Validation of sea ice concentration
Bulletin date: 2025-02-20
Model vs. observations, sea ice class contingency tables
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 |
|
...date precedes bulletin
|
Date: 2025-02-18:
| 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 |
57837 |
23383 |
3115 |
560 |
139 |
27 |
0 |
0 |
| OW |
0 |
258 |
1778 |
905 |
338 |
160 |
4 |
0 |
| VODI |
0 |
21 |
794 |
1201 |
909 |
754 |
100 |
0 |
| ODI |
0 |
0 |
106 |
518 |
990 |
1610 |
758 |
61 |
| CDI |
0 |
0 |
53 |
166 |
428 |
1964 |
4501 |
443 |
| VCDI |
0 |
0 |
59 |
79 |
171 |
1128 |
25874 |
27652 |
|
...date precedes bulletin
|
Date: 2025-02-20:
| 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 |
57103 |
23051 |
3535 |
765 |
340 |
45 |
0 |
0 |
| OW |
0 |
144 |
1345 |
1049 |
711 |
208 |
11 |
0 |
| VODI |
0 |
32 |
354 |
994 |
1273 |
739 |
217 |
0 |
| ODI |
0 |
12 |
77 |
387 |
1110 |
1395 |
644 |
1 |
| CDI |
0 |
7 |
44 |
208 |
575 |
2134 |
4359 |
24 |
| VCDI |
0 |
0 |
6 |
213 |
461 |
2876 |
32229 |
20166 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
57103 |
23045 |
3574 |
731 |
342 |
49 |
1 |
0 |
| OW |
0 |
150 |
1294 |
1086 |
685 |
209 |
8 |
0 |
| VODI |
0 |
31 |
360 |
998 |
1283 |
721 |
237 |
0 |
| ODI |
0 |
13 |
86 |
353 |
1098 |
1358 |
671 |
1 |
| CDI |
0 |
7 |
41 |
218 |
573 |
2151 |
4581 |
23 |
| VCDI |
0 |
0 |
6 |
230 |
489 |
2909 |
31962 |
20167 |
|
Date: 2025-02-24:
| 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 |
59857 |
24038 |
2520 |
676 |
137 |
31 |
4 |
0 |
| OW |
0 |
727 |
1910 |
1131 |
423 |
141 |
49 |
0 |
| VODI |
0 |
49 |
928 |
1252 |
1116 |
651 |
267 |
2 |
| ODI |
0 |
0 |
213 |
768 |
577 |
953 |
839 |
9 |
| CDI |
0 |
0 |
86 |
507 |
417 |
960 |
5257 |
93 |
| VCDI |
0 |
0 |
46 |
305 |
322 |
952 |
28057 |
22574 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
59857 |
23909 |
2281 |
557 |
101 |
31 |
3 |
0 |
| OW |
0 |
562 |
1466 |
762 |
293 |
106 |
30 |
0 |
| VODI |
0 |
209 |
1051 |
1217 |
669 |
293 |
164 |
2 |
| ODI |
0 |
105 |
415 |
876 |
719 |
814 |
655 |
10 |
| CDI |
0 |
29 |
374 |
764 |
788 |
1328 |
4481 |
67 |
| VCDI |
0 |
0 |
116 |
463 |
422 |
1116 |
29140 |
22599 |
|
Date: 2025-02-26:
| 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 |
60243 |
23653 |
3708 |
577 |
98 |
34 |
5 |
0 |
| OW |
0 |
380 |
2258 |
1117 |
380 |
120 |
38 |
0 |
| VODI |
0 |
76 |
1015 |
1261 |
952 |
667 |
98 |
0 |
| ODI |
0 |
21 |
391 |
748 |
555 |
1022 |
352 |
3 |
| CDI |
0 |
13 |
257 |
652 |
792 |
1487 |
3014 |
101 |
| VCDI |
0 |
0 |
261 |
695 |
678 |
1394 |
29861 |
19867 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
60243 |
23272 |
2831 |
431 |
97 |
47 |
8 |
0 |
| OW |
0 |
529 |
2031 |
701 |
204 |
49 |
10 |
0 |
| VODI |
0 |
197 |
1523 |
1329 |
581 |
303 |
74 |
0 |
| ODI |
0 |
58 |
636 |
924 |
788 |
851 |
276 |
22 |
| CDI |
0 |
43 |
437 |
904 |
1099 |
1967 |
2521 |
128 |
| VCDI |
0 |
44 |
432 |
761 |
686 |
1507 |
30479 |
19821 |
|
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 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
60807 |
22789 |
2909 |
452 |
187 |
52 |
28 |
0 |
| OW |
0 |
998 |
1711 |
634 |
262 |
110 |
63 |
0 |
| VODI |
0 |
411 |
1525 |
1275 |
612 |
426 |
151 |
3 |
| ODI |
0 |
105 |
775 |
948 |
780 |
760 |
359 |
15 |
| CDI |
0 |
77 |
528 |
847 |
958 |
1848 |
2163 |
143 |
| VCDI |
0 |
42 |
386 |
623 |
806 |
1789 |
29787 |
19700 |
|
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