Validation of sea ice concentration - Full domain
Bulletin date: 2025-10-02
Data source: OSI SAF N.H. AMSR sea ice concentration
Model vs. observations, sea ice class contingency tables
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 |
116418 |
13761 |
180 |
98 |
9 |
0 |
0 |
0 |
| OW |
2186 |
2560 |
480 |
798 |
324 |
59 |
0 |
0 |
| VODI |
1886 |
342 |
223 |
733 |
1137 |
760 |
32 |
0 |
| ODI |
0 |
34 |
30 |
298 |
692 |
1428 |
416 |
0 |
| CDI |
0 |
4 |
11 |
144 |
831 |
3151 |
2495 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
42 |
2401 |
18603 |
8244 |
|
...date precedes bulletin
|
Date: 2025-09-28:
| 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 |
115228 |
13698 |
167 |
117 |
2 |
0 |
0 |
0 |
| OW |
2038 |
2874 |
608 |
860 |
240 |
26 |
0 |
0 |
| VODI |
1834 |
385 |
271 |
914 |
971 |
567 |
89 |
0 |
| ODI |
0 |
42 |
52 |
336 |
820 |
964 |
350 |
0 |
| CDI |
0 |
3 |
5 |
121 |
866 |
2360 |
2124 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
33 |
3264 |
22265 |
6316 |
|
...date precedes bulletin
|
Date: 2025-09-30:
| 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 |
113234 |
15827 |
201 |
102 |
1 |
0 |
0 |
0 |
| OW |
1952 |
1970 |
735 |
756 |
99 |
0 |
0 |
0 |
| VODI |
1935 |
138 |
226 |
1186 |
776 |
21 |
0 |
0 |
| ODI |
0 |
4 |
14 |
327 |
1295 |
293 |
4 |
0 |
| CDI |
0 |
1 |
2 |
44 |
964 |
2834 |
262 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
95 |
5059 |
25387 |
5066 |
|
...date precedes bulletin
|
Date: 2025-10-02:
| 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 |
112624 |
15135 |
308 |
298 |
11 |
0 |
0 |
0 |
| OW |
1922 |
1962 |
582 |
1103 |
253 |
3 |
0 |
0 |
| VODI |
1970 |
212 |
193 |
1068 |
963 |
142 |
0 |
0 |
| ODI |
0 |
14 |
31 |
242 |
974 |
575 |
32 |
0 |
| CDI |
0 |
2 |
10 |
59 |
584 |
2752 |
342 |
0 |
| VCDI |
0 |
0 |
0 |
2 |
200 |
4563 |
20979 |
10700 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
112623 |
15535 |
411 |
431 |
60 |
0 |
0 |
0 |
| OW |
1928 |
1531 |
495 |
1094 |
264 |
5 |
0 |
0 |
| VODI |
1965 |
247 |
180 |
944 |
966 |
177 |
0 |
0 |
| ODI |
0 |
11 |
31 |
241 |
939 |
640 |
32 |
0 |
| CDI |
0 |
1 |
7 |
62 |
572 |
2609 |
340 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
184 |
4604 |
20981 |
10700 |
|
Date: 2025-10-04:
| 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 |
111218 |
14381 |
388 |
467 |
85 |
0 |
0 |
0 |
| OW |
1882 |
1742 |
504 |
1107 |
377 |
28 |
0 |
0 |
| VODI |
2023 |
437 |
262 |
1312 |
1061 |
429 |
14 |
0 |
| ODI |
0 |
49 |
39 |
291 |
674 |
858 |
98 |
0 |
| CDI |
0 |
18 |
18 |
112 |
432 |
1951 |
1032 |
0 |
| VCDI |
0 |
0 |
0 |
3 |
93 |
7387 |
25922 |
4116 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
