Validation of sea ice concentration - Asian sector
Bulletin date: 2025-10-02
Data source: OSI SAF N.H. AMSR sea ice concentration
Model vs. observations, sea ice class contingency tables
Date: 2025-09-26:
| 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 |
11295 |
5186 |
82 |
25 |
0 |
0 |
0 |
0 |
| OW |
1 |
333 |
180 |
397 |
155 |
31 |
0 |
0 |
| VODI |
0 |
21 |
36 |
178 |
442 |
249 |
3 |
0 |
| ODI |
0 |
0 |
0 |
36 |
291 |
465 |
36 |
0 |
| CDI |
0 |
0 |
0 |
7 |
195 |
846 |
541 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
12 |
715 |
7672 |
2652 |
|
...date precedes bulletin
|
Date: 2025-09-28:
| 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 |
11245 |
4919 |
29 |
14 |
0 |
0 |
0 |
0 |
| OW |
1 |
670 |
158 |
209 |
64 |
0 |
0 |
0 |
| VODI |
0 |
102 |
87 |
293 |
414 |
181 |
28 |
0 |
| ODI |
0 |
17 |
14 |
76 |
275 |
290 |
127 |
0 |
| CDI |
0 |
0 |
3 |
28 |
272 |
708 |
417 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
6 |
1164 |
8665 |
1606 |
|
...date precedes bulletin
|
Date: 2025-09-30:
| 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 |
11157 |
5609 |
41 |
8 |
0 |
0 |
0 |
0 |
| OW |
1 |
559 |
235 |
188 |
7 |
0 |
0 |
0 |
| VODI |
0 |
24 |
85 |
374 |
213 |
6 |
0 |
0 |
| ODI |
0 |
0 |
2 |
94 |
360 |
107 |
0 |
0 |
| CDI |
0 |
0 |
0 |
8 |
303 |
978 |
118 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
56 |
2339 |
8778 |
432 |
|
...date precedes bulletin
|
Date: 2025-10-02:
| 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 |
9779 |
6945 |
91 |
52 |
1 |
0 |
0 |
0 |
| OW |
1 |
404 |
208 |
285 |
57 |
0 |
0 |
0 |
| VODI |
0 |
25 |
65 |
317 |
285 |
51 |
0 |
0 |
| ODI |
0 |
0 |
3 |
72 |
250 |
226 |
14 |
0 |
| CDI |
0 |
0 |
0 |
8 |
189 |
922 |
177 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
14 |
1650 |
7197 |
2794 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
9779 |
6948 |
129 |
74 |
9 |
0 |
0 |
0 |
| OW |
1 |
374 |
182 |
300 |
55 |
0 |
0 |
0 |
| VODI |
0 |
52 |
52 |
279 |
290 |
71 |
0 |
0 |
| ODI |
0 |
0 |
4 |
71 |
231 |
211 |
12 |
0 |
| CDI |
0 |
0 |
0 |
10 |
182 |
835 |
157 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
29 |
1732 |
7219 |
2794 |
|
Date: 2025-10-04:
| 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 |
9491 |
6571 |
80 |
40 |
2 |
0 |
0 |
0 |
| OW |
1 |
750 |
190 |
275 |
50 |
1 |
0 |
0 |
| VODI |
0 |
112 |
101 |
349 |
286 |
64 |
0 |
0 |
| ODI |
0 |
2 |
12 |
129 |
191 |
258 |
19 |
0 |
| CDI |
0 |
0 |
0 |
44 |
224 |
649 |
287 |
0 |
| VCDI |
0 |
0 |
0 |
2 |
37 |
2069 |
9021 |
775 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
9491 |
6693 |
112 |
73 |
11 |
0 |
0 |
0 |
| OW |
1 |
581 |
160 |
274 |
64 |
5 |
0 |
0 |
| VODI |
0 |
158 |
98 |
313 |
282 |
73 |
0 |
0 |
| ODI |
0 |
3 |
13 |
120 |
168 |
218 |
24 |
0 |
| CDI |
0 |
0 |
0 |
52 |
205 |
575 |
213 |
0 |
| VCDI |
0 |
0 |
0 |
7 |
60 |
2170 |
9090 |
775 |
|
Date: 2025-10-06:
| 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 |
9033 |
6312 |
279 |
238 |
10 |
0 |
0 |
0 |
| OW |
1 |
652 |
279 |
284 |
16 |
0 |
0 |
0 |
| VODI |
0 |
4 |
60 |
498 |
215 |
4 |
0 |
0 |
| ODI |
0 |
0 |
0 |
66 |
535 |
68 |
27 |
0 |
| CDI |
0 |
0 |
0 |
2 |
250 |
1199 |
144 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
2 |
2850 |
8908 |
146 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
9027 |
6032 |
302 |
287 |
22 |
0 |
0 |
0 |
| OW |
7 |
685 |
188 |
265 |
88 |
4 |
0 |
0 |
| VODI |
0 |
221 |
94 |
352 |
345 |
65 |
2 |
0 |
| ODI |
0 |
28 |
25 |
138 |
275 |
217 |
20 |
0 |
| CDI |
0 |
2 |
9 |
45 |
239 |
547 |
173 |
0 |
| VCDI |
0 |
0 |
0 |
1 |
59 |
3288 |
8884 |
146 |
|
Date: 2025-10-08:
| 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 |
9658 |
5713 |
81 |
53 |
0 |
0 |
0 |
0 |
| OW |
3 |
806 |
93 |
216 |
55 |
1 |
0 |
0 |
| VODI |
0 |
205 |
144 |
268 |
230 |
26 |
0 |
0 |
| ODI |
0 |
37 |
33 |
162 |
422 |
95 |
6 |
0 |
| CDI |
0 |
13 |
28 |
76 |
503 |
882 |
139 |
0 |
| VCDI |
0 |
0 |
0 |
4 |
72 |
5125 |
6846 |
87 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
9638 |
5177 |
83 |
67 |
5 |
0 |
0 |
0 |
| OW |
23 |
898 |
68 |
185 |
52 |
20 |
0 |
0 |
| VODI |
0 |
506 |
113 |
238 |
292 |
67 |
16 |
0 |
| ODI |
0 |
132 |
64 |
153 |
323 |
106 |
24 |
0 |
| CDI |
0 |
55 |
44 |
119 |
428 |
626 |
133 |
0 |
| VCDI |
0 |
6 |
7 |
17 |
182 |
5310 |
6818 |
87 |
|
Date: 2025-10-10:
| 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 |
10099 |
5102 |
47 |
48 |
4 |
0 |
0 |
0 |
| OW |
35 |
765 |
123 |
248 |
62 |
0 |
0 |
0 |
| VODI |
2 |
259 |
100 |
300 |
305 |
15 |
0 |
0 |
| ODI |
0 |
110 |
19 |
90 |
341 |
181 |
24 |
0 |
| CDI |
0 |
145 |
48 |
115 |
370 |
961 |
489 |
0 |
| VCDI |
0 |
1 |
7 |
31 |
68 |
4617 |
6537 |
414 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
10082 |
4416 |
28 |
24 |
5 |
0 |
0 |
0 |
| OW |
49 |
836 |
86 |
167 |
58 |
5 |
0 |
0 |
| VODI |
5 |
687 |
90 |
273 |
276 |
30 |
29 |
0 |
| ODI |
0 |
245 |
65 |
148 |
209 |
134 |
36 |
0 |
| CDI |
0 |
125 |
58 |
158 |
382 |
560 |
347 |
0 |
| VCDI |
0 |
73 |
17 |
62 |
220 |
5045 |
6638 |
414 |
|
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