Validation of sea ice concentration - Asian sector
Bulletin date: 2025-07-24
Data source: OSI SAF N.H. AMSR sea ice concentration
Model vs. observations, sea ice class contingency tables
Date: 2025-07-18:
| 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 |
2611 |
4548 |
41 |
31 |
2 |
1 |
0 |
0 |
| OW |
1 |
2061 |
435 |
394 |
43 |
12 |
0 |
0 |
| VODI |
0 |
501 |
391 |
1279 |
489 |
15 |
0 |
0 |
| ODI |
0 |
45 |
68 |
591 |
2576 |
130 |
1 |
0 |
| CDI |
0 |
2 |
9 |
92 |
3714 |
10675 |
971 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
337 |
16 |
0 |
|
...date precedes bulletin
|
Date: 2025-07-20:
| 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 |
2589 |
4648 |
50 |
23 |
5 |
0 |
0 |
0 |
| OW |
0 |
2574 |
408 |
346 |
49 |
6 |
0 |
0 |
| VODI |
0 |
777 |
385 |
1128 |
563 |
22 |
0 |
0 |
| ODI |
0 |
115 |
131 |
588 |
2228 |
153 |
0 |
0 |
| CDI |
0 |
5 |
15 |
84 |
4265 |
10490 |
274 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
160 |
1 |
0 |
|
...date precedes bulletin
|
Date: 2025-07-22:
| 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 |
2808 |
5640 |
103 |
46 |
9 |
0 |
0 |
0 |
| OW |
0 |
2824 |
657 |
452 |
44 |
0 |
0 |
0 |
| VODI |
0 |
72 |
235 |
1771 |
665 |
1 |
0 |
0 |
| ODI |
0 |
0 |
0 |
263 |
3775 |
374 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
2865 |
9378 |
100 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
...date precedes bulletin
|
Date: 2025-07-24:
| 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 |
3505 |
5600 |
53 |
9 |
5 |
0 |
0 |
0 |
| OW |
22 |
2984 |
515 |
415 |
53 |
1 |
0 |
0 |
| VODI |
0 |
280 |
303 |
1468 |
882 |
11 |
0 |
0 |
| ODI |
0 |
0 |
2 |
269 |
3154 |
576 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
3241 |
8733 |
1 |
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 |
3520 |
5769 |
57 |
7 |
6 |
0 |
0 |
0 |
| OW |
7 |
2746 |
510 |
478 |
68 |
1 |
0 |
0 |
| VODI |
0 |
349 |
304 |
1417 |
880 |
11 |
0 |
0 |
| ODI |
0 |
0 |
2 |
259 |
3306 |
629 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
3075 |
8608 |
1 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
72 |
0 |
0 |
|
Date: 2025-07-26:
| 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 |
4277 |
5637 |
28 |
15 |
1 |
0 |
0 |
0 |
| OW |
237 |
2868 |
448 |
441 |
39 |
1 |
0 |
0 |
| VODI |
0 |
486 |
337 |
1291 |
944 |
16 |
0 |
0 |
| ODI |
0 |
12 |
28 |
370 |
2548 |
584 |
0 |
0 |
| CDI |
0 |
0 |
0 |
5 |
3059 |
8323 |
0 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
87 |
0 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
4357 |
5770 |
67 |
24 |
1 |
0 |
0 |
0 |
| OW |
157 |
2696 |
424 |
503 |
50 |
1 |
0 |
0 |
| VODI |
0 |
525 |
328 |
1234 |
820 |
4 |
0 |
0 |
| ODI |
0 |
12 |
22 |
343 |
2607 |
962 |
0 |
0 |
| CDI |
0 |
0 |
0 |
18 |
3113 |
7934 |
0 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
110 |
0 |
0 |
|
Date: 2025-07-28:
| 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 |
4559 |
7184 |
57 |
31 |
2 |
0 |
0 |
0 |
| OW |
32 |
2205 |
665 |
423 |
10 |
2 |
0 |
0 |
| VODI |
0 |
16 |
111 |
1487 |
614 |
0 |
0 |
0 |
| ODI |
0 |
0 |
0 |
119 |
4077 |
501 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
1490 |
8497 |
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 |
4507 |
5988 |
97 |
50 |
2 |
0 |
0 |
0 |
| OW |
84 |
2842 |
380 |
507 |
65 |
2 |
0 |
0 |
| VODI |
0 |
559 |
328 |
1143 |
765 |
25 |
0 |
0 |
| ODI |
0 |
16 |
28 |
354 |
2436 |
1616 |
0 |
0 |
| CDI |
0 |
0 |
0 |
6 |
2913 |
7192 |
0 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
12 |
165 |
0 |
0 |
|
Date: 2025-07-30:
| 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 |
5119 |
7005 |
59 |
18 |
1 |
0 |
0 |
0 |
| OW |
0 |
2201 |
437 |
354 |
12 |
3 |
0 |
0 |
| VODI |
0 |
96 |
244 |
1374 |
578 |
5 |
0 |
0 |
| ODI |
0 |
0 |
1 |
233 |
3447 |
2422 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
843 |
7588 |
42 |
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 |
5098 |
5675 |
79 |
57 |
3 |
0 |
0 |
0 |
| OW |
21 |
3029 |
306 |
392 |
68 |
9 |
0 |
0 |
| VODI |
0 |
581 |
325 |
1141 |
666 |
96 |
0 |
0 |
| ODI |
0 |
17 |
31 |
371 |
2173 |
3037 |
12 |
0 |
| CDI |
0 |
0 |
0 |
18 |
1971 |
6848 |
30 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
28 |
0 |
0 |
|
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 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
5101 |
5837 |
102 |
71 |
24 |
1 |
0 |
0 |
| OW |
10 |
3024 |
340 |
443 |
99 |
4 |
0 |
0 |
| VODI |
0 |
512 |
306 |
1099 |
678 |
77 |
0 |
0 |
| ODI |
0 |
29 |
29 |
330 |
2447 |
3616 |
97 |
0 |
| CDI |
0 |
0 |
0 |
26 |
1476 |
5866 |
350 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
88 |
0 |
0 |
|
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