Validation of sea ice concentration
Bulletin date: 2025-01-23
Model vs. observations, sea ice class contingency tables
Date: 2025-01-17:
| 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 |
61970 |
23717 |
2866 |
405 |
67 |
11 |
2 |
0 |
| OW |
0 |
826 |
2073 |
724 |
240 |
121 |
36 |
0 |
| VODI |
0 |
364 |
1242 |
834 |
368 |
275 |
120 |
0 |
| ODI |
0 |
110 |
472 |
426 |
415 |
566 |
380 |
0 |
| CDI |
0 |
60 |
431 |
519 |
592 |
948 |
3754 |
23 |
| VCDI |
0 |
17 |
192 |
224 |
512 |
931 |
31603 |
20408 |
|
...date precedes bulletin
|
Date: 2025-01-21:
| 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 |
60524 |
24091 |
2843 |
573 |
212 |
19 |
1 |
0 |
| OW |
0 |
629 |
1307 |
503 |
470 |
135 |
14 |
0 |
| VODI |
0 |
135 |
798 |
536 |
689 |
512 |
151 |
0 |
| ODI |
0 |
19 |
270 |
429 |
509 |
849 |
526 |
27 |
| CDI |
0 |
0 |
73 |
419 |
580 |
1267 |
4571 |
401 |
| VCDI |
0 |
0 |
53 |
150 |
238 |
653 |
21406 |
32250 |
|
...date precedes bulletin
|
Date: 2025-01-23:
| 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 |
60530 |
23661 |
2698 |
458 |
183 |
31 |
0 |
0 |
| OW |
0 |
375 |
1656 |
528 |
269 |
133 |
5 |
0 |
| VODI |
0 |
131 |
879 |
675 |
586 |
496 |
141 |
0 |
| ODI |
0 |
32 |
305 |
365 |
686 |
920 |
777 |
1 |
| CDI |
0 |
0 |
164 |
248 |
595 |
1268 |
5933 |
43 |
| VCDI |
0 |
0 |
2 |
21 |
177 |
789 |
27264 |
25819 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
60530 |
23705 |
2777 |
458 |
171 |
36 |
0 |
0 |
| OW |
0 |
365 |
1589 |
537 |
288 |
130 |
6 |
0 |
| VODI |
0 |
110 |
897 |
674 |
606 |
510 |
126 |
0 |
| ODI |
0 |
19 |
300 |
386 |
695 |
904 |
811 |
4 |
| CDI |
0 |
0 |
138 |
220 |
554 |
1264 |
6218 |
71 |
| VCDI |
0 |
0 |
3 |
20 |
182 |
793 |
26959 |
25788 |
|
Date: 2025-01-27:
| 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 |
60748 |
23958 |
2887 |
558 |
66 |
4 |
2 |
0 |
| OW |
0 |
459 |
2199 |
1506 |
316 |
126 |
69 |
0 |
| VODI |
0 |
45 |
771 |
1232 |
659 |
434 |
410 |
1 |
| ODI |
0 |
2 |
185 |
542 |
644 |
651 |
854 |
8 |
| CDI |
0 |
0 |
87 |
557 |
611 |
1394 |
3044 |
76 |
| VCDI |
0 |
0 |
65 |
628 |
368 |
893 |
26643 |
25142 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
60748 |
23773 |
2613 |
504 |
58 |
4 |
2 |
0 |
| OW |
0 |
446 |
1634 |
982 |
189 |
65 |
21 |
0 |
| VODI |
0 |
141 |
1192 |
1355 |
563 |
272 |
252 |
0 |
| ODI |
0 |
69 |
357 |
775 |
549 |
494 |
802 |
5 |
| CDI |
0 |
35 |
264 |
657 |
704 |
1313 |
3348 |
53 |
| VCDI |
0 |
0 |
134 |
750 |
601 |
1354 |
26597 |
25169 |
|
Date: 2025-01-29:
| 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 |
61622 |
24184 |
2884 |
644 |
157 |
24 |
1 |
0 |
| OW |
0 |
702 |
1816 |
918 |
412 |
97 |
32 |
0 |
| VODI |
0 |
166 |
1004 |
1029 |
803 |
404 |
190 |
0 |
| ODI |
0 |
28 |
345 |
488 |
681 |
617 |
498 |
2 |
| CDI |
0 |
11 |
199 |
374 |
606 |
1459 |
2566 |
93 |
| VCDI |
0 |
16 |
126 |
424 |
400 |
902 |
27734 |
24186 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
61622 |
23568 |
2287 |
502 |
136 |
23 |
0 |
0 |
| OW |
0 |
833 |
1337 |
660 |
226 |
68 |
3 |
0 |
| VODI |
0 |
460 |
1371 |
957 |
773 |
361 |
150 |
0 |
| ODI |
0 |
152 |
629 |
616 |
664 |
546 |
648 |
11 |
| CDI |
0 |
82 |
496 |
574 |
688 |
1237 |
2461 |
144 |
| VCDI |
0 |
12 |
254 |
568 |
572 |
1268 |
27759 |
24126 |
|
Date: 2025-01-31:
| 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 |
62247 |
24099 |
2553 |
482 |
128 |
33 |
6 |
0 |
| OW |
0 |
865 |
1624 |
999 |
292 |
80 |
36 |
0 |
| VODI |
0 |
527 |
1094 |
1029 |
776 |
391 |
139 |
0 |
| ODI |
0 |
39 |
412 |
629 |
688 |
548 |
476 |
15 |
| CDI |
0 |
21 |
171 |
525 |
777 |
1040 |
2755 |
339 |
| VCDI |
0 |
27 |
112 |
203 |
452 |
1039 |
27475 |
23701 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
62247 |
23404 |
1896 |
447 |
105 |
38 |
12 |
0 |
| OW |
0 |
1105 |
1365 |
615 |
205 |
42 |
35 |
0 |
| VODI |
0 |
763 |
1479 |
1092 |
718 |
308 |
112 |
0 |
| ODI |
0 |
231 |
562 |
715 |
679 |
615 |
481 |
19 |
| CDI |
0 |
55 |
413 |
550 |
640 |
999 |
2470 |
404 |
| VCDI |
0 |
20 |
251 |
448 |
766 |
1129 |
27777 |
23632 |
|
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