Validation of sea ice concentration
Bulletin date: 2025-03-20
Model vs. observations, sea ice class contingency tables
Date: 2025-03-14:
| 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 |
55703 |
23550 |
3127 |
1349 |
486 |
291 |
110 |
0 |
| OW |
0 |
283 |
994 |
1200 |
611 |
366 |
171 |
0 |
| VODI |
0 |
55 |
381 |
997 |
929 |
946 |
539 |
21 |
| ODI |
0 |
3 |
93 |
531 |
826 |
1476 |
1188 |
50 |
| CDI |
0 |
0 |
49 |
307 |
485 |
1895 |
5860 |
464 |
| VCDI |
0 |
0 |
37 |
269 |
677 |
1257 |
24932 |
26336 |
|
...date precedes bulletin
|
Date: 2025-03-18:
| 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 |
56448 |
21950 |
4256 |
676 |
141 |
122 |
2 |
0 |
| OW |
0 |
129 |
1563 |
943 |
404 |
274 |
73 |
0 |
| VODI |
0 |
25 |
534 |
1112 |
971 |
845 |
323 |
0 |
| ODI |
0 |
4 |
178 |
481 |
734 |
1225 |
1165 |
8 |
| CDI |
0 |
0 |
86 |
286 |
405 |
1581 |
7538 |
310 |
| VCDI |
0 |
0 |
62 |
144 |
212 |
979 |
29823 |
22832 |
|
...date precedes bulletin
|
Date: 2025-03-20:
| 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 |
55591 |
22508 |
3546 |
936 |
405 |
63 |
0 |
0 |
| OW |
0 |
138 |
987 |
1130 |
662 |
366 |
44 |
0 |
| VODI |
0 |
10 |
394 |
872 |
1090 |
1031 |
357 |
8 |
| ODI |
0 |
0 |
166 |
433 |
667 |
1341 |
1260 |
19 |
| CDI |
0 |
0 |
90 |
513 |
534 |
1991 |
7391 |
1063 |
| VCDI |
0 |
0 |
18 |
218 |
229 |
1260 |
27225 |
24288 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
55591 |
22506 |
3429 |
959 |
390 |
49 |
0 |
0 |
| OW |
0 |
133 |
1111 |
1089 |
655 |
378 |
46 |
1 |
| VODI |
0 |
17 |
392 |
914 |
1101 |
1036 |
376 |
8 |
| ODI |
0 |
0 |
160 |
430 |
693 |
1381 |
1326 |
19 |
| CDI |
0 |
0 |
99 |
540 |
539 |
1984 |
7658 |
909 |
| VCDI |
0 |
0 |
10 |
170 |
209 |
1224 |
26871 |
24441 |
|
Date: 2025-03-24:
| 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 |
59352 |
23496 |
1213 |
235 |
160 |
21 |
14 |
0 |
| OW |
0 |
1541 |
1372 |
698 |
519 |
158 |
90 |
1 |
| VODI |
0 |
222 |
825 |
876 |
894 |
503 |
478 |
4 |
| ODI |
0 |
24 |
245 |
401 |
568 |
892 |
1274 |
40 |
| CDI |
0 |
1 |
210 |
278 |
435 |
1272 |
5465 |
265 |
| VCDI |
0 |
0 |
103 |
245 |
412 |
1413 |
23282 |
29347 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
59352 |
22971 |
1037 |
189 |
144 |
8 |
7 |
0 |
| OW |
0 |
1668 |
917 |
508 |
344 |
69 |
79 |
0 |
| VODI |
0 |
520 |
999 |
778 |
679 |
374 |
412 |
12 |
| ODI |
0 |
84 |
438 |
530 |
626 |
647 |
1209 |
36 |
| CDI |
0 |
29 |
318 |
391 |
655 |
1401 |
6263 |
302 |
| VCDI |
0 |
12 |
259 |
337 |
540 |
1760 |
22633 |
29307 |
|
Date: 2025-03-26:
| 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 |
57571 |
23344 |
3102 |
601 |
219 |
51 |
8 |
0 |
| OW |
0 |
291 |
1721 |
1315 |
499 |
231 |
147 |
0 |
| VODI |
0 |
24 |
591 |
1251 |
1015 |
641 |
568 |
38 |
| ODI |
0 |
0 |
129 |
477 |
640 |
959 |
1529 |
171 |
| CDI |
0 |
0 |
41 |
339 |
348 |
1010 |
5350 |
417 |
| VCDI |
0 |
0 |
2 |
302 |
374 |
2697 |
22860 |
27971 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
57571 |
22870 |
2406 |
447 |
175 |
30 |
0 |
0 |
| OW |
0 |
599 |
1646 |
931 |
363 |
143 |
184 |
0 |
| VODI |
0 |
138 |
996 |
1342 |
858 |
442 |
481 |
59 |
| ODI |
0 |
39 |
299 |
608 |
689 |
802 |
1154 |
171 |
| CDI |
0 |
13 |
178 |
470 |
554 |
1415 |
7718 |
409 |
| VCDI |
0 |
0 |
61 |
487 |
456 |
2757 |
20925 |
27958 |
|
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 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
56756 |
23022 |
2348 |
741 |
339 |
18 |
0 |
0 |
| OW |
0 |
699 |
1650 |
955 |
621 |
81 |
18 |
0 |
| VODI |
0 |
289 |
1178 |
1080 |
957 |
351 |
285 |
79 |
| ODI |
0 |
138 |
472 |
803 |
683 |
758 |
839 |
110 |
| CDI |
0 |
180 |
445 |
938 |
988 |
1697 |
7783 |
354 |
| VCDI |
0 |
0 |
441 |
532 |
535 |
668 |
24955 |
24058 |
|
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