Validation of sea ice concentration - Asian sector
Bulletin date: 2025-08-07
Data source: OSI SAF N.H. AMSR sea ice concentration
Model vs. observations, sea ice class contingency tables
Date: 2025-08-01:
| 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 |
5111 |
6979 |
58 |
9 |
2 |
0 |
0 |
0 |
| OW |
0 |
2212 |
418 |
320 |
15 |
0 |
0 |
0 |
| VODI |
0 |
209 |
295 |
1332 |
591 |
12 |
0 |
0 |
| ODI |
0 |
2 |
6 |
285 |
3084 |
4925 |
87 |
0 |
| CDI |
0 |
0 |
0 |
23 |
1032 |
4715 |
360 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
...date precedes bulletin
|
Date: 2025-08-03:
| 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 |
6254 |
5803 |
49 |
10 |
2 |
0 |
0 |
0 |
| OW |
89 |
2274 |
327 |
283 |
19 |
0 |
0 |
0 |
| VODI |
0 |
399 |
317 |
1317 |
694 |
6 |
0 |
0 |
| ODI |
0 |
7 |
15 |
418 |
3410 |
5247 |
66 |
0 |
| CDI |
0 |
0 |
0 |
46 |
706 |
4201 |
123 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
...date precedes bulletin
|
Date: 2025-08-05:
| 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 |
6621 |
6711 |
45 |
10 |
3 |
1 |
0 |
0 |
| OW |
21 |
1784 |
492 |
346 |
16 |
0 |
0 |
0 |
| VODI |
0 |
44 |
165 |
1176 |
505 |
19 |
0 |
0 |
| ODI |
0 |
0 |
0 |
265 |
2775 |
1031 |
8 |
0 |
| CDI |
0 |
0 |
0 |
12 |
1875 |
7424 |
339 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
275 |
119 |
0 |
|
...date precedes bulletin
|
Date: 2025-08-07:
| 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 |
6702 |
6694 |
40 |
14 |
3 |
0 |
0 |
0 |
| OW |
10 |
1782 |
393 |
327 |
33 |
0 |
0 |
0 |
| VODI |
0 |
169 |
239 |
1092 |
493 |
13 |
0 |
0 |
| ODI |
0 |
3 |
9 |
328 |
2259 |
1634 |
3 |
0 |
| CDI |
0 |
0 |
1 |
83 |
2057 |
7376 |
240 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
58 |
27 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
6685 |
6946 |
60 |
24 |
3 |
0 |
0 |
0 |
| OW |
27 |
1525 |
409 |
401 |
39 |
0 |
0 |
0 |
| VODI |
0 |
174 |
201 |
992 |
557 |
31 |
0 |
0 |
| ODI |
0 |
3 |
7 |
332 |
2230 |
1608 |
6 |
0 |
| CDI |
0 |
0 |
5 |
95 |
2016 |
7221 |
215 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
221 |
49 |
0 |
|
Date: 2025-08-09:
| 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 |
7077 |
6356 |
17 |
3 |
2 |
0 |
0 |
0 |
| OW |
10 |
2045 |
303 |
218 |
14 |
0 |
0 |
0 |
| VODI |
0 |
386 |
339 |
1049 |
349 |
7 |
0 |
0 |
| ODI |
0 |
15 |
22 |
501 |
2492 |
1337 |
2 |
0 |
| CDI |
0 |
0 |
17 |
144 |
3386 |
5597 |
361 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
0 |
33 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
7055 |
6631 |
45 |
9 |
2 |
0 |
0 |
0 |
| OW |
32 |
1824 |
327 |
291 |
16 |
0 |
0 |
0 |
| VODI |
0 |
329 |
283 |
983 |
428 |
21 |
0 |
0 |
| ODI |
0 |
18 |
26 |
485 |
2236 |
1359 |
0 |
0 |
| CDI |
0 |
0 |
17 |
147 |
3561 |
5475 |
233 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
86 |
163 |
0 |
|
Date: 2025-08-11:
| 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 |
7805 |
6231 |
17 |
3 |
1 |
0 |
0 |
0 |
| OW |
142 |
1844 |
491 |
218 |
1 |
0 |
0 |
0 |
| VODI |
0 |
9 |
132 |
1423 |
386 |
0 |
0 |
0 |
| ODI |
0 |
0 |
0 |
237 |
4290 |
610 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
1483 |
6518 |
33 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
82 |
126 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
7742 |
5736 |
37 |
6 |
1 |
0 |
0 |
0 |
| OW |
205 |
1901 |
269 |
288 |
13 |
0 |
0 |
0 |
| VODI |
0 |
415 |
285 |
922 |
490 |
28 |
0 |
0 |
| ODI |
0 |
32 |
37 |
505 |
2187 |
1428 |
9 |
0 |
| CDI |
0 |
0 |
12 |
160 |
3470 |
5479 |
144 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
275 |
6 |
0 |
|
Date: 2025-08-13:
| 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 |
8208 |
5693 |
7 |
6 |
0 |
0 |
0 |
0 |
| OW |
228 |
1912 |
345 |
154 |
0 |
0 |
0 |
0 |
| VODI |
0 |
112 |
255 |
1371 |
376 |
8 |
0 |
0 |
| ODI |
0 |
0 |
0 |
341 |
3694 |
1177 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
1704 |
6280 |
139 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
72 |
0 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
8072 |
5187 |
18 |
6 |
0 |
0 |
0 |
0 |
| OW |
346 |
2033 |
223 |
248 |
14 |
0 |
0 |
0 |
| VODI |
18 |
464 |
297 |
925 |
487 |
114 |
0 |
0 |
| ODI |
0 |
31 |
53 |
486 |
2030 |
1490 |
14 |
0 |
| CDI |
0 |
2 |
16 |
207 |
3243 |
5747 |
79 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
186 |
46 |
0 |
|
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 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
8399 |
4725 |
7 |
3 |
0 |
0 |
0 |
0 |
| OW |
511 |
2102 |
217 |
185 |
0 |
0 |
0 |
0 |
| VODI |
30 |
565 |
317 |
1029 |
512 |
107 |
0 |
0 |
| ODI |
0 |
20 |
35 |
544 |
2206 |
1136 |
13 |
0 |
| CDI |
0 |
2 |
19 |
235 |
3308 |
5624 |
66 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
1 |
159 |
5 |
0 |
|
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