Validation of sea ice concentration - Full domain
Bulletin date: 2025-08-28
Data source: OSI SAF N.H. AMSR sea ice concentration
Model vs. observations, sea ice class contingency tables
Date: 2025-08-22:
| 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 |
111350 |
12591 |
81 |
28 |
1 |
0 |
0 |
0 |
| OW |
2780 |
6118 |
1142 |
677 |
11 |
0 |
0 |
0 |
| VODI |
1313 |
625 |
1013 |
4284 |
1393 |
30 |
0 |
0 |
| ODI |
0 |
9 |
27 |
1249 |
10603 |
3550 |
11 |
0 |
| CDI |
0 |
11 |
14 |
106 |
3317 |
10700 |
1252 |
0 |
| VCDI |
0 |
4 |
4 |
14 |
31 |
2522 |
3949 |
0 |
|
...date precedes bulletin
|
Date: 2025-08-24:
| 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 |
110984 |
12962 |
88 |
41 |
0 |
0 |
0 |
0 |
| OW |
2999 |
6511 |
773 |
516 |
16 |
0 |
0 |
0 |
| VODI |
1271 |
1090 |
1170 |
3890 |
1483 |
12 |
0 |
0 |
| ODI |
0 |
19 |
37 |
1558 |
10826 |
3545 |
19 |
0 |
| CDI |
0 |
23 |
14 |
80 |
3564 |
10034 |
670 |
0 |
| VCDI |
0 |
0 |
4 |
16 |
29 |
2679 |
3887 |
0 |
|
...date precedes bulletin
|
Date: 2025-08-26:
| 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 |
114080 |
12814 |
80 |
36 |
0 |
0 |
0 |
0 |
| OW |
2750 |
5493 |
1498 |
828 |
4 |
0 |
0 |
0 |
| VODI |
1185 |
120 |
487 |
4337 |
1469 |
5 |
0 |
0 |
| ODI |
0 |
6 |
0 |
613 |
10458 |
1796 |
0 |
0 |
| CDI |
0 |
13 |
5 |
27 |
3122 |
13285 |
1361 |
0 |
| VCDI |
0 |
0 |
0 |
3 |
19 |
2163 |
2753 |
0 |
|
...date precedes bulletin
|
Date: 2025-08-28:
| 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 |
114439 |
12422 |
77 |
56 |
1 |
0 |
0 |
0 |
| OW |
2855 |
5697 |
1133 |
847 |
9 |
0 |
0 |
0 |
| VODI |
1180 |
294 |
615 |
4248 |
1444 |
33 |
0 |
0 |
| ODI |
0 |
8 |
9 |
851 |
9155 |
2525 |
3 |
0 |
| CDI |
0 |
10 |
2 |
46 |
3426 |
13203 |
683 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
19 |
3973 |
1547 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
114426 |
12900 |
96 |
75 |
2 |
0 |
0 |
0 |
| OW |
2868 |
5191 |
1117 |
905 |
15 |
0 |
0 |
0 |
| VODI |
1180 |
320 |
609 |
4050 |
1482 |
50 |
0 |
0 |
| ODI |
0 |
9 |
12 |
948 |
8885 |
2764 |
4 |
0 |
| CDI |
0 |
11 |
2 |
69 |
3648 |
12894 |
637 |
0 |
| VCDI |
0 |
0 |
0 |
1 |
22 |
4026 |
1592 |
0 |
|
Date: 2025-08-30:
| 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 |
115038 |
11320 |
70 |
48 |
0 |
0 |
0 |
0 |
| OW |
2669 |
6202 |
923 |
766 |
59 |
0 |
0 |
0 |
| VODI |
1327 |
597 |
768 |
3754 |
1614 |
9 |
0 |
0 |
| ODI |
0 |
19 |
19 |
1048 |
9743 |
1692 |
17 |
0 |
| CDI |
0 |
12 |
2 |
43 |
4294 |
13920 |
1093 |
0 |
| VCDI |
0 |
0 |
1 |
1 |
22 |
2767 |
953 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
115080 |
11700 |
89 |
65 |
