Validation of sea ice concentration - Full domain
Bulletin date: 2025-10-30
Data source: OSI SAF N.H. AMSR sea ice concentration
Model vs. observations, sea ice class contingency tables
Date: 2025-10-24:
| Best estimate |
Forecast |
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
103334 |
10973 |
642 |
1043 |
270 |
20 |
0 |
0 |
| OW |
1460 |
562 |
340 |
1071 |
761 |
276 |
3 |
0 |
| VODI |
2656 |
155 |
80 |
861 |
1337 |
809 |
39 |
0 |
| ODI |
0 |
31 |
41 |
181 |
1101 |
843 |
160 |
0 |
| CDI |
0 |
1 |
10 |
92 |
1021 |
2144 |
840 |
0 |
| VCDI |
0 |
0 |
0 |
4 |
217 |
9744 |
24137 |
13551 |
|
...date precedes bulletin
|
Date: 2025-10-26:
| Best estimate |
Forecast |
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
102569 |
10536 |
593 |
823 |
177 |
8 |
0 |
0 |
| OW |
1425 |
529 |
350 |
1004 |
644 |
62 |
13 |
0 |
| VODI |
2706 |
140 |
117 |
786 |
1386 |
431 |
34 |
0 |
| ODI |
0 |
16 |
22 |
223 |
1376 |
971 |
69 |
0 |
| CDI |
0 |
2 |
0 |
58 |
639 |
2551 |
735 |
0 |
| VCDI |
0 |
6 |
7 |
25 |
255 |
8566 |
31306 |
9650 |
|
...date precedes bulletin
|
Date: 2025-10-28:
| Best estimate |
Forecast |
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
102751 |
9133 |
398 |
453 |
86 |
0 |
0 |
0 |
| OW |
1387 |
495 |
365 |
880 |
359 |
28 |
0 |
0 |
| VODI |
2754 |
69 |
104 |
858 |
1674 |
410 |
8 |
0 |
| ODI |
0 |
2 |
11 |
136 |
1206 |
1516 |
185 |
0 |
| CDI |
0 |
0 |
0 |
27 |
598 |
2724 |
913 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
57 |
7746 |
33645 |
9832 |
|
...date precedes bulletin
|
Date: 2025-10-30:
| Best estimate |
Forecast |
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
100414 |
10509 |
374 |
424 |
152 |
19 |
0 |
0 |
| OW |
1331 |
675 |
233 |
548 |
238 |
41 |
0 |
0 |
| VODI |
2805 |
188 |
214 |
641 |
758 |
550 |
100 |
0 |
| ODI |
0 |
15 |
24 |
225 |
700 |
1709 |
201 |
0 |
| CDI |
0 |
2 |
4 |
52 |
413 |
2141 |
886 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
74 |
7066 |
29984 |
17100 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
100413 |
10539 |
373 |
456 |
173 |
22 |
0 |
0 |
| OW |
1325 |
603 |
221 |
454 |
223 |
36 |
0 |
0 |
| VODI |
2812 |
231 |
225 |
671 |
673 |
515 |
117 |
0 |
| ODI |
0 |
13 |
26 |
259 |
726 |
1624 |
227 |
0 |
| CDI |
0 |
3 |
4 |
50 |
461 |
2195 |
803 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
79 |
7134 |
30024 |
17100 |
|
Date: 2025-11-01:
| Best estimate |
Forecast |
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
98224 |
11707 |
550 |
386 |
54 |
1 |
0 |
0 |
| OW |
1336 |
1154 |
356 |
497 |
152 |
19 |
1 |
0 |
| VODI |
2838 |
312 |
162 |
581 |
525 |
203 |
99 |
0 |
| ODI |
0 |
68 |
61 |
367 |
584 |
791 |
485 |
0 |
| CDI |
0 |
15 |
29 |
177 |
645 |
1508 |
1144 |
3 |
| VCDI |
0 |
0 |
0 |
6 |
155 |
4384 |
27073 |
