Validation of sea ice concentration - European sector
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 |
89809 |
2602 |
18 |
34 |
0 |
0 |
0 |
0 |
| OW |
0 |
429 |
100 |
156 |
9 |
0 |
0 |
0 |
| VODI |
0 |
112 |
75 |
463 |
68 |
1 |
0 |
0 |
| ODI |
0 |
3 |
5 |
141 |
2046 |
384 |
2 |
0 |
| CDI |
0 |
0 |
0 |
0 |
595 |
2808 |
262 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
114 |
180 |
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 |
89716 |
2536 |
13 |
13 |
0 |
0 |
0 |
0 |
| OW |
6 |
611 |
56 |
100 |
5 |
0 |
0 |
0 |
| VODI |
0 |
259 |
157 |
346 |
39 |
2 |
0 |
0 |
| ODI |
0 |
1 |
8 |
347 |
2458 |
104 |
8 |
0 |
| CDI |
0 |
0 |
0 |
5 |
903 |
2094 |
294 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
118 |
217 |
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 |
89741 |
2710 |
15 |
13 |
0 |
0 |
0 |
0 |
| OW |
0 |
715 |
178 |
158 |
2 |
0 |
0 |
0 |
| VODI |
0 |
16 |
45 |
596 |
46 |
3 |
0 |
0 |
| ODI |
0 |
0 |
0 |
197 |
1906 |
611 |
0 |
0 |
| CDI |
0 |
0 |
0 |
1 |
255 |
1853 |
97 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
4 |
298 |
956 |
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 |
89720 |
2793 |
15 |
37 |
0 |
0 |
0 |
0 |
| OW |
0 |
648 |
148 |
175 |
16 |
0 |
0 |
0 |
| VODI |
0 |
24 |
54 |
540 |
76 |
7 |
0 |
0 |
| ODI |
0 |
0 |
0 |
184 |
1904 |
671 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
266 |
1458 |
79 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
405 |
1196 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
89720 |
2700 |
30 |
39 |
0 |
0 |
0 |
0 |
| OW |
0 |
732 |
130 |
196 |
15 |
0 |
0 |
0 |
| VODI |
0 |
33 |
57 |
496 |
75 |
6 |
0 |
0 |
| ODI |
0 |
0 |
0 |
205 |
1796 |
747 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
376 |
1430 |
115 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
358 |
1160 |
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 |
89897 |
2862 |
6 |
22 |
0 |
0 |
0 |
0 |
| OW |
0 |
591 |
130 |
175 |
0 |
0 |
0 |
0 |
| VODI |
0 |
24 |
77 |
506 |
48 |
0 |
0 |
0 |
| ODI |
0 |
0 |
0 |
171 |
1926 |
312 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
306 |
1351 |
210 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
667 |
1135 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
89895 |
2789 |
21 |
15 |
0 |
0 |
0 |
0 |
| OW |
2 |
653 |
114 |
186 |
0 |
0 |
0 |
0 |
| VODI |
0 |
35 |
78 |
461 |
61 |
0 |
0 |
0 |
| ODI |
0 |
0 |
0 |
212 |
1766 |
405 |
4 |
0 |
| CDI |
0 |
0 |
0 |
0 |
453 |
1377 |
241 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
548 |
1100 |
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 |
88746 |
4135 |
36 |
41 |
0 |
0 |
0 |
0 |
| OW |
3 |
428 |
155 |
157 |
2 |
0 |
0 |
0 |
| VODI |
0 |
9 |
23 |
627 |
60 |
0 |
0 |
0 |
| ODI |
0 |
0 |
0 |
64 |
1316 |
12 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
719 |
2303 |
1 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
19 |
749 |
811 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
88742 |
3883 |
35 |
45 |
0 |
0 |
0 |
0 |
| OW |
7 |
617 |
97 |
171 |
10 |
0 |
0 |
0 |
| VODI |
0 |
72 |
82 |
451 |
89 |
0 |
0 |
0 |
| ODI |
0 |
0 |
0 |
222 |
1529 |
218 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
478 |
1956 |
27 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
10 |
890 |
785 |
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 |
89647 |
3154 |
13 |
5 |
0 |
0 |
0 |
0 |
| OW |
5 |
481 |
135 |
127 |
0 |
0 |
0 |
0 |
| VODI |
0 |
56 |
65 |
607 |
61 |
0 |
0 |
0 |
| ODI |
0 |
0 |
0 |
124 |
1084 |
19 |
0 |
0 |
| CDI |
0 |
0 |
0 |
4 |
649 |
2279 |
16 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
71 |
1252 |
562 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
89642 |
2797 |
5 |
6 |
0 |
0 |
0 |
0 |
| OW |
10 |
725 |
72 |
115 |
1 |
0 |
0 |
0 |
| VODI |
0 |
169 |
136 |
412 |
44 |
0 |
0 |
0 |
| ODI |
0 |
0 |
0 |
329 |
1039 |
376 |
2 |
0 |
| CDI |
0 |
0 |
0 |
5 |
762 |
1704 |
5 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
19 |
1470 |
571 |
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 |
88810 |
3831 |
20 |
16 |
0 |
0 |
0 |
0 |
| OW |
8 |
373 |
130 |
258 |
0 |
0 |
0 |
0 |
| VODI |
0 |
30 |
23 |
566 |
199 |
0 |
0 |
0 |
| ODI |
0 |
0 |
0 |
40 |
610 |
298 |
0 |
0 |
| CDI |
0 |
0 |
0 |
3 |
202 |
1917 |
80 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
15 |
1651 |
1336 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
88814 |
3495 |
17 |
15 |
0 |
0 |
0 |
0 |
| OW |
4 |
649 |
85 |
200 |
1 |
0 |
0 |
0 |
| VODI |
0 |
90 |
71 |
540 |
135 |
0 |
0 |
0 |
| ODI |
0 |
0 |
0 |
125 |
728 |
292 |
1 |
0 |
| CDI |
0 |
0 |
0 |
3 |
162 |
1802 |
122 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
1772 |
1293 |
0 |
|
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