Validation of sea ice concentration
Bulletin date: 2025-04-03
Model vs. observations, sea ice class contingency tables
Date: 2025-03-28:
| 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 |
56756 |
23953 |
3165 |
981 |
273 |
22 |
2 |
0 |
| OW |
0 |
249 |
1850 |
1164 |
909 |
124 |
63 |
0 |
| VODI |
0 |
82 |
710 |
1238 |
1152 |
654 |
373 |
66 |
| ODI |
0 |
32 |
253 |
755 |
680 |
1160 |
1100 |
157 |
| CDI |
0 |
12 |
235 |
521 |
653 |
953 |
5412 |
333 |
| VCDI |
0 |
0 |
321 |
390 |
456 |
660 |
26930 |
24045 |
|
...date precedes bulletin
|
Date: 2025-04-01:
| 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 |
56950 |
24469 |
3421 |
699 |
122 |
82 |
4 |
0 |
| OW |
0 |
621 |
1951 |
920 |
412 |
100 |
70 |
0 |
| VODI |
0 |
175 |
1002 |
792 |
690 |
619 |
407 |
6 |
| ODI |
0 |
61 |
395 |
447 |
508 |
848 |
1129 |
30 |
| CDI |
0 |
3 |
306 |
509 |
588 |
1419 |
5880 |
189 |
| VCDI |
0 |
0 |
138 |
107 |
170 |
751 |
25156 |
26698 |
|
...date precedes bulletin
|
Date: 2025-04-03:
| 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 |
57576 |
24080 |
2895 |
406 |
141 |
77 |
10 |
0 |
| OW |
0 |
720 |
1775 |
964 |
421 |
167 |
42 |
0 |
| VODI |
0 |
219 |
1123 |
989 |
740 |
654 |
238 |
0 |
| ODI |
0 |
33 |
444 |
621 |
610 |
1007 |
702 |
3 |
| CDI |
0 |
0 |
321 |
597 |
603 |
1146 |
5673 |
57 |
| VCDI |
0 |
0 |
79 |
94 |
267 |
459 |
24896 |
27995 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
57576 |
24115 |
3007 |
440 |
141 |
87 |
15 |
0 |
| OW |
0 |
684 |
1694 |
1037 |
471 |
163 |
51 |
0 |
| VODI |
0 |
219 |
1084 |
859 |
725 |
673 |
261 |
0 |
| ODI |
0 |
34 |
485 |
657 |
581 |
1000 |
705 |
5 |
| CDI |
0 |
0 |
299 |
591 |
592 |
1133 |
5919 |
51 |
| VCDI |
0 |
0 |
68 |
87 |
272 |
454 |
24610 |
27999 |
|
Date: 2025-04-07:
| 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 |
55695 |
23021 |
4272 |
902 |
213 |
53 |
19 |
0 |
| OW |
0 |
695 |
1666 |
1066 |
433 |
234 |
133 |
0 |
| VODI |
0 |
80 |
820 |
750 |
847 |
804 |
355 |
0 |
| ODI |
0 |
5 |
253 |
355 |
475 |
1002 |
1236 |
53 |
| CDI |
0 |
0 |
119 |
259 |
436 |
1220 |
7608 |
349 |
| VCDI |
0 |
0 |
17 |
101 |
99 |
373 |
25936 |
26890 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
55695 |
22623 |
3867 |
843 |
205 |
58 |
20 |
0 |
| OW |
0 |
820 |
1505 |
916 |
410 |
220 |
85 |
0 |
| VODI |
0 |
330 |
1033 |
713 |
646 |
711 |
406 |
7 |
| ODI |
0 |
28 |
439 |
445 |
438 |
832 |
1411 |
84 |
| CDI |
0 |
0 |
249 |
377 |
630 |
1415 |
8571 |
440 |
| VCDI |
0 |
0 |
54 |
139 |
174 |
450 |
24794 |
26761 |
|
Date: 2025-04-09:
| 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 |
55144 |
23900 |
3872 |
863 |
285 |
69 |
2 |
0 |
| OW |
0 |
358 |
1637 |
1199 |
671 |
238 |
22 |
0 |
| VODI |
0 |
34 |
774 |
823 |
959 |
731 |
242 |
0 |
| ODI |
0 |
1 |
152 |
334 |
680 |
1071 |
832 |
9 |
| CDI |
0 |
0 |
52 |
141 |
374 |
1445 |
6189 |
218 |
| VCDI |
0 |
0 |
4 |
53 |
143 |
417 |
28282 |
26624 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
55144 |
23178 |
3425 |
872 |
262 |
44 |
2 |
0 |
| OW |
0 |
880 |
1334 |
1005 |
558 |
230 |
19 |
0 |
| VODI |
0 |
222 |
1158 |
790 |
882 |
633 |
198 |
0 |
| ODI |
0 |
13 |
427 |
386 |
679 |
933 |
716 |
100 |
| CDI |
0 |
0 |
142 |
241 |
530 |
1633 |
6824 |
404 |
| VCDI |
0 |
0 |
5 |
119 |
201 |
498 |
27810 |
26347 |
|
Date: 2025-04-11:
| 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 |
55104 |
23416 |
3650 |
1303 |
523 |
81 |
2 |
0 |
| OW |
0 |
320 |
1186 |
917 |
1082 |
493 |
52 |
0 |
| VODI |
0 |
26 |
637 |
730 |
867 |
946 |
468 |
36 |
| ODI |
0 |
4 |
128 |
362 |
541 |
716 |
1410 |
123 |
| CDI |
0 |
0 |
61 |
240 |
376 |
979 |
6378 |
411 |
| VCDI |
0 |
0 |
13 |
144 |
307 |
734 |
28138 |
25940 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
55104 |
21870 |
2841 |
1387 |
807 |
317 |
31 |
0 |
| OW |
0 |
1169 |
867 |
611 |
843 |
542 |
179 |
0 |
| VODI |
0 |
573 |
985 |
549 |
670 |
774 |
573 |
0 |
| ODI |
0 |
67 |
614 |
389 |
480 |
626 |
1043 |
88 |
| CDI |
0 |
78 |
234 |
386 |
391 |
1011 |
5839 |
371 |
| VCDI |
0 |
9 |
134 |
374 |
505 |
679 |
28783 |
26051 |
|
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