Validation of sea ice concentration - Asian sector
Bulletin date: 2025-11-27
Data source: OSI SAF N.H. AMSR sea ice concentration
Model vs. observations, sea ice class contingency tables
Date: 2025-11-21:
| 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 |
718 |
2401 |
24 |
33 |
2 |
0 |
0 |
0 |
| OW |
4 |
862 |
61 |
47 |
11 |
0 |
0 |
0 |
| VODI |
0 |
300 |
121 |
224 |
134 |
12 |
0 |
0 |
| ODI |
0 |
26 |
23 |
111 |
189 |
109 |
3 |
0 |
| CDI |
0 |
8 |
5 |
59 |
206 |
579 |
133 |
0 |
| VCDI |
0 |
20 |
26 |
72 |
115 |
2030 |
10289 |
13125 |
|
...date precedes bulletin
|
Date: 2025-11-23:
| 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 |
594 |
2278 |
34 |
16 |
3 |
0 |
0 |
0 |
| OW |
1 |
365 |
31 |
28 |
6 |
0 |
0 |
0 |
| VODI |
0 |
776 |
122 |
222 |
60 |
0 |
0 |
0 |
| ODI |
0 |
102 |
60 |
167 |
215 |
47 |
0 |
0 |
| CDI |
0 |
7 |
8 |
80 |
238 |
488 |
78 |
1 |
| VCDI |
0 |
28 |
28 |
55 |
117 |
1473 |
9677 |
14677 |
|
...date precedes bulletin
|
Date: 2025-11-25:
| 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 |
202 |
2286 |
50 |
31 |
0 |
0 |
0 |
0 |
| OW |
1 |
497 |
81 |
82 |
10 |
0 |
0 |
0 |
| VODI |
0 |
457 |
204 |
450 |
87 |
0 |
0 |
0 |
| ODI |
0 |
32 |
42 |
184 |
230 |
12 |
0 |
0 |
| CDI |
0 |
3 |
10 |
50 |
231 |
377 |
54 |
20 |
| VCDI |
0 |
2 |
9 |
25 |
46 |
1509 |
11439 |
13369 |
|
...date precedes bulletin
|
Date: 2025-11-27:
| 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 |
70 |
1975 |
31 |
17 |
0 |
0 |
0 |
0 |
| OW |
0 |
683 |
78 |
81 |
1 |
0 |
0 |
0 |
| VODI |
0 |
504 |
152 |
310 |
133 |
7 |
0 |
0 |
| ODI |
0 |
73 |
65 |
234 |
289 |
54 |
0 |
0 |
| CDI |
0 |
3 |
12 |
67 |
208 |
297 |
65 |
0 |
| VCDI |
0 |
0 |
2 |
23 |
143 |
1357 |
10889 |
14259 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
70 |
2022 |
32 |
24 |
1 |
0 |
0 |
0 |
| OW |
0 |
653 |
86 |
63 |
2 |
0 |
0 |
0 |
| VODI |
0 |
500 |
149 |
354 |
140 |
5 |
0 |
0 |
| ODI |
0 |
62 |
59 |
204 |
293 |
53 |
0 |
0 |
| CDI |
0 |
0 |
9 |
68 |
209 |
315 |
68 |
0 |
| VCDI |
0 |
1 |
5 |
19 |
129 |
1342 |
10886 |
14259 |
|
Date: 2025-11-29:
| 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 |
267 |
2277 |
5 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
744 |
30 |
18 |
0 |
0 |
0 |
0 |
| VODI |
0 |
656 |
84 |
101 |
28 |
6 |
0 |
0 |
| ODI |
0 |
204 |
59 |
134 |
66 |
16 |
0 |
0 |
| CDI |
0 |
58 |
24 |
127 |
144 |
87 |
10 |
0 |
| VCDI |
0 |
42 |
57 |
210 |
334 |
2532 |
8723 |
15039 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
