Validation of sea ice concentration - Asian sector
Bulletin date: 2025-10-09
Data source: OSI SAF N.H. AMSR sea ice concentration
Model vs. observations, sea ice class contingency tables
Date: 2025-10-03:
| 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 |
10037 |
6414 |
79 |
27 |
1 |
0 |
0 |
0 |
| OW |
1 |
541 |
216 |
293 |
40 |
0 |
0 |
0 |
| VODI |
0 |
45 |
81 |
351 |
318 |
32 |
0 |
0 |
| ODI |
0 |
1 |
7 |
84 |
244 |
239 |
6 |
0 |
| CDI |
0 |
0 |
0 |
23 |
163 |
818 |
241 |
0 |
| VCDI |
0 |
0 |
0 |
1 |
25 |
1428 |
7235 |
3091 |
|
...date precedes bulletin
|
Date: 2025-10-05:
| 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 |
8849 |
6622 |
182 |
126 |
11 |
0 |
0 |
0 |
| OW |
1 |
910 |
195 |
256 |
67 |
7 |
0 |
0 |
| VODI |
0 |
159 |
96 |
383 |
309 |
54 |
0 |
0 |
| ODI |
0 |
24 |
22 |
129 |
246 |
220 |
15 |
0 |
| CDI |
0 |
0 |
7 |
57 |
218 |
652 |
240 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
43 |
2360 |
9455 |
167 |
|
...date precedes bulletin
|
Date: 2025-10-07:
| 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 |
8550 |
6821 |
191 |
123 |
12 |
0 |
0 |
0 |
| OW |
1 |
774 |
114 |
264 |
38 |
0 |
0 |
0 |
| VODI |
0 |
69 |
149 |
338 |
248 |
12 |
0 |
0 |
| ODI |
0 |
1 |
12 |
151 |
427 |
96 |
0 |
0 |
| CDI |
0 |
0 |
3 |
27 |
441 |
924 |
118 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
47 |
5217 |
6856 |
58 |
|
...date precedes bulletin
|
Date: 2025-10-09:
| 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 |
9850 |
5432 |
59 |
33 |
0 |
0 |
0 |
0 |
| OW |
26 |
696 |
135 |
276 |
36 |
0 |
0 |
0 |
| VODI |
0 |
202 |
107 |
299 |
301 |
27 |
0 |
0 |
| ODI |
0 |
85 |
20 |
91 |
364 |
196 |
12 |
0 |
| CDI |
0 |
55 |
51 |
105 |
365 |
933 |
385 |
0 |
| VCDI |
0 |
0 |
1 |
14 |
94 |
5674 |
5766 |
392 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
9856 |
5442 |
75 |
49 |
0 |
0 |
0 |
0 |
| OW |
20 |
656 |
119 |
288 |
49 |
0 |
0 |
0 |
| VODI |
0 |
234 |
103 |
255 |
296 |
39 |
0 |
0 |
| ODI |
0 |
77 |
22 |
103 |
345 |
214 |
23 |
0 |
| CDI |
0 |
61 |
52 |
106 |
372 |
885 |
428 |
0 |
| VCDI |
0 |
0 |
2 |
17 |
98 |
5692 |
5712 |
392 |
|
Date: 2025-10-11:
| 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 |
10195 |
4951 |
74 |
52 |
0 |
0 |
0 |
0 |
| OW |
42 |
932 |
121 |
194 |
32 |
0 |
0 |
0 |
| VODI |
2 |
295 |
128 |
334 |
234 |
20 |
0 |
0 |
| ODI |
0 |
128 |
29 |
134 |
321 |
112 |
34 |
0 |
| CDI |
0 |
183 |
51 |
133 |
481 |
1037 |
476 |
0 |
| VCDI |
0 |
6 |
7 |
20 |
59 |
5448 |
5685 |
132 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
