Validation of sea ice concentration
Bulletin date: 2025-02-06
Model vs. observations, sea ice class contingency tables
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 |
|
...date precedes bulletin
|
Date: 2025-02-04:
| 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 |
65295 |
23416 |
1864 |
198 |
62 |
3 |
4 |
0 |
| OW |
0 |
2436 |
2130 |
823 |
140 |
58 |
40 |
0 |
| VODI |
0 |
417 |
1199 |
947 |
505 |
361 |
174 |
0 |
| ODI |
0 |
105 |
579 |
587 |
419 |
761 |
655 |
2 |
| CDI |
0 |
71 |
697 |
794 |
688 |
1373 |
4063 |
126 |
| VCDI |
0 |
15 |
298 |
789 |
613 |
1471 |
25384 |
19282 |
|
...date precedes bulletin
|
Date: 2025-02-06:
| 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 |
63837 |
25142 |
2166 |
519 |
57 |
16 |
4 |
0 |
| OW |
0 |
1580 |
1741 |
844 |
156 |
191 |
58 |
0 |
| VODI |
0 |
410 |
1617 |
1112 |
547 |
423 |
347 |
0 |
| ODI |
0 |
124 |
696 |
612 |
456 |
607 |
886 |
16 |
| CDI |
0 |
83 |
696 |
967 |
749 |
1307 |
3330 |
134 |
| VCDI |
0 |
6 |
561 |
1589 |
907 |
1611 |
25139 |
17601 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
63837 |
25168 |
2165 |
505 |
60 |
40 |
2 |
0 |
| OW |
0 |
1553 |
1713 |
818 |
137 |
162 |
31 |
0 |
| VODI |
0 |
418 |
1604 |
1149 |
534 |
399 |
357 |
0 |
| ODI |
0 |
114 |
706 |
631 |
464 |
586 |
873 |
18 |
| CDI |
0 |
84 |
710 |
988 |
816 |
1383 |
3596 |
143 |
| VCDI |
0 |
8 |
579 |
1552 |
861 |
1585 |
24905 |
17590 |
|
Date: 2025-02-10:
| 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 |
61958 |
24203 |
3204 |
298 |
77 |
35 |
3 |
0 |
| OW |
0 |
1115 |
3129 |
1117 |
425 |
199 |
26 |
0 |
| VODI |
0 |
122 |
1752 |
1150 |
952 |
793 |
148 |
0 |
| ODI |
0 |
0 |
622 |
595 |
829 |
1317 |
432 |
0 |
| CDI |
0 |
0 |
414 |
603 |
1089 |
2745 |
3378 |
9 |
| VCDI |
0 |
0 |
232 |
410 |
711 |
2425 |
22977 |
19350 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
61958 |
23816 |
3078 |
322 |
82 |
43 |
2 |
0 |
| OW |
0 |
1132 |
2055 |
558 |
297 |
129 |
6 |
0 |
| VODI |
0 |
390 |
2164 |
1182 |
734 |
609 |
127 |
0 |
| ODI |
0 |
101 |
862 |
679 |
784 |
1083 |
389 |
0 |
| CDI |
0 |
1 |
699 |
791 |
1276 |
2667 |
3739 |
41 |
| VCDI |
0 |
0 |
495 |
641 |
910 |
2983 |
22701 |
19318 |
|
Date: 2025-02-12:
| 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 |
59057 |
23909 |
4007 |
1044 |
382 |
34 |
2 |
0 |
| OW |
0 |
379 |
2182 |
1666 |
827 |
162 |
42 |
0 |
| VODI |
0 |
146 |
931 |
958 |
1261 |
469 |
210 |
0 |
| ODI |
0 |
30 |
573 |
634 |
987 |
884 |
416 |
0 |
| CDI |
0 |
0 |
403 |
573 |
1404 |
2283 |
3840 |
16 |
| VCDI |
0 |
0 |
207 |
725 |
1835 |
5337 |
26736 |
14290 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
59057 |
23549 |
3804 |
985 |
382 |
47 |
10 |
0 |
| OW |
0 |
562 |
1539 |
1055 |
625 |
73 |
22 |
0 |
| VODI |
0 |
210 |
1433 |
1285 |
1118 |
416 |
218 |
0 |
| ODI |
0 |
115 |
535 |
751 |
1073 |
755 |
438 |
0 |
| CDI |
0 |
28 |
642 |
580 |
1775 |
2574 |
3719 |
6 |
| VCDI |
0 |
0 |
350 |
944 |
1723 |
5304 |
26839 |
14300 |
|
Date: 2025-02-14:
| 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 |
58787 |
24183 |
2983 |
698 |
188 |
61 |
2 |
0 |
| OW |
0 |
306 |
1577 |
1309 |
684 |
328 |
3 |
0 |
| VODI |
0 |
111 |
458 |
1214 |
1270 |
1012 |
124 |
0 |
| ODI |
0 |
41 |
140 |
475 |
739 |
1461 |
489 |
0 |
| CDI |
0 |
6 |
45 |
330 |
683 |
3124 |
4268 |
29 |
| VCDI |
0 |
0 |
0 |
95 |
470 |
3053 |
27012 |
21086 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
58787 |
23870 |
2482 |
677 |
200 |
52 |
1 |
0 |
| OW |
0 |
607 |
1656 |
938 |
567 |
244 |
2 |
0 |
| VODI |
0 |
138 |
812 |
1257 |
1078 |
852 |
85 |
0 |
| ODI |
0 |
27 |
214 |
731 |
955 |
1416 |
528 |
6 |
| CDI |
0 |
5 |
39 |
325 |
644 |
3739 |
3847 |
109 |
| VCDI |
0 |
0 |
0 |
193 |
590 |
2736 |
27435 |
21000 |
|
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