Validation of sea ice concentration - Asian sector
Bulletin date: 2025-09-25
Data source: OSI SAF N.H. AMSR sea ice concentration
Model vs. observations, sea ice class contingency tables
Date: 2025-09-19:
| 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 |
12073 |
4689 |
28 |
15 |
0 |
0 |
0 |
0 |
| OW |
1 |
1159 |
196 |
240 |
13 |
0 |
0 |
0 |
| VODI |
0 |
187 |
161 |
883 |
398 |
73 |
0 |
0 |
| ODI |
0 |
29 |
18 |
181 |
504 |
457 |
19 |
0 |
| CDI |
0 |
5 |
7 |
82 |
450 |
4420 |
1990 |
0 |
| VCDI |
0 |
0 |
0 |
2 |
33 |
2065 |
1704 |
0 |
|
...date precedes bulletin
|
Date: 2025-09-21:
| 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 |
12260 |
4534 |
22 |
0 |
0 |
0 |
0 |
0 |
| OW |
1 |
1051 |
197 |
290 |
33 |
0 |
0 |
0 |
| VODI |
0 |
198 |
119 |
692 |
523 |
163 |
0 |
0 |
| ODI |
0 |
42 |
17 |
142 |
369 |
584 |
97 |
0 |
| CDI |
0 |
7 |
4 |
44 |
214 |
1609 |
2128 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
1020 |
5722 |
0 |
|
...date precedes bulletin
|
Date: 2025-09-23:
| 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 |
11714 |
5247 |
58 |
15 |
0 |
0 |
0 |
0 |
| OW |
1 |
489 |
245 |
358 |
27 |
0 |
0 |
0 |
| VODI |
0 |
3 |
39 |
519 |
430 |
45 |
2 |
0 |
| ODI |
0 |
0 |
0 |
102 |
493 |
284 |
15 |
0 |
| CDI |
0 |
0 |
0 |
1 |
206 |
1156 |
465 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
7 |
524 |
7491 |
2146 |
|
...date precedes bulletin
|
Date: 2025-09-25:
| 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 |
11428 |
5282 |
78 |
13 |
0 |
0 |
0 |
0 |
| OW |
1 |
353 |
201 |
416 |
87 |
1 |
0 |
0 |
| VODI |
0 |
9 |
35 |
260 |
536 |
89 |
3 |
0 |
| ODI |
0 |
0 |
0 |
39 |
508 |
320 |
17 |
0 |
| CDI |
0 |
0 |
0 |
1 |
230 |
936 |
451 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
16 |
615 |
7721 |
2436 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
11428 |
5363 |
140 |
53 |
0 |
0 |
0 |
0 |
| OW |
1 |
274 |
139 |
411 |
109 |
2 |
0 |
0 |
| VODI |
0 |
7 |
35 |
239 |
559 |
102 |
6 |
0 |
| ODI |
0 |
0 |
0 |
26 |
461 |
352 |
20 |
0 |
| CDI |
0 |
0 |
0 |
0 |
216 |
900 |
419 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
32 |
605 |
7747 |
2436 |
|
Date: 2025-09-27:
| 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 |
11219 |
5091 |
50 |
31 |
0 |
0 |
0 |
0 |
| OW |
1 |
509 |
172 |
257 |
136 |
11 |
0 |
0 |
| VODI |
0 |
58 |
39 |
233 |
414 |
234 |
19 |
0 |
| ODI |
0 |
4 |
11 |
41 |
267 |
385 |
105 |
0 |
| CDI |
0 |
0 |
3 |
17 |
117 |
810 |
623 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
5 |
857 |
7951 |
2412 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
11219 |
5183 |
82 |
72 |
5 |
0 |
0 |
0 |
| OW |
1 |
411 |
142 |
240 |
173 |
24 |
0 |
0 |
| VODI |
0 |
64 |
40 |
201 |
396 |
252 |
14 |
0 |
| ODI |
0 |
4 |
8 |
48 |
234 |
423 |
117 |
0 |
| CDI |
0 |
0 |
3 |
18 |
126 |
789 |
649 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
5 |
809 |
7918 |
2412 |
|
Date: 2025-09-29:
| 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 |
10965 |
5536 |
38 |
9 |
0 |
0 |
0 |
0 |
| OW |
1 |
657 |
238 |
224 |
2 |
0 |
0 |
0 |
| VODI |
0 |
12 |
37 |
400 |
270 |
0 |
0 |
0 |
| ODI |
0 |
0 |
0 |
37 |
487 |
87 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
205 |
1349 |
64 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
10 |
1368 |
9706 |
380 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
10965 |
5202 |
50 |
32 |
3 |
0 |
0 |
0 |
| OW |
1 |
736 |
114 |
194 |
87 |
11 |
0 |
0 |
| VODI |
0 |
224 |
107 |
247 |
313 |
191 |
36 |
0 |
| ODI |
0 |
43 |
40 |
126 |
212 |
278 |
105 |
0 |
| CDI |
0 |
0 |
2 |
71 |
327 |
756 |
424 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
32 |
1568 |
9205 |
380 |
|
Date: 2025-10-01:
| 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 |
11231 |
5611 |
87 |
16 |
0 |
0 |
0 |
0 |
| OW |
1 |
490 |
198 |
227 |
14 |
0 |
0 |
0 |
| VODI |
0 |
41 |
89 |
326 |
244 |
20 |
0 |
0 |
| ODI |
0 |
0 |
4 |
113 |
288 |
129 |
3 |
0 |
| CDI |
0 |
0 |
0 |
11 |
324 |
847 |
164 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
32 |
2268 |
8400 |
904 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
11231 |
4845 |
104 |
48 |
4 |
0 |
0 |
0 |
| OW |
1 |
810 |
123 |
202 |
94 |
27 |
0 |
0 |
| VODI |
0 |
332 |
83 |
219 |
265 |
172 |
30 |
0 |
| ODI |
0 |
104 |
35 |
103 |
191 |
372 |
68 |
0 |
| CDI |
0 |
49 |
24 |
93 |
198 |
872 |
428 |
0 |
| VCDI |
0 |
2 |
9 |
28 |
150 |
1821 |
8041 |
904 |
|
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 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
10037 |
5949 |
114 |
125 |
53 |
27 |
0 |
0 |
| OW |
1 |
669 |
112 |
217 |
124 |
88 |
35 |
0 |
| VODI |
0 |
301 |
79 |
171 |
189 |
282 |
125 |
0 |
| ODI |
0 |
68 |
54 |
106 |
169 |
366 |
166 |
0 |
| CDI |
0 |
14 |
24 |
132 |
180 |
670 |
546 |
0 |
| VCDI |
0 |
0 |
0 |
28 |
76 |
1084 |
6610 |
3091 |
|
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