Validation of sea ice concentration - European sector
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 |
87178 |
3994 |
25 |
6 |
0 |
0 |
0 |
0 |
| OW |
2475 |
465 |
134 |
131 |
1 |
0 |
0 |
0 |
| VODI |
1305 |
29 |
68 |
338 |
189 |
6 |
0 |
0 |
| ODI |
0 |
0 |
2 |
85 |
1563 |
831 |
9 |
0 |
| CDI |
0 |
0 |
0 |
3 |
482 |
1931 |
606 |
0 |
| VCDI |
0 |
0 |
0 |
3 |
7 |
206 |
790 |
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 |
86982 |
4166 |
30 |
20 |
0 |
0 |
0 |
0 |
| OW |
2539 |
501 |
90 |
101 |
11 |
0 |
0 |
0 |
| VODI |
1271 |
59 |
96 |
305 |
191 |
1 |
0 |
0 |
| ODI |
0 |
0 |
2 |
104 |
1684 |
729 |
15 |
0 |
| CDI |
0 |
0 |
0 |
0 |
464 |
1996 |
399 |
0 |
| VCDI |
0 |
0 |
0 |
2 |
9 |
59 |
1036 |
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 |
87995 |
3377 |
28 |
12 |
0 |
0 |
0 |
0 |
| OW |
2577 |
362 |
132 |
101 |
3 |
0 |
0 |
0 |
| VODI |
1183 |
13 |
64 |
348 |
122 |
1 |
0 |
0 |
| ODI |
0 |
0 |
0 |
93 |
1926 |
422 |
0 |
0 |
| CDI |
0 |
0 |
1 |
11 |
570 |
2389 |
255 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
5 |
179 |
693 |
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 |
87972 |
3298 |
26 |
21 |
1 |
0 |
0 |
0 |
| OW |
2582 |
395 |
125 |
121 |
2 |
0 |
0 |
0 |
| VODI |
1178 |
48 |
93 |
356 |
133 |
4 |
0 |
0 |
| ODI |
0 |
0 |
3 |
89 |
1794 |
643 |
3 |
0 |
| CDI |
0 |
0 |
1 |
18 |
801 |
2354 |
337 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
167 |
297 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
87972 |
3245 |
29 |
30 |
2 |
0 |
0 |
0 |
| OW |
2582 |
435 |
110 |
102 |
4 |
0 |
0 |
0 |
| VODI |
1178 |
60 |
105 |
364 |
139 |
4 |
0 |
0 |
| ODI |
0 |
1 |
3 |
91 |
1548 |
452 |
4 |
0 |
| CDI |
0 |
0 |
1 |
18 |
1035 |
2589 |
338 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
3 |
123 |
295 |
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 |
88463 |
2561 |
19 |
24 |
0 |
0 |
0 |
0 |
| OW |
2500 |
542 |
71 |
101 |
11 |
0 |
0 |
0 |
| VODI |
1325 |
187 |
148 |
339 |
88 |
4 |
0 |
0 |
| ODI |
0 |
0 |
5 |
205 |
2007 |
511 |
11 |
0 |
| CDI |
0 |
0 |
0 |
11 |
742 |
2112 |
591 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
31 |
253 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
88525 |
2528 |
20 |
34 |
0 |
0 |
0 |
0 |
| OW |
2568 |
549 |
69 |
87 |
12 |
0 |
0 |
0 |
| VODI |
1195 |
211 |
146 |
352 |
97 |
3 |
0 |
0 |
| ODI |
0 |
2 |
8 |
196 |
1655 |
460 |
17 |
0 |
| CDI |
0 |
0 |
0 |
11 |
1084 |
2119 |
563 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
76 |
275 |
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 |
88534 |
2639 |
20 |
10 |
0 |
0 |
0 |
0 |
| OW |
2635 |
692 |
199 |
128 |
7 |
0 |
0 |
0 |
| VODI |
1171 |
4 |
41 |
549 |
109 |
3 |
0 |
0 |
| ODI |
0 |
0 |
0 |
163 |
2232 |
272 |
1 |
0 |
| CDI |
0 |
0 |
0 |
13 |
548 |
1657 |
122 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
177 |
936 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
88577 |
2396 |
20 |
12 |
0 |
0 |
0 |
0 |
| OW |
2576 |
593 |
73 |
91 |
15 |
1 |
0 |
0 |
| VODI |
1187 |
331 |
140 |
303 |
61 |
5 |
0 |
0 |
| ODI |
0 |
15 |
27 |
417 |
1538 |
477 |
30 |
0 |
| CDI |
0 |
0 |
0 |
40 |
1279 |
1490 |
742 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
3 |
136 |
287 |
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 |
88709 |
2569 |
21 |
6 |
2 |
0 |
0 |
0 |
| OW |
2711 |
695 |
171 |
125 |
25 |
0 |
0 |
0 |
| VODI |
1025 |
29 |
78 |
504 |
86 |
0 |
0 |
0 |
| ODI |
0 |
0 |
3 |
341 |
1814 |
585 |
16 |
0 |
| CDI |
0 |
0 |
0 |
18 |
309 |
1456 |
110 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
3 |
241 |
1210 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
88669 |
2196 |
16 |
5 |
3 |
0 |
0 |
0 |
| OW |
2597 |
693 |
92 |
65 |
26 |
0 |
0 |
0 |
| VODI |
1179 |
377 |
123 |
301 |
71 |
1 |
0 |
0 |
| ODI |
0 |
27 |
42 |
519 |
1215 |
627 |
54 |
0 |
| CDI |
0 |
0 |
0 |
103 |
912 |
1488 |
663 |
0 |
| VCDI |
0 |
0 |
0 |
1 |
12 |
166 |
619 |
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 |
88716 |
2697 |
33 |
15 |
7 |
0 |
0 |
0 |
| OW |
2710 |
646 |
161 |
107 |
26 |
0 |
0 |
0 |
| VODI |
1026 |
48 |
81 |
424 |
112 |
1 |
0 |
0 |
| ODI |
0 |
0 |
4 |
233 |
1692 |
652 |
2 |
0 |
| CDI |
0 |
0 |
0 |
7 |
227 |
1354 |
183 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
5 |
510 |
1183 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
88663 |
2161 |
19 |
2 |
4 |
0 |
0 |
0 |
| OW |
2592 |
801 |
81 |
66 |
36 |
0 |
0 |
0 |
| VODI |
1197 |
395 |
131 |
248 |
76 |
0 |
0 |
0 |
| ODI |
0 |
34 |
48 |
439 |
1148 |
552 |
41 |
0 |
| CDI |
0 |
0 |
0 |
31 |
800 |
1714 |
535 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
5 |
251 |
792 |
0 |
|
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