Validation of ice thickness

Bulletin date: 2026-03-26

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 2026-03-26	0.500		0.060		0.240
Week after 2026-03-26	0.488	0.070	0.050	0.250	0.230
	Accept frequency
Week	=0m	0 - 0.3m	0.3 - 0.6m	0.6-1m	>1m
Week before 2026-03-26, BE	0.143	0.916	0.837	0.716	0.68
Week after 2026-03-26, FC	0.079	0.902	0.724	0.696	0.616
Week after 2026-03-26, BE	0.093	0.919	0.788	0.735	0.662

CryoSat-2, Sentinel 3A/B
Week	Avg. obs.	FC bias	BE bias	FC RMS	BE RMS
Week before 2026-03-26	1.774		-0.120		0.250
Week after 2026-03-26	1.791	-0.150	-0.140	0.300	0.280
	Accept frequency
Week	=0m	0 - 1m	1 - 1.5m	1.5-2m	2 - 2.5m	>2.5m
Week before 2026-03-26, BE	0	0.91	0.91	0.893	0.809	0.997
Week after 2026-03-26, FC	0	0.732	0.882	0.858	0.813	0.984
Week after 2026-03-26, BE	0	0.742	0.915	0.905	0.865	0.989

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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 2026-03-26, BE
=0m	0	101	54	22	5
0 - 0.3m	0	3034	578	138	34
0.3 - 0.6m	0	1211	2211	278	45
0.6 - 1m	0	146	1239	1884	153
>1m	0	23	93	708	903
	Week after 2026-03-26, FC
=0m	1	50	42	19	2
0 - 0.3m	0	2708	417	133	37
0.3 - 0.6m	0	1508	1976	405	28
0.6 - 1m	0	116	1247	1521	206
>1m	0	55	136	662	706
	Week after 2026-03-26, BE
=0m	1	54	42	19	2
0 - 0.3m	0	3051	408	127	34
0.3 - 0.6m	0	1193	2125	404	27
0.6 - 1m	0	94	1150	1604	212
>1m	0	45	93	586	704

CryoSat-2, Sentinel 3A/B
Observed → Modeled ↓	=0m	0 - 1m	1 - 1.5m	1.5-2m	2 - 2.5m	>2.5m
	Week before 2026-03-26, BE
=0m	0	18	11	2	0	0
0 - 1m	0	2896	816	74	35	12
1 - 1.5m	0	429	5717	1929	40	15
1.5 - 2m	0	11	311	6037	1917	63
2 - 2.5m	0	0	16	179	3549	1793
>2.5m	0	0	0	2	76	2308
	Week after 2026-03-26, FC
=0m	0	38	15	19	1	1
0 - 1m	0	2721	2067	245	51	10
1 - 1.5m	0	300	4790	2350	74	12
1.5 - 2m	0	57	537	5436	2076	21
2 - 2.5m	0	0	17	258	3153	1842
>2.5m	0	0	1	5	181	2981
	Week after 2026-03-26, BE
=0m	0	24	12	14	1	1
0 - 1m	0	2765	2054	221	49	10
1 - 1.5m	0	315	4893	2045	65	9
1.5 - 2m	0	12	457	5784	1737	16
2 - 2.5m	0	0	11	249	3539	1593
>2.5m	0	0	0	0	145	3238

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Sea ice thickness maps

Statistics | Contingency tables | Maps

Week before 2026-03-26, model vs. merged CS3SMOS data

Week after 2026-03-26, model vs. merged CS3SMOS data

Week before 2026-03-26, model vs. SMOS data

Week after 2026-03-26, model vs. SMOS data

Week before 2026-03-26, model vs. altimetry data

Week after 2026-03-26, model vs. altimetry data

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