Validation of sea ice concentration - Asian sector
Bulletin date: 2025-08-21
Data source: OSI SAF N.H. AMSR sea ice concentration
Model vs. observations, sea ice class contingency tables
Date: 2025-08-15:
| 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 |
8551 |
5280 |
6 |
3 |
0 |
0 |
0 |
0 |
| OW |
382 |
1866 |
248 |
107 |
0 |
0 |
0 |
0 |
| VODI |
7 |
268 |
338 |
1440 |
351 |
3 |
0 |
0 |
| ODI |
0 |
0 |
3 |
440 |
3836 |
831 |
0 |
0 |
| CDI |
0 |
0 |
0 |
6 |
1840 |
6192 |
84 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
...date precedes bulletin
|
Date: 2025-08-17:
| 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 |
9028 |
4910 |
9 |
1 |
0 |
0 |
0 |
0 |
| OW |
311 |
1920 |
181 |
99 |
1 |
0 |
0 |
0 |
| VODI |
0 |
388 |
416 |
1234 |
542 |
17 |
0 |
0 |
| ODI |
0 |
3 |
11 |
525 |
4522 |
456 |
2 |
0 |
| CDI |
0 |
0 |
0 |
10 |
2790 |
4624 |
82 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
...date precedes bulletin
|
Date: 2025-08-19:
| 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 |
9987 |
4982 |
24 |
2 |
0 |
0 |
0 |
0 |
| OW |
198 |
1618 |
410 |
233 |
4 |
0 |
0 |
0 |
| VODI |
0 |
29 |
148 |
1400 |
530 |
6 |
0 |
0 |
| ODI |
0 |
0 |
0 |
190 |
6006 |
1690 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
955 |
3651 |
19 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
...date precedes bulletin
|
Date: 2025-08-21:
| 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 |
10749 |
4386 |
10 |
6 |
0 |
0 |
0 |
0 |
| OW |
174 |
1571 |
317 |
243 |
1 |
0 |
0 |
0 |
| VODI |
0 |
109 |
224 |
1376 |
636 |
8 |
0 |
0 |
| ODI |
0 |
3 |
4 |
247 |
4969 |
1981 |
5 |
0 |
| CDI |
0 |
0 |
0 |
0 |
1670 |
3303 |
90 |
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 |
10720 |
4685 |
40 |
11 |
0 |
0 |
0 |
0 |
| OW |
203 |
1277 |
323 |
318 |
8 |
0 |
0 |
0 |
| VODI |
0 |
106 |
189 |
1262 |
674 |
18 |
0 |
0 |
| ODI |
0 |
1 |
3 |
281 |
4804 |
1699 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
1790 |
3575 |
95 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
Date: 2025-08-23:
| 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 |
10953 |
4263 |
24 |
12 |
1 |
0 |
0 |
0 |
| OW |
144 |
1607 |
241 |
224 |
9 |
0 |
0 |
0 |
| VODI |
0 |
269 |
281 |
1310 |
654 |
22 |
0 |
0 |
| ODI |
0 |
3 |
3 |
370 |
4712 |
1652 |
2 |
0 |
| CDI |
0 |
0 |
0 |
9 |
1809 |
3477 |
31 |
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 |
10930 |
4438 |
28 |
18 |
2 |
0 |
0 |
0 |
| OW |
167 |
1456 |
274 |
294 |
25 |
0 |
0 |
0 |
| VODI |
0 |
246 |
245 |
1209 |
702 |
27 |
0 |
0 |
| ODI |
0 |
2 |
2 |
385 |
4493 |
1318 |
0 |
0 |
| CDI |
0 |
0 |
0 |
19 |
1963 |
3806 |
33 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
Date: 2025-08-25:
| 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 |
10284 |
5639 |
29 |
19 |
0 |
0 |
0 |
0 |
| OW |
63 |
1277 |
491 |
270 |
2 |
0 |
0 |
0 |
| VODI |
0 |
2 |
81 |
1652 |
461 |
0 |
0 |
0 |
| ODI |
0 |
0 |
0 |
304 |
5124 |
412 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
1308 |
4633 |
0 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
31 |
0 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
10194 |
5009 |
28 |
28 |
0 |
0 |
0 |
0 |
| OW |
153 |
1593 |
279 |
285 |
28 |
0 |
0 |
0 |
| VODI |
0 |
314 |
283 |
1315 |
691 |
33 |
0 |
0 |
| ODI |
0 |
2 |
11 |
598 |
4008 |
1450 |
0 |
0 |
| CDI |
0 |
0 |
0 |
19 |
2168 |
3593 |
0 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
Date: 2025-08-27:
| 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 |
11396 |
4606 |
23 |
16 |
0 |
0 |
0 |
0 |
| OW |
48 |
1441 |
331 |
200 |
0 |
0 |
0 |
0 |
| VODI |
0 |
70 |
195 |
1421 |
657 |
20 |
0 |
0 |
| ODI |
0 |
0 |
3 |
267 |
4044 |
792 |
0 |
0 |
| CDI |
0 |
0 |
0 |
4 |
1741 |
4735 |
72 |
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 |
11339 |
3625 |
29 |
22 |
0 |
0 |
0 |
0 |
| OW |
105 |
1914 |
181 |
211 |
23 |
1 |
0 |
0 |
| VODI |
0 |
574 |
320 |
1066 |
702 |
106 |
0 |
0 |
| ODI |
0 |
4 |
22 |
574 |
3561 |
2088 |
51 |
0 |
| CDI |
0 |
0 |
0 |
35 |
2156 |
3352 |
21 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
Date: 2025-08-29:
| 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 |
11615 |
4450 |
15 |
4 |
0 |
0 |
0 |
0 |
| OW |
22 |
1579 |
266 |
137 |
2 |
0 |
0 |
0 |
| VODI |
0 |
159 |
319 |
1456 |
565 |
11 |
0 |
0 |
| ODI |
0 |
1 |
5 |
468 |
4055 |
873 |
0 |
0 |
| CDI |
0 |
0 |
0 |
10 |
1675 |
4361 |
34 |
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 |
11571 |
3389 |
27 |
6 |
0 |
0 |
0 |
0 |
| OW |
66 |
1972 |
178 |
206 |
25 |
0 |
0 |
0 |
| VODI |
0 |
820 |
357 |
1067 |
643 |
65 |
0 |
0 |
| ODI |
0 |
8 |
43 |
745 |
3687 |
1324 |
0 |
0 |
| CDI |
0 |
0 |
0 |
51 |
1942 |
3856 |
34 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
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