NOW (PID2021-124220OB-100), both funded by the Spanish Ministry of Science and Innovation.

*Financial support.* This research has been supported by the Norges Forskningsråd (grant nos. JASPER 337515, SNOWDEPTH 325519, and Spot-On 301552), the Centre National d'Etudes Spatiales (grant no. Postdoctoral fellowship 0103207), and the Ministerio de Ciencia e Innovación (grant nos. MARGISNOW PID2021-124220OB-100 and SNOWDUST TED2021-130114B-I00).

*Review statement.* This paper was edited by Jan Seibert and reviewed by two anonymous referees.

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