Validation of sea ice concentration - Full domain
Bulletin date: 2025-08-21
Data source: OSI SAF N.H. AMSR sea ice concentration
Model vs. observations, sea ice class contingency tables
Date: 2025-08-15:
| 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 |
108185 |
12709 |
135 |
60 |
5 |
0 |
0 |
0 |
| OW |
2728 |
5607 |
928 |
564 |
46 |
9 |
0 |
0 |
| VODI |
1539 |
700 |
1110 |
5296 |
931 |
29 |
0 |
0 |
| ODI |
0 |
10 |
17 |
1266 |
11035 |
1406 |
0 |
0 |
| CDI |
0 |
3 |
1 |
36 |
3928 |
14157 |
1599 |
0 |
| VCDI |
0 |
4 |
1 |
3 |
50 |
1728 |
4672 |
313 |
|
...date precedes bulletin
|
Date: 2025-08-17:
| 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 |
109005 |
11953 |
94 |
35 |
4 |
0 |
0 |
0 |
| OW |
2685 |
5976 |
764 |
481 |
50 |
9 |
0 |
0 |
| VODI |
1497 |
1309 |
1336 |
4780 |
1176 |
50 |
0 |
0 |
| ODI |
0 |
21 |
45 |
1377 |
11400 |
1466 |
4 |
0 |
| CDI |
0 |
1 |
4 |
77 |
4939 |
11367 |
1337 |
0 |
| VCDI |
0 |
2 |
2 |
1 |
60 |
1418 |
6085 |
0 |
|
...date precedes bulletin
|
Date: 2025-08-19:
| 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 |
110549 |
13056 |
128 |
24 |
0 |
0 |
0 |
0 |
| OW |
2765 |
5315 |
1522 |
823 |
15 |
1 |
0 |
0 |
| VODI |
1372 |
143 |
632 |
4849 |
1329 |
14 |
0 |
0 |
| ODI |
0 |
2 |
3 |
702 |
13174 |
2756 |
1 |
0 |
| CDI |
0 |
4 |
4 |
45 |
2380 |
10890 |
891 |
0 |
| VCDI |
0 |
0 |
2 |
7 |
23 |
2388 |
4919 |
82 |
|
...date precedes bulletin
|
Date: 2025-08-21:
| 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 |
111642 |
12310 |
59 |
26 |
0 |
0 |
0 |
0 |
| OW |
2744 |
6219 |
1091 |
546 |
7 |
0 |
0 |
0 |
| VODI |
1337 |
544 |
1040 |
4275 |
1234 |
14 |
0 |
0 |
| ODI |
0 |
10 |
21 |
1049 |
11195 |
3481 |
8 |
0 |
| CDI |
0 |
5 |
8 |
97 |
3072 |
9955 |
2079 |
0 |
| VCDI |
0 |
2 |
6 |
10 |
30 |
1560 |
5134 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
111599 |
13021 |
103 |
39 |
0 |
0 |
0 |
0 |
| OW |
2785 |
5496 |
1121 |
674 |
17 |
0 |
0 |
0 |
| VODI |
1339 |
557 |
966 |
4166 |
1431 |
28 |
0 |
0 |
| ODI |
0 |
8 |
21 |
1025 |
10661 |
3049 |
6 |
0 |
| CDI |
0 |
6 |
8 |
89 |
3398 |
10403 |
2065 |
0 |
| VCDI |
0 |
2 |
6 |
10 |
31 |
1530 |
5150 |
0 |
|
Date: 2025-08-23:
| 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 |
112356 |
11573 |
100 |
33 |
1 |
0 |
0 |
0 |
| OW |
2922 |
6426 |
899 |
531 |
13 |
0 |
0 |
0 |
| VODI |
1286 |
950 |
1090 |
3967 |
1509 |
29 |
0 |
0 |
| ODI |
0 |
17 |
32 |
1441 |
10801 |
3422 |
10 |
0 |
| CDI |
0 |
21 |
21 |
111 |
3168 |
10521 |
995 |
0 |
| VCDI |
0 |
4 |
5 |
15 |
23 |
1838 |
4675 |
5 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
