Validation of ice thickness
Bulletin date: 2026-01-22
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 2026-01-22 | 0.448 | | -0.070 | | 0.180 |
| Week after 2026-01-22 | 0.473 | -0.060 | -0.060 | 0.190 | 0.180 |
| Accept frequency |
| Week | =0m | 0 - 0.3m | 0.3 - 0.6m | 0.6-1m | >1m |
| Week before 2026-01-22, BE |
0.155 |
0.803 |
0.773 |
0.848 |
0.694 |
| Week after 2026-01-22, FC |
0.058 |
0.843 |
0.782 |
0.837 |
0.717 |
| Week after 2026-01-22, BE |
0.055 |
0.857 |
0.81 |
0.869 |
0.754 |
| CryoSat-2, Sentinel 3A/B |
| Week | Avg. obs. | FC bias | BE bias | FC RMS | BE RMS |
|
| Week before 2026-01-22 | 1.347 | | -0.060 | | 0.210 |
|
| Week after 2026-01-22 | 1.439 | -0.080 | -0.080 | 0.210 | 0.190 |
|
| Accept frequency |
| Week | =0m | 0 - 1m | 1 - 1.5m | 1.5-2m | 2 - 2.5m | >2.5m |
| Week before 2026-01-22, BE |
0.048 |
0.915 |
0.957 |
0.946 |
0.919 |
1 |
| Week after 2026-01-22, FC |
0 |
0.867 |
0.936 |
0.907 |
0.883 |
0.996 |
| Week after 2026-01-22, BE |
0 |
0.896 |
0.951 |
0.928 |
0.916 |
1 |
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 2026-01-22, BE |
| =0m |
0 |
93 |
54 |
18 |
3 |
| 0 - 0.3m |
0 |
2987 |
1096 |
178 |
21 |
| 0.3 - 0.6m |
0 |
426 |
2342 |
825 |
34 |
| 0.6 - 1m |
0 |
0 |
252 |
1175 |
157 |
| >1m |
0 |
0 |
6 |
111 |
131 |
| Week after 2026-01-22, FC |
| =0m |
0 |
157 |
49 |
24 |
10 |
| 0 - 0.3m |
4 |
2862 |
883 |
158 |
21 |
| 0.3 - 0.6m |
0 |
466 |
2170 |
771 |
25 |
| 0.6 - 1m |
0 |
33 |
462 |
1488 |
117 |
| >1m |
0 |
0 |
6 |
232 |
282 |
| Week after 2026-01-22, BE |
| =0m |
0 |
95 |
40 |
20 |
10 |
| 0 - 0.3m |
4 |
2977 |
880 |
152 |
22 |
| 0.3 - 0.6m |
0 |
433 |
2236 |
709 |
23 |
| 0.6 - 1m |
0 |
11 |
410 |
1605 |
130 |
| >1m |
0 |
2 |
4 |
187 |
270 |
| CryoSat-2, Sentinel 3A/B |
Observed →
Modeled ↓ | =0m | 0 - 1m | 1 - 1.5m | 1.5-2m | 2 - 2.5m | >2.5m |
| Week before 2026-01-22, BE |
| =0m |
0 |
28 |
9 |
5 |
0 |
0 |
| 0 - 1m |
0 |
7400 |
1464 |
95 |
39 |
26 |
| 1 - 1.5m |
0 |
740 |
9169 |
660 |
31 |
19 |
| 1.5 - 2m |
0 |
0 |
546 |
5226 |
567 |
17 |
| 2 - 2.5m |
0 |
0 |
0 |
422 |
2252 |
477 |
| >2.5m |
0 |
0 |
0 |
0 |
12 |
370 |
| Week after 2026-01-22, FC |
| =0m |
0 |
33 |
11 |
3 |
1 |
0 |
| 0 - 1m |
0 |
6001 |
1939 |
98 |
10 |
20 |
| 1 - 1.5m |
0 |
644 |
8933 |
983 |
34 |
11 |
| 1.5 - 2m |
0 |
8 |
531 |
4718 |
878 |
12 |
| 2 - 2.5m |
0 |
1 |
0 |
450 |
2600 |
750 |
| >2.5m |
0 |
2 |
0 |
0 |
5 |
829 |
| Week after 2026-01-22, BE |
| =0m |
0 |
27 |
11 |
3 |
1 |
0 |
| 0 - 1m |
0 |
6144 |
1753 |
89 |
7 |
11 |
| 1 - 1.5m |
0 |
513 |
9288 |
959 |
30 |
16 |
| 1.5 - 2m |
0 |
2 |
362 |
4906 |
864 |
11 |
| 2 - 2.5m |
0 |
3 |
0 |
295 |
2612 |
658 |
| >2.5m |
0 |
0 |
0 |
0 |
14 |
926 |
Sea ice thickness maps
Statistics | Contingency tables | Maps
Week before 2026-01-22, model vs. merged CS3SMOS data
Week after 2026-01-22, model vs. merged CS3SMOS data
Week before 2026-01-22, model vs. SMOS data
Week after 2026-01-22, model vs. SMOS data
Week before 2026-01-22, model vs. altimetry data
Week after 2026-01-22, model vs. altimetry data
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