Articles | Volume 20, issue 10
https://doi.org/10.5194/tc-20-5653-2026
https://doi.org/10.5194/tc-20-5653-2026
Research article
 | 
05 Oct 2026
Research article |  | 05 Oct 2026

Seasonal evolution of suncup roughness describes broadband albedo decay on alpine snow

Francesca Carletti, Nora Helbig, Nander Wever, Loïc Brouet, Mathias Bavay, Benjamin Walter, and Michael Lehning

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Short summary
Melting alpine snowfields develop cup-shaped hollows that reduce how much sunlight the snow reflects, accelerating melt. Over three seasons in the Swiss Alps, we monitored how these hollows form and grow with a laser scanner. Two processes reduce reflectivity at the same time: hollows trap light through internal reflections, and meltwater washes dark particles into them. Because they are difficult to separate, surface roughness alone emerges as a proxy for overall reflectivity loss.
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