Validation of sea ice concentration - Asian sector
Bulletin date: 2025-10-30
Data source: OSI SAF N.H. multi-product sea ice concentration
Model vs. observations, sea ice class contingency tables
Date: 2025-10-24:
| 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 |
7998 |
2194 |
326 |
683 |
143 |
12 |
0 |
0 |
| OW |
30 |
53 |
92 |
817 |
595 |
196 |
4 |
0 |
| VODI |
17 |
20 |
1 |
517 |
960 |
543 |
91 |
0 |
| ODI |
1 |
0 |
0 |
28 |
869 |
490 |
143 |
0 |
| CDI |
0 |
0 |
0 |
6 |
625 |
1005 |
456 |
0 |
| VCDI |
1 |
0 |
0 |
1 |
66 |
4735 |
5074 |
4304 |
|
...date precedes bulletin
|
Date: 2025-10-26:
| 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 |
7808 |
1941 |
293 |
573 |
12 |
0 |
0 |
0 |
| OW |
23 |
50 |
117 |
814 |
349 |
16 |
1 |
0 |
| VODI |
20 |
6 |
13 |
476 |
973 |
208 |
11 |
0 |
| ODI |
3 |
0 |
0 |
56 |
1080 |
565 |
73 |
0 |
| CDI |
0 |
0 |
0 |
4 |
299 |
1352 |
307 |
0 |
| VCDI |
1 |
0 |
0 |
0 |
86 |
5532 |
5720 |
4314 |
|
...date precedes bulletin
|
Date: 2025-10-28:
| 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 |
7225 |
1582 |
122 |
183 |
7 |
0 |
0 |
0 |
| OW |
5 |
138 |
89 |
565 |
165 |
0 |
0 |
0 |
| VODI |
0 |
18 |
0 |
551 |
1263 |
114 |
0 |
0 |
| ODI |
0 |
2 |
0 |
35 |
741 |
785 |
34 |
0 |
| CDI |
0 |
1 |
0 |
0 |
446 |
1576 |
369 |
0 |
| VCDI |
0 |
0 |
1 |
0 |
32 |
5430 |
7557 |
4060 |
|
...date precedes bulletin
|
Date: 2025-10-30:
| 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 |
5950 |
2183 |
98 |
188 |
4 |
5 |
0 |
0 |
| OW |
17 |
197 |
51 |
199 |
70 |
22 |
0 |
0 |
| VODI |
0 |
23 |
22 |
260 |
492 |
434 |
51 |
0 |
| ODI |
0 |
1 |
0 |
12 |
416 |
1190 |
124 |
4 |
| CDI |
0 |
0 |
0 |
1 |
131 |
1047 |
470 |
13 |
| VCDI |
0 |
0 |
0 |
1 |
2 |
4678 |
9175 |
5565 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
5942 |
2223 |
99 |
217 |
4 |
9 |
0 |
0 |
| OW |
25 |
142 |
34 |
166 |
65 |
16 |
0 |
0 |
| VODI |
0 |
36 |
38 |
260 |
437 |
422 |
67 |
0 |
| ODI |
0 |
3 |
0 |
16 |
456 |
1117 |
145 |
3 |
| CDI |
0 |
0 |
0 |
1 |
151 |
1089 |
436 |
12 |
| VCDI |
0 |
0 |
0 |
1 |
2 |
4723 |
9172 |
5567 |
|
Date: 2025-11-01:
| 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 |
5176 |
2329 |
82 |
105 |
43 |
3 |
0 |
0 |
| OW |
79 |
368 |
45 |
203 |
67 |
12 |
0 |
0 |
| VODI |
1 |
13 |
0 |
170 |
285 |
143 |
90 |
0 |
| ODI |
0 |
0 |
0 |
71 |
199 |
617 |
484 |
5 |
| CDI |
0 |
0 |
0 |
13 |
90 |
666 |
1067 |
59 |
| VCDI |
0 |
0 |
0 |
0 |
7 |
1949 |
9687 |
