Validation of sea ice concentration - Asian sector
Bulletin date: 2025-08-28
Data source: OSI SAF N.H. AMSR sea ice concentration
Model vs. observations, sea ice class contingency tables
Date: 2025-08-22:
| 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 |
10696 |
4479 |
32 |
14 |
1 |
0 |
0 |
0 |
| OW |
154 |
1573 |
272 |
254 |
7 |
0 |
0 |
0 |
| VODI |
0 |
175 |
255 |
1361 |
636 |
21 |
0 |
0 |
| ODI |
0 |
3 |
4 |
250 |
4748 |
1800 |
2 |
0 |
| CDI |
0 |
0 |
0 |
3 |
1612 |
3659 |
71 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
...date precedes bulletin
|
Date: 2025-08-24:
| 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 |
9666 |
5530 |
31 |
14 |
0 |
0 |
0 |
0 |
| OW |
132 |
1646 |
236 |
214 |
5 |
0 |
0 |
0 |
| VODI |
0 |
302 |
311 |
1322 |
661 |
11 |
0 |
0 |
| ODI |
0 |
3 |
5 |
451 |
4646 |
1646 |
4 |
0 |
| CDI |
0 |
0 |
0 |
3 |
2088 |
3115 |
40 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
...date precedes bulletin
|
Date: 2025-08-26:
| 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 |
11273 |
4669 |
32 |
18 |
0 |
0 |
0 |
0 |
| OW |
56 |
1336 |
418 |
235 |
1 |
0 |
0 |
0 |
| VODI |
0 |
27 |
140 |
1513 |
627 |
4 |
0 |
0 |
| ODI |
0 |
0 |
0 |
252 |
4312 |
898 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
1344 |
4822 |
86 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
15 |
4 |
0 |
|
...date precedes bulletin
|
Date: 2025-08-28:
| 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 |
11548 |
4512 |
25 |
13 |
0 |
0 |
0 |
0 |
| OW |
34 |
1505 |
290 |
177 |
1 |
0 |
0 |
0 |
| VODI |
0 |
126 |
251 |
1451 |
556 |
8 |
0 |
0 |
| ODI |
0 |
0 |
4 |
445 |
4164 |
500 |
0 |
0 |
| CDI |
0 |
0 |
0 |
7 |
1955 |
4467 |
43 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
11536 |
4831 |
33 |
11 |
0 |
0 |
0 |
0 |
| OW |
46 |
1175 |
290 |
187 |
3 |
0 |
0 |
0 |
| VODI |
0 |
137 |
239 |
1364 |
558 |
5 |
0 |
0 |
| ODI |
0 |
0 |
8 |
502 |
4222 |
728 |
0 |
0 |
| CDI |
0 |
0 |
0 |
29 |
1893 |
4242 |
43 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
Date: 2025-08-30:
| 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 |
11712 |
4299 |
8 |
4 |
0 |
0 |
0 |
0 |
| OW |
15 |
1662 |
214 |
134 |
10 |
0 |
0 |
0 |
| VODI |
0 |
226 |
352 |
1449 |
621 |
0 |
0 |
0 |
| ODI |
0 |
4 |
8 |
538 |
4371 |
988 |
6 |
0 |
| CDI |
0 |
0 |
0 |
4 |
1352 |
4046 |
59 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
11698 |
4587 |
9 |
5 |
0 |
0 |
0 |
0 |
| OW |
29 |
1378 |
226 |
122 |
7 |
0 |
0 |
0 |
| VODI |
0 |
223 |
342 |
1427 |
587 |
3 |
0 |
0 |
| ODI |
0 |
3 |
5 |
555 |
4343 |
1288 |
18 |
0 |
| CDI |
0 |
0 |
0 |
20 |
1417 |
3743 |
47 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
Date: 2025-09-01:
| 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 |
11527 |
4804 |
10 |
2 |
0 |
0 |
0 |
0 |
| OW |
0 |
1443 |
442 |
195 |
3 |
0 |
0 |
0 |
| VODI |
0 |
9 |
137 |
1765 |
491 |
0 |
0 |
0 |
| ODI |
0 |
0 |
0 |
406 |
5805 |
972 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
765 |
3298 |
0 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
8 |
0 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
11515 |
4344 |
13 |
3 |
0 |
0 |
0 |
0 |
| OW |
12 |
1553 |
186 |
150 |
16 |
0 |
0 |
0 |
| VODI |
0 |
348 |
358 |
1422 |
752 |
15 |
0 |
0 |
| ODI |
0 |
11 |
32 |
761 |
4811 |
1857 |
0 |
0 |
| CDI |
0 |
0 |
0 |
32 |
1485 |
2406 |
0 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
Date: 2025-09-03:
| 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 |
11495 |
4661 |
5 |
3 |
0 |
0 |
0 |
0 |
| OW |
0 |
1538 |
331 |
208 |
4 |
0 |
0 |
0 |
| VODI |
0 |
99 |
292 |
1686 |
508 |
5 |
0 |
0 |
| ODI |
0 |
0 |
0 |
525 |
5483 |
1106 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
844 |
3289 |
0 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
11495 |
4223 |
4 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
1630 |
225 |
171 |
10 |
0 |
0 |
0 |
| VODI |
0 |
424 |
347 |
1424 |
846 |
20 |
0 |
0 |
| ODI |
0 |
21 |
52 |
797 |
4685 |
1840 |
0 |
0 |
| CDI |
0 |
0 |
0 |
30 |
1298 |
2540 |
0 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
Date: 2025-09-05:
| 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 |
11536 |
4347 |
19 |
1 |
0 |
0 |
0 |
0 |
| OW |
0 |
1638 |
287 |
157 |
9 |
0 |
0 |
0 |
| VODI |
0 |
198 |
331 |
1742 |
577 |
8 |
0 |
0 |
| ODI |
0 |
0 |
0 |
478 |
4879 |
1634 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
769 |
3472 |
0 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
11536 |
4067 |
44 |
2 |
0 |
0 |
0 |
0 |
| OW |
0 |
1587 |
228 |
273 |
37 |
0 |
0 |
0 |
| VODI |
0 |
502 |
322 |
1377 |
1026 |
101 |
0 |
0 |
| ODI |
0 |
27 |
43 |
699 |
3862 |
2208 |
0 |
0 |
| CDI |
0 |
0 |
0 |
27 |
1309 |
2805 |
0 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
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