Validation of sea ice concentration - Asian sector
Bulletin date: 2025-09-18
Data source: OSI SAF N.H. AMSR sea ice concentration
Model vs. observations, sea ice class contingency tables
Date: 2025-09-12:
| 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 |
11616 |
4354 |
5 |
2 |
0 |
0 |
0 |
0 |
| OW |
0 |
1370 |
260 |
287 |
56 |
2 |
0 |
0 |
| VODI |
0 |
132 |
212 |
1439 |
724 |
41 |
0 |
0 |
| ODI |
0 |
0 |
0 |
159 |
1220 |
730 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
659 |
7050 |
829 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
522 |
413 |
0 |
|
...date precedes bulletin
|
Date: 2025-09-14:
| 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 |
11530 |
4347 |
12 |
5 |
0 |
0 |
0 |
0 |
| OW |
0 |
1368 |
236 |
329 |
120 |
5 |
0 |
0 |
| VODI |
0 |
230 |
206 |
1262 |
814 |
134 |
0 |
0 |
| ODI |
0 |
0 |
3 |
153 |
847 |
730 |
4 |
0 |
| CDI |
0 |
0 |
0 |
0 |
556 |
5631 |
346 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
2272 |
942 |
0 |
|
...date precedes bulletin
|
Date: 2025-09-16:
| 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 |
11614 |
4874 |
30 |
10 |
0 |
0 |
0 |
0 |
| OW |
0 |
1071 |
296 |
282 |
25 |
0 |
0 |
0 |
| VODI |
0 |
45 |
113 |
1121 |
392 |
14 |
0 |
0 |
| ODI |
0 |
0 |
2 |
149 |
925 |
195 |
0 |
0 |
| CDI |
0 |
0 |
0 |
4 |
637 |
6047 |
1004 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
4 |
569 |
2659 |
0 |
|
...date precedes bulletin
|
Date: 2025-09-18:
| 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 |
10151 |
6481 |
66 |
25 |
1 |
0 |
0 |
0 |
| OW |
0 |
1043 |
255 |
286 |
35 |
4 |
0 |
0 |
| VODI |
0 |
73 |
149 |
1071 |
403 |
24 |
0 |
0 |
| ODI |
0 |
0 |
3 |
211 |
699 |
296 |
2 |
0 |
| CDI |
0 |
0 |
0 |
4 |
343 |
5216 |
1155 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
31 |
1931 |
2124 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
10151 |
6527 |
84 |
34 |
1 |
0 |
0 |
0 |
| OW |
0 |
1005 |
239 |
280 |
33 |
1 |
0 |
0 |
| VODI |
0 |
65 |
147 |
1042 |
364 |
25 |
0 |
0 |
| ODI |
0 |
0 |
3 |
239 |
716 |
294 |
2 |
0 |
| CDI |
0 |
0 |
0 |
2 |
358 |
5035 |
1261 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
40 |
2116 |
2018 |
0 |
|
Date: 2025-09-20:
| 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 |
12172 |
4619 |
15 |
2 |
0 |
0 |
0 |
0 |
| OW |
1 |
1158 |
228 |
242 |
14 |
0 |
0 |
0 |
| VODI |
0 |
188 |
158 |
806 |
401 |
117 |
0 |
0 |
| ODI |
0 |
36 |
20 |
155 |
456 |
587 |
26 |
0 |
| CDI |
0 |
4 |
6 |
55 |
259 |
3406 |
2432 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
7 |
1805 |
2707 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
12172 |
4765 |
18 |
0 |
0 |
0 |
0 |
0 |
| OW |
1 |
1050 |
229 |
242 |
22 |
0 |
0 |
0 |
| VODI |
0 |
160 |
161 |
788 |
339 |
107 |
0 |
0 |
| ODI |
0 |
26 |
14 |
171 |
493 |
549 |
35 |
0 |
| CDI |
0 |
4 |
5 |
59 |
272 |
3412 |
2193 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
11 |
1847 |
2937 |
0 |
|
Date: 2025-09-22:
| 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 |
11998 |
4955 |
173 |
19 |
0 |
0 |
0 |
0 |
| OW |
1 |
599 |
323 |
223 |
0 |
0 |
0 |
0 |
| VODI |
0 |
11 |
85 |
809 |
192 |
7 |
0 |
0 |
| ODI |
0 |
0 |
0 |
271 |
568 |
76 |
0 |
0 |
| CDI |
0 |
0 |
0 |
62 |
558 |
1226 |
40 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
34 |
1338 |
8248 |
266 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
11998 |
4650 |
186 |
20 |
0 |
0 |
0 |
0 |
| OW |
1 |
729 |
235 |
311 |
57 |
5 |
0 |
0 |
| VODI |
0 |
174 |
141 |
691 |
442 |
141 |
0 |
0 |
| ODI |
0 |
12 |
19 |
310 |
581 |
302 |
31 |
0 |
| CDI |
0 |
0 |
0 |
52 |
272 |
1245 |
781 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
954 |
7476 |
266 |
|
Date: 2025-09-24:
| 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 |
11608 |
5270 |
59 |
9 |
0 |
0 |
0 |
0 |
| OW |
1 |
429 |
235 |
365 |
51 |
0 |
0 |
0 |
| VODI |
0 |
6 |
38 |
390 |
486 |
73 |
3 |
0 |
| ODI |
0 |
0 |
0 |
45 |
503 |
326 |
14 |
0 |
| CDI |
0 |
0 |
0 |
5 |
178 |
1107 |
483 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
2 |
522 |
7603 |
2271 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
11608 |
4862 |
53 |
44 |
3 |
0 |
0 |
0 |
| OW |
1 |
691 |
173 |
332 |
131 |
17 |
0 |
0 |
| VODI |
0 |
146 |
95 |
328 |
562 |
191 |
22 |
0 |
| ODI |
0 |
6 |
11 |
97 |
431 |
690 |
108 |
0 |
| CDI |
0 |
0 |
0 |
13 |
77 |
730 |
1198 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
16 |
400 |
6775 |
2271 |
|
Date: 2025-09-26:
| 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 |
11295 |
5186 |
82 |
25 |
0 |
0 |
0 |
0 |
| OW |
1 |
333 |
180 |
397 |
155 |
31 |
0 |
0 |
| VODI |
0 |
21 |
36 |
178 |
442 |
249 |
3 |
0 |
| ODI |
0 |
0 |
0 |
36 |
291 |
465 |
36 |
0 |
| CDI |
0 |
0 |
0 |
7 |
195 |
846 |
541 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
12 |
715 |
7672 |
2652 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
11295 |
4858 |
65 |
44 |
16 |
5 |
0 |
0 |
| OW |
1 |
563 |
150 |
303 |
257 |
127 |
0 |
0 |
| VODI |
0 |
113 |
73 |
179 |
333 |
534 |
58 |
0 |
| ODI |
0 |
6 |
10 |
98 |
318 |
568 |
290 |
0 |
| CDI |
0 |
0 |
0 |
19 |
169 |
602 |
919 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
2 |
470 |
6985 |
2652 |
|
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