267 |
2429 |
11 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
637 |
22 |
21 |
0 |
0 |
0 |
0 |
| VODI |
0 |
606 |
88 |
107 |
33 |
2 |
0 |
0 |
| ODI |
0 |
218 |
55 |
124 |
68 |
21 |
0 |
0 |
| CDI |
0 |
51 |
28 |
134 |
138 |
80 |
11 |
0 |
| VCDI |
0 |
40 |
55 |
204 |
333 |
2538 |
8722 |
15039 |
|
Date: 2025-12-01:
| 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 |
504 |
2403 |
9 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
870 |
80 |
34 |
0 |
0 |
0 |
0 |
| VODI |
0 |
281 |
110 |
192 |
21 |
0 |
0 |
0 |
| ODI |
0 |
34 |
16 |
138 |
117 |
6 |
0 |
0 |
| CDI |
0 |
32 |
16 |
53 |
263 |
215 |
8 |
0 |
| VCDI |
0 |
142 |
57 |
123 |
159 |
2992 |
10797 |
12410 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
502 |
2277 |
16 |
9 |
0 |
0 |
0 |
0 |
| OW |
2 |
512 |
62 |
67 |
8 |
0 |
0 |
0 |
| VODI |
0 |
397 |
58 |
120 |
76 |
1 |
0 |
0 |
| ODI |
0 |
241 |
51 |
100 |
82 |
11 |
1 |
0 |
| CDI |
0 |
123 |
17 |
88 |
120 |
69 |
12 |
0 |
| VCDI |
0 |
212 |
84 |
156 |
274 |
3132 |
10792 |
12410 |
|
Date: 2025-12-03:
| 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 |
77 |
2390 |
31 |
19 |
0 |
0 |
0 |
0 |
| OW |
0 |
427 |
69 |
74 |
12 |
0 |
0 |
0 |
| VODI |
0 |
154 |
97 |
272 |
150 |
18 |
0 |
0 |
| ODI |
0 |
45 |
16 |
132 |
257 |
75 |
1 |
0 |
| CDI |
0 |
32 |
24 |
51 |
223 |
297 |
46 |
0 |
| VCDI |
0 |
6 |
2 |
134 |
317 |
2103 |
10289 |
14242 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
77 |
2299 |
27 |
18 |
0 |
0 |
0 |
0 |
| OW |
0 |
285 |
50 |
80 |
12 |
0 |
0 |
0 |
| VODI |
0 |
192 |
61 |
163 |
110 |
12 |
0 |
0 |
| ODI |
0 |
104 |
45 |
111 |
189 |
51 |
9 |
0 |
| CDI |
0 |
134 |
46 |
157 |
290 |
224 |
62 |
0 |
| VCDI |
0 |
40 |
10 |
153 |
358 |
2206 |
10265 |
14242 |
|
Date: 2025-12-05:
| 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 |
14 |
1797 |
42 |
28 |
0 |
0 |
0 |
0 |
| OW |
0 |
414 |
62 |
92 |
7 |
0 |
0 |
0 |
| VODI |
0 |
108 |
67 |
220 |
117 |
1 |
0 |
0 |
| ODI |
0 |
25 |
30 |
190 |
277 |
37 |
3 |
0 |
| CDI |
0 |
6 |
9 |
97 |
504 |
271 |
43 |
0 |
| VCDI |
0 |
0 |
0 |
24 |
594 |
2048 |
13085 |
11870 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
14 |
1591 |
41 |
59 |
2 |
0 |
0 |
0 |
| OW |
0 |
533 |
54 |
109 |
50 |
0 |
0 |
0 |
| VODI |
0 |
187 |
58 |
136 |
158 |
3 |
0 |
0 |
| ODI |
0 |
30 |
41 |
122 |
228 |
58 |
0 |
0 |
| CDI |
0 |
9 |
15 |
138 |
317 |
197 |
17 |
0 |
| VCDI |
0 |
0 |
1 |
87 |
744 |
2099 |
13114 |
11870 |
|
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