Validation of sea ice concentration - European sector
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 |
87339 |
3389 |
37 |
15 |
2 |
0 |
0 |
0 |
| OW |
2340 |
1106 |
161 |
173 |
36 |
7 |
0 |
0 |
| VODI |
1532 |
15 |
51 |
257 |
237 |
19 |
0 |
0 |
| ODI |
0 |
0 |
0 |
69 |
2711 |
352 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
545 |
2111 |
36 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
208 |
114 |
0 |
|
...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 |
87252 |
3501 |
23 |
11 |
2 |
0 |
0 |
0 |
| OW |
2374 |
1029 |
129 |
161 |
38 |
8 |
0 |
0 |
| VODI |
1497 |
26 |
65 |
319 |
250 |
25 |
0 |
0 |
| ODI |
0 |
0 |
1 |
75 |
2607 |
542 |
1 |
0 |
| CDI |
0 |
0 |
0 |
0 |
214 |
1669 |
344 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
477 |
222 |
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 |
87411 |
3858 |
32 |
6 |
0 |
0 |
0 |
0 |
| OW |
2457 |
429 |
162 |
102 |
6 |
0 |
0 |
0 |
| VODI |
1359 |
1 |
39 |
335 |
130 |
6 |
0 |
0 |
| ODI |
0 |
0 |
0 |
67 |
2608 |
466 |
1 |
0 |
| CDI |
0 |
0 |
0 |
0 |
204 |
1861 |
296 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
62 |
964 |
0 |
|
...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 |
87441 |
3785 |
28 |
13 |
0 |
0 |
0 |
0 |
| OW |
2463 |
491 |
132 |
87 |
5 |
0 |
0 |
0 |
| VODI |
1323 |
17 |
66 |
316 |
167 |
5 |
0 |
0 |
| ODI |
0 |
0 |
0 |
80 |
1782 |
663 |
3 |
0 |
| CDI |
0 |
0 |
0 |
1 |
284 |
2045 |
668 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
9 |
110 |
878 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
87442 |
3785 |
37 |
18 |
0 |
0 |
0 |
0 |
| OW |
2461 |
492 |
123 |
86 |
7 |
0 |
0 |
0 |
| VODI |
1324 |
16 |
65 |
309 |
156 |
8 |
0 |
0 |
| ODI |
0 |
0 |
1 |
83 |
1760 |
606 |
6 |
0 |
| CDI |
0 |
0 |
0 |
1 |
318 |
2105 |
692 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
6 |
104 |
851 |
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 |
87937 |
3194 |
47 |
15 |
0 |
0 |
0 |
0 |
| OW |
2525 |
466 |
125 |
112 |
2 |
0 |
0 |
0 |
| VODI |
1282 |
44 |
64 |
342 |
194 |
6 |
0 |
0 |
| ODI |
0 |
0 |
2 |
95 |
1709 |
913 |
8 |
0 |
| CDI |
0 |
0 |
0 |
0 |
409 |
1802 |
474 |
0 |
| VCDI |
0 |
0 |
0 |
3 |
6 |
28 |
1053 |
5 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
87940 |
3225 |
54 |
23 |
0 |
0 |
0 |
0 |
| OW |
2522 |
434 |
107 |
113 |
10 |
0 |
0 |
0 |
| VODI |
1282 |
45 |
74 |
337 |
173 |
8 |
0 |
0 |
| ODI |
0 |
0 |
3 |
89 |
1503 |
913 |
6 |
0 |
| CDI |
0 |
0 |
0 |
2 |
629 |
1809 |
532 |
0 |
| VCDI |
0 |
0 |
0 |
3 |
5 |
19 |
997 |
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 |
87980 |
3407 |
23 |
13 |
0 |
0 |
0 |
0 |
| OW |
2572 |
353 |
141 |
107 |
5 |
0 |
0 |
0 |
| VODI |
1191 |
2 |
33 |
364 |
127 |
1 |
0 |
0 |
| ODI |
0 |
0 |
0 |
68 |
1992 |
286 |
0 |
0 |
| CDI |
0 |
0 |
0 |
5 |
409 |
2524 |
155 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
4 |
79 |
1021 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
87947 |
3202 |
18 |
18 |
0 |
0 |
0 |
0 |
| OW |
2542 |
465 |
80 |
95 |
17 |
0 |
0 |
0 |
| VODI |
1254 |
92 |
95 |
327 |
172 |
6 |
0 |
0 |
| ODI |
0 |
3 |
4 |
109 |
1812 |
493 |
44 |
0 |
| CDI |
0 |
0 |
0 |
5 |
528 |
2332 |
267 |
0 |
| VCDI |
0 |
0 |
0 |
3 |
8 |
59 |
865 |
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 |
87954 |
3387 |
27 |
18 |
0 |
0 |
0 |
0 |
| OW |
2582 |
366 |
125 |
123 |
5 |
0 |
0 |
0 |
| VODI |
1178 |
24 |
69 |
358 |
126 |
3 |
0 |
0 |
| ODI |
0 |
0 |
1 |
115 |
1993 |
334 |
1 |
0 |
| CDI |
0 |
0 |
2 |
9 |
767 |
2221 |
428 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
4 |
76 |
566 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
87933 |
3119 |
23 |
28 |
0 |
0 |
0 |
0 |
| OW |
2542 |
499 |
77 |
98 |
27 |
0 |
0 |
0 |
| VODI |
1239 |
156 |
105 |
336 |
151 |
17 |
0 |
0 |
| ODI |
0 |
3 |
17 |
149 |
1836 |
388 |
77 |
0 |
| CDI |
0 |
0 |
2 |
12 |
877 |
2072 |
339 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
4 |
157 |
579 |
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 |
88438 |
2683 |
33 |
18 |
0 |
0 |
0 |
0 |
| OW |
2501 |
468 |
117 |
93 |
6 |
0 |
0 |
0 |
| VODI |
1324 |
145 |
124 |
329 |
111 |
1 |
0 |
0 |
| ODI |
0 |
2 |
7 |
152 |
1991 |
409 |
7 |
0 |
| CDI |
0 |
0 |
0 |
21 |
802 |
2431 |
366 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
85 |
198 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
88485 |
2458 |
19 |
15 |
1 |
0 |
0 |
0 |
| OW |
2534 |
544 |
107 |
105 |
9 |
0 |
0 |
0 |
| VODI |
1244 |
270 |
137 |
303 |
161 |
2 |
0 |
0 |
| ODI |
0 |
26 |
18 |
169 |
1712 |
389 |
64 |
0 |
| CDI |
0 |
0 |
0 |
19 |
1010 |
2020 |
75 |
0 |
| VCDI |
0 |
0 |
0 |
2 |
17 |
515 |
432 |
0 |
|
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