The map shows where on the Greenland Ice Sheet there has been melting over the previous day. This is defined as minimum 1 mm of melting at the surface. The curve under the map shows how large a percentage of the total area of the ice sheet has seen melting. The blue curve shows this year’s melt extent while the dark grey curve traces the mean value over the period 1981-2010. The light grey band shows differences from year to year. For any calendar day, the band shows the range over the 30 years (in the period 1981-2010), however with the lowest and highest values for each day omitted. Note, when comparing with the surface mass balance under ”Daily change”, that melting can occur without surface mass loss since the meltwater can refreeze in the underlying snow. Likewise, surface mass loss can occur without melting due to sublimation. PolarPortal

New research analyzes the spatial and temporal patterns of surface mass balance (SMB) and melt on the Greenland Ice Sheet (GrIS), exploring how atmospheric circulation and surface characteristics accelerate ice loss. The study aims to quantify the drivers of the ice sheet’s negative mass balance and understand the mechanisms behind its accelerating decline.

Drivers of Ice Loss

The analysis integrates satellite observations, regional climate models, and in situ measurements to track surface melt. A primary driver identified is the influence of large-scale atmospheric pressure systems and “atmospheric rivers“—narrow corridors of intense moisture and heat transport. These systems cause abrupt, extreme melt events, particularly along the western and southern margins of the ice sheet.

A critical finding is the role of surface albedo. As the ice sheet melts, the surface darkens due to the exposure of older, dustier ice and the formation of melt ponds. This reduction in reflectivity increases the absorption of solar radiation, which further accelerates melting—a self-amplifying feedback loop that significantly enhances the warming effects of the atmosphere.

The Albedo Feedback Loop

Expanding Vulnerability

The research notes a shift in melt distribution; while margins have traditionally been the most affected, melt is increasingly penetrating the high-altitude interior. This suggests the GrIS is becoming vulnerable across its entire extent, increasing the risk of non-linear responses to global warming.

Context from Recent Investigations

Recent data reinforces these trends while adding nuance to the role of atmospheric rivers. While they often exacerbate melt, some studies indicate they can also deliver massive snowfall events that temporarily offset mass loss; for instance, a March 2022 event offset Greenland’s annual ice loss by approximately 8%.

However, the overall trend remains negative, with the 2025 mass balance estimated at -129 ± 50 Gt. Furthermore, future projections under high-emission scenarios suggest extreme meltwater anomalies could increase by up to 372% by 2100.

Together, these findings underscore that current climate models may underestimate the speed of GrIS decline if localized extremes and dynamic albedo changes are not fully integrated.

References

1. Hanna, E., Box, J.E., Fettweis, X. et al. Past, present and future Greenland Ice Sheet surface melt, 1500–2200 CE. Nat Rev Earth Environ (2026). https://doi.org/10.1038/s43017-026-00800-3
2. Bonsoms, J., González-Herrero, S., Fettweis, X. et al. Record-breaking Greenland ice sheet melt events under recent and future climate. Nat Commun 17, 3605 (2026). https://doi.org/10.1038/s41467-026-69543-5
3. Atmospheric Rivers Help Restore Greenland Ice Sheet and Slow Sea Level Rise https://www.uarctic.org/news/2025/3/atmospheric-rivers-help-restore-greenland-ice-sheet-and-slow-sea-level-rise/
4. NOAA, Arctic Report Card 2025 https://arctic.noaa.gov/report-card/report-card-2025/greenland-ice-sheet-2025/
5. Greenland footage https://pixabay.com/users/cristian-manieri-42717454/?tab=videos&order=latest&pagi=1
6. Greenland melt ponds footage 2015 by Dark Snow Project

Related

• Massive calving episode in Greenland may foreshadow more rapid ice sheet loss https://phys.org/news/2026-07-massive-calving-episode-greenland-foreshadow.html
• Melt lakes on Greenland’s Glaciers https://earthclimate.eu/2015/08/31/melt-lakes-on-greenlands-glaciers/
• Exceptional 2012 Greenland Ice Melt Caused By Jet Stream Changes https://earthclimate.eu/2013/06/20/exceptional-2012-greenland-ice-melt-caused-by-jet-stream-changes-that-may-be-driven-by-global-warming/