Validation of sea ice concentration - Asian sector
Bulletin date: 2025-10-23
Data source: OSI SAF N.H. multi-product sea ice concentration
Model vs. observations, sea ice class contingency tables
Date: 2025-10-17:
| 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 |
8988 |
5485 |
218 |
188 |
96 |
0 |
0 |
0 |
| OW |
350 |
752 |
209 |
671 |
166 |
10 |
0 |
0 |
| VODI |
101 |
114 |
57 |
453 |
662 |
103 |
0 |
0 |
| ODI |
1 |
36 |
27 |
86 |
333 |
348 |
19 |
0 |
| CDI |
0 |
4 |
24 |
225 |
326 |
1166 |
678 |
0 |
| VCDI |
1 |
0 |
0 |
1 |
127 |
5900 |
4669 |
502 |
|
...date precedes bulletin
|
Date: 2025-10-19:
| 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 |
8375 |
5292 |
209 |
342 |
81 |
0 |
0 |
0 |
| OW |
52 |
1182 |
209 |
546 |
295 |
21 |
0 |
0 |
| VODI |
17 |
368 |
116 |
486 |
536 |
302 |
0 |
0 |
| ODI |
0 |
39 |
39 |
131 |
248 |
502 |
29 |
0 |
| CDI |
0 |
1 |
21 |
236 |
261 |
851 |
551 |
0 |
| VCDI |
1 |
0 |
0 |
0 |
168 |
5082 |
5374 |
1133 |
|
...date precedes bulletin
|
Date: 2025-10-21:
| 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 |
8151 |
4412 |
375 |
409 |
176 |
0 |
0 |
0 |
| OW |
24 |
543 |
289 |
794 |
280 |
4 |
0 |
0 |
| VODI |
15 |
57 |
29 |
908 |
649 |
108 |
0 |
0 |
| ODI |
2 |
2 |
1 |
173 |
552 |
267 |
4 |
0 |
| CDI |
1 |
0 |
0 |
22 |
434 |
1520 |
244 |
0 |
| VCDI |
1 |
0 |
0 |
0 |
0 |
4422 |
4796 |
3432 |
|
...date precedes bulletin
|
Date: 2025-10-23:
| 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 |
8163 |
2645 |
378 |
655 |
91 |
41 |
0 |
0 |
| OW |
30 |
128 |
174 |
963 |
538 |
227 |
0 |
0 |
| VODI |
14 |
22 |
7 |
699 |
807 |
391 |
4 |
0 |
| ODI |
0 |
0 |
4 |
149 |
851 |
540 |
69 |
0 |
| CDI |
1 |
0 |
2 |
16 |
528 |
929 |
314 |
0 |
| VCDI |
1 |
0 |
0 |
1 |
46 |
4895 |
4872 |
3901 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
8188 |
2669 |
419 |
832 |
286 |
85 |
0 |
0 |
| OW |
11 |
94 |
124 |
821 |
370 |
234 |
0 |
0 |
| VODI |
8 |
32 |
16 |
686 |
858 |
392 |
5 |
0 |
| ODI |
0 |
0 |
6 |
135 |
759 |
480 |
93 |
0 |
| CDI |
1 |
0 |
0 |
9 |
542 |
849 |
338 |
0 |
| VCDI |
1 |
0 |
0 |
0 |
46 |
4983 |
4823 |
3901 |
|
Date: 2025-10-25:
| 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 |
7929 |
1917 |
340 |
663 |
61 |
0 |
0 |
0 |
| OW |
28 |
59 |
73 |
774 |
526 |
54 |
0 |
0 |
| VODI |
12 |
1 |
0 |
450 |
889 |
636 |
27 |
0 |
| ODI |
1 |
0 |
0 |
48 |
945 |
673 |
137 |
0 |
| CDI |
0 |
0 |
0 |
2 |
468 |
1079 |
397 |
0 |
| VCDI |
1 |
0 |
0 |
0 |
101 |
5040 |
5854 |
