolution in our ability to quantify the land ice contribution sea level rise using variety of satellite missions and technologies. Each mission provided unique, but sometimes conflicting, insights into mass trends ice. Over last decade, over fifty estimates have published, providing confusing often inconsistent picture. The IPCC Fifth Assessment Report (AR5) attempted synthesise published up early 2013. then, considerable advances made understanding origin...
Surface mass balance (SMB) provides input to the surface of Antarctic and Greenland Ice Sheets therefore comprises an important control on ice sheet resulting contribution global sea level change. As SMB varies highly across multiple scales space (meters hundreds kilometers) time (hourly decadal), it is notoriously challenging observe represent in models. In addition, consists components, all which depend complex interactions between atmosphere snow/ice surface, large-scale atmospheric...
Increasingly rapid ice sheet melting Glaciers on the Southern Antarctic Peninsula have begun losing mass at a and accelerating rate. Wouters et al. documented dramatic thinning of land-based ice, which began in 2009, using satellite altimetry gravity observations. The weakening shelves reduce their buttressing effect, allowing glaciers to flow more quickly sea. Science , this issue p. 899
Glaciers outside of the ice sheets are known to be important contributors sea level rise. In this work, we provide an overview changes in mass world's glaciers, excluding those Greenland and Antarctica, between 2002 2016, based on satellite gravimetry observations Gravity Recovery Climate Experiment (GRACE). We find that over 14-yr period, glaciers lost about 3000 Gigatonnes mass, equivalent a contribution 8 mm. present annual balances for 17 individual regions, show qualitatively good...
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...
Continuous observations of temporal variations in the Earth's gravity field have recently become available at an unprecedented resolution a few hundreds kilometers. The is product mass distribution, and these data—provided by satellites Gravity Recovery And Climate Experiment (GRACE)—can be used to study exchange both within Earth its surface. Since launch mission 2002, GRACE data has evolved from being experimental measurement needing validation ground truth, respected tool for scientists...
Accurate quantification of the millennial-scale mass balance Greenland ice sheet (GrIS) and its contribution to global sea-level rise remain challenging because sparse in situ observations key regions. Glacial isostatic adjustment (GIA) is ongoing response solid Earth ocean load changes occurring since Last Maximum (LGM; ~21 thousand years ago) may be used constrain GrIS deglaciation history. We use data from Global Positioning System network directly measure GIA estimate basin-wide LGM....
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...