Validation of sea ice concentration - Asian sector
Bulletin date: 2025-11-20
Data source: OSI SAF N.H. multi-product sea ice concentration
Model vs. observations, sea ice class contingency tables
Date: 2025-11-14:
| 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 |
1957 |
1561 |
30 |
66 |
0 |
0 |
0 |
0 |
| OW |
176 |
688 |
63 |
69 |
75 |
0 |
0 |
0 |
| VODI |
39 |
902 |
105 |
292 |
261 |
51 |
0 |
0 |
| ODI |
2 |
250 |
37 |
251 |
275 |
206 |
0 |
0 |
| CDI |
0 |
4 |
0 |
66 |
258 |
451 |
29 |
8 |
| VCDI |
0 |
12 |
0 |
12 |
147 |
2439 |
5783 |
16531 |
|
...date precedes bulletin
|
Date: 2025-11-16:
| 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 |
2230 |
2148 |
17 |
21 |
0 |
0 |
0 |
0 |
| OW |
216 |
568 |
65 |
145 |
83 |
0 |
0 |
0 |
| VODI |
167 |
319 |
86 |
150 |
232 |
55 |
0 |
0 |
| ODI |
0 |
67 |
16 |
199 |
215 |
156 |
0 |
0 |
| CDI |
0 |
20 |
10 |
105 |
537 |
290 |
3 |
2 |
| VCDI |
0 |
15 |
11 |
67 |
377 |
3964 |
6493 |
14047 |
|
...date precedes bulletin
|
Date: 2025-11-18:
| 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 |
1897 |
2841 |
31 |
11 |
0 |
0 |
0 |
0 |
| OW |
167 |
307 |
116 |
213 |
0 |
0 |
0 |
0 |
| VODI |
4 |
137 |
43 |
218 |
86 |
0 |
0 |
0 |
| ODI |
0 |
59 |
22 |
122 |
213 |
9 |
0 |
1 |
| CDI |
2 |
12 |
2 |
62 |
416 |
728 |
42 |
23 |
| VCDI |
14 |
0 |
0 |
18 |
392 |
3607 |
9191 |
12090 |
|
...date precedes bulletin
|
Date: 2025-11-20:
| 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 |
1354 |
2585 |
23 |
31 |
0 |
0 |
0 |
0 |
| OW |
141 |
598 |
54 |
81 |
0 |
0 |
0 |
0 |
| VODI |
3 |
238 |
62 |
225 |
91 |
2 |
0 |
0 |
| ODI |
1 |
95 |
5 |
104 |
259 |
68 |
0 |
0 |
| CDI |
5 |
30 |
13 |
39 |
273 |
488 |
123 |
2 |
| VCDI |
10 |
13 |
11 |
49 |
190 |
2270 |
8141 |
15419 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
1393 |
2603 |
22 |
40 |
0 |
0 |
0 |
0 |
| OW |
101 |
566 |
64 |
80 |
2 |
0 |
0 |
0 |
| VODI |
4 |
244 |
55 |
221 |
109 |
3 |
0 |
0 |
| ODI |
1 |
101 |
2 |
99 |
259 |
57 |
0 |
0 |
| CDI |
5 |
30 |
14 |
38 |
255 |
505 |
145 |
1 |
| VCDI |
10 |
15 |
11 |
51 |
188 |
2263 |
8119 |
15420 |
|
Date: 2025-11-22:
| 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 |
1010 |
2122 |
34 |
61 |
7 |
0 |
0 |
0 |
| OW |
23 |
381 |
30 |
92 |
3 |
0 |
0 |
0 |
| VODI |
0 |
745 |
65 |
298 |
143 |
0 |
0 |
0 |
| ODI |
0 |
52 |
9 |
164 |
214 |
78 |
0 |
1 |
| CDI |
0 |
5 |
5 |
85 |
194 |
609 |
60 |
11 |
| VCDI |
0 |
0 |
3 |
128 |
189 |
1617 |
5752 |
