Validation of ice thickness

Bulletin date: 2026-04-09

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 2026-04-09	0.491		0.070		0.270
Week after 2026-04-09	0.555	0.110	0.080	0.310	0.270
	Accept frequency
Week	=0m	0 - 0.3m	0.3 - 0.6m	0.6-1m	>1m
Week before 2026-04-09, BE	0.074	0.86	0.808	0.671	0.563
Week after 2026-04-09, FC	0.084	0.872	0.681	0.653	0.618
Week after 2026-04-09, BE	0.092	0.906	0.786	0.694	0.704

CryoSat-2, Sentinel 3A/B
Week	Avg. obs.	FC bias	BE bias	FC RMS	BE RMS
Week before 2026-04-09	1.809		-0.120		0.280
Week after 2026-04-09	1.855	-0.120	-0.100	0.300	0.270
	Accept frequency
Week	=0m	0 - 1m	1 - 1.5m	1.5-2m	2 - 2.5m	>2.5m
Week before 2026-04-09, BE	0	0.798	0.863	0.887	0.875	0.987
Week after 2026-04-09, FC	0.033	0.748	0.791	0.851	0.881	0.929
Week after 2026-04-09, BE	0.094	0.791	0.882	0.922	0.932	0.948

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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 2026-04-09, BE
=0m	0	61	41	13	6
0 - 0.3m	0	2643	733	137	42
0.3 - 0.6m	0	1115	2128	298	38
0.6 - 1m	0	323	1515	1729	161
>1m	0	79	218	727	654
	Week after 2026-04-09, FC
=0m	0	56	43	11	9
0 - 0.3m	0	2248	708	129	59
0.3 - 0.6m	0	1347	1378	219	54
0.6 - 1m	0	219	1741	1867	184
>1m	0	93	303	1272	1298
	Week after 2026-04-09, BE
=0m	0	58	41	12	9
0 - 0.3m	0	2564	563	131	56
0.3 - 0.6m	0	1085	1830	289	48
0.6 - 1m	0	221	1597	2059	212
>1m	0	35	142	1007	1279

CryoSat-2, Sentinel 3A/B
Observed → Modeled ↓	=0m	0 - 1m	1 - 1.5m	1.5-2m	2 - 2.5m	>2.5m
	Week before 2026-04-09, BE
=0m	0	40	11	10	1	2
0 - 1m	0	3114	1483	175	77	16
1 - 1.5m	0	602	4404	1861	40	21
1.5 - 2m	0	9	616	5531	1468	43
2 - 2.5m	0	1	23	262	3919	1266
>2.5m	0	0	1	0	203	3635
	Week after 2026-04-09, FC
=0m	0	10	15	4	1	0
0 - 1m	0	2184	1382	224	60	7
1 - 1.5m	0	433	3603	2316	75	39
1.5 - 2m	0	18	743	5285	1768	70
2 - 2.5m	0	0	2	351	3803	914
>2.5m	0	0	0	2	619	3483
	Week after 2026-04-09, BE
=0m	0	12	15	4	1	0
0 - 1m	0	2315	1281	194	56	5
1 - 1.5m	0	315	3895	1754	58	16
1.5 - 2m	0	3	554	5969	1224	69
2 - 2.5m	0	0	0	259	4487	739
>2.5m	0	0	0	2	500	3684

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Sea ice thickness maps

Statistics | Contingency tables | Maps

Week before 2026-04-09, model vs. merged CS3SMOS data

Week after 2026-04-09, model vs. merged CS3SMOS data

Week before 2026-04-09, model vs. SMOS data

Week after 2026-04-09, model vs. SMOS data

Week before 2026-04-09, model vs. altimetry data

Week after 2026-04-09, model vs. altimetry data

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