10220 |
5004 |
81 |
54 |
0 |
0 |
0 |
0 |
| OW |
19 |
876 |
128 |
230 |
35 |
0 |
0 |
0 |
| VODI |
0 |
293 |
110 |
307 |
261 |
28 |
1 |
0 |
| ODI |
0 |
120 |
27 |
111 |
295 |
132 |
58 |
0 |
| CDI |
0 |
191 |
51 |
137 |
464 |
1039 |
529 |
0 |
| VCDI |
0 |
11 |
13 |
28 |
72 |
5418 |
5607 |
132 |
|
Date: 2025-10-13:
| 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 |
9366 |
5829 |
63 |
92 |
5 |
0 |
0 |
0 |
| OW |
20 |
1455 |
232 |
171 |
1 |
0 |
0 |
0 |
| VODI |
0 |
141 |
101 |
461 |
172 |
0 |
0 |
0 |
| ODI |
0 |
47 |
28 |
174 |
582 |
73 |
0 |
0 |
| CDI |
0 |
0 |
0 |
25 |
393 |
2350 |
131 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
2513 |
7655 |
2 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
9364 |
5487 |
87 |
149 |
6 |
0 |
0 |
0 |
| OW |
22 |
1153 |
81 |
142 |
24 |
0 |
0 |
0 |
| VODI |
0 |
490 |
127 |
243 |
190 |
2 |
0 |
0 |
| ODI |
0 |
140 |
65 |
180 |
304 |
93 |
15 |
0 |
| CDI |
0 |
197 |
55 |
176 |
517 |
1220 |
195 |
0 |
| VCDI |
0 |
5 |
9 |
33 |
112 |
3621 |
7576 |
2 |
|
Date: 2025-10-15:
| 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 |
8308 |
6364 |
117 |
112 |
15 |
0 |
0 |
0 |
| OW |
0 |
1092 |
229 |
415 |
81 |
0 |
0 |
0 |
| VODI |
0 |
155 |
56 |
324 |
470 |
29 |
0 |
0 |
| ODI |
0 |
28 |
66 |
69 |
412 |
217 |
0 |
0 |
| CDI |
0 |
1 |
24 |
203 |
297 |
1318 |
488 |
0 |
| VCDI |
0 |
0 |
0 |
13 |
104 |
4443 |
6601 |
31 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
8305 |
5630 |
103 |
200 |
31 |
0 |
0 |
0 |
| OW |
3 |
1201 |
115 |
160 |
89 |
0 |
0 |
0 |
| VODI |
0 |
451 |
131 |
268 |
300 |
29 |
0 |
0 |
| ODI |
0 |
125 |
37 |
143 |
363 |
145 |
7 |
0 |
| CDI |
0 |
116 |
14 |
99 |
299 |
600 |
247 |
0 |
| VCDI |
0 |
117 |
92 |
266 |
297 |
5233 |
6835 |
31 |
|
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 |
7800 |
6151 |
128 |
100 |
79 |
13 |
0 |
0 |
| OW |
10 |
1106 |
219 |
417 |
160 |
16 |
0 |
0 |
| VODI |
0 |
186 |
119 |
379 |
591 |
144 |
0 |
0 |
| ODI |
0 |
67 |
25 |
75 |
288 |
332 |
60 |
0 |
| CDI |
0 |
42 |
39 |
196 |
314 |
1095 |
732 |
0 |
| VCDI |
0 |
0 |
0 |
1 |
89 |
4857 |
6012 |
240 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
7782 |
5197 |
122 |
203 |
117 |
29 |
0 |
0 |
| OW |
28 |
1179 |
99 |
204 |
151 |
9 |
0 |
0 |
| VODI |
0 |
639 |
137 |
243 |
349 |
60 |
2 |
0 |
| ODI |
0 |
192 |
55 |
143 |
307 |
211 |
19 |
0 |
| CDI |
0 |
134 |
44 |
106 |
281 |
401 |
192 |
0 |
| VCDI |
0 |
211 |
73 |
269 |
316 |
5747 |
6591 |
240 |
|
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