112347 |
12221 |
115 |
49 |
3 |
0 |
0 |
0 |
| OW |
2929 |
5800 |
962 |
661 |
38 |
0 |
0 |
0 |
| VODI |
1288 |
925 |
1008 |
3936 |
1788 |
39 |
0 |
0 |
| ODI |
0 |
19 |
35 |
1315 |
9858 |
3019 |
6 |
0 |
| CDI |
0 |
22 |
22 |
121 |
3804 |
10857 |
1031 |
0 |
| VCDI |
0 |
4 |
5 |
16 |
24 |
1895 |
4643 |
5 |
|
Date: 2025-08-25:
| 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 |
112853 |
13993 |
75 |
34 |
0 |
0 |
0 |
0 |
| OW |
2743 |
5366 |
1704 |
862 |
8 |
0 |
0 |
0 |
| VODI |
1194 |
24 |
220 |
4769 |
1250 |
1 |
0 |
0 |
| ODI |
0 |
10 |
5 |
594 |
11441 |
1027 |
0 |
0 |
| CDI |
0 |
14 |
6 |
29 |
2694 |
13409 |
425 |
0 |
| VCDI |
0 |
0 |
0 |
2 |
16 |
2540 |
3502 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
112545 |
11837 |
66 |
49 |
0 |
0 |
0 |
0 |
| OW |
2988 |
6196 |
752 |
638 |
45 |
0 |
0 |
0 |
| VODI |
1257 |
1282 |
1094 |
3921 |
1828 |
44 |
0 |
0 |
| ODI |
0 |
49 |
80 |
1565 |
9574 |
3135 |
56 |
0 |
| CDI |
0 |
43 |
14 |
96 |
3925 |
10573 |
711 |
0 |
| VCDI |
0 |
0 |
4 |
21 |
37 |
3225 |
3160 |
0 |
|
Date: 2025-08-27:
| 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 |
114100 |
12756 |
69 |
43 |
1 |
0 |
0 |
0 |
| OW |
2764 |
5659 |
1312 |
859 |
14 |
0 |
0 |
0 |
| VODI |
1180 |
183 |
512 |
4184 |
1574 |
32 |
0 |
0 |
| ODI |
0 |
6 |
5 |
679 |
9989 |
2139 |
1 |
0 |
| CDI |
0 |
13 |
5 |
32 |
3317 |
13301 |
1136 |
0 |
| VCDI |
0 |
0 |
0 |
6 |
17 |
2971 |
1951 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
113830 |
10288 |
62 |
66 |
0 |
0 |
0 |
0 |
| OW |
2971 |
6412 |
693 |
686 |
67 |
1 |
0 |
0 |
| VODI |
1243 |
1775 |
1034 |
3338 |
1986 |
151 |
0 |
0 |
| ODI |
0 |
100 |
102 |
1562 |
8810 |
4312 |
134 |
0 |
| CDI |
0 |
38 |
12 |
143 |
4015 |
10116 |
822 |
0 |
| VCDI |
0 |
4 |
0 |
8 |
34 |
3863 |
2132 |
0 |
|
Date: 2025-08-29:
| 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 |
115122 |
11580 |
102 |
38 |
0 |
0 |
0 |
0 |
| OW |
2712 |
5998 |
969 |
738 |
35 |
0 |
0 |
0 |
| VODI |
1325 |
526 |
771 |
3775 |
1648 |
22 |
0 |
0 |
| ODI |
0 |
13 |
15 |
902 |
9242 |
1905 |
7 |
0 |
| CDI |
0 |
11 |
1 |
50 |
3951 |
14422 |
720 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
22 |
3103 |
1085 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
114829 |
9066 |
90 |
34 |
2 |
0 |
0 |
0 |
| OW |
3086 |
6494 |
622 |
786 |
115 |
0 |
0 |
0 |
| VODI |
1244 |
2310 |
972 |
2829 |
2162 |
389 |
0 |
0 |
| ODI |
0 |
214 |
172 |
1568 |
8599 |
3998 |
74 |
0 |
| CDI |
0 |
44 |
2 |
282 |
3982 |
9589 |
447 |
0 |
| VCDI |
0 |
0 |
0 |
4 |
38 |
5476 |
1291 |
0 |
|
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