18906 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
1013 |
2171 |
46 |
67 |
8 |
0 |
0 |
0 |
| OW |
20 |
329 |
24 |
104 |
8 |
0 |
0 |
0 |
| VODI |
0 |
732 |
58 |
287 |
156 |
3 |
0 |
0 |
| ODI |
0 |
68 |
10 |
157 |
207 |
104 |
0 |
1 |
| CDI |
0 |
5 |
6 |
89 |
186 |
567 |
50 |
10 |
| VCDI |
0 |
0 |
2 |
124 |
185 |
1630 |
5762 |
18907 |
|
Date: 2025-11-24:
| 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 |
543 |
2343 |
66 |
84 |
4 |
0 |
0 |
0 |
| OW |
6 |
641 |
105 |
149 |
12 |
0 |
0 |
0 |
| VODI |
0 |
182 |
134 |
596 |
60 |
0 |
0 |
0 |
| ODI |
0 |
2 |
3 |
154 |
216 |
0 |
0 |
0 |
| CDI |
0 |
1 |
0 |
55 |
424 |
413 |
9 |
16 |
| VCDI |
0 |
0 |
0 |
33 |
118 |
1202 |
7482 |
18043 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
543 |
2319 |
73 |
115 |
14 |
0 |
0 |
0 |
| OW |
6 |
258 |
29 |
66 |
19 |
0 |
0 |
0 |
| VODI |
0 |
509 |
141 |
403 |
60 |
0 |
0 |
0 |
| ODI |
0 |
82 |
65 |
330 |
248 |
11 |
0 |
0 |
| CDI |
0 |
1 |
0 |
74 |
366 |
361 |
16 |
13 |
| VCDI |
0 |
0 |
0 |
83 |
127 |
1243 |
7475 |
18046 |
|
Date: 2025-11-26:
| 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 |
356 |
1974 |
67 |
55 |
0 |
0 |
0 |
0 |
| OW |
7 |
590 |
77 |
112 |
4 |
0 |
0 |
0 |
| VODI |
0 |
333 |
157 |
620 |
84 |
0 |
0 |
0 |
| ODI |
0 |
12 |
22 |
356 |
267 |
9 |
2 |
0 |
| CDI |
0 |
0 |
0 |
51 |
357 |
284 |
40 |
24 |
| VCDI |
0 |
0 |
0 |
1 |
152 |
1374 |
8837 |
16872 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
356 |
2179 |
85 |
99 |
3 |
0 |
0 |
0 |
| OW |
7 |
307 |
55 |
118 |
24 |
0 |
0 |
0 |
| VODI |
0 |
344 |
96 |
225 |
77 |
0 |
0 |
0 |
| ODI |
0 |
79 |
86 |
594 |
211 |
18 |
2 |
0 |
| CDI |
0 |
0 |
1 |
128 |
350 |
298 |
29 |
16 |
| VCDI |
0 |
0 |
0 |
31 |
199 |
1351 |
8848 |
16880 |
|
Date: 2025-11-28:
| 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 |
366 |
1845 |
75 |
63 |
0 |
0 |
0 |
0 |
| OW |
35 |
658 |
72 |
104 |
0 |
0 |
0 |
0 |
| VODI |
2 |
475 |
139 |
404 |
65 |
0 |
0 |
0 |
| ODI |
0 |
57 |
35 |
343 |
236 |
12 |
0 |
0 |
| CDI |
0 |
0 |
6 |
62 |
329 |
138 |
15 |
4 |
| VCDI |
0 |
0 |
0 |
6 |
263 |
1515 |
6959 |
18813 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
377 |
2233 |
96 |
148 |
14 |
0 |
0 |
0 |
| OW |
23 |
349 |
68 |
115 |
34 |
0 |
0 |
0 |
| VODI |
3 |
295 |
90 |
272 |
60 |
0 |
0 |
0 |
| ODI |
0 |
150 |
58 |
280 |
247 |
40 |
4 |
0 |
| CDI |
0 |
8 |
15 |
131 |
226 |
268 |
77 |
14 |
| VCDI |
0 |
0 |
0 |
36 |
312 |
1357 |
6893 |
18803 |
|
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