3911 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
7951 |
1936 |
353 |
621 |
144 |
14 |
0 |
0 |
| OW |
11 |
40 |
60 |
840 |
455 |
126 |
1 |
0 |
| VODI |
7 |
1 |
0 |
415 |
943 |
656 |
33 |
0 |
| ODI |
1 |
0 |
0 |
55 |
886 |
602 |
168 |
0 |
| CDI |
0 |
0 |
0 |
6 |
427 |
1032 |
395 |
0 |
| VCDI |
1 |
0 |
0 |
0 |
135 |
5052 |
5818 |
3911 |
|
Date: 2025-10-27:
| 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 |
7557 |
1697 |
285 |
345 |
4 |
0 |
0 |
0 |
| OW |
27 |
14 |
51 |
931 |
107 |
0 |
0 |
0 |
| VODI |
16 |
0 |
0 |
556 |
1089 |
21 |
0 |
0 |
| ODI |
3 |
0 |
0 |
28 |
1134 |
949 |
155 |
0 |
| CDI |
0 |
0 |
0 |
0 |
409 |
1825 |
486 |
5 |
| VCDI |
1 |
0 |
0 |
0 |
44 |
5214 |
6573 |
3570 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
7575 |
1702 |
306 |
617 |
95 |
0 |
0 |
0 |
| OW |
10 |
8 |
30 |
807 |
449 |
20 |
0 |
0 |
| VODI |
15 |
1 |
0 |
338 |
1049 |
257 |
0 |
0 |
| ODI |
3 |
0 |
0 |
92 |
788 |
675 |
9 |
0 |
| CDI |
0 |
0 |
0 |
6 |
330 |
1438 |
222 |
0 |
| VCDI |
1 |
0 |
0 |
0 |
76 |
5619 |
6983 |
3575 |
|
Date: 2025-10-29:
| 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 |
6821 |
1805 |
80 |
97 |
18 |
0 |
0 |
0 |
| OW |
22 |
124 |
37 |
178 |
149 |
3 |
0 |
0 |
| VODI |
0 |
26 |
31 |
482 |
769 |
376 |
0 |
0 |
| ODI |
0 |
0 |
0 |
30 |
871 |
801 |
98 |
0 |
| CDI |
0 |
0 |
0 |
0 |
210 |
1243 |
431 |
0 |
| VCDI |
0 |
0 |
0 |
2 |
5 |
4795 |
8757 |
4835 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
6830 |
1904 |
142 |
389 |
181 |
12 |
0 |
0 |
| OW |
13 |
47 |
6 |
336 |
424 |
154 |
0 |
0 |
| VODI |
0 |
4 |
0 |
59 |
943 |
637 |
36 |
0 |
| ODI |
0 |
0 |
0 |
3 |
317 |
843 |
211 |
0 |
| CDI |
0 |
0 |
0 |
1 |
148 |
1181 |
940 |
3 |
| VCDI |
0 |
0 |
0 |
1 |
9 |
4391 |
8099 |
4832 |
|
Date: 2025-10-31:
| 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 |
5295 |
2442 |
68 |
219 |
35 |
4 |
0 |
0 |
| OW |
67 |
208 |
23 |
210 |
68 |
26 |
0 |
0 |
| VODI |
0 |
2 |
2 |
328 |
333 |
251 |
93 |
0 |
| ODI |
0 |
0 |
0 |
27 |
186 |
1107 |
342 |
0 |
| CDI |
0 |
0 |
0 |
5 |
90 |
904 |
673 |
30 |
| VCDI |
0 |
0 |
0 |
0 |
4 |
4120 |
8416 |
7518 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
5362 |
2628 |
76 |
498 |
63 |
15 |
21 |
0 |
| OW |
0 |
24 |
15 |
213 |
255 |
229 |
63 |
0 |
| VODI |
0 |
0 |
2 |
77 |
295 |
803 |
234 |
0 |
| ODI |
0 |
0 |
0 |
1 |
77 |
834 |
378 |
6 |
| CDI |
0 |
0 |
0 |
0 |
24 |
964 |
1011 |
53 |
| VCDI |
0 |
0 |
0 |
0 |
2 |
3567 |
7817 |
7489 |
|
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