Retrieving frozen ground surface temperature under the snowpack in the Arctic permafrost area from SMOS observations. - Ortet, Juliette; Mialon, Arnaud; Royer, Alain; Schwank, Mike; Holmberg, Manu; Rautiainen, Kimmo; Bircher-Adrot, Simone; Colliander, Andreas; Kerr, Yann; Roy, Alexandre (Cryosphere, 2025)