Validation of sea ice concentration