Validation of sea ice concentration - Asian sector
Bulletin date: 2025-10-16
Data source: OSI SAF N.H. AMSR sea ice concentration
Model vs. observations, sea ice class contingency tables
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 |
|
...date precedes bulletin
|
Date: 2025-10-12:
| 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 |
9400 |
5604 |
79 |
113 |
2 |
0 |
0 |
0 |
| OW |
38 |
1062 |
80 |
210 |
27 |
0 |
0 |
0 |
| VODI |
0 |
381 |
151 |
277 |
198 |
9 |
0 |
0 |
| ODI |
0 |
158 |
39 |
150 |
326 |
80 |
31 |
0 |
| CDI |
0 |
204 |
46 |
165 |
584 |
1042 |
384 |
0 |
| VCDI |
0 |
6 |
4 |
16 |
81 |
3675 |
7353 |
107 |
|
...date precedes bulletin
|
Date: 2025-10-14:
| 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 |
8578 |
6367 |
109 |
123 |
2 |
0 |
0 |
0 |
| OW |
11 |
1063 |
274 |
406 |
59 |
0 |
0 |
0 |
| VODI |
0 |
36 |
109 |
330 |
423 |
8 |
0 |
0 |
| ODI |
0 |
0 |
11 |
163 |
432 |
236 |
2 |
0 |
| CDI |
0 |
0 |
0 |
111 |
260 |
1884 |
566 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
58 |
3332 |
7061 |
68 |
|
...date precedes bulletin
|
Date: 2025-10-16:
| 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 |
8650 |
5661 |
152 |
127 |
65 |
1 |
0 |
0 |
| OW |
1 |
1037 |
190 |
436 |
109 |
0 |
0 |
0 |
| VODI |
0 |
216 |
72 |
334 |
587 |
47 |
0 |
0 |
| ODI |
0 |
94 |
21 |
57 |
372 |
278 |
4 |
0 |
| CDI |
0 |
27 |
71 |
195 |
283 |
1269 |
454 |
0 |
| VCDI |
0 |
0 |
0 |
12 |
109 |
5526 |
5593 |
32 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
8646 |
5891 |
179 |
195 |
80 |
1 |
0 |
0 |
| OW |
5 |
810 |
162 |
413 |
129 |
2 |
0 |
0 |
| VODI |
0 |
209 |
78 |
309 |
575 |
59 |
0 |
0 |
| ODI |
0 |
91 |
15 |
47 |
378 |
305 |
7 |
0 |
| CDI |
0 |
34 |
72 |
192 |
259 |
1321 |
438 |
0 |
| VCDI |
0 |
0 |
0 |
5 |
104 |
5433 |
5606 |
32 |
|
Date: 2025-10-18:
| 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 |
7812 |
5864 |
136 |
136 |
67 |
12 |
0 |
0 |
| OW |
27 |
1155 |
183 |
414 |
184 |
54 |
0 |
0 |
| VODI |
0 |
289 |
89 |
340 |
444 |
298 |
2 |
0 |
| ODI |
0 |
72 |
37 |
80 |
259 |
394 |
97 |
0 |
| CDI |
0 |
52 |
44 |
217 |
223 |
967 |
616 |
0 |
| VCDI |
0 |
0 |
0 |
1 |
114 |
4832 |
6030 |
541 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
7812 |
6157 |
173 |
219 |
80 |
28 |
0 |
0 |
| OW |
26 |
834 |
151 |
356 |
221 |
71 |
0 |
0 |
| VODI |
1 |
329 |
84 |
315 |
410 |
284 |
14 |
0 |
| ODI |
0 |
67 |
35 |
77 |
269 |
374 |
122 |
0 |
| CDI |
0 |
45 |
46 |
216 |
201 |
1029 |
679 |
0 |
| VCDI |
0 |
0 |
0 |
5 |
110 |
4771 |
5930 |
541 |
|
Date: 2025-10-20:
| 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 |
7567 |
5198 |
206 |
276 |
46 |
0 |
0 |
0 |
| OW |
20 |
795 |
384 |
507 |
158 |
8 |
0 |
0 |
| VODI |
8 |
14 |
53 |
885 |
337 |
93 |
0 |
0 |
| ODI |
0 |
0 |
2 |
170 |
486 |
197 |
6 |
0 |
| CDI |
0 |
0 |
0 |
52 |
353 |
1813 |
219 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
4167 |
6679 |
1383 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
7570 |
4927 |
271 |
489 |
214 |
34 |
0 |
0 |
| OW |
12 |
776 |
194 |
473 |
314 |
154 |
11 |
0 |
| VODI |
13 |
272 |
136 |
490 |
363 |
541 |
72 |
0 |
| ODI |
0 |
30 |
28 |
167 |
223 |
425 |
181 |
0 |
| CDI |
0 |
2 |
16 |
192 |
97 |
836 |
826 |
0 |
| VCDI |
0 |
0 |
0 |
79 |
169 |
4288 |
5814 |
1383 |
|
Date: 2025-10-22:
| 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 |
7412 |
4004 |
414 |
414 |
149 |
20 |
0 |
0 |
| OW |
9 |
353 |
222 |
640 |
471 |
93 |
0 |
0 |
| VODI |
0 |
94 |
50 |
787 |
571 |
269 |
0 |
0 |
| ODI |
0 |
0 |
4 |
205 |
386 |
418 |
73 |
0 |
| CDI |
0 |
0 |
0 |
88 |
322 |
1058 |
368 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
18 |
4200 |
7593 |
1377 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
7421 |
3553 |
328 |
434 |
400 |
114 |
0 |
0 |
| OW |
0 |
578 |
200 |
389 |
456 |
410 |
18 |
0 |
| VODI |
0 |
320 |
152 |
647 |
437 |
508 |
222 |
0 |
| ODI |
0 |
0 |
10 |
391 |
316 |
377 |
362 |
0 |
| CDI |
0 |
0 |
0 |
150 |
123 |
534 |
665 |
0 |
| VCDI |
0 |
0 |
0 |
123 |
185 |
4115 |
6767 |
1377 |
|
Date: 2025-10-24:
| 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 |
7049 |
2709 |
344 |
551 |
191 |
20 |
0 |
0 |
| OW |
15 |
129 |
167 |
673 |
496 |
260 |
1 |
0 |
| VODI |
0 |
25 |
18 |
565 |
767 |
655 |
32 |
0 |
| ODI |
0 |
0 |
4 |
62 |
725 |
513 |
115 |
0 |
| CDI |
0 |
0 |
0 |
9 |
505 |
846 |
489 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
53 |
4114 |
7676 |
2304 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
7064 |
2518 |
249 |
342 |
271 |
146 |
1 |
0 |
| OW |
0 |
294 |
216 |
483 |
419 |
516 |
47 |
0 |
| VODI |
0 |
50 |
66 |
669 |
601 |
745 |
320 |
0 |
| ODI |
0 |
1 |
2 |
329 |
698 |
522 |
441 |
0 |
| CDI |
0 |
0 |
0 |
35 |
407 |
504 |
598 |
0 |
| VCDI |
0 |
0 |
0 |
2 |
341 |
3975 |
6906 |
2304 |
|
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