Validation of sea ice concentration
Bulletin date: 2025-03-13
Model vs. observations, sea ice class contingency tables
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 |
|
...date precedes bulletin
|
Date: 2025-03-11:
| 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 |
57000 |
23462 |
4056 |
1193 |
603 |
288 |
72 |
0 |
| OW |
0 |
199 |
1414 |
880 |
698 |
489 |
90 |
0 |
| VODI |
0 |
11 |
641 |
839 |
1032 |
1299 |
240 |
0 |
| ODI |
0 |
0 |
216 |
499 |
871 |
1736 |
628 |
5 |
| CDI |
0 |
0 |
76 |
243 |
468 |
2089 |
3612 |
91 |
| VCDI |
0 |
0 |
9 |
44 |
291 |
1464 |
27255 |
24741 |
|
...date precedes bulletin
|
Date: 2025-03-13:
| 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 |
56925 |
23228 |
3069 |
1250 |
495 |
260 |
49 |
0 |
| OW |
0 |
321 |
1216 |
983 |
631 |
353 |
102 |
0 |
| VODI |
0 |
89 |
573 |
878 |
968 |
924 |
548 |
0 |
| ODI |
0 |
4 |
171 |
429 |
642 |
1478 |
1129 |
32 |
| CDI |
0 |
0 |
29 |
308 |
413 |
1729 |
5047 |
375 |
| VCDI |
0 |
0 |
0 |
65 |
156 |
471 |
26390 |
27114 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
56925 |
23270 |
3038 |
1278 |
524 |
289 |
55 |
0 |
| OW |
0 |
284 |
1223 |
940 |
653 |
360 |
93 |
0 |
| VODI |
0 |
85 |
586 |
883 |
926 |
951 |
537 |
1 |
| ODI |
0 |
3 |
182 |
441 |
632 |
1470 |
1233 |
47 |
| CDI |
0 |
0 |
29 |
309 |
424 |
1665 |
5136 |
444 |
| VCDI |
0 |
0 |
0 |
62 |
146 |
480 |
26211 |
27029 |
|
Date: 2025-03-17:
| 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 |
56568 |
25914 |
224 |
820 |
295 |
72 |
0 |
0 |
| OW |
0 |
1756 |
155 |
772 |
506 |
343 |
57 |
0 |
| VODI |
0 |
666 |
128 |
930 |
885 |
830 |
483 |
31 |
| ODI |
0 |
201 |
46 |
280 |
546 |
963 |
1580 |
182 |
| CDI |
0 |
110 |
31 |
169 |
417 |
938 |
6191 |
944 |
| VCDI |
0 |
32 |
11 |
49 |
147 |
390 |
22258 |
31920 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
56568 |
25172 |
209 |
728 |
340 |
110 |
0 |
0 |
| OW |
0 |
2033 |
145 |
649 |
449 |
362 |
52 |
0 |
| VODI |
0 |
916 |
137 |
931 |
744 |
714 |
584 |
32 |
| ODI |
0 |
282 |
47 |
412 |
613 |
859 |
1485 |
206 |
| CDI |
0 |
201 |
34 |
215 |
484 |
1060 |
7307 |
1329 |
| VCDI |
0 |
75 |
23 |
85 |
166 |
431 |
21141 |
31510 |
|
Date: 2025-03-19:
| 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 |
56293 |
22119 |
3884 |
691 |
130 |
68 |
0 |
0 |
| OW |
0 |
142 |
1530 |
896 |
393 |
314 |
41 |
0 |
| VODI |
0 |
0 |
626 |
1042 |
886 |
870 |
369 |
5 |
| ODI |
0 |
0 |
185 |
503 |
765 |
1341 |
1197 |
8 |
| CDI |
0 |
0 |
95 |
451 |
494 |
1775 |
7567 |
1053 |
| VCDI |
0 |
0 |
27 |
211 |
226 |
1099 |
26913 |
24635 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
56293 |
21764 |
3356 |
784 |
161 |
132 |
1 |
0 |
| OW |
0 |
436 |
1594 |
806 |
396 |
261 |
65 |
0 |
| VODI |
0 |
61 |
884 |
924 |
879 |
869 |
376 |
0 |
| ODI |
0 |
0 |
317 |
430 |
676 |
1174 |
1284 |
5 |
| CDI |
0 |
0 |
158 |
406 |
483 |
1565 |
7432 |
1384 |
| VCDI |
0 |
0 |
38 |
444 |
299 |
1466 |
26929 |
24312 |
|
Date: 2025-03-21:
| 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 |
56500 |
22030 |
3506 |
816 |
188 |
22 |
1 |
0 |
| OW |
0 |
301 |
1401 |
814 |
489 |
202 |
52 |
3 |
| VODI |
0 |
23 |
902 |
1117 |
780 |
700 |
198 |
13 |
| ODI |
0 |
5 |
321 |
563 |
692 |
1116 |
1099 |
26 |
| CDI |
0 |
0 |
148 |
598 |
689 |
1470 |
8124 |
831 |
| VCDI |
0 |
0 |
61 |
253 |
526 |
1627 |
26877 |
23760 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
56500 |
21395 |
3021 |
1062 |
358 |
125 |
32 |
0 |
| OW |
0 |
683 |
1214 |
710 |
531 |
251 |
112 |
0 |
| VODI |
0 |
214 |
1090 |
821 |
651 |
787 |
227 |
0 |
| ODI |
0 |
49 |
531 |
576 |
529 |
992 |
891 |
7 |
| CDI |
0 |
18 |
319 |
460 |
725 |
1190 |
6883 |
874 |
| VCDI |
0 |
0 |
164 |
532 |
570 |
1792 |
28206 |
23752 |
|
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