Water Science and Technology; Earth-Surface Processes
Abstract :
[en] In recent decades, satellite radar altimetry has been widely used to assess volume changes over the Greenland Ice Sheet. In particular, melt events result in drastic changes in the volume scattering of firn, which induces a pronounced change in the parameters derived from radar altimeter data. Due to the recent and increasingly frequent melt events over Greenland, the impacts of these events on the firn condition, i.e. the formation of ice lenses and reduction in firn air content, need to be better understood. This study therefore exploits the ability of long-term CryoSat-2 data to indicate changes in firn volume scattering in order to assess the spatiotemporal firn condition variations in Greenland. More specifically, this study utilises the leading edge width (LeW) parameter derived from CryoSat-2 Low Resolution Mode data, which has been proven to be a parameter strongly sensitive to changes in volume scattering, and assesses its variation between September 2010 and September 2024. With a combined analysis of remote sensing observations, in situ observations, and outputs from regional climate models, our study demonstrates that the LeW drop induced by extreme melt events in the interior of Greenland experiences a gradual recovery, which can potentially be explained by new-snow deposition. However, in many high-elevation regions of Greenland where firn layers were originally dry, the recent recurrence of extensive melt has prevented a full recovery of the firn volume scattering to pre-2012 conditions, indicating a persistent increase in firn density under a changing climate. Finally, our study also confirms the utility of radar altimeter data for long-term monitoring of the impact of melt and refreezing events on the properties of the upper firn layer.
Research Center/Unit :
SPHERES - ULiège
Disciplines :
Earth sciences & physical geography
Author, co-author :
Li, Weiran; Department of Geoscience and Remote Sensing, Delft University of Technology, Delft, Netherlands
Lhermitte, Stef ; Department of Geoscience and Remote Sensing, Delft University of Technology, Delft, Netherlands ; Department of Earth & Environmental Sciences, KU Leuven, Leuven, Belgium
Wouters, Bert; Department of Geoscience and Remote Sensing, Delft University of Technology, Delft, Netherlands
Slobbe, Cornelis ; Department of Geoscience and Remote Sensing, Delft University of Technology, Delft, Netherlands
Brils, Max ; Institute for Marine and Atmospheric Research, Utrecht University, Utrecht, Netherlands ; Department of Geography and Environmental Sciences, Northumbria University, Newcastle upon Tyne, United Kingdom
Fettweis, Xavier ; Université de Liège - ULiège > Département de géographie > Climatologie et Topoclimatologie
Language :
English
Title :
Assessing spatiotemporal variability in melt-refreeze patterns in firn over Greenland with CryoSat-2
Publication date :
September 2025
Journal title :
The Cryosphere
ISSN :
1994-0416
eISSN :
1994-0424
Publisher :
Copernicus Publications
Volume :
19
Issue :
9
Pages :
3419 - 3442
Peer reviewed :
Peer Reviewed verified by ORBi
Tags :
CÉCI : Consortium des Équipements de Calcul Intensif
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