Validation of ice thickness

Bulletin date: 2026-04-02

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 2026-04-02	0.488		0.050		0.230
Week after 2026-04-02	0.491	0.070	0.070	0.270	0.270
	Accept frequency
Week	=0m	0 - 0.3m	0.3 - 0.6m	0.6-1m	>1m
Week before 2026-04-02, BE	0.093	0.919	0.788	0.735	0.662
Week after 2026-04-02, FC	0.078	0.853	0.804	0.673	0.559
Week after 2026-04-02, BE	0.074	0.86	0.808	0.671	0.563

CryoSat-2, Sentinel 3A/B
Week	Avg. obs.	FC bias	BE bias	FC RMS	BE RMS
Week before 2026-04-02	1.791		-0.140		0.280
Week after 2026-04-02	1.809	-0.120	-0.120	0.280	0.280
	Accept frequency
Week	=0m	0 - 1m	1 - 1.5m	1.5-2m	2 - 2.5m	>2.5m
Week before 2026-04-02, BE	0	0.742	0.915	0.905	0.865	0.989
Week after 2026-04-02, FC	0	0.797	0.863	0.885	0.878	0.985
Week after 2026-04-02, BE	0	0.798	0.863	0.887	0.875	0.987

---

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 2026-04-02, 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
	Week after 2026-04-02, FC
=0m	0	53	43	13	7
0 - 0.3m	0	2656	751	142	41
0.3 - 0.6m	0	1132	2092	303	43
0.6 - 1m	0	301	1531	1706	152
>1m	0	79	218	740	658
	Week after 2026-04-02, 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

CryoSat-2, Sentinel 3A/B
Observed → Modeled ↓	=0m	0 - 1m	1 - 1.5m	1.5-2m	2 - 2.5m	>2.5m
	Week before 2026-04-02, 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
	Week after 2026-04-02, FC
=0m	0	50	10	12	1	2
0 - 1m	0	3096	1474	178	77	17
1 - 1.5m	0	611	4398	1854	41	19
1.5 - 2m	0	8	632	5539	1476	45
2 - 2.5m	0	1	23	255	3900	1240
>2.5m	0	0	1	1	213	3660
	Week after 2026-04-02, 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

---

Sea ice thickness maps

Statistics | Contingency tables | Maps

Week before 2026-04-02, model vs. merged CS3SMOS data

Week after 2026-04-02, model vs. merged CS3SMOS data

Week before 2026-04-02, model vs. SMOS data

Week after 2026-04-02, model vs. SMOS data

Week before 2026-04-02, model vs. altimetry data

Week after 2026-04-02, model vs. altimetry data

---

Generated by /metno/routine/sms/V3/SIthicknessValidation5/SITwebPage5.sh Fri Apr 17 04:29:58 UTC 2026 on arcval2

---