Validation of ice thickness

Bulletin date: 2026-03-05

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 2026-03-05	0.544		-0.010		0.250
Week after 2026-03-05	0.526	0.030	0.010	0.250	0.230
	Accept frequency
Week	=0m	0 - 0.3m	0.3 - 0.6m	0.6-1m	>1m
Week before 2026-03-05, BE	0.111	0.763	0.828	0.772	0.651
Week after 2026-03-05, FC	0.102	0.865	0.796	0.706	0.63
Week after 2026-03-05, BE	0.091	0.865	0.829	0.748	0.673

CryoSat-2, Sentinel 3A/B
Week	Avg. obs.	FC bias	BE bias	FC RMS	BE RMS
Week before 2026-03-05	1.579		-0.060		0.230
Week after 2026-03-05	1.645	-0.080	-0.080	0.270	0.250
	Accept frequency
Week	=0m	0 - 1m	1 - 1.5m	1.5-2m	2 - 2.5m	>2.5m
Week before 2026-03-05, BE	0	0.884	0.938	0.892	0.931	0.932
Week after 2026-03-05, FC	0.03	0.859	0.919	0.81	0.925	0.88
Week after 2026-03-05, BE	0.03	0.876	0.937	0.87	0.956	0.893

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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 2026-03-05, BE
=0m	1	109	48	30	1
0 - 0.3m	0	2143	919	233	47
0.3 - 0.6m	0	455	1871	585	30
0.6 - 1m	0	220	1035	2517	189
>1m	0	28	111	403	593
	Week after 2026-03-05, FC
=0m	0	142	79	23	2
0 - 0.3m	0	2750	666	169	32
0.3 - 0.6m	0	723	1989	610	39
0.6 - 1m	0	140	1484	2462	263
>1m	0	70	154	549	707
	Week after 2026-03-05, 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

CryoSat-2, Sentinel 3A/B
Observed → Modeled ↓	=0m	0 - 1m	1 - 1.5m	1.5-2m	2 - 2.5m	>2.5m
	Week before 2026-03-05, BE
=0m	0	16	6	5	2	0
0 - 1m	0	3177	1134	90	36	17
1 - 1.5m	0	689	9607	1879	51	13
1.5 - 2m	0	7	479	5552	1307	46
2 - 2.5m	0	0	0	127	2893	453
>2.5m	0	0	0	0	413	1419
	Week after 2026-03-05, FC
=0m	0	21	7	3	2	0
0 - 1m	0	2711	853	158	44	13
1 - 1.5m	0	437	7984	2232	80	21
1.5 - 2m	0	20	527	5319	2070	63
2 - 2.5m	0	0	7	147	2911	586
>2.5m	0	0	0	12	375	1364
	Week after 2026-03-05, 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

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Sea ice thickness maps

Statistics | Contingency tables | Maps

Week before 2026-03-05, model vs. merged CS3SMOS data

Week after 2026-03-05, model vs. merged CS3SMOS data

Week before 2026-03-05, model vs. SMOS data

Week after 2026-03-05, model vs. SMOS data

Week before 2026-03-05, model vs. altimetry data

Week after 2026-03-05, model vs. altimetry data

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