ORBi: How well do the regional atmospheric and oceanic models describe the Antarctic sea ice albedo? - 2025

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How well do the regional atmospheric and oceanic models describe the Antarctic sea ice albedo?

Verro, Kristiina; Äijälä, Cecilia; Pirazzini, Roberta et al.

2025 • In The Cryosphere, 19 (10), p. 4409-4436

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https://hdl.handle.net/2268/337403

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10.5194/tc-19-4409-2025

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Abstract :

[en] Abstract. We assessed how well regional climate models (HCLIM, MAR, RACMO), ocean models (MetROMS-UHel, NEMO), and ERA5 reanalysis simulate Antarctic sea ice albedo, snow, and ice thickness, using in situ data from field campaigns (ISPOL, Weddell Sea, in December 2004, and Marsden, McMurdo Sound, in November 2022) and satellite observations. The simulations performed were obtained with albedo parameterisations that greatly differed in complexity. While simple albedo parameterisations performed well in specific conditions applying ad hoc tuning (for instance, RACMO reproducing the Marsden albedo time series the most accurately), they struggled in simulating key processes. The most advanced albedo scheme applied in MetROMS-UHel produced the best overall results (including the diurnal albedo variability) when compared with ISPOL albedo time series and the observed albedo distribution from CLARA-A3 satellite products. In drier sea ice regions like the Ross Sea, the key issues affecting the accuracy of albedo models are the treatment of fractional snow cover and the snow albedo dependence on snow depth. Higher-resolution models do not necessarily outperform lower-resolution models if small-scale spatial variations in sea ice concentration, snow patchiness, and blowing snow are not accounted for. We believe that integrating the most sophisticated albedo schemes into regional climate or ocean models represents a major step forward in accurately simulating surface energy processes. Moreover, high-resolution topography and sea ice concentrations would be crucial to simulate complex coastal areas such as the Marsden campaign site.

Research Center/Unit :

SPHERES - ULiège

Disciplines :

Earth sciences & physical geography

Author, co-author :

Verro, Kristiina

Äijälä, Cecilia

Pirazzini, Roberta

Dadic, Ruzica

Maure, Damien ; Université de Liège - ULiège > Sphères

van de Berg, Willem Jan

Traversa, Giacomo

van Dalum, Christiaan T.

Uotila, Petteri

Fettweis, Xavier ; Université de Liège - ULiège > Département de géographie > Climatologie et Topoclimatologie

Di Mauro, Biagio

Johansson, Milla

Language :

English

Title :

How well do the regional atmospheric and oceanic models describe the Antarctic sea ice albedo?

Publication date :

09 October 2025

Journal title :

The Cryosphere

ISSN :

1994-0416

eISSN :

1994-0424

Publisher :

Copernicus

Volume :

19

Issue :

10

Pages :

4409-4436

Peer reviewed :

Peer Reviewed verified by ORBi

Tags :

CÉCI : Consortium des Équipements de Calcul Intensif
Tier-1 supercalculateur

Additional URL :

https://tc.copernicus.org/articles/19/4409/2025/tc-19-4409-2025.pdf

European Projects :

H2020 - 101003590 - PolarRES - Polar Regions in the Earth System

Funders :

European Union

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since 10 November 2025

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