On the importance to consider the cloud dependence in parameterizing the albedo of snow on sea ice

Autor: L. Foth, W. Dorn, A. Rinke, E. Jäkel, H. Niehaus
Jazyk: angličtina
Rok vydání: 2024
Předmět:
Zdroj: The Cryosphere, Vol 18, Pp 4053-4064 (2024)
Druh dokumentu: article
ISSN: 1994-0416
1994-0424
DOI: 10.5194/tc-18-4053-2024
Popis: The impact of a slightly modified broadband snow surface albedo parameterization, which explicitly considers the cloud dependence of the snow albedo, is evaluated in simulations of a coupled regional climate model of the Arctic. The cloud dependence of the snow albedo leads to a more realistic simulation of the variability of the surface albedo during the snowmelt period in late May and June. In particular, the reproduction of lower albedo values under cloud-free/broken-cloud conditions during the snowmelt period represents an improvement and results in an earlier disappearance of the snow cover and an earlier onset of sea-ice melt. In this way, the consideration of the cloud dependence of the snow albedo results in an amplification of the two-stage snow/ice albedo feedback in the model. This finds expression in considerably increased sea-ice melt during the summer months and ends up in a new quasi-stationary equilibrium in sea ice with statistically significant lower sea-ice volume and statistically significant lower summer sea-ice area.
Databáze: Directory of Open Access Journals
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