Greenland Ice Sheet Faces Accelerated Melting Due to Firn 'Sponginess'

New study reveals that warming temperatures deplete firn's ability to store meltwater more than cooling can restore it.

Researchers used the SNOWPACK model to study temperature impacts on Greenland's firn layer.
Firn covers 90% of the Greenland Ice Sheet and acts as a buffer against sea level rise.
Warming reduces firn's 'sponginess,' leading to faster ice sheet mass loss.
Cooling temperatures do not fully restore firn's capacity to store meltwater.
The findings challenge the effectiveness of geoengineering solutions to reverse Arctic ice loss.