Validation of sea ice concentration - Asian sector
Bulletin date: 2025-08-14
Data source: OSI SAF N.H. AMSR sea ice concentration
Model vs. observations, sea ice class contingency tables
Date: 2025-08-08:
| 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 |
6939 |
6521 |
28 |
8 |
3 |
0 |
0 |
0 |
| OW |
2 |
1896 |
327 |
305 |
26 |
0 |
0 |
0 |
| VODI |
0 |
270 |
273 |
1076 |
448 |
7 |
0 |
0 |
| ODI |
0 |
9 |
16 |
364 |
2514 |
1248 |
2 |
0 |
| CDI |
0 |
0 |
6 |
100 |
2128 |
6970 |
569 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
1 |
26 |
0 |
|
...date precedes bulletin
|
Date: 2025-08-10:
| 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 |
7240 |
6048 |
7 |
3 |
2 |
0 |
0 |
0 |
| OW |
48 |
2147 |
271 |
205 |
7 |
0 |
0 |
0 |
| VODI |
0 |
444 |
347 |
1080 |
340 |
18 |
0 |
0 |
| ODI |
0 |
24 |
34 |
563 |
2358 |
1392 |
170 |
0 |
| CDI |
0 |
1 |
22 |
155 |
3283 |
5129 |
701 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
3 |
40 |
0 |
|
...date precedes bulletin
|
Date: 2025-08-12:
| 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 |
8093 |
5879 |
6 |
4 |
0 |
0 |
0 |
0 |
| OW |
224 |
1848 |
439 |
172 |
1 |
0 |
0 |
0 |
| VODI |
0 |
40 |
219 |
1385 |
390 |
0 |
0 |
0 |
| ODI |
0 |
0 |
0 |
308 |
4035 |
811 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
1824 |
6076 |
203 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
20 |
105 |
0 |
|
...date precedes bulletin
|
Date: 2025-08-14:
| 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 |
8422 |
5414 |
7 |
4 |
0 |
0 |
0 |
0 |
| OW |
394 |
1783 |
294 |
144 |
0 |
0 |
0 |
0 |
| VODI |
9 |
190 |
292 |
1398 |
347 |
1 |
0 |
0 |
| ODI |
0 |
0 |
1 |
396 |
3834 |
932 |
1 |
0 |
| CDI |
0 |
0 |
0 |
0 |
1506 |
6582 |
131 |
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 |
8510 |
5554 |
10 |
5 |
0 |
0 |
0 |
0 |
| OW |
306 |
1648 |
317 |
180 |
1 |
0 |
0 |
0 |
| VODI |
9 |
185 |
266 |
1319 |
357 |
1 |
0 |
0 |
| ODI |
0 |
0 |
1 |
433 |
3787 |
1282 |
1 |
0 |
| CDI |
0 |
0 |
0 |
5 |
1542 |
6224 |
131 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
8 |
0 |
0 |
|
Date: 2025-08-16:
| 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 |
8635 |
5284 |
4 |
3 |
0 |
0 |
0 |
0 |
| OW |
349 |
1870 |
201 |
106 |
0 |
0 |
0 |
0 |
| VODI |
0 |
301 |
379 |
1381 |
459 |
6 |
0 |
0 |
| ODI |
0 |
0 |
7 |
463 |
4059 |
722 |
1 |
0 |
| CDI |
0 |
0 |
0 |
5 |
2157 |
5550 |
140 |
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 |
8720 |
5372 |
13 |
7 |
0 |
0 |
0 |
0 |
| OW |
256 |
1822 |
237 |
141 |
0 |
0 |
0 |
0 |
| VODI |
8 |
259 |
329 |
1283 |
457 |
10 |
0 |
0 |
| ODI |
0 |
2 |
12 |
523 |
4272 |
1302 |
23 |
0 |
| CDI |
0 |
0 |
0 |
4 |
1946 |
4966 |
118 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
Date: 2025-08-18:
| 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 |
7818 |
7013 |
38 |
36 |
3 |
0 |
0 |
0 |
| OW |
113 |
1724 |
465 |
226 |
2 |
0 |
0 |
0 |
| VODI |
0 |
8 |
104 |
1432 |
467 |
0 |
0 |
0 |
| ODI |
0 |
0 |
0 |
188 |
6844 |
634 |
0 |
0 |
| CDI |
0 |
0 |
0 |
2 |
922 |
4010 |
29 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
2 |
2 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
7689 |
6370 |
39 |
39 |
3 |
0 |
0 |
0 |
| OW |
242 |
1944 |
186 |
140 |
9 |
0 |
0 |
0 |
| VODI |
0 |
418 |
345 |
1071 |
711 |
17 |
0 |
0 |
| ODI |
0 |
13 |
37 |
622 |
5157 |
690 |
0 |
0 |
| CDI |
0 |
0 |
0 |
12 |
2358 |
3939 |
31 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
Date: 2025-08-20:
| 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 |
10247 |
4841 |
16 |
8 |
0 |
0 |
0 |
0 |
| OW |
181 |
1604 |
347 |
247 |
0 |
0 |
0 |
0 |
| VODI |
0 |
92 |
166 |
1412 |
518 |
9 |
0 |
0 |
| ODI |
0 |
1 |
3 |
210 |
5546 |
1758 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
1418 |
3456 |
2 |
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 |
10078 |
4198 |
31 |
12 |
0 |
0 |
0 |
0 |
| OW |
350 |
1823 |
187 |
231 |
12 |
0 |
0 |
0 |
| VODI |
0 |
509 |
289 |
1099 |
774 |
30 |
0 |
0 |
| ODI |
0 |
8 |
25 |
532 |
4389 |
1118 |
1 |
0 |
| CDI |
0 |
0 |
0 |
3 |
2307 |
4075 |
1 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
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 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
10540 |
3940 |
42 |
10 |
0 |
0 |
0 |
0 |
| OW |
310 |
1793 |
233 |
380 |
60 |
2 |
0 |
0 |
| VODI |
0 |
486 |
261 |
987 |
916 |
124 |
0 |
0 |
| ODI |
0 |
11 |
27 |
476 |
3364 |
1418 |
73 |
0 |
| CDI |
0 |
0 |
0 |
29 |
2664 |
3936 |
0 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
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