Validation of ice thickness

Bulletin date: 2026-03-12

Model: ARC MFC - TOPAZ

Data source: CMEMS CS3SMOS

Validation statistics summary

Statistics | Contingency tables | Maps

SMOS
Week	Avg. obs.	FC bias	BE bias	FC RMS	BE RMS
Week before 2026-03-12	0.526		0.010		0.230
Week after 2026-03-12	0.499	0.060	0.040	0.240	0.220
	Accept frequency
Week	=0m	0 - 0.3m	0.3 - 0.6m	0.6-1m	>1m
Week before 2026-03-12, BE	0.091	0.865	0.829	0.748	0.673
Week after 2026-03-12, FC	0.126	0.901	0.801	0.683	0.572
Week after 2026-03-12, BE	0.094	0.905	0.837	0.753	0.651

CryoSat-2, Sentinel 3A/B
Week	Avg. obs.	FC bias	BE bias	FC RMS	BE RMS
Week before 2026-03-12	1.645		-0.080		0.250
Week after 2026-03-12	1.677	-0.130	-0.130	0.280	0.260
	Accept frequency
Week	=0m	0 - 1m	1 - 1.5m	1.5-2m	2 - 2.5m	>2.5m
Week before 2026-03-12, BE	0.03	0.876	0.937	0.87	0.956	0.893
Week after 2026-03-12, FC	0.021	0.863	0.883	0.833	0.823	0.951
Week after 2026-03-12, BE	0	0.871	0.905	0.869	0.849	0.972

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Sea ice thickness contingency tables

Statistics | Contingency tables | Maps

SMOS
Observed → Modeled ↓	=0m	0 - 0.3m	0.3 - 0.6m	0.6-1m	>1m
	Week before 2026-03-12, BE
=0m	0	122	75	20	2
0 - 0.3m	0	2928	736	170	32
0.3 - 0.6m	0	616	2112	599	43
0.6 - 1m	0	96	1331	2587	269
>1m	0	63	118	437	697
	Week after 2026-03-12, FC
=0m	2	97	54	11	3
0 - 0.3m	0	2369	521	112	28
0.3 - 0.6m	1	1024	2107	234	35
0.6 - 1m	1	219	1221	2030	260
>1m	0	26	81	619	544
	Week after 2026-03-12, BE
=0m	0	60	54	11	3
0 - 0.3m	2	2678	596	111	29
0.3 - 0.6m	2	872	2269	224	31
0.6 - 1m	0	123	1010	2137	259
>1m	0	2	55	523	548

CryoSat-2, Sentinel 3A/B
Observed → Modeled ↓	=0m	0 - 1m	1 - 1.5m	1.5-2m	2 - 2.5m	>2.5m
	Week before 2026-03-12, BE
=0m	0	21	7	3	2	0
0 - 1m	0	2785	821	147	37	13
1 - 1.5m	0	366	8190	2075	61	22
1.5 - 2m	0	17	356	5521	1654	36
2 - 2.5m	0	0	4	115	3395	560
>2.5m	0	0	0	10	333	1416
	Week after 2026-03-12, FC
=0m	0	31	9	7	0	0
0 - 1m	0	3393	1063	122	54	12
1 - 1.5m	0	441	6547	2370	208	31
1.5 - 2m	0	6	486	5215	2083	52
2 - 2.5m	0	0	12	183	2849	1380
>2.5m	0	0	0	0	212	1538
	Week after 2026-03-12, BE
=0m	0	29	7	7	0	0
0 - 1m	0	3503	1049	121	57	11
1 - 1.5m	0	334	6718	2208	148	26
1.5 - 2m	0	5	335	5403	1882	42
2 - 2.5m	0	0	8	158	3154	1336
>2.5m	0	0	0	0	165	1598

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Sea ice thickness maps

Statistics | Contingency tables | Maps

Week before 2026-03-12, model vs. merged CS3SMOS data

Week after 2026-03-12, model vs. merged CS3SMOS data

Week before 2026-03-12, model vs. SMOS data

Week after 2026-03-12, model vs. SMOS data

Week before 2026-03-12, model vs. altimetry data

Week after 2026-03-12, model vs. altimetry data

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