Validation of sea ice concentration - Full domain
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 |
117089 |
14337 |
193 |
110 |
2 |
0 |
0 |
0 |
| OW |
2327 |
3115 |
755 |
831 |
99 |
11 |
0 |
0 |
| VODI |
1517 |
348 |
375 |
2052 |
1445 |
220 |
0 |
0 |
| ODI |
0 |
53 |
31 |
328 |
1422 |
2336 |
128 |
0 |
| CDI |
0 |
22 |
30 |
163 |
1069 |
8606 |
3193 |
0 |
| VCDI |
0 |
0 |
0 |
2 |
82 |
6092 |
10608 |
1819 |
|
...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 |
117869 |
13096 |
200 |
121 |
12 |
0 |
0 |
0 |
| OW |
2258 |
3165 |
584 |
820 |
212 |
17 |
0 |
0 |
| VODI |
1569 |
398 |
308 |
1553 |
1643 |
398 |
0 |
0 |
| ODI |
0 |
78 |
39 |
343 |
1351 |
2295 |
144 |
0 |
| CDI |
0 |
36 |
22 |
149 |
755 |
5367 |
3008 |
0 |
| VCDI |
0 |
0 |
0 |
9 |
29 |
4684 |
15683 |
2595 |
|
...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 |
117637 |
14111 |
163 |
84 |
6 |
0 |
0 |
0 |
| OW |
2242 |
2127 |
614 |
810 |
194 |
4 |
0 |
0 |
| VODI |
1668 |
293 |
190 |
1275 |
1407 |
264 |
2 |
0 |
| ODI |
0 |
45 |
32 |
352 |
1269 |
1568 |
279 |
0 |
| CDI |
0 |
35 |
20 |
101 |
906 |
4041 |
2272 |
0 |
| VCDI |
0 |
0 |
3 |
11 |
45 |
2682 |
18835 |
5223 |
|
...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 |
116762 |
14053 |
169 |
89 |
14 |
0 |
0 |
0 |
| OW |
2123 |
2370 |
550 |
896 |
263 |
9 |
0 |
0 |
| VODI |
1853 |
267 |
230 |
961 |
1409 |
362 |
16 |
0 |
| ODI |
0 |
25 |
32 |
291 |
1112 |
1518 |
157 |
0 |
| CDI |
0 |
10 |
13 |
148 |
866 |
3845 |
1873 |
0 |
| VCDI |
0 |
0 |
0 |
4 |
64 |
2698 |
20021 |
5737 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
116774 |
14295 |
252 |
187 |
28 |
0 |
0 |
0 |
| OW |
2112 |
2095 |
420 |
725 |
312 |
14 |
0 |
0 |
| VODI |
1852 |
301 |
275 |
1005 |
1341 |
358 |
19 |
0 |
| ODI |
0 |
24 |
33 |
315 |
1153 |
1557 |
183 |
0 |
| CDI |
0 |
10 |
14 |
147 |
822 |
3878 |
1991 |
0 |
| VCDI |
0 |
0 |
0 |
10 |
72 |
2625 |
19874 |
5737 |
|
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 |
115787 |
13917 |
137 |
99 |
0 |
0 |
0 |
0 |
| OW |
2070 |
2935 |
534 |
673 |
286 |
36 |
0 |
0 |
| VODI |
1794 |
340 |
228 |
736 |
1068 |
650 |
131 |
0 |
| ODI |
0 |
33 |
56 |
319 |
682 |
1176 |
489 |
0 |
| CDI |
0 |
3 |
8 |
90 |
699 |
2635 |
2926 |
0 |
| VCDI |
0 |
0 |
0 |
1 |
42 |
2933 |
19618 |
7679 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
115787 |
14341 |
191 |
172 |
20 |
3 |
0 |
0 |
| OW |
2077 |
2473 |
452 |
561 |
311 |
75 |
16 |
0 |
| VODI |
1787 |
378 |
262 |
775 |
987 |
665 |
139 |
0 |
| ODI |
0 |
30 |
47 |
312 |
732 |
1174 |
561 |
0 |
| CDI |
0 |
6 |
11 |
97 |
694 |
2641 |
2885 |
0 |
| VCDI |
0 |
0 |
0 |
1 |
33 |
2872 |
19563 |
7679 |
|
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 |
114530 |
14757 |
203 |
107 |
18 |
0 |
0 |
0 |
| OW |
1966 |
1976 |
741 |
755 |
104 |
0 |
0 |
0 |
| VODI |
1910 |
54 |
153 |
1579 |
615 |
12 |
0 |
0 |
| ODI |
0 |
0 |
0 |
288 |
1415 |
237 |
4 |
0 |
| CDI |
0 |
0 |
0 |
6 |
885 |
3774 |
209 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
18 |
3603 |
26528 |
4363 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
114532 |
13607 |
261 |
292 |
45 |
8 |
0 |
0 |
| OW |
2015 |
2381 |
445 |
875 |
433 |
93 |
28 |
0 |
| VODI |
1859 |
719 |
311 |
1012 |
912 |
650 |
152 |
0 |
| ODI |
0 |
77 |
71 |
390 |
736 |
804 |
504 |
0 |
| CDI |
0 |
3 |
9 |
161 |
847 |
2542 |
1750 |
0 |
| VCDI |
0 |
0 |
0 |
5 |
82 |
3529 |
24307 |
4363 |
|
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 |
114387 |
14103 |
260 |
137 |
1 |
0 |
0 |
0 |
| OW |
1943 |
1951 |
708 |
916 |
127 |
1 |
0 |
0 |
| VODI |
1948 |
170 |
229 |
1106 |
861 |
74 |
0 |
0 |
| ODI |
0 |
6 |
24 |
369 |
1036 |
486 |
7 |
0 |
| CDI |
0 |
3 |
7 |
48 |
875 |
2601 |
288 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
170 |
5324 |
20924 |
9720 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
114401 |
12893 |
318 |
283 |
33 |
18 |
2 |
0 |
| OW |
1974 |
2405 |
510 |
836 |
568 |
145 |
16 |
0 |
| VODI |
1903 |
752 |
274 |
872 |
1069 |
778 |
114 |
0 |
| ODI |
0 |
129 |
73 |
295 |
561 |
1205 |
443 |
0 |
| CDI |
0 |
52 |
44 |
256 |
498 |
2006 |
1747 |
0 |
| VCDI |
0 |
2 |
9 |
34 |
341 |
4334 |
18897 |
9720 |
|
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 |
112575 |
14297 |
342 |
322 |
18 |
2 |
0 |
0 |
| OW |
1905 |
1966 |
613 |
1022 |
337 |
32 |
0 |
0 |
| VODI |
1991 |
393 |
253 |
1089 |
1001 |
230 |
1 |
0 |
| ODI |
0 |
54 |
32 |
230 |
774 |
688 |
49 |
0 |
| CDI |
0 |
13 |
28 |
91 |
426 |
2521 |
632 |
0 |
| VCDI |
0 |
0 |
0 |
8 |
216 |
5952 |
19504 |
11203 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
112581 |
13608 |
460 |
597 |
376 |
136 |
47 |
0 |
| OW |
1947 |
2063 |
372 |
737 |
486 |
436 |
148 |
0 |
| VODI |
1943 |
827 |
264 |
602 |
510 |
601 |
489 |
0 |
| ODI |
0 |
197 |
117 |
502 |
619 |
916 |
746 |
0 |
| CDI |
0 |
28 |
52 |
241 |
448 |
1483 |
1616 |
12 |
| VCDI |
0 |
0 |
3 |
83 |
333 |
5853 |
17140 |
11191 |
|
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