8968 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
5124 |
2455 |
98 |
126 |
67 |
5 |
0 |
0 |
| OW |
130 |
250 |
29 |
203 |
48 |
18 |
0 |
0 |
| VODI |
2 |
5 |
0 |
142 |
267 |
124 |
65 |
0 |
| ODI |
0 |
0 |
0 |
65 |
204 |
558 |
440 |
3 |
| CDI |
0 |
0 |
0 |
21 |
85 |
692 |
1133 |
49 |
| VCDI |
0 |
0 |
0 |
5 |
20 |
1993 |
9690 |
8980 |
|
Date: 2025-11-03:
| 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 |
5344 |
2475 |
94 |
55 |
11 |
0 |
0 |
0 |
| OW |
54 |
170 |
32 |
234 |
46 |
0 |
0 |
0 |
| VODI |
0 |
0 |
0 |
127 |
170 |
0 |
0 |
0 |
| ODI |
0 |
0 |
0 |
17 |
396 |
76 |
189 |
9 |
| CDI |
0 |
0 |
0 |
6 |
289 |
569 |
398 |
168 |
| VCDI |
0 |
0 |
0 |
0 |
82 |
3430 |
8743 |
9912 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
5318 |
2420 |
93 |
141 |
40 |
0 |
0 |
0 |
| OW |
72 |
220 |
31 |
171 |
113 |
0 |
0 |
0 |
| VODI |
8 |
5 |
2 |
106 |
130 |
9 |
0 |
0 |
| ODI |
0 |
0 |
0 |
21 |
318 |
94 |
369 |
5 |
| CDI |
0 |
0 |
0 |
0 |
317 |
313 |
778 |
107 |
| VCDI |
0 |
0 |
0 |
0 |
76 |
3659 |
8183 |
9977 |
|
Date: 2025-11-05:
| 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 |
5046 |
2581 |
107 |
151 |
0 |
0 |
0 |
0 |
| OW |
70 |
161 |
28 |
223 |
86 |
0 |
0 |
0 |
| VODI |
0 |
0 |
3 |
68 |
215 |
5 |
0 |
0 |
| ODI |
0 |
0 |
0 |
14 |
158 |
62 |
0 |
5 |
| CDI |
0 |
0 |
0 |
0 |
190 |
523 |
61 |
41 |
| VCDI |
0 |
0 |
0 |
0 |
46 |
3423 |
7385 |
12444 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
5035 |
2050 |
85 |
104 |
21 |
0 |
0 |
0 |
| OW |
80 |
594 |
34 |
208 |
162 |
13 |
0 |
0 |
| VODI |
1 |
98 |
19 |
127 |
166 |
35 |
0 |
0 |
| ODI |
0 |
0 |
0 |
17 |
138 |
124 |
61 |
88 |
| CDI |
0 |
0 |
0 |
0 |
160 |
451 |
353 |
309 |
| VCDI |
0 |
0 |
0 |
0 |
48 |
3390 |
7032 |
12093 |
|
Date: 2025-11-07:
| 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 |
4126 |
2134 |
109 |
204 |
28 |
0 |
0 |
0 |
| OW |
170 |
629 |
89 |
374 |
83 |
0 |
0 |
0 |
| VODI |
9 |
60 |
21 |
93 |
243 |
32 |
0 |
0 |
| ODI |
0 |
0 |
0 |
34 |
132 |
148 |
2 |
0 |
| CDI |
0 |
0 |
0 |
13 |
76 |
389 |
102 |
4 |
| VCDI |
0 |
0 |
0 |
2 |
45 |
1815 |
8665 |
13265 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
4126 |
1447 |
39 |
82 |
5 |
0 |
0 |
0 |
| OW |
179 |
1119 |
122 |
288 |
87 |
30 |
0 |
0 |
| VODI |
0 |
257 |
58 |
306 |
246 |
127 |
0 |
0 |
| ODI |
0 |
0 |
0 |
44 |
170 |
84 |
22 |
4 |
| CDI |
0 |
0 |
0 |
0 |
83 |
346 |
325 |
321 |
| VCDI |
0 |
0 |
0 |
0 |
16 |
1797 |
8422 |
12944 |
|
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