Validation of sea ice concentration - Asian sector
Bulletin date: 2025-07-17
Data source: OSI SAF N.H. AMSR sea ice concentration
Model vs. observations, sea ice class contingency tables
Date: 2025-07-11:
| 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 |
2273 |
4355 |
49 |
40 |
15 |
0 |
0 |
0 |
| OW |
0 |
1133 |
210 |
231 |
77 |
9 |
0 |
0 |
| VODI |
0 |
384 |
256 |
952 |
644 |
13 |
0 |
0 |
| ODI |
0 |
86 |
92 |
435 |
1410 |
338 |
0 |
0 |
| CDI |
0 |
66 |
47 |
198 |
3335 |
7512 |
26 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
190 |
7132 |
574 |
0 |
|
...date precedes bulletin
|
Date: 2025-07-13:
| 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 |
2458 |
4056 |
39 |
25 |
21 |
0 |
0 |
0 |
| OW |
38 |
1331 |
224 |
274 |
83 |
13 |
0 |
0 |
| VODI |
0 |
593 |
286 |
985 |
624 |
16 |
0 |
0 |
| ODI |
0 |
156 |
108 |
521 |
1476 |
335 |
0 |
0 |
| CDI |
0 |
81 |
45 |
223 |
2626 |
7893 |
60 |
0 |
| VCDI |
0 |
0 |
0 |
5 |
152 |
7330 |
5 |
0 |
|
...date precedes bulletin
|
Date: 2025-07-15:
| 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 |
2789 |
4288 |
49 |
28 |
9 |
1 |
0 |
0 |
| OW |
2 |
1602 |
476 |
380 |
56 |
8 |
0 |
0 |
| VODI |
0 |
124 |
266 |
1404 |
602 |
16 |
0 |
0 |
| ODI |
0 |
4 |
12 |
266 |
2803 |
461 |
0 |
0 |
| CDI |
0 |
0 |
0 |
39 |
1343 |
13336 |
270 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
6 |
1305 |
137 |
0 |
|
...date precedes bulletin
|
Date: 2025-07-17:
| 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 |
2680 |
4444 |
43 |
40 |
2 |
0 |
0 |
0 |
| OW |
4 |
1944 |
405 |
373 |
46 |
4 |
0 |
0 |
| VODI |
0 |
360 |
386 |
1291 |
506 |
16 |
0 |
0 |
| ODI |
0 |
22 |
57 |
510 |
2712 |
148 |
2 |
0 |
| CDI |
0 |
0 |
3 |
80 |
1902 |
12785 |
437 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
793 |
87 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
2675 |
4594 |
57 |
51 |
0 |
0 |
0 |
0 |
| OW |
9 |
1780 |
380 |
351 |
55 |
3 |
0 |
0 |
| VODI |
0 |
372 |
389 |
1272 |
484 |
18 |
0 |
0 |
| ODI |
0 |
24 |
64 |
525 |
2704 |
359 |
2 |
0 |
| CDI |
0 |
0 |
4 |
95 |
1925 |
12526 |
409 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
840 |
115 |
0 |
|
Date: 2025-07-19:
| 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 |
2569 |
4612 |
62 |
24 |
3 |
0 |
0 |
0 |
| OW |
1 |
2279 |
431 |
391 |
43 |
7 |
0 |
0 |
| VODI |
0 |
673 |
361 |
1185 |
515 |
19 |
0 |
0 |
| ODI |
0 |
82 |
109 |
548 |
2453 |
125 |
0 |
0 |
| CDI |
0 |
2 |
12 |
96 |
3977 |
10236 |
924 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
303 |
40 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
2569 |
4735 |
79 |
31 |
3 |
0 |
0 |
0 |
| OW |
1 |
2110 |
383 |
370 |
39 |
7 |
0 |
0 |
| VODI |
0 |
695 |
382 |
1160 |
573 |
17 |
0 |
0 |
| ODI |
0 |
104 |
116 |
577 |
2466 |
262 |
0 |
0 |
| CDI |
0 |
4 |
15 |
106 |
3910 |
10156 |
906 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
248 |
58 |
0 |
|
Date: 2025-07-21:
| 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 |
2612 |
5597 |
83 |
43 |
6 |
0 |
0 |
0 |
| OW |
0 |
2752 |
735 |
481 |
30 |
0 |
0 |
0 |
| VODI |
0 |
33 |
166 |
1574 |
853 |
3 |
0 |
0 |
| ODI |
0 |
0 |
0 |
141 |
4063 |
481 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
1414 |
11005 |
10 |
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 |
2612 |
4832 |
63 |
40 |
10 |
0 |
0 |
0 |
| OW |
0 |
2582 |
382 |
356 |
69 |
4 |
0 |
0 |
| VODI |
0 |
801 |
386 |
1075 |
623 |
12 |
0 |
0 |
| ODI |
0 |
163 |
136 |
661 |
1990 |
399 |
0 |
0 |
| CDI |
0 |
4 |
17 |
107 |
3674 |
11047 |
10 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
27 |
0 |
0 |
|
Date: 2025-07-23:
| 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 |
2780 |
5956 |
83 |
28 |
5 |
0 |
0 |
0 |
| OW |
0 |
2886 |
584 |
455 |
59 |
0 |
0 |
0 |
| VODI |
0 |
146 |
270 |
1591 |
834 |
8 |
0 |
0 |
| ODI |
0 |
0 |
1 |
227 |
3622 |
332 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
4238 |
7969 |
8 |
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 |
2780 |
4844 |
62 |
30 |
8 |
0 |
0 |
0 |
| OW |
0 |
3123 |
348 |
366 |
75 |
1 |
0 |
0 |
| VODI |
0 |
798 |
402 |
1107 |
568 |
10 |
0 |
0 |
| ODI |
0 |
217 |
114 |
648 |
1990 |
311 |
0 |
0 |
| CDI |
0 |
6 |
12 |
150 |
6117 |
7717 |
8 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
270 |
0 |
0 |
|
Date: 2025-07-25:
| 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 |
3654 |
5891 |
50 |
6 |
5 |
0 |
0 |
0 |
| OW |
19 |
2995 |
480 |
439 |
53 |
1 |
0 |
0 |
| VODI |
0 |
371 |
331 |
1398 |
880 |
4 |
0 |
0 |
| ODI |
0 |
0 |
13 |
329 |
2804 |
608 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
2548 |
9199 |
0 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
4 |
0 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
3644 |
4466 |
30 |
10 |
8 |
0 |
0 |
0 |
| OW |
29 |
3236 |
320 |
373 |
86 |
0 |
0 |
0 |
| VODI |
0 |
1145 |
343 |
808 |
494 |
5 |
0 |
0 |
| ODI |
0 |
375 |
160 |
781 |
1518 |
384 |
0 |
0 |
| CDI |
0 |
35 |
21 |
200 |
3785 |
9039 |
0 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
399 |
388 |
0 |
0 |
|
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