Validation of sea ice concentration - Asian sector
Bulletin date: 2025-10-23
Data source: OSI SAF N.H. AMSR sea ice concentration
Model vs. observations, sea ice class contingency tables
Date: 2025-10-17:
| 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 |
7800 |
6151 |
128 |
100 |
79 |
13 |
0 |
0 |
| OW |
10 |
1106 |
219 |
417 |
160 |
16 |
0 |
0 |
| VODI |
0 |
186 |
119 |
379 |
591 |
144 |
0 |
0 |
| ODI |
0 |
67 |
25 |
75 |
288 |
332 |
60 |
0 |
| CDI |
0 |
42 |
39 |
196 |
314 |
1095 |
732 |
0 |
| VCDI |
0 |
0 |
0 |
1 |
89 |
4857 |
6012 |
240 |
|
...date precedes bulletin
|
Date: 2025-10-19:
| 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 |
8183 |
4912 |
213 |
251 |
97 |
16 |
0 |
0 |
| OW |
30 |
1194 |
194 |
419 |
211 |
89 |
0 |
0 |
| VODI |
4 |
310 |
136 |
370 |
402 |
384 |
24 |
0 |
| ODI |
0 |
59 |
29 |
116 |
200 |
452 |
112 |
0 |
| CDI |
0 |
31 |
43 |
228 |
195 |
828 |
595 |
0 |
| VCDI |
0 |
0 |
0 |
5 |
115 |
4412 |
6311 |
912 |
|
...date precedes bulletin
|
Date: 2025-10-21:
| 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 |
7536 |
4611 |
251 |
325 |
217 |
22 |
0 |
0 |
| OW |
9 |
524 |
294 |
621 |
316 |
52 |
0 |
0 |
| VODI |
0 |
32 |
49 |
749 |
490 |
212 |
0 |
0 |
| ODI |
0 |
1 |
0 |
228 |
318 |
328 |
37 |
0 |
| CDI |
0 |
0 |
0 |
63 |
362 |
1308 |
481 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
3913 |
7271 |
1462 |
|
...date precedes bulletin
|
Date: 2025-10-23:
| 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 |
7200 |
3211 |
351 |
522 |
154 |
38 |
0 |
0 |
| OW |
12 |
261 |
226 |
740 |
513 |
233 |
0 |
0 |
| VODI |
0 |
51 |
46 |
689 |
669 |
405 |
8 |
0 |
| ODI |
0 |
7 |
18 |
174 |
603 |
520 |
66 |
0 |
| CDI |
0 |
0 |
0 |
4 |
424 |
861 |
375 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
49 |
4361 |
6481 |
2810 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
7212 |
3277 |
409 |
655 |
316 |
90 |
0 |
0 |
| OW |
0 |
172 |
164 |
663 |
358 |
226 |
0 |
0 |
| VODI |
0 |
75 |
50 |
672 |
693 |
411 |
11 |
0 |
| ODI |
0 |
6 |
18 |
134 |
544 |
466 |
83 |
0 |
| CDI |
0 |
0 |
0 |
5 |
446 |
812 |
376 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
55 |
4413 |
6460 |
2810 |
|
Date: 2025-10-25:
| 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 |
7000 |
2653 |
271 |
425 |
76 |
0 |
0 |
0 |
| OW |
11 |
171 |
174 |
641 |
407 |
68 |
0 |
0 |
| VODI |
0 |
30 |
31 |
440 |
874 |
570 |
15 |
0 |
| ODI |
0 |
6 |
4 |
59 |
965 |
582 |
109 |
0 |
| CDI |
0 |
1 |
2 |
18 |
463 |
894 |
377 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
79 |
4225 |
8187 |
2254 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
7011 |
2673 |
285 |
416 |
121 |
13 |
0 |
0 |
| OW |
0 |
155 |
159 |
673 |
383 |
128 |
0 |
0 |
| VODI |
0 |
13 |
31 |
422 |
926 |
577 |
28 |
0 |
| ODI |
0 |
19 |
5 |
55 |
902 |
526 |
121 |
0 |
| CDI |
0 |
1 |
2 |
17 |
411 |
883 |
367 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
121 |
4212 |
8172 |
2254 |
|
Date: 2025-10-27:
| 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 |
6806 |
2279 |
144 |
173 |
11 |
0 |
0 |
0 |
| OW |
12 |
151 |
235 |
567 |
130 |
0 |
0 |
0 |
| VODI |
0 |
8 |
29 |
665 |
902 |
20 |
0 |
0 |
| ODI |
0 |
0 |
2 |
42 |
1074 |
971 |
114 |
0 |
| CDI |
0 |
0 |
0 |
0 |
438 |
1757 |
454 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
18 |
3894 |
8560 |
2626 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
6816 |
2313 |
229 |
330 |
114 |
0 |
0 |
0 |
| OW |
2 |
77 |
143 |
634 |
409 |
33 |
0 |
0 |
| VODI |
0 |
36 |
21 |
353 |
942 |
256 |
0 |
0 |
| ODI |
0 |
12 |
15 |
118 |
715 |
637 |
9 |
0 |
| CDI |
0 |
0 |
2 |
9 |
333 |
1345 |
236 |
0 |
| VCDI |
0 |
0 |
0 |
3 |
60 |
4371 |
8883 |
2626 |
|
Date: 2025-10-29:
| 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 |
6650 |
1627 |
55 |
30 |
13 |
0 |
0 |
0 |
| OW |
48 |
103 |
50 |
135 |
103 |
38 |
1 |
0 |
| VODI |
0 |
96 |
64 |
365 |
646 |
463 |
3 |
0 |
| ODI |
0 |
0 |
2 |
35 |
783 |
827 |
116 |
0 |
| CDI |
0 |
0 |
0 |
0 |
171 |
1139 |
492 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
8 |
3789 |
11152 |
3078 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
6688 |
1791 |
123 |
183 |
161 |
59 |
0 |
0 |
| OW |
10 |
35 |
46 |
276 |
372 |
191 |
1 |
0 |
| VODI |
0 |
0 |
2 |
92 |
786 |
710 |
55 |
0 |
| ODI |
0 |
0 |
0 |
13 |
250 |
814 |
234 |
0 |
| CDI |
0 |
0 |
0 |
1 |
133 |
1149 |
897 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
22 |
3333 |
10577 |
3078 |
|
Date: 2025-10-31:
| 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 |
4842 |
2526 |
113 |
158 |
31 |
3 |
0 |
0 |
| OW |
47 |
235 |
44 |
146 |
46 |
28 |
1 |
0 |
| VODI |
0 |
55 |
76 |
214 |
244 |
274 |
109 |
0 |
| ODI |
0 |
10 |
7 |
22 |
154 |
1066 |
378 |
0 |
| CDI |
0 |
0 |
0 |
2 |
64 |
859 |
734 |
11 |
| VCDI |
0 |
0 |
0 |
0 |
4 |
3009 |
11634 |
4936 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
4889 |
2790 |
195 |
291 |
48 |
10 |
30 |
0 |
| OW |
0 |
34 |
35 |
184 |
179 |
241 |
87 |
0 |
| VODI |
0 |
2 |
10 |
63 |
235 |
772 |
256 |
0 |
| ODI |
0 |
0 |
0 |
4 |
56 |
836 |
371 |
9 |
| CDI |
0 |
0 |
0 |
0 |
24 |
881 |
1055 |
12 |
| VCDI |
0 |
0 |
0 |
0 |
1 |
2499 |
11057 |
4926 |
|
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