111221 |
14616 |
479 |
713 |
176 |
7 |
0 |
0 |
| OW |
1894 |
1487 |
422 |
1118 |
426 |
85 |
0 |
0 |
| VODI |
2008 |
463 |
255 |
1070 |
1024 |
450 |
13 |
0 |
| ODI |
0 |
42 |
35 |
268 |
600 |
827 |
113 |
0 |
| CDI |
0 |
19 |
20 |
116 |
384 |
2001 |
1082 |
0 |
| VCDI |
0 |
0 |
0 |
7 |
112 |
7283 |
25858 |
4116 |
|
Date: 2025-10-06:
| 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 |
111228 |
14087 |
411 |
308 |
13 |
0 |
0 |
0 |
| OW |
1770 |
1465 |
613 |
793 |
38 |
0 |
0 |
0 |
| VODI |
2208 |
33 |
159 |
1583 |
658 |
5 |
0 |
0 |
| ODI |
0 |
6 |
7 |
223 |
1521 |
298 |
44 |
0 |
| CDI |
0 |
0 |
1 |
22 |
743 |
3773 |
373 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
34 |
7907 |
26005 |
4481 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
111224 |
13639 |
493 |
585 |
51 |
0 |
0 |
0 |
| OW |
1797 |
1419 |
386 |
842 |
450 |
70 |
0 |
0 |
| VODI |
2185 |
436 |
218 |
1038 |
1035 |
479 |
8 |
0 |
| ODI |
0 |
76 |
61 |
322 |
788 |
1020 |
147 |
0 |
| CDI |
0 |
21 |
33 |
141 |
589 |
1739 |
828 |
22 |
| VCDI |
0 |
0 |
0 |
1 |
94 |
8675 |
25439 |
4459 |
|
Date: 2025-10-08:
| 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 |
112155 |
13519 |
216 |
124 |
5 |
0 |
0 |
0 |
| OW |
1812 |
1575 |
353 |
658 |
149 |
3 |
0 |
0 |
| VODI |
2111 |
348 |
229 |
850 |
863 |
60 |
0 |
0 |
| ODI |
0 |
73 |
82 |
300 |
1070 |
429 |
9 |
0 |
| CDI |
0 |
21 |
47 |
202 |
945 |
2484 |
438 |
0 |
| VCDI |
0 |
0 |
0 |
6 |
260 |
10597 |
21789 |
7028 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
112141 |
12730 |
314 |
458 |
149 |
0 |
0 |
0 |
| OW |
1848 |
1617 |
212 |
537 |
354 |
111 |
0 |
0 |
| VODI |
2089 |
804 |
190 |
611 |
907 |
664 |
78 |
0 |
| ODI |
0 |
246 |
100 |
237 |
706 |
844 |
218 |
0 |
| CDI |
0 |
133 |
103 |
275 |
756 |
1602 |
917 |
0 |
| VCDI |
0 |
6 |
8 |
22 |
420 |
10352 |
21023 |
7028 |
|
Date: 2025-10-10:
| 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 |
111670 |
13101 |
211 |
213 |
40 |
0 |
0 |
0 |
| OW |
1764 |
1534 |
364 |
644 |
270 |
13 |
0 |
0 |
| VODI |
2258 |
423 |
191 |
722 |
860 |
260 |
2 |
0 |
| ODI |
0 |
194 |
40 |
242 |
685 |
718 |
117 |
0 |
| CDI |
0 |
193 |
102 |
255 |
813 |
2098 |
1107 |
0 |
| VCDI |
0 |
1 |
7 |
32 |
146 |
12152 |
25341 |
2027 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
111719 |
12319 |
306 |
505 |
349 |
105 |
0 |
0 |
| OW |
1863 |
1529 |
195 |
446 |
414 |
265 |
16 |
0 |
| VODI |
2110 |
985 |
186 |
500 |
645 |
852 |
326 |
0 |
| ODI |
0 |
340 |
98 |
261 |
389 |
776 |
390 |
0 |
| CDI |
0 |
200 |
113 |
334 |
700 |
1601 |
1271 |
0 |
| VCDI |
0 |
73 |
17 |
62 |
317 |
11642 |
24564 |
2027 |
|
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