Validation of sea ice concentration
Bulletin date: 2025-03-06
Model vs. observations, sea ice class contingency tables
Date: 2025-02-28:
| 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 |
60807 |
23804 |
3429 |
609 |
124 |
50 |
28 |
0 |
| OW |
0 |
395 |
2187 |
978 |
399 |
94 |
85 |
0 |
| VODI |
0 |
128 |
1117 |
1359 |
928 |
465 |
143 |
0 |
| ODI |
0 |
62 |
470 |
798 |
691 |
794 |
338 |
7 |
| CDI |
0 |
30 |
344 |
520 |
789 |
1677 |
2750 |
136 |
| VCDI |
0 |
3 |
287 |
515 |
674 |
1905 |
29207 |
19718 |
|
...date precedes bulletin
|
Date: 2025-03-04:
| 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 |
60950 |
23331 |
4794 |
965 |
157 |
153 |
78 |
0 |
| OW |
0 |
190 |
2226 |
1027 |
376 |
237 |
66 |
0 |
| VODI |
0 |
53 |
1042 |
1115 |
1025 |
616 |
152 |
0 |
| ODI |
0 |
10 |
412 |
769 |
851 |
962 |
474 |
17 |
| CDI |
0 |
0 |
208 |
570 |
706 |
1150 |
2429 |
254 |
| VCDI |
0 |
0 |
212 |
409 |
642 |
1367 |
27539 |
21310 |
|
...date precedes bulletin
|
Date: 2025-03-06:
| 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 |
62256 |
21472 |
4345 |
1186 |
578 |
255 |
66 |
0 |
| OW |
0 |
524 |
1749 |
784 |
526 |
260 |
55 |
0 |
| VODI |
0 |
98 |
998 |
999 |
865 |
1002 |
188 |
2 |
| ODI |
0 |
44 |
334 |
672 |
785 |
1126 |
389 |
37 |
| CDI |
0 |
12 |
153 |
491 |
808 |
1351 |
1840 |
291 |
| VCDI |
0 |
0 |
179 |
224 |
682 |
2204 |
27556 |
21458 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
62256 |
21515 |
4501 |
1212 |
584 |
261 |
60 |
0 |
| OW |
0 |
468 |
1619 |
768 |
496 |
264 |
53 |
0 |
| VODI |
0 |
101 |
981 |
937 |
826 |
935 |
175 |
3 |
| ODI |
0 |
46 |
317 |
675 |
810 |
1171 |
398 |
47 |
| CDI |
0 |
18 |
136 |
528 |
805 |
1273 |
1769 |
282 |
| VCDI |
0 |
2 |
204 |
236 |
723 |
2294 |
27639 |
21456 |
|
Date: 2025-03-10:
| 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 |
57619 |
23204 |
4542 |
1035 |
509 |
238 |
58 |
0 |
| OW |
0 |
310 |
1699 |
997 |
564 |
392 |
118 |
0 |
| VODI |
0 |
2 |
964 |
904 |
1045 |
1166 |
289 |
0 |
| ODI |
0 |
0 |
342 |
502 |
791 |
1548 |
845 |
0 |
| CDI |
0 |
0 |
123 |
196 |
497 |
1554 |
4037 |
66 |
| VCDI |
0 |
0 |
69 |
53 |
525 |
735 |
26290 |
25016 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
57619 |
23152 |
4286 |
1081 |
580 |
336 |
72 |
0 |
| OW |
0 |
280 |
1850 |
842 |
577 |
459 |
147 |
0 |
| VODI |
0 |
77 |
825 |
880 |
808 |
796 |
464 |
0 |
| ODI |
0 |
7 |
438 |
467 |
771 |
1472 |
1000 |
10 |
| CDI |
0 |
0 |
243 |
304 |
499 |
1621 |
3357 |
127 |
| VCDI |
0 |
0 |
97 |
113 |
696 |
949 |
26597 |
24945 |
|
Date: 2025-03-12:
| 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 |
57042 |
23511 |
3455 |
896 |
595 |
306 |
65 |
0 |
| OW |
0 |
396 |
1280 |
698 |
709 |
468 |
59 |
0 |
| VODI |
0 |
144 |
588 |
718 |
1000 |
1271 |
235 |
0 |
| ODI |
0 |
39 |
230 |
380 |
655 |
2131 |
637 |
30 |
| CDI |
0 |
16 |
112 |
289 |
430 |
2615 |
4146 |
315 |
| VCDI |
0 |
0 |
14 |
79 |
126 |
1433 |
24367 |
27364 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
57042 |
23171 |
3334 |
937 |
673 |
277 |
26 |
0 |
| OW |
0 |
620 |
1140 |
624 |
863 |
579 |
84 |
1 |
| VODI |
0 |
218 |
694 |
662 |
761 |
1318 |
374 |
14 |
| ODI |
0 |
68 |
316 |
441 |
691 |
1891 |
967 |
73 |
| CDI |
0 |
26 |
132 |
276 |
393 |
2698 |
3959 |
385 |
| VCDI |
0 |
3 |
63 |
120 |
134 |
1461 |
24099 |
27236 |
|
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 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
55703 |
23326 |
2838 |
1414 |
503 |
224 |
53 |
0 |
| OW |
0 |
369 |
952 |
1143 |
758 |
442 |
259 |
3 |
| VODI |
0 |
137 |
576 |
881 |
823 |
1078 |
667 |
34 |
| ODI |
0 |
56 |
161 |
527 |
677 |
1305 |
1457 |
88 |
| CDI |
0 |
3 |
84 |
367 |
651 |
1816 |
6410 |
558 |
| VCDI |
0 |
0 |
70 |
321 |
602 |
1366 |
23954 |
26188 |
|
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