Validation of sea ice concentration - European sector
Bulletin date: 2025-09-25
Data source: OSI SAF N.H. AMSR sea ice concentration
Model vs. observations, sea ice class contingency tables
Date: 2025-09-19:
| 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 |
87574 |
3437 |
87 |
53 |
0 |
0 |
0 |
0 |
| OW |
2299 |
191 |
81 |
109 |
69 |
9 |
0 |
0 |
| VODI |
1517 |
4 |
36 |
163 |
215 |
58 |
0 |
0 |
| ODI |
0 |
0 |
0 |
11 |
241 |
116 |
0 |
0 |
| CDI |
0 |
0 |
0 |
1 |
90 |
1053 |
416 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
1 |
1937 |
2734 |
360 |
|
...date precedes bulletin
|
Date: 2025-09-21:
| 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 |
87974 |
2894 |
104 |
61 |
7 |
0 |
0 |
0 |
| OW |
2252 |
229 |
82 |
84 |
66 |
12 |
0 |
0 |
| VODI |
1569 |
9 |
42 |
202 |
172 |
70 |
0 |
0 |
| ODI |
0 |
0 |
0 |
8 |
252 |
99 |
4 |
0 |
| CDI |
0 |
0 |
0 |
8 |
112 |
712 |
221 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
2 |
685 |
4194 |
736 |
|
...date precedes bulletin
|
Date: 2025-09-23:
| 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 |
88231 |
2896 |
42 |
15 |
0 |
0 |
0 |
0 |
| OW |
2175 |
250 |
111 |
89 |
13 |
0 |
0 |
0 |
| VODI |
1668 |
2 |
12 |
203 |
146 |
16 |
0 |
0 |
| ODI |
0 |
0 |
0 |
33 |
205 |
82 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
202 |
450 |
41 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
19 |
651 |
4086 |
1224 |
|
...date precedes bulletin
|
Date: 2025-09-25:
| 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 |
88164 |
2904 |
18 |
16 |
0 |
0 |
0 |
0 |
| OW |
2056 |
250 |
93 |
101 |
29 |
0 |
0 |
0 |
| VODI |
1853 |
21 |
45 |
150 |
141 |
10 |
0 |
0 |
| ODI |
0 |
2 |
6 |
62 |
181 |
100 |
0 |
0 |
| CDI |
0 |
0 |
0 |
3 |
208 |
511 |
88 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
24 |
1083 |
4397 |
346 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
88164 |
2876 |
16 |
17 |
1 |
0 |
0 |
0 |
| OW |
2057 |
274 |
91 |
88 |
26 |
0 |
0 |
0 |
| VODI |
1852 |
25 |
49 |
158 |
147 |
10 |
0 |
0 |
| ODI |
0 |
2 |
6 |
63 |
178 |
98 |
0 |
0 |
| CDI |
0 |
0 |
0 |
6 |
215 |
571 |
147 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
16 |
1025 |
4338 |
346 |
|
Date: 2025-09-27:
| 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 |
88222 |
2809 |
21 |
19 |
0 |
0 |
0 |
0 |
| OW |
2069 |
311 |
77 |
85 |
38 |
0 |
0 |
0 |
| VODI |
1794 |
52 |
61 |
150 |
107 |
26 |
0 |
0 |
| ODI |
0 |
4 |
18 |
80 |
151 |
96 |
1 |
0 |
| CDI |
0 |
0 |
0 |
19 |
269 |
582 |
23 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
24 |
1256 |
4339 |
159 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
88222 |
2782 |
23 |
15 |
1 |
0 |
0 |
0 |
| OW |
2076 |
339 |
74 |
87 |
34 |
0 |
0 |
0 |
| VODI |
1787 |
51 |
64 |
154 |
111 |
18 |
0 |
0 |
| ODI |
0 |
4 |
16 |
74 |
143 |
97 |
1 |
0 |
| CDI |
0 |
0 |
0 |
23 |
287 |
643 |
61 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
13 |
1202 |
4301 |
159 |
|
Date: 2025-09-29:
| 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 |
87992 |
2888 |
28 |
16 |
2 |
0 |
0 |
0 |
| OW |
1965 |
237 |
92 |
80 |
21 |
0 |
0 |
0 |
| VODI |
1910 |
10 |
40 |
229 |
75 |
0 |
0 |
0 |
| ODI |
0 |
0 |
0 |
63 |
207 |
15 |
0 |
0 |
| CDI |
0 |
0 |
0 |
3 |
208 |
793 |
80 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
1 |
935 |
4660 |
312 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
87994 |
2751 |
26 |
11 |
0 |
0 |
0 |
0 |
| OW |
2014 |
335 |
85 |
116 |
34 |
0 |
0 |
0 |
| VODI |
1859 |
44 |
43 |
199 |
135 |
18 |
7 |
0 |
| ODI |
0 |
5 |
6 |
55 |
163 |
85 |
21 |
0 |
| CDI |
0 |
0 |
0 |
10 |
172 |
689 |
116 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
10 |
951 |
4596 |
312 |
|
Date: 2025-10-01:
| 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 |
87747 |
2938 |
61 |
22 |
0 |
0 |
0 |
0 |
| OW |
1942 |
147 |
86 |
134 |
41 |
0 |
0 |
0 |
| VODI |
1948 |
11 |
26 |
104 |
193 |
22 |
0 |
0 |
| ODI |
0 |
2 |
5 |
23 |
99 |
117 |
1 |
0 |
| CDI |
0 |
1 |
2 |
14 |
75 |
459 |
94 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
5 |
793 |
5378 |
372 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
87761 |
2799 |
35 |
10 |
0 |
0 |
0 |
0 |
| OW |
1973 |
256 |
97 |
149 |
78 |
4 |
0 |
0 |
| VODI |
1903 |
37 |
32 |
103 |
206 |
51 |
3 |
0 |
| ODI |
0 |
6 |
10 |
20 |
78 |
159 |
9 |
0 |
| CDI |
0 |
1 |
6 |
15 |
43 |
423 |
170 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
8 |
754 |
5291 |
372 |
|
Date: 2025-10-03:
| 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 |
87929 |
2937 |
16 |
4 |
0 |
0 |
0 |
0 |
| OW |
1904 |
269 |
58 |
86 |
6 |
0 |
0 |
0 |
| VODI |
1991 |
85 |
32 |
90 |
109 |
4 |
0 |
0 |
| ODI |
0 |
30 |
16 |
32 |
71 |
48 |
7 |
0 |
| CDI |
0 |
9 |
26 |
64 |
103 |
341 |
31 |
0 |
| VCDI |
0 |
0 |
0 |
7 |
154 |
3035 |
3072 |
296 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
87935 |
2737 |
2 |
1 |
0 |
0 |
0 |
0 |
| OW |
1946 |
444 |
53 |
51 |
17 |
1 |
0 |
0 |
| VODI |
1943 |
103 |
58 |
123 |
93 |
3 |
0 |
0 |
| ODI |
0 |
33 |
14 |
46 |
102 |
61 |
13 |
0 |
| CDI |
0 |
13 |
21 |
40 |
76 |
341 |
20 |
0 |
| VCDI |
0 |
0 |
0 |
22 |
155 |
3022 |
3077 |
296 |
|
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