Validation of sea ice concentration
Bulletin date: 2025-05-01
Model vs. observations, sea ice class contingency tables
Date: 2025-04-25:
| 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 |
54261 |
22041 |
4770 |
926 |
314 |
101 |
0 |
0 |
| OW |
0 |
192 |
1588 |
875 |
640 |
509 |
99 |
0 |
| VODI |
0 |
8 |
700 |
776 |
606 |
995 |
762 |
20 |
| ODI |
0 |
0 |
136 |
357 |
344 |
967 |
2249 |
107 |
| CDI |
0 |
0 |
26 |
198 |
254 |
1156 |
11266 |
793 |
| VCDI |
0 |
0 |
2 |
19 |
86 |
760 |
23057 |
26884 |
|
...date precedes bulletin
|
Date: 2025-04-29:
| 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 |
54200 |
22425 |
4887 |
1001 |
319 |
71 |
4 |
2 |
| OW |
0 |
112 |
1529 |
1001 |
746 |
248 |
84 |
19 |
| VODI |
0 |
0 |
490 |
998 |
1151 |
746 |
510 |
74 |
| ODI |
0 |
0 |
74 |
183 |
430 |
1003 |
1713 |
290 |
| CDI |
0 |
0 |
9 |
114 |
171 |
1120 |
10273 |
1563 |
| VCDI |
0 |
0 |
0 |
56 |
48 |
209 |
20856 |
29246 |
|
...date precedes bulletin
|
Date: 2025-05-01:
| Best estimate |
Forecast |
|
...observations not yet available
|
...observations not yet available
|
Date: 2025-05-05:
| 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 |
54846 |
23314 |
3315 |
809 |
166 |
62 |
8 |
0 |
| OW |
96 |
447 |
2005 |
1075 |
758 |
308 |
108 |
0 |
| VODI |
26 |
102 |
1234 |
897 |
1082 |
823 |
643 |
4 |
| ODI |
14 |
19 |
567 |
667 |
723 |
1335 |
2943 |
48 |
| CDI |
8 |
2 |
199 |
625 |
660 |
1177 |
15614 |
1926 |
| VCDI |
0 |
0 |
1 |
176 |
165 |
309 |
22739 |
16799 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
54844 |
23273 |
3123 |
732 |
175 |
37 |
8 |
0 |
| OW |
95 |
484 |
2109 |
1116 |
738 |
337 |
67 |
0 |
| VODI |
27 |
109 |
1319 |
946 |
1085 |
930 |
644 |
4 |
| ODI |
19 |
16 |
600 |
646 |
736 |
1277 |
3488 |
37 |
| CDI |
5 |
2 |
162 |
621 |
654 |
1101 |
14013 |
1395 |
| VCDI |
0 |
0 |
8 |
188 |
166 |
332 |
23835 |
17341 |
|
Date: 2025-05-07:
| 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 |
55248 |
23822 |
3784 |
483 |
107 |
36 |
41 |
0 |
| OW |
100 |
497 |
2263 |
1391 |
582 |
229 |
170 |
0 |
| VODI |
9 |
46 |
1094 |
1417 |
1025 |
774 |
949 |
16 |
| ODI |
5 |
2 |
169 |
853 |
964 |
1457 |
3480 |
87 |
| CDI |
0 |
2 |
58 |
513 |
656 |
884 |
16950 |
809 |
| VCDI |
0 |
0 |
2 |
116 |
196 |
165 |
20977 |
16416 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
55214 |
23376 |
2656 |
543 |
197 |
60 |
45 |
0 |
| OW |
106 |
857 |
2283 |
1051 |
499 |
323 |
238 |
1 |
| VODI |
28 |
132 |
1443 |
1121 |
940 |
836 |
1022 |
25 |
| ODI |
10 |
2 |
675 |
902 |
799 |
1244 |
4172 |
99 |
| CDI |
4 |
2 |
306 |
965 |
763 |
698 |
14982 |
1117 |
| VCDI |
0 |
0 |
7 |
191 |
332 |
384 |
22108 |
16086 |
|
Date: 2025-05-09:
| Best estimate |
Forecast |
|
...observations not yet available
|
...observations not yet available
|
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