Validation of sea ice concentration - Asian sector
Bulletin date: 2025-10-30
Data source: OSI SAF N.H. AMSR 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 |
7049 |
2709 |
344 |
551 |
191 |
20 |
0 |
0 |
| OW |
15 |
129 |
167 |
673 |
496 |
260 |
1 |
0 |
| VODI |
0 |
25 |
18 |
565 |
767 |
655 |
32 |
0 |
| ODI |
0 |
0 |
4 |
62 |
725 |
513 |
115 |
0 |
| CDI |
0 |
0 |
0 |
9 |
505 |
846 |
489 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
53 |
4114 |
7676 |
2304 |
|
...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 |
6895 |
2563 |
269 |
381 |
39 |
0 |
0 |
0 |
| OW |
12 |
198 |
161 |
613 |
332 |
19 |
2 |
0 |
| VODI |
1 |
43 |
46 |
477 |
880 |
196 |
14 |
0 |
| ODI |
0 |
8 |
5 |
107 |
1019 |
546 |
35 |
0 |
| CDI |
0 |
2 |
0 |
11 |
304 |
1248 |
350 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
106 |
4227 |
8335 |
2638 |
|
...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 |
6941 |
1558 |
57 |
77 |
21 |
0 |
0 |
0 |
| OW |
19 |
189 |
162 |
361 |
188 |
9 |
0 |
0 |
| VODI |
0 |
7 |
21 |
447 |
1148 |
279 |
0 |
0 |
| ODI |
0 |
0 |
0 |
30 |
598 |
838 |
68 |
0 |
| CDI |
0 |
0 |
0 |
2 |
373 |
1423 |
500 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
27 |
4058 |
9440 |
3241 |
|
...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 |
5469 |
2364 |
74 |
77 |
18 |
6 |
0 |
0 |
| OW |
2 |
248 |
56 |
120 |
64 |
19 |
0 |
0 |
| VODI |
0 |
78 |
70 |
194 |
375 |
421 |
99 |
0 |
| ODI |
0 |
0 |
0 |
17 |
247 |
1290 |
179 |
0 |
| CDI |
0 |
0 |
0 |
0 |
75 |
976 |
549 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
6 |
3771 |
11332 |
3886 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
5468 |
2396 |
78 |
94 |
27 |
7 |
0 |
0 |
| OW |
3 |
185 |
51 |
92 |
55 |
16 |
0 |
0 |
| VODI |
0 |
109 |
71 |
196 |
337 |
396 |
117 |
0 |
| ODI |
0 |
0 |
0 |
25 |
274 |
1220 |
196 |
0 |
| CDI |
0 |
0 |
0 |
1 |
88 |
1040 |
506 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
4 |
3804 |
11340 |
3886 |
|
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 |
4165 |
2905 |
123 |
145 |
35 |
1 |
0 |
0 |
| OW |
32 |
356 |
92 |
154 |
70 |
16 |
1 |
0 |
| VODI |
0 |
14 |
13 |
157 |
233 |
135 |
99 |
0 |
| ODI |
0 |
0 |
0 |
88 |
167 |
632 |
479 |
0 |
| CDI |
0 |
0 |
0 |
22 |
60 |
718 |
1051 |
3 |
| VCDI |
0 |
0 |
0 |
0 |
3 |
1464 |
11667 |
6982 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
4120 |
3020 |
127 |
172 |
50 |
6 |
0 |
0 |
| OW |
76 |
244 |
92 |
133 |
66 |
18 |
1 |
0 |
| VODI |
1 |
11 |
9 |
143 |
204 |
130 |
63 |
0 |
| ODI |
0 |
0 |
0 |
76 |
185 |
539 |
457 |
0 |
| CDI |
0 |
0 |
0 |
35 |
54 |
761 |
1098 |
2 |
| VCDI |
0 |
0 |
0 |
7 |
9 |
1512 |
11678 |
6983 |
|
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 |
5476 |
2059 |
28 |
29 |
0 |
0 |
0 |
0 |
| OW |
48 |
247 |
98 |
111 |
5 |
0 |
0 |
0 |
| VODI |
0 |
3 |
12 |
136 |
112 |
3 |
0 |
0 |
| ODI |
0 |
0 |
2 |
12 |
364 |
81 |
194 |
5 |
| CDI |
0 |
0 |
0 |
4 |
265 |
595 |
444 |
106 |
| VCDI |
0 |
0 |
0 |
0 |
70 |
2943 |
11056 |
7574 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
5451 |
2027 |
53 |
86 |
20 |
1 |
0 |
0 |
| OW |
67 |
255 |
51 |
105 |
70 |
22 |
0 |
0 |
| VODI |
6 |
25 |
31 |
56 |
66 |
38 |
0 |
0 |
| ODI |
0 |
2 |
4 |
31 |
272 |
124 |
342 |
1 |
| CDI |
0 |
0 |
1 |
14 |
298 |
320 |
839 |
19 |
| VCDI |
0 |
0 |
0 |
0 |
90 |
3117 |
10513 |
7665 |
|
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 |
4587 |
2739 |
99 |
77 |
10 |
0 |
0 |
0 |
| OW |
42 |
230 |
64 |
141 |
62 |
1 |
0 |
0 |
| VODI |
0 |
9 |
10 |
65 |
161 |
26 |
0 |
0 |
| ODI |
0 |
0 |
1 |
18 |
83 |
102 |
2 |
4 |
| CDI |
0 |
0 |
1 |
5 |
193 |
470 |
83 |
26 |
| VCDI |
0 |
0 |
0 |
0 |
23 |
2959 |
10291 |
9498 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
4551 |
2218 |
94 |
64 |
17 |
1 |
0 |
0 |
| OW |
78 |
625 |
53 |
128 |
131 |
25 |
0 |
0 |
| VODI |
0 |
134 |
27 |
88 |
101 |
64 |
0 |
0 |
| ODI |
0 |
1 |
1 |
19 |
91 |
133 |
142 |
11 |
| CDI |
0 |
0 |
0 |
7 |
167 |
410 |
614 |
49 |
| VCDI |
0 |
0 |
0 |
0 |
25 |
2925 |
9620 |
9468 |
|
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 |
2541 |
3442 |
116 |
157 |
24 |
0 |
0 |
0 |
| OW |
99 |
713 |
71 |
318 |
94 |
0 |
0 |
0 |
| VODI |
0 |
89 |
18 |
64 |
216 |
39 |
0 |
0 |
| ODI |
0 |
4 |
6 |
22 |
89 |
179 |
2 |
0 |
| CDI |
0 |
2 |
1 |
10 |
47 |
393 |
96 |
0 |
| VCDI |
0 |
1 |
2 |
6 |
16 |
1312 |
12077 |
9816 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
2522 |
2747 |
64 |
71 |
4 |
0 |
0 |
0 |
| OW |
118 |
1226 |
97 |
208 |
84 |
36 |
0 |
0 |
| VODI |
0 |
274 |
48 |
267 |
207 |
130 |
2 |
0 |
| ODI |
0 |
4 |
4 |
25 |
146 |
107 |
32 |
0 |
| CDI |
0 |
0 |
1 |
6 |
39 |
352 |
529 |
115 |
| VCDI |
0 |
0 |
0 |
0 |
6 |
1298 |
11612 |
9701 |
|
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