Validation of sea ice concentration
Bulletin date: 2025-02-27
Model vs. observations, sea ice class contingency tables
Date: 2025-02-21:
| 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 |
56695 |
23242 |
3605 |
1254 |
285 |
64 |
1 |
0 |
| OW |
0 |
116 |
1012 |
1343 |
724 |
205 |
30 |
0 |
| VODI |
0 |
35 |
218 |
1027 |
1107 |
837 |
241 |
0 |
| ODI |
0 |
13 |
28 |
411 |
814 |
1436 |
695 |
0 |
| CDI |
0 |
5 |
28 |
206 |
677 |
2158 |
4107 |
11 |
| VCDI |
0 |
0 |
2 |
126 |
464 |
3527 |
33119 |
18976 |
|
...date precedes bulletin
|
Date: 2025-02-25:
| 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 |
60130 |
23026 |
3914 |
610 |
85 |
53 |
12 |
0 |
| OW |
0 |
389 |
2315 |
1147 |
286 |
182 |
70 |
0 |
| VODI |
0 |
14 |
1028 |
1151 |
722 |
841 |
346 |
1 |
| ODI |
0 |
0 |
361 |
723 |
416 |
616 |
1087 |
23 |
| CDI |
0 |
0 |
184 |
547 |
414 |
704 |
4541 |
191 |
| VCDI |
0 |
0 |
180 |
485 |
389 |
814 |
28688 |
22159 |
|
...date precedes bulletin
|
Date: 2025-02-27:
| 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 |
60066 |
24386 |
3235 |
705 |
102 |
57 |
5 |
0 |
| OW |
0 |
506 |
2067 |
1132 |
348 |
77 |
59 |
0 |
| VODI |
0 |
166 |
1078 |
1337 |
1040 |
453 |
102 |
0 |
| ODI |
0 |
51 |
397 |
702 |
814 |
864 |
341 |
0 |
| CDI |
0 |
32 |
306 |
547 |
776 |
1663 |
3070 |
74 |
| VCDI |
0 |
3 |
342 |
446 |
763 |
1953 |
29178 |
19601 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
60066 |
24387 |
3356 |
696 |
107 |
61 |
3 |
0 |
| OW |
0 |
500 |
1936 |
1106 |
335 |
70 |
52 |
0 |
| VODI |
0 |
174 |
1043 |
1362 |
1060 |
434 |
113 |
0 |
| ODI |
0 |
61 |
425 |
641 |
805 |
858 |
359 |
1 |
| CDI |
0 |
20 |
355 |
610 |
778 |
1689 |
3191 |
75 |
| VCDI |
0 |
2 |
310 |
454 |
758 |
1955 |
29037 |
19599 |
|
Date: 2025-03-03:
| 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 |
61111 |
23639 |
4459 |
667 |
113 |
78 |
43 |
0 |
| OW |
0 |
379 |
2681 |
917 |
348 |
134 |
39 |
0 |
| VODI |
0 |
4 |
1342 |
1434 |
964 |
481 |
179 |
5 |
| ODI |
0 |
0 |
340 |
708 |
906 |
844 |
475 |
29 |
| CDI |
0 |
0 |
281 |
522 |
851 |
1127 |
2988 |
319 |
| VCDI |
0 |
0 |
162 |
334 |
626 |
932 |
24707 |
23676 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
61111 |
23232 |
3921 |
698 |
151 |
108 |
41 |
0 |
| OW |
0 |
723 |
2035 |
740 |
279 |
128 |
37 |
0 |
| VODI |
0 |
66 |
1386 |
972 |
718 |
523 |
230 |
4 |
| ODI |
0 |
1 |
845 |
692 |
725 |
580 |
475 |
30 |
| CDI |
0 |
0 |
571 |
728 |
881 |
1065 |
2128 |
365 |
| VCDI |
0 |
0 |
507 |
752 |
1054 |
1192 |
25520 |
23630 |
|
Date: 2025-03-05:
| 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 |
60796 |
23040 |
4805 |
1225 |
390 |
203 |
48 |
0 |
| OW |
0 |
212 |
1694 |
1009 |
550 |
286 |
64 |
0 |
| VODI |
0 |
65 |
907 |
907 |
950 |
917 |
184 |
0 |
| ODI |
0 |
14 |
388 |
653 |
897 |
1104 |
445 |
23 |
| CDI |
0 |
0 |
180 |
391 |
674 |
1282 |
2249 |
258 |
| VCDI |
0 |
0 |
123 |
331 |
612 |
1966 |
27251 |
21751 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
60796 |
22273 |
4090 |
1050 |
463 |
245 |
69 |
0 |
| OW |
0 |
638 |
1580 |
820 |
442 |
261 |
31 |
0 |
| VODI |
0 |
324 |
1068 |
975 |
880 |
835 |
261 |
7 |
| ODI |
0 |
80 |
611 |
651 |
825 |
772 |
515 |
89 |
| CDI |
0 |
16 |
506 |
500 |
658 |
1228 |
1848 |
297 |
| VCDI |
0 |
0 |
242 |
520 |
805 |
2417 |
27517 |
21639 |
|
Date: 2025-03-07:
| 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 |
60108 |
23709 |
4284 |
826 |
491 |
134 |
49 |
0 |
| OW |
0 |
631 |
1803 |
893 |
479 |
220 |
42 |
0 |
| VODI |
0 |
186 |
1218 |
1290 |
831 |
639 |
212 |
3 |
| ODI |
0 |
100 |
421 |
810 |
765 |
825 |
432 |
29 |
| CDI |
0 |
57 |
176 |
648 |
656 |
1344 |
1802 |
290 |
| VCDI |
0 |
28 |
261 |
306 |
653 |
1622 |
27386 |
22185 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
60108 |
22833 |
4317 |
970 |
539 |
164 |
58 |
0 |
| OW |
0 |
985 |
1183 |
946 |
478 |
194 |
129 |
0 |
| VODI |
0 |
518 |
1194 |
1065 |
833 |
620 |
365 |
10 |
| ODI |
0 |
155 |
567 |
684 |
683 |
815 |
528 |
109 |
| CDI |
0 |
126 |
483 |
607 |
590 |
1153 |
1732 |
328 |
| VCDI |
0 |
94 |
419 |
501 |
752 |
1838 |
27111 |
22060 |
|
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