0 |
0 |
0 |
0 |
| OW |
2759 |
5784 |
899 |
770 |
63 |
0 |
0 |
0 |
| VODI |
1195 |
637 |
773 |
3688 |
1584 |
11 |
0 |
0 |
| ODI |
0 |
17 |
19 |
1072 |
9283 |
2073 |
35 |
0 |
| CDI |
0 |
12 |
2 |
64 |
4778 |
13162 |
1019 |
0 |
| VCDI |
0 |
0 |
1 |
1 |
24 |
3142 |
1009 |
0 |
|
Date: 2025-09-01:
| 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 |
115753 |
13504 |
57 |
17 |
0 |
0 |
0 |
0 |
| OW |
2699 |
4748 |
1408 |
746 |
16 |
0 |
0 |
0 |
| VODI |
1171 |
31 |
238 |
4504 |
1206 |
4 |
0 |
0 |
| ODI |
0 |
4 |
0 |
832 |
12888 |
1631 |
1 |
0 |
| CDI |
0 |
7 |
1 |
18 |
2018 |
12779 |
458 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
10 |
1923 |
2138 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
115691 |
10530 |
57 |
32 |
0 |
0 |
0 |
0 |
| OW |
2745 |
6350 |
589 |
509 |
67 |
9 |
0 |
0 |
| VODI |
1187 |
1349 |
958 |
3587 |
1454 |
37 |
0 |
0 |
| ODI |
0 |
48 |
99 |
1846 |
9156 |
2768 |
30 |
0 |
| CDI |
0 |
17 |
1 |
143 |
5444 |
10349 |
1273 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
17 |
3174 |
1294 |
0 |
|
Date: 2025-09-03:
| 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 |
116065 |
13393 |
45 |
12 |
2 |
0 |
0 |
0 |
| OW |
2751 |
4801 |
1142 |
719 |
38 |
0 |
0 |
0 |
| VODI |
1025 |
188 |
585 |
4418 |
1128 |
8 |
0 |
0 |
| ODI |
0 |
7 |
4 |
1369 |
11658 |
2534 |
16 |
0 |
| CDI |
0 |
8 |
2 |
28 |
1938 |
11644 |
608 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
8 |
2365 |
2301 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
115937 |
10139 |
53 |
29 |
4 |
0 |
0 |
0 |
| OW |
2725 |
6499 |
637 |
514 |
94 |
1 |
0 |
0 |
| VODI |
1179 |
1636 |
923 |
3498 |
1590 |
34 |
0 |
0 |
| ODI |
0 |
105 |
160 |
2224 |
8344 |
2970 |
61 |
0 |
| CDI |
0 |
17 |
5 |
279 |
4696 |
10520 |
1222 |
0 |
| VCDI |
0 |
1 |
0 |
2 |
44 |
3026 |
1642 |
0 |
|
Date: 2025-09-05:
| 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 |
115719 |
13635 |
92 |
39 |
7 |
0 |
0 |
0 |
| OW |
2736 |
4936 |
977 |
669 |
39 |
0 |
0 |
0 |
| VODI |
1026 |
471 |
777 |
4242 |
1278 |
41 |
0 |
0 |
| ODI |
0 |
16 |
16 |
1241 |
10652 |
3208 |
2 |
0 |
| CDI |
0 |
7 |
3 |
18 |
1718 |
11436 |
824 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
15 |
2519 |
2451 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
115588 |
10525 |
120 |
51 |
7 |
0 |
0 |
0 |
| OW |
2696 |
6379 |
656 |
705 |
123 |
1 |
0 |
0 |
| VODI |
1197 |
1879 |
886 |
3242 |
1832 |
138 |
0 |
0 |
| ODI |
0 |
236 |
169 |
1965 |
6991 |
3234 |
41 |
0 |
| CDI |
0 |
46 |
33 |
246 |
4685 |
9946 |
1184 |
0 |
| VCDI |
0 |
0 |
1 |
0 |
71 |
3885 |
2052 |
0 |
|
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