Validation of sea ice concentration - Asian sector
Bulletin date: 2025-07-24
Data source: OSI SAF N.H. multi-product 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 |
3157 |
4345 |
54 |
68 |
4 |
0 |
0 |
0 |
| OW |
8 |
1749 |
433 |
896 |
46 |
0 |
0 |
0 |
| VODI |
0 |
171 |
180 |
2017 |
476 |
0 |
0 |
0 |
| ODI |
0 |
1 |
1 |
469 |
3091 |
35 |
0 |
0 |
| CDI |
0 |
0 |
0 |
33 |
2876 |
11418 |
1215 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
347 |
6 |
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 |
3410 |
4247 |
41 |
35 |
10 |
0 |
0 |
0 |
| OW |
0 |
2411 |
404 |
712 |
58 |
0 |
0 |
0 |
| VODI |
0 |
420 |
240 |
1794 |
598 |
0 |
0 |
0 |
| ODI |
0 |
4 |
13 |
610 |
2563 |
121 |
0 |
0 |
| CDI |
0 |
0 |
0 |
23 |
2693 |
11325 |
1203 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
156 |
5 |
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 |
3905 |
4939 |
112 |
136 |
12 |
0 |
0 |
0 |
| OW |
17 |
2389 |
595 |
1140 |
28 |
0 |
0 |
0 |
| VODI |
0 |
49 |
46 |
2259 |
585 |
0 |
0 |
0 |
| ODI |
0 |
0 |
0 |
166 |
3951 |
349 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
2173 |
10128 |
117 |
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 |
5651 |
3934 |
94 |
42 |
3 |
0 |
0 |
0 |
| OW |
420 |
2398 |
575 |
749 |
46 |
0 |
0 |
0 |
| VODI |
11 |
74 |
171 |
2084 |
759 |
0 |
0 |
0 |
| ODI |
0 |
1 |
0 |
141 |
3648 |
272 |
0 |
0 |
| CDI |
0 |
0 |
0 |
3 |
3239 |
8781 |
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 |
5686 |
4068 |
127 |
43 |
3 |
0 |
0 |
0 |
| OW |
381 |
2208 |
534 |
834 |
51 |
0 |
0 |
0 |
| VODI |
15 |
128 |
179 |
1996 |
780 |
0 |
0 |
0 |
| ODI |
0 |
3 |
0 |
143 |
3781 |
329 |
0 |
0 |
| CDI |
0 |
0 |
0 |
3 |
3080 |
8652 |
0 |
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 |
5966 |
4549 |
39 |
28 |
0 |
0 |
0 |
0 |
| OW |
438 |
2610 |
481 |
651 |
31 |
0 |
0 |
0 |
| VODI |
0 |
250 |
248 |
1880 |
832 |
0 |
0 |
0 |
| ODI |
0 |
1 |
1 |
270 |
2942 |
372 |
0 |
0 |
| CDI |
0 |
0 |
0 |
4 |
2461 |
8955 |
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 |
6043 |
4648 |
84 |
59 |
0 |
0 |
0 |
0 |
| OW |
361 |
2466 |
446 |
712 |
40 |
0 |
0 |
0 |
| VODI |
0 |
291 |
237 |
1799 |
701 |
0 |
0 |
0 |
| ODI |
0 |
5 |
2 |
258 |
2906 |
826 |
0 |
0 |
| CDI |
0 |
0 |
0 |
5 |
2619 |
8478 |
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 |
5994 |
6369 |
85 |
73 |
2 |
0 |
0 |
0 |
| OW |
181 |
1772 |
675 |
872 |
16 |
0 |
0 |
0 |
| VODI |
0 |
21 |
34 |
1743 |
522 |
0 |
0 |
0 |
| ODI |
0 |
0 |
0 |
75 |
4310 |
345 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
1033 |
8974 |
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 |
5862 |
5261 |
120 |
60 |
1 |
0 |
0 |
0 |
| OW |
313 |
2590 |
409 |
709 |
35 |
0 |
0 |
0 |
| VODI |
0 |
307 |
261 |
1668 |
689 |
0 |
0 |
0 |
| ODI |
0 |
4 |
4 |
309 |
2710 |
1470 |
0 |
0 |
| CDI |
0 |
0 |
0 |
17 |
2441 |
7679 |
0 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
7 |
170 |
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 |
6560 |
6193 |
94 |
59 |
2 |
0 |
0 |
0 |
| OW |
147 |
1814 |
538 |
667 |
8 |
0 |
0 |
0 |
| VODI |
0 |
68 |
72 |
1788 |
468 |
0 |
0 |
0 |
| ODI |
0 |
0 |
0 |
122 |
3634 |
2377 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
524 |
7961 |
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 |
6470 |
4923 |
110 |
88 |
0 |
0 |
0 |
0 |
| OW |
237 |
2818 |
317 |
581 |
44 |
0 |
0 |
0 |
| VODI |
0 |
333 |
268 |
1620 |
658 |
29 |
0 |
0 |
| ODI |
0 |
1 |
9 |
336 |
2259 |
3082 |
0 |
0 |
| CDI |
0 |
0 |
0 |
11 |
1675 |
7199 |
0 |
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 |
6680 |
6117 |
57 |
16 |
2 |
0 |
0 |
0 |
| OW |
139 |
1956 |
411 |
611 |
10 |
0 |
0 |
0 |
| VODI |
0 |
125 |
127 |
1760 |
538 |
0 |
0 |
0 |
| ODI |
0 |
2 |
1 |
163 |
3558 |
4617 |
70 |
0 |
| CDI |
0 |
0 |
0 |
0 |
912 |
4946 |
278 |
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 |
6606 |
4973 |
81 |
159 |
7 |
0 |
0 |
0 |
| OW |
213 |
2842 |
303 |
671 |
60 |
0 |
0 |
0 |
| VODI |
0 |
376 |
198 |
1483 |
715 |
13 |
0 |
0 |
| ODI |
0 |
9 |
14 |
230 |
2622 |
3582 |
124 |
0 |
| CDI |
0 |
0 |
0 |
7 |
1616 |
5880 |
224 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
88 |
0 |
0 |
|
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