Validation of ice thickness

Bulletin date: 2026-02-12

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 2026-02-12	0.484		-0.030		0.190
Week after 2026-02-12	0.443	-0.030	-0.040	0.190	0.180
	Accept frequency
Week	=0m	0 - 0.3m	0.3 - 0.6m	0.6-1m	>1m
Week before 2026-02-12, BE	0.263	0.868	0.805	0.84	0.699
Week after 2026-02-12, FC	0.113	0.842	0.848	0.832	0.483
Week after 2026-02-12, BE	0.122	0.852	0.865	0.849	0.51

CryoSat-2, Sentinel 3A/B
Week	Avg. obs.	FC bias	BE bias	FC RMS	BE RMS
Week before 2026-02-12	1.436		-0.050		0.190
Week after 2026-02-12	1.393	-0.040	-0.050	0.230	0.210
	Accept frequency
Week	=0m	0 - 1m	1 - 1.5m	1.5-2m	2 - 2.5m	>2.5m
Week before 2026-02-12, BE	0.133	0.888	0.962	0.944	0.933	0.995
Week after 2026-02-12, FC	0.057	0.918	0.952	0.916	0.887	0.864
Week after 2026-02-12, BE	0.062	0.928	0.966	0.958	0.926	0.896

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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 2026-02-12, BE
=0m	0	95	29	25	7
0 - 0.3m	0	3007	665	184	30
0.3 - 0.6m	0	438	2203	681	42
0.6 - 1m	0	11	590	1979	184
>1m	0	0	15	203	284
	Week after 2026-02-12, FC
=0m	0	56	23	16	2
0 - 0.3m	2	1556	573	131	18
0.3 - 0.6m	0	344	1364	272	10
0.6 - 1m	0	1	367	1031	45
>1m	0	0	0	37	23
	Week after 2026-02-12, BE
=0m	0	32	24	16	2
0 - 0.3m	2	1651	593	135	18
0.3 - 0.6m	0	273	1379	277	11
0.6 - 1m	0	1	331	1028	47
>1m	0	0	0	31	20

CryoSat-2, Sentinel 3A/B
Observed → Modeled ↓	=0m	0 - 1m	1 - 1.5m	1.5-2m	2 - 2.5m	>2.5m
	Week before 2026-02-12, BE
=0m	0	18	8	4	0	0
0 - 1m	0	5554	1620	95	16	7
1 - 1.5m	0	543	9906	1070	17	6
1.5 - 2m	0	34	723	5030	453	11
2 - 2.5m	0	0	0	447	2631	293
>2.5m	0	0	0	0	101	1220
	Week after 2026-02-12, FC
=0m	0	53	14	3	0	0
0 - 1m	0	7703	2023	102	23	10
1 - 1.5m	0	1020	10309	910	18	9
1.5 - 2m	0	42	1041	5528	339	7
2 - 2.5m	0	2	15	756	2427	296
>2.5m	0	0	0	0	379	1257
	Week after 2026-02-12, BE
=0m	0	48	14	3	0	0
0 - 1m	0	7900	1884	95	19	10
1 - 1.5m	0	843	10823	858	19	8
1.5 - 2m	0	29	677	5737	257	4
2 - 2.5m	0	0	4	606	2588	248
>2.5m	0	0	0	0	303	1309

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Sea ice thickness maps

Statistics | Contingency tables | Maps

Week before 2026-02-12, model vs. merged CS3SMOS data

Week after 2026-02-12, model vs. merged CS3SMOS data

Week before 2026-02-12, model vs. SMOS data

Week after 2026-02-12, model vs. SMOS data

Week before 2026-02-12, model vs. altimetry data

Week after 2026-02-12, model vs. altimetry data

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