Validation of sea ice concentration
Bulletin date: 2025-04-10
Model vs. observations, sea ice class contingency tables
Date: 2025-04-04:
| 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 |
56634 |
24199 |
2744 |
568 |
166 |
105 |
13 |
0 |
| OW |
0 |
964 |
1307 |
905 |
634 |
321 |
31 |
0 |
| VODI |
0 |
341 |
818 |
836 |
838 |
1062 |
230 |
0 |
| ODI |
0 |
29 |
392 |
564 |
470 |
1357 |
632 |
52 |
| CDI |
0 |
9 |
270 |
684 |
614 |
1757 |
6311 |
248 |
| VCDI |
0 |
0 |
111 |
222 |
224 |
496 |
24199 |
27487 |
|
...date precedes bulletin
|
Date: 2025-04-08:
| 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 |
55353 |
23399 |
4211 |
932 |
215 |
69 |
6 |
0 |
| OW |
0 |
486 |
1658 |
1177 |
564 |
211 |
62 |
0 |
| VODI |
0 |
46 |
778 |
718 |
832 |
704 |
361 |
0 |
| ODI |
0 |
2 |
202 |
362 |
536 |
978 |
984 |
21 |
| CDI |
0 |
0 |
66 |
196 |
454 |
1200 |
7363 |
250 |
| VCDI |
0 |
0 |
3 |
48 |
113 |
438 |
28468 |
25378 |
|
...date precedes bulletin
|
Date: 2025-04-10:
| 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 |
55069 |
23602 |
3910 |
908 |
457 |
108 |
1 |
0 |
| OW |
0 |
317 |
1451 |
883 |
1055 |
399 |
5 |
0 |
| VODI |
0 |
29 |
709 |
678 |
1046 |
979 |
235 |
10 |
| ODI |
0 |
1 |
112 |
281 |
571 |
1283 |
796 |
138 |
| CDI |
0 |
0 |
39 |
180 |
302 |
1572 |
5952 |
349 |
| VCDI |
0 |
0 |
4 |
67 |
168 |
757 |
28694 |
25727 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
55069 |
23567 |
4044 |
947 |
491 |
128 |
1 |
0 |
| OW |
0 |
352 |
1444 |
894 |
1092 |
394 |
13 |
0 |
| VODI |
0 |
25 |
577 |
649 |
1024 |
1033 |
242 |
11 |
| ODI |
0 |
5 |
111 |
268 |
534 |
1370 |
885 |
144 |
| CDI |
0 |
0 |
43 |
162 |
294 |
1475 |
6261 |
343 |
| VCDI |
0 |
0 |
6 |
77 |
164 |
698 |
28281 |
25726 |
|
Date: 2025-04-14:
| 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 |
56877 |
22960 |
3854 |
766 |
300 |
48 |
1 |
0 |
| OW |
0 |
360 |
1267 |
825 |
765 |
385 |
78 |
0 |
| VODI |
0 |
133 |
472 |
706 |
800 |
709 |
402 |
7 |
| ODI |
0 |
13 |
202 |
495 |
574 |
636 |
1475 |
76 |
| CDI |
0 |
2 |
117 |
532 |
593 |
1851 |
5406 |
264 |
| VCDI |
0 |
0 |
65 |
219 |
412 |
1077 |
31575 |
21545 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
56877 |
22802 |
3671 |
611 |
276 |
45 |
2 |
0 |
| OW |
0 |
569 |
1455 |
919 |
648 |
309 |
48 |
0 |
| VODI |
0 |
85 |
535 |
814 |
954 |
812 |
458 |
0 |
| ODI |
0 |
10 |
191 |
515 |
561 |
704 |
1577 |
84 |
| CDI |
0 |
2 |
81 |
446 |
542 |
1809 |
5741 |
313 |
| VCDI |
0 |
0 |
44 |
238 |
463 |
1027 |
31111 |
21495 |
|
Date: 2025-04-16:
| 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 |
56956 |
23239 |
3958 |
762 |
153 |
52 |
2 |
0 |
| OW |
0 |
235 |
1479 |
832 |
562 |
238 |
71 |
0 |
| VODI |
0 |
61 |
575 |
809 |
695 |
602 |
486 |
0 |
| ODI |
0 |
9 |
162 |
443 |
657 |
718 |
1172 |
50 |
| CDI |
0 |
0 |
87 |
339 |
703 |
1260 |
7279 |
659 |
| VCDI |
0 |
0 |
0 |
126 |
188 |
497 |
28419 |
24309 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
56956 |
22967 |
3643 |
608 |
113 |
39 |
0 |
0 |
| OW |
0 |
445 |
1369 |
836 |
578 |
223 |
75 |
0 |
| VODI |
0 |
119 |
886 |
722 |
700 |
647 |
652 |
16 |
| ODI |
0 |
13 |
253 |
413 |
600 |
655 |
1413 |
89 |
| CDI |
0 |
0 |
109 |
519 |
688 |
1093 |
6871 |
293 |
| VCDI |
0 |
0 |
1 |
213 |
279 |
710 |
28418 |
24620 |
|
Date: 2025-04-18:
| Best estimate |
Forecast |
|
...observations not yet available
|
...observations not yet available
|
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