Validation of sea ice concentration - Asian sector
Bulletin date: 2025-09-11
Data source: OSI SAF N.H. multi-product 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 |
12442 |
4444 |
22 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
1308 |
397 |
394 |
1 |
0 |
0 |
0 |
| VODI |
0 |
59 |
81 |
2242 |
474 |
0 |
0 |
0 |
| ODI |
0 |
0 |
0 |
59 |
6117 |
815 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
899 |
3342 |
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 |
12383 |
4197 |
6 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
1469 |
331 |
308 |
2 |
0 |
0 |
0 |
| VODI |
0 |
96 |
154 |
2249 |
501 |
3 |
0 |
0 |
| ODI |
0 |
0 |
0 |
160 |
5224 |
943 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
1008 |
4062 |
0 |
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 |
12411 |
4684 |
19 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
981 |
445 |
553 |
0 |
0 |
0 |
0 |
| VODI |
0 |
1 |
25 |
1934 |
466 |
0 |
0 |
0 |
| ODI |
0 |
0 |
0 |
147 |
3655 |
13 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
2061 |
5533 |
0 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
168 |
0 |
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 |
12323 |
4714 |
22 |
4 |
0 |
0 |
0 |
0 |
| OW |
0 |
1008 |
367 |
552 |
8 |
0 |
0 |
0 |
| VODI |
0 |
11 |
61 |
1829 |
607 |
12 |
0 |
0 |
| ODI |
0 |
0 |
0 |
80 |
2000 |
238 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
996 |
8176 |
36 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
1 |
51 |
0 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
12323 |
4953 |
46 |
12 |
0 |
0 |
0 |
0 |
| OW |
0 |
765 |
348 |
615 |
26 |
0 |
0 |
0 |
| VODI |
0 |
15 |
56 |
1694 |
612 |
10 |
0 |
0 |
| ODI |
0 |
0 |
0 |
144 |
1916 |
330 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
1058 |
7994 |
36 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
143 |
0 |
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 |
12209 |
4651 |
9 |
1 |
0 |
0 |
0 |
0 |
| OW |
0 |
1094 |
321 |
571 |
49 |
0 |
0 |
0 |
| VODI |
0 |
29 |
115 |
1667 |
791 |
22 |
0 |
0 |
| ODI |
0 |
0 |
0 |
87 |
1498 |
390 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
616 |
6731 |
42 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
2 |
1916 |
285 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
12209 |
4849 |
50 |
19 |
0 |
0 |
0 |
0 |
| OW |
0 |
893 |
302 |
592 |
56 |
0 |
0 |
0 |
| VODI |
0 |
32 |
93 |
1559 |
761 |
19 |
0 |
0 |
| ODI |
0 |
0 |
0 |
156 |
1549 |
483 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
589 |
6545 |
36 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
1 |
2012 |
291 |
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 |
12096 |
5297 |
45 |
8 |
0 |
0 |
0 |
0 |
| OW |
0 |
577 |
371 |
753 |
5 |
0 |
0 |
0 |
| VODI |
0 |
0 |
3 |
1320 |
379 |
0 |
0 |
0 |
| ODI |
0 |
0 |
0 |
45 |
1245 |
17 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
819 |
7243 |
0 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
8 |
2357 |
508 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
12096 |
4960 |
77 |
37 |
0 |
0 |
0 |
0 |
| OW |
0 |
837 |
271 |
762 |
165 |
0 |
0 |
0 |
| VODI |
0 |
77 |
71 |
1196 |
843 |
120 |
0 |
0 |
| ODI |
0 |
0 |
0 |
131 |
1079 |
649 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
369 |
6292 |
28 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
2556 |
480 |
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 |
12301 |
5200 |
55 |
15 |
0 |
0 |
0 |
0 |
| OW |
0 |
759 |
327 |
587 |
24 |
0 |
0 |
0 |
| VODI |
0 |
13 |
39 |
1264 |
401 |
6 |
0 |
0 |
| ODI |
0 |
1 |
9 |
117 |
1032 |
118 |
0 |
0 |
| CDI |
0 |
0 |
0 |
23 |
427 |
6332 |
30 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
54 |
2813 |
1149 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
12301 |
4915 |
40 |
30 |
0 |
0 |
0 |
0 |
| OW |
0 |
939 |
281 |
731 |
149 |
0 |
0 |
0 |
| VODI |
0 |
119 |
100 |
1049 |
801 |
111 |
0 |
0 |
| ODI |
0 |
0 |
9 |
196 |
923 |
659 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
65 |
5869 |
85 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
2630 |
1094 |
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 |
12690 |
5041 |
52 |
9 |
0 |
0 |
0 |
0 |
| OW |
0 |
798 |
280 |
498 |
45 |
0 |
0 |
0 |
| VODI |
0 |
64 |
75 |
949 |
611 |
18 |
0 |
0 |
| ODI |
0 |
15 |
9 |
126 |
799 |
259 |
0 |
0 |
| CDI |
0 |
2 |
3 |
65 |
434 |
6131 |
319 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
18 |
3640 |
146 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
12690 |
4558 |
58 |
31 |
0 |
0 |
0 |
0 |
| OW |
0 |
1218 |
246 |
597 |
102 |
0 |
0 |
0 |
| VODI |
0 |
144 |
112 |
904 |
861 |
181 |
0 |
0 |
| ODI |
0 |
0 |
3 |
115 |
803 |
789 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
141 |
4759 |
219 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
4319 |
246 |
0 |
|
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