#IMC: September 14 - 18 2025

Estimating snow sublimation using stable water isotopes and eddy-covariance measurements in the Swiss Alps

Assigned Session: FS 3.118: Integrating cryosphere-atmosphere-hydrosphere dynamics: from process-level insights to large-scale modeling

Abstract ID: 3.13997 | Accepted as Poster | Poster | TBA | TBA

Isabella Anglin (0)
Beria, Harsh (1,3), Teuling, Ryan (2), Floriancic, Marius (3), Lehning, Michael (1,4)
Isabella Anglin (1,2)
Beria, Harsh (1,3), Teuling, Ryan (2), Floriancic, Marius (3), Lehning, Michael (1,4)

1,2
(1) WSL Institute for Snow and Avalanche Research SLF, Flüelastrasse, 7260, Davos, Switzerland
(2) Hydrology and Environmental Hydraulics (HWM) Group at Wageningen University, Droevendaalsesteeg, 6708PB, Wageningen, the Netherlands
(3) Department of Civil, Environmental and Geomatic Engineering, ETH Zurich, Stefano-Franscini-Platz, 8093, Zurich, Switzerland
(4) Laboratory of Cryospheric Sciences, Ecole polytechnique federale de Lausanne (EPFL), Route des Ronquos, 1950, Sion, Switzerland

(1) WSL Institute for Snow and Avalanche Research SLF, Flüelastrasse, 7260, Davos, Switzerland
(2) Hydrology and Environmental Hydraulics (HWM) Group at Wageningen University, Droevendaalsesteeg, 6708PB, Wageningen, the Netherlands
(3) Department of Civil, Environmental and Geomatic Engineering, ETH Zurich, Stefano-Franscini-Platz, 8093, Zurich, Switzerland
(4) Laboratory of Cryospheric Sciences, Ecole polytechnique federale de Lausanne (EPFL), Route des Ronquos, 1950, Sion, Switzerland

Categories: Cryo- & Hydrosphere
Keywords: Sublimation, Stable water isotopes, Latent heat fluxes

Categories: Cryo- & Hydrosphere
Keywords: Sublimation, Stable water isotopes, Latent heat fluxes

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Snow sublimation remains poorly quantified in the high-elevation European Alps, creating significant uncertainties in snow ablation partitioning. Specifically, the balance between sublimation losses to the atmosphere and snowmelt infiltration into the subsurface remains unclear. Accurately constraining this partitioning is essential for effective water management in downstream basins.

Here, we present snow sublimation estimates at three alpine sites in Davos, Switzerland, using eddy covariance-derived latent heat fluxes and stable water isotope (δ¹⁸O and δ²H) measurements from snow surface samples during the 2025 winter. These sites offer unique accessibility, enabling high-temporal-resolution snowpack sampling, from sub-diurnal to weekly time scales. This study improves our understanding of sublimation in the Alps by assessing to what extent fractionation patterns in stable water isotopes of surface snowpack can serve as a reliable proxy for estimating snow sublimation.

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