24158 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
98179 |
11787 |
572 |
434 |
80 |
6 |
0 |
0 |
| OW |
1380 |
1045 |
329 |
474 |
169 |
22 |
1 |
0 |
| VODI |
2839 |
327 |
158 |
544 |
452 |
186 |
63 |
0 |
| ODI |
0 |
80 |
67 |
356 |
584 |
698 |
461 |
0 |
| CDI |
0 |
17 |
29 |
188 |
660 |
1506 |
1206 |
3 |
| VCDI |
0 |
0 |
3 |
18 |
170 |
4488 |
27071 |
24158 |
|
Date: 2025-11-03:
| Best estimate |
Forecast |
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
99344 |
10713 |
310 |
396 |
37 |
0 |
0 |
0 |
| OW |
1281 |
1212 |
418 |
630 |
149 |
1 |
0 |
0 |
| VODI |
2981 |
63 |
108 |
701 |
577 |
52 |
0 |
0 |
| ODI |
0 |
8 |
17 |
124 |
1094 |
329 |
215 |
5 |
| CDI |
0 |
2 |
5 |
47 |
616 |
1524 |
627 |
106 |
| VCDI |
0 |
0 |
0 |
4 |
150 |
5496 |
29081 |
22387 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
99310 |
10445 |
362 |
656 |
112 |
1 |
0 |
0 |
| OW |
1306 |
1019 |
224 |
445 |
302 |
30 |
0 |
0 |
| VODI |
2990 |
339 |
159 |
369 |
502 |
150 |
4 |
0 |
| ODI |
0 |
107 |
63 |
234 |
668 |
290 |
359 |
1 |
| CDI |
0 |
48 |
35 |
152 |
711 |
1064 |
1097 |
19 |
| VCDI |
0 |
40 |
15 |
46 |
328 |
5867 |
28463 |
22478 |
|
Date: 2025-11-05:
| Best estimate |
Forecast |
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
97924 |
11295 |
400 |
532 |
131 |
0 |
0 |
0 |
| OW |
1252 |
941 |
369 |
709 |
411 |
9 |
0 |
0 |
| VODI |
3006 |
126 |
151 |
492 |
689 |
115 |
1 |
0 |
| ODI |
0 |
22 |
40 |
256 |
513 |
267 |
8 |
4 |
| CDI |
0 |
14 |
19 |
93 |
594 |
1302 |
149 |
26 |
| VCDI |
0 |
1 |
3 |
20 |
307 |
6777 |
26359 |
25483 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
97868 |
10618 |
429 |
567 |
218 |
9 |
0 |
0 |
| OW |
1313 |
1313 |
261 |
555 |
413 |
45 |
0 |
0 |
| VODI |
3001 |
365 |
197 |
519 |
599 |
176 |
4 |
0 |
| ODI |
0 |
59 |
54 |
262 |
507 |
341 |
150 |
11 |
| CDI |
0 |
41 |
34 |
165 |
602 |
1167 |
724 |
49 |
| VCDI |
0 |
3 |
7 |
34 |
306 |
6732 |
25639 |
25453 |
|
Date: 2025-11-07:
| Best estimate |
Forecast |
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
94301 |
12594 |
471 |
615 |
92 |
4 |
0 |
0 |
| OW |
1294 |
1259 |
327 |
978 |
532 |
109 |
0 |
0 |
| VODI |
3026 |
221 |
163 |
517 |
781 |
230 |
3 |
0 |
| ODI |
0 |
20 |
60 |
279 |
511 |
422 |
31 |
0 |
| CDI |
0 |
3 |
11 |
134 |
549 |
1177 |
316 |
0 |
| VCDI |
0 |
1 |
2 |
25 |
463 |
4308 |
29423 |
25558 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
94249 |
11750 |
415 |
640 |
153 |
31 |
0 |
0 |
| OW |
1347 |
1829 |
349 |
817 |
429 |
136 |
5 |
0 |
| VODI |
3025 |
440 |
190 |
706 |
852 |
351 |
52 |
0 |
| ODI |
0 |
44 |
50 |
225 |
620 |
368 |
125 |
0 |
| CDI |
0 |
28 |
22 |
107 |
441 |
998 |
830 |
115 |
| VCDI |
0 |
7 |
8 |
53 |
433 |
4366 |
28761 |
25443 |
|
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