Validation of sea ice concentration - Full domain
Bulletin date: 2025-09-04
Data source: OSI SAF N.H. multi-product sea ice concentration
Model vs. observations, sea ice class contingency tables
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 |
132548 |
11403 |
78 |
61 |
0 |
0 |
0 |
0 |
| OW |
288 |
5569 |
967 |
1238 |
13 |
0 |
0 |
0 |
| VODI |
3 |
301 |
313 |
4783 |
1422 |
1 |
0 |
0 |
| ODI |
0 |
18 |
6 |
403 |
10129 |
1584 |
2 |
0 |
| CDI |
0 |
7 |
0 |
26 |
2997 |
15874 |
395 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
27 |
3526 |
761 |
0 |
|
...date precedes bulletin
|
Date: 2025-08-31:
| 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 |
132804 |
10276 |
43 |
43 |
0 |
0 |
0 |
0 |
| OW |
244 |
6611 |
775 |
741 |
29 |
0 |
0 |
0 |
| VODI |
3 |
531 |
574 |
4941 |
1101 |
2 |
0 |
0 |
| ODI |
0 |
24 |
8 |
821 |
11785 |
1233 |
8 |
0 |
| CDI |
0 |
23 |
1 |
18 |
4876 |
12761 |
584 |
0 |
| VCDI |
0 |
1 |
0 |
0 |
17 |
2509 |
1356 |
0 |
|
...date precedes bulletin
|
Date: 2025-09-02:
| 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 |
133287 |
13337 |
53 |
22 |
0 |
0 |
0 |
0 |
| OW |
101 |
4302 |
1197 |
1372 |
5 |
0 |
0 |
0 |
| VODI |
2 |
95 |
161 |
4612 |
1331 |
3 |
0 |
0 |
| ODI |
0 |
18 |
0 |
336 |
14207 |
1171 |
0 |
0 |
| CDI |
0 |
19 |
0 |
4 |
2127 |
12091 |
342 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
19 |
2499 |
2030 |
0 |
|
...date precedes bulletin
|
Date: 2025-09-04:
| 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 |
134287 |
12315 |
55 |
43 |
0 |
0 |
0 |
0 |
| OW |
359 |
4296 |
1051 |
1046 |
16 |
0 |
0 |
0 |
| VODI |
8 |
208 |
296 |
5032 |
1086 |
21 |
0 |
0 |
| ODI |
0 |
22 |
1 |
395 |
13338 |
1653 |
1 |
0 |
| CDI |
0 |
27 |
0 |
2 |
1954 |
11478 |
958 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
17 |
2215 |
2563 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
134283 |
12293 |
104 |
49 |
0 |
0 |
0 |
0 |
| OW |
360 |
4306 |
1009 |
1145 |
15 |
0 |
0 |
0 |
| VODI |
11 |
219 |
289 |
4913 |
1276 |
22 |
0 |
0 |
| ODI |
0 |
22 |
1 |
409 |
12921 |
1931 |
1 |
0 |
| CDI |
0 |
28 |
0 |
2 |
2187 |
11399 |
1070 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
12 |
2015 |
2451 |
0 |
|
Date: 2025-09-06:
| 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 |
134302 |
12082 |
42 |
27 |
0 |
0 |
0 |
0 |
| OW |
370 |
4482 |
949 |
1004 |
4 |
0 |
0 |
0 |
| VODI |
2 |
284 |
380 |
5289 |
1130 |
43 |
0 |
0 |
| ODI |
0 |
29 |
0 |
449 |
12434 |
1703 |
0 |
0 |
| CDI |
0 |
16 |
4 |
6 |
1775 |
12406 |
450 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
37 |
3450 |
1594 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
134309 |
12200 |
86 |
29 |
0 |
0 |
0 |
0 |
| OW |
363 |
4333 |
923 |
1212 |
5 |
0 |
0 |
0 |
| VODI |
2 |
314 |
362 |
5040 |
1342 |
42 |
0 |
0 |
| ODI |
0 |
32 |
1 |
490 |
11971 |
2185 |
4 |
0 |
| CDI |
0 |
14 |
3 |
4 |
2032 |
12038 |
483 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
30 |
3337 |
1557 |
0 |
|
Date: 2025-09-08:
| 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 |
133631 |
14539 |
93 |
48 |
0 |
0 |
0 |
0 |
| OW |
261 |
3454 |
1142 |
1388 |
4 |
0 |
0 |
0 |
| VODI |
1 |
43 |
85 |
4948 |
1057 |
0 |
0 |
0 |
| ODI |
0 |
4 |
0 |
306 |
8639 |
48 |
0 |
0 |
| CDI |
0 |
0 |
0 |
4 |
4365 |
16258 |
63 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
22 |
2806 |
1534 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
133442 |
12722 |
80 |
59 |
0 |
0 |
0 |
0 |
| OW |
431 |
4729 |
833 |
990 |
19 |
0 |
0 |
0 |
| VODI |
20 |
566 |
405 |
4812 |
1403 |
36 |
0 |
0 |
| ODI |
0 |
18 |
2 |
813 |
10115 |
2469 |
0 |
0 |
| CDI |
0 |
5 |
0 |
20 |
2534 |
12382 |
299 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
16 |
4225 |
1298 |
0 |
|
Date: 2025-09-10:
| 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 |
134624 |
12729 |
88 |
17 |
0 |
0 |
0 |
0 |
| OW |
442 |
3618 |
1024 |
1375 |
13 |
0 |
0 |
0 |
| VODI |
18 |
120 |
178 |
4893 |
1091 |
7 |
0 |
0 |
| ODI |
0 |
11 |
1 |
584 |
6716 |
378 |
0 |
0 |
| CDI |
0 |
2 |
0 |
7 |
4355 |
14885 |
153 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
75 |
5630 |
1709 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
134244 |
10594 |
72 |
18 |
0 |
0 |
0 |
0 |
| OW |
820 |
5200 |
724 |
1099 |
33 |
0 |
0 |
0 |
| VODI |
20 |
657 |
491 |
4540 |
1493 |
96 |
0 |
0 |
| ODI |
0 |
17 |
3 |
1183 |
7509 |
2921 |
2 |
0 |
| CDI |
0 |
12 |
1 |
36 |
3182 |
11958 |
123 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
33 |
5925 |
1737 |
0 |
|
Date: 2025-09-12:
| 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 |
133472 |
12832 |
61 |
27 |
0 |
0 |
0 |
0 |
| OW |
746 |
4053 |
813 |
1256 |
98 |
0 |
0 |
0 |
| VODI |
14 |
197 |
257 |
4656 |
1541 |
39 |
0 |
0 |
| ODI |
0 |
11 |
4 |
370 |
5386 |
949 |
0 |
0 |
| CDI |
0 |
2 |
0 |
5 |
2904 |
13552 |
301 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
18 |
7742 |
3437 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
133258 |
11200 |
60 |
26 |
0 |
0 |
0 |
0 |
| OW |
913 |
5167 |
638 |
1211 |
162 |
5 |
0 |
0 |
| VODI |
60 |
669 |
417 |
4089 |
1834 |
234 |
0 |
0 |
| ODI |
1 |
29 |
20 |
979 |
5704 |
2528 |
3 |
0 |
| CDI |
0 |
30 |
0 |
9 |
2221 |
12016 |
462 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
26 |
7499 |
3273 |
0 |
|
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