Validation of sea ice concentration - Asian sector
Bulletin date: 2025-11-27
Data source: OSI SAF N.H. multi-product sea ice concentration
Model vs. observations, sea ice class contingency tables
Date: 2025-11-21:
| 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 |
1091 |
2226 |
30 |
41 |
1 |
0 |
0 |
0 |
| OW |
32 |
839 |
46 |
100 |
1 |
0 |
0 |
0 |
| VODI |
1 |
319 |
77 |
314 |
103 |
1 |
0 |
0 |
| ODI |
0 |
48 |
15 |
118 |
215 |
89 |
1 |
0 |
| CDI |
0 |
10 |
1 |
69 |
226 |
617 |
98 |
6 |
| VCDI |
0 |
13 |
0 |
99 |
129 |
1878 |
7682 |
16560 |
|
...date precedes bulletin
|
Date: 2025-11-23:
| 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 |
896 |
2124 |
52 |
54 |
1 |
0 |
0 |
0 |
| OW |
12 |
348 |
27 |
71 |
8 |
0 |
0 |
0 |
| VODI |
0 |
751 |
117 |
273 |
59 |
0 |
0 |
0 |
| ODI |
0 |
89 |
37 |
249 |
230 |
28 |
0 |
0 |
| CDI |
0 |
7 |
1 |
100 |
246 |
491 |
74 |
0 |
| VCDI |
0 |
0 |
0 |
105 |
148 |
1255 |
5752 |
19491 |
|
...date precedes bulletin
|
Date: 2025-11-25:
| 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 |
358 |
2214 |
76 |
113 |
0 |
0 |
0 |
0 |
| OW |
4 |
448 |
70 |
160 |
13 |
0 |
0 |
0 |
| VODI |
0 |
322 |
188 |
646 |
69 |
0 |
0 |
0 |
| ODI |
0 |
15 |
14 |
269 |
233 |
1 |
0 |
0 |
| CDI |
0 |
0 |
0 |
61 |
335 |
303 |
32 |
23 |
| VCDI |
0 |
0 |
0 |
25 |
97 |
1304 |
7422 |
18281 |
|
...date precedes bulletin
|
Date: 2025-11-27:
| 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 |
333 |
1798 |
67 |
74 |
1 |
0 |
0 |
0 |
| OW |
20 |
657 |
41 |
144 |
3 |
0 |
0 |
0 |
| VODI |
0 |
383 |
124 |
491 |
143 |
0 |
0 |
0 |
| ODI |
0 |
17 |
28 |
323 |
354 |
21 |
1 |
0 |
| CDI |
0 |
0 |
0 |
47 |
339 |
228 |
35 |
26 |
| VCDI |
0 |
0 |
0 |
0 |
193 |
1125 |
7341 |
18739 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
338 |
1831 |
73 |
88 |
1 |
0 |
0 |
0 |
| OW |
14 |
633 |
38 |
133 |
4 |
0 |
0 |
0 |
| VODI |
1 |
376 |
127 |
521 |
155 |
0 |
0 |
0 |
| ODI |
0 |
15 |
22 |
292 |
356 |
18 |
2 |
0 |
| CDI |
0 |
0 |
0 |
45 |
325 |
259 |
37 |
25 |
| VCDI |
0 |
0 |
0 |
0 |
192 |
1097 |
7338 |
18740 |
|
Date: 2025-11-29:
| 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 |
596 |
2035 |
66 |
37 |
0 |
0 |
0 |
0 |
| OW |
55 |
606 |
73 |
76 |
0 |
0 |
0 |
0 |
| VODI |
3 |
478 |
134 |
261 |
29 |
0 |
0 |
0 |
| ODI |
0 |
176 |
37 |
207 |
81 |
6 |
0 |
0 |
| CDI |
0 |
44 |
15 |
119 |
237 |
56 |
2 |
6 |
| VCDI |
0 |
7 |
15 |
212 |
457 |
2327 |
6163 |
18480 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
