Validation of sea ice concentration - Asian sector
Bulletin date: 2025-09-11
Data source: OSI SAF N.H. AMSR sea ice concentration
Model vs. observations, sea ice class contingency tables
Date: 2025-09-05:
| 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 |
11536 |
4347 |
19 |
1 |
0 |
0 |
0 |
0 |
| OW |
0 |
1638 |
287 |
157 |
9 |
0 |
0 |
0 |
| VODI |
0 |
198 |
331 |
1742 |
577 |
8 |
0 |
0 |
| ODI |
0 |
0 |
0 |
478 |
4879 |
1634 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
769 |
3472 |
0 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
...date precedes bulletin
|
Date: 2025-09-07:
| 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 |
11539 |
4042 |
6 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
1680 |
234 |
171 |
10 |
0 |
0 |
0 |
| VODI |
0 |
263 |
343 |
1734 |
634 |
29 |
0 |
0 |
| ODI |
0 |
0 |
1 |
514 |
4027 |
1785 |
0 |
0 |
| CDI |
0 |
0 |
0 |
3 |
942 |
4115 |
10 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
...date precedes bulletin
|
Date: 2025-09-09:
| 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 |
11578 |
4537 |
0 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
1313 |
407 |
223 |
21 |
0 |
0 |
0 |
| VODI |
0 |
25 |
159 |
1772 |
469 |
1 |
0 |
0 |
| ODI |
0 |
0 |
0 |
354 |
2976 |
485 |
0 |
0 |
| CDI |
0 |
0 |
0 |
2 |
1484 |
6106 |
2 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
164 |
4 |
0 |
|
...date precedes bulletin
|
Date: 2025-09-11:
| 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 |
11581 |
4479 |
2 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
1325 |
282 |
290 |
28 |
0 |
0 |
0 |
| VODI |
0 |
121 |
204 |
1492 |
678 |
22 |
0 |
0 |
| ODI |
0 |
0 |
1 |
176 |
1496 |
645 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
680 |
7713 |
815 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
30 |
22 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
11581 |
4733 |
16 |
2 |
0 |
0 |
0 |
0 |
| OW |
0 |
1079 |
292 |
334 |
41 |
0 |
0 |
0 |
| VODI |
0 |
113 |
175 |
1414 |
658 |
23 |
0 |
0 |
| ODI |
0 |
0 |
6 |
208 |
1496 |
678 |
2 |
0 |
| CDI |
0 |
0 |
0 |
0 |
687 |
7623 |
778 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
86 |
57 |
0 |
|
Date: 2025-09-13:
| 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 |
11561 |
4325 |
3 |
1 |
0 |
0 |
0 |
0 |
| OW |
0 |
1417 |
212 |
296 |
81 |
3 |
0 |
0 |
| VODI |
0 |
192 |
198 |
1402 |
741 |
83 |
0 |
0 |
| ODI |
0 |
1 |
1 |
173 |
1096 |
695 |
9 |
0 |
| CDI |
0 |
0 |
0 |
2 |
716 |
5902 |
769 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
1295 |
908 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
11561 |
4563 |
13 |
6 |
0 |
0 |
0 |
0 |
| OW |
0 |
1204 |
213 |
312 |
89 |
2 |
0 |
0 |
| VODI |
0 |
166 |
179 |
1336 |
697 |
82 |
0 |
0 |
| ODI |
0 |
2 |
9 |
218 |
1161 |
786 |
9 |
0 |
| CDI |
0 |
0 |
0 |
2 |
687 |
5658 |
823 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
1450 |
854 |
0 |
|
Date: 2025-09-15:
| 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 |
11506 |
4945 |
14 |
3 |
0 |
0 |
0 |
0 |
| OW |
0 |
1030 |
376 |
265 |
11 |
0 |
0 |
0 |
| VODI |
0 |
10 |
72 |
1218 |
389 |
1 |
0 |
0 |
| ODI |
0 |
0 |
0 |
118 |
1034 |
155 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
579 |
7104 |
379 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
2 |
898 |
1973 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
11506 |
4649 |
20 |
17 |
0 |
0 |
0 |
0 |
| OW |
0 |
1140 |
267 |
428 |
161 |
22 |
0 |
0 |
| VODI |
0 |
193 |
165 |
968 |
726 |
221 |
15 |
0 |
| ODI |
0 |
3 |
10 |
191 |
779 |
830 |
46 |
0 |
| CDI |
0 |
0 |
0 |
0 |
343 |
5615 |
731 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
6 |
1470 |
1560 |
0 |
|
Date: 2025-09-17:
| 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 |
11770 |
4768 |
50 |
4 |
0 |
0 |
0 |
0 |
| OW |
0 |
1163 |
268 |
221 |
26 |
0 |
0 |
0 |
| VODI |
0 |
118 |
133 |
1100 |
339 |
17 |
0 |
0 |
| ODI |
0 |
14 |
21 |
186 |
812 |
244 |
0 |
0 |
| CDI |
0 |
0 |
3 |
33 |
380 |
5862 |
534 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
68 |
1486 |
2462 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
11770 |
4470 |
60 |
7 |
0 |
0 |
0 |
0 |
| OW |
0 |
1303 |
226 |
390 |
156 |
3 |
0 |
0 |
| VODI |
0 |
266 |
169 |
883 |
640 |
211 |
0 |
0 |
| ODI |
0 |
24 |
20 |
264 |
692 |
778 |
7 |
0 |
| CDI |
0 |
0 |
0 |
0 |
119 |
5068 |
832 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
18 |
1549 |
2157 |
0 |
|
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 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
12074 |
4218 |
29 |
36 |
0 |
0 |
0 |
0 |
| OW |
0 |
1494 |
195 |
381 |
75 |
0 |
0 |
0 |
| VODI |
0 |
346 |
163 |
816 |
599 |
252 |
11 |
0 |
| ODI |
0 |
11 |
23 |
170 |
546 |
822 |
137 |
0 |
| CDI |
0 |
0 |
0 |
0 |
165 |
3464 |
1490 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
13 |
2477 |
2075 |
0 |
|
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