Validation of ice thickness

Bulletin date: 2025-10-23

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 2025-10-23	0.256		-0.020		0.250
Week after 2025-10-23	0.279	-0.050	-0.070	0.240	0.210
	Accept frequency
Week	=0m	0 - 0.3m	0.3 - 0.6m	0.6-1m	>1m
Week before 2025-10-23, BE	0.216	0.818	0.609	0.062	0.084
Week after 2025-10-23, FC	0.227	0.831	0.695	0.096	0.169
Week after 2025-10-23, BE	0.268	0.876	0.773	0.142	0.367

CryoSat-2, Sentinel 3A/B
Week	Avg. obs.	FC bias	BE bias	FC RMS	BE RMS
Week before 2025-10-23	1.224		-0.060		0.480
Week after 2025-10-23	1.270	-0.140	-0.130	0.510	0.390
	Accept frequency
Week	=0m	0 - 1m	1 - 1.5m	1.5-2m	2 - 2.5m	>2.5m
Week before 2025-10-23, BE	0.057	0.686	0.484	0.444	0.3	0.052
Week after 2025-10-23, FC	0.05	0.622	0.378	0.512	0.376	0.099
Week after 2025-10-23, BE	0.086	0.748	0.574	0.603	0.463	0.008

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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 2025-10-23, BE
=0m	2	760	137	12	0
0 - 0.3m	3	2537	869	31	1
0.3 - 0.6m	0	629	581	66	0
0.6 - 1m	0	288	180	12	1
>1m	0	60	26	17	4
	Week after 2025-10-23, FC
=0m	0	744	104	4	0
0 - 0.3m	0	3348	1110	40	3
0.3 - 0.6m	0	608	795	168	0
0.6 - 1m	0	293	252	7	1
>1m	0	35	16	16	4
	Week after 2025-10-23, BE
=0m	0	491	91	4	0
0 - 0.3m	0	3797	975	42	3
0.3 - 0.6m	0	524	1060	166	0
0.6 - 1m	0	206	148	10	1
>1m	0	10	3	13	4

CryoSat-2, Sentinel 3A/B
Observed → Modeled ↓	=0m	0 - 1m	1 - 1.5m	1.5-2m	2 - 2.5m	>2.5m
	Week before 2025-10-23, BE
=0m	0	32	3	0	0	0
0 - 1m	0	5653	3281	163	8	0
1 - 1.5m	0	598	1173	1177	228	0
1.5 - 2m	0	157	596	799	793	59
2 - 2.5m	0	36	347	866	265	6
>2.5m	0	1	463	104	186	14
	Week after 2025-10-23, FC
=0m	0	113	6	0	0	0
0 - 1m	0	5509	3546	829	24	0
1 - 1.5m	0	572	1110	1508	579	23
1.5 - 2m	0	145	491	959	652	107
2 - 2.5m	0	37	390	686	301	8
>2.5m	0	2	441	79	162	12
	Week after 2025-10-23, BE
=0m	0	67	3	0	0	0
0 - 1m	0	5864	2763	78	14	0
1 - 1.5m	0	365	2151	1971	147	0
1.5 - 2m	0	69	393	1478	972	126
2 - 2.5m	0	13	580	504	584	24
>2.5m	0	0	94	30	1	0

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Sea ice thickness maps

Statistics | Contingency tables | Maps

Week before 2025-10-23, model vs. merged CS3SMOS data

Week after 2025-10-23, model vs. merged CS3SMOS data

Week before 2025-10-23, model vs. SMOS data

Week after 2025-10-23, model vs. SMOS data

Week before 2025-10-23, model vs. altimetry data

Week after 2025-10-23, model vs. altimetry data

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