610 |
2172 |
69 |
40 |
0 |
0 |
0 |
0 |
| OW |
41 |
501 |
75 |
83 |
0 |
0 |
0 |
0 |
| VODI |
3 |
447 |
128 |
260 |
26 |
0 |
0 |
0 |
| ODI |
0 |
182 |
40 |
197 |
86 |
6 |
0 |
0 |
| CDI |
0 |
39 |
15 |
131 |
229 |
56 |
3 |
8 |
| VCDI |
0 |
5 |
13 |
201 |
463 |
2327 |
6162 |
18478 |
|
Date: 2025-12-01:
| 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 |
890 |
2124 |
71 |
16 |
0 |
0 |
0 |
0 |
| OW |
118 |
622 |
142 |
133 |
1 |
0 |
0 |
0 |
| VODI |
3 |
279 |
53 |
291 |
9 |
0 |
0 |
0 |
| ODI |
0 |
40 |
4 |
136 |
158 |
2 |
0 |
0 |
| CDI |
0 |
37 |
12 |
116 |
274 |
163 |
5 |
5 |
| VCDI |
0 |
94 |
40 |
167 |
237 |
2928 |
8539 |
15387 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
845 |
2049 |
70 |
17 |
0 |
0 |
0 |
0 |
| OW |
133 |
339 |
81 |
126 |
5 |
0 |
0 |
0 |
| VODI |
32 |
280 |
75 |
246 |
42 |
0 |
0 |
0 |
| ODI |
1 |
220 |
36 |
152 |
105 |
4 |
0 |
0 |
| CDI |
0 |
133 |
5 |
90 |
172 |
46 |
10 |
1 |
| VCDI |
0 |
175 |
55 |
228 |
355 |
3043 |
8534 |
15391 |
|
Date: 2025-12-03:
| 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 |
358 |
2210 |
95 |
37 |
0 |
0 |
0 |
0 |
| OW |
10 |
276 |
110 |
203 |
4 |
0 |
0 |
0 |
| VODI |
6 |
85 |
44 |
417 |
159 |
0 |
0 |
0 |
| ODI |
0 |
40 |
21 |
169 |
302 |
14 |
1 |
0 |
| CDI |
0 |
51 |
10 |
94 |
288 |
211 |
33 |
9 |
| VCDI |
0 |
4 |
4 |
151 |
388 |
1923 |
7833 |
17536 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
356 |
2155 |
54 |
34 |
0 |
0 |
0 |
0 |
| OW |
10 |
217 |
84 |
129 |
6 |
0 |
0 |
0 |
| VODI |
8 |
76 |
86 |
289 |
104 |
0 |
0 |
0 |
| ODI |
0 |
74 |
18 |
208 |
220 |
5 |
0 |
1 |
| CDI |
0 |
101 |
36 |
240 |
392 |
112 |
32 |
26 |
| VCDI |
0 |
43 |
6 |
171 |
419 |
2031 |
7835 |
17518 |
|
Date: 2025-12-05:
| 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 |
171 |
1812 |
45 |
47 |
0 |
0 |
0 |
0 |
| OW |
1 |
285 |
104 |
186 |
2 |
0 |
0 |
0 |
| VODI |
0 |
26 |
34 |
373 |
80 |
0 |
0 |
0 |
| ODI |
0 |
0 |
4 |
240 |
339 |
3 |
4 |
0 |
| CDI |
0 |
0 |
0 |
117 |
651 |
164 |
35 |
4 |
| VCDI |
0 |
0 |
0 |
20 |
670 |
1725 |
8567 |
17387 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
152 |
1585 |
43 |
95 |
0 |
0 |
0 |
0 |
| OW |
11 |
451 |
83 |
174 |
47 |
0 |
0 |
0 |
| VODI |
9 |
86 |
52 |
281 |
128 |
0 |
0 |
0 |
| ODI |
0 |
1 |
9 |
218 |
281 |
9 |
0 |
0 |
| CDI |
0 |
0 |
0 |
145 |
458 |
90 |
12 |
10 |
| VCDI |
0 |
0 |
0 |
70 |
828 |
1793 |
8594 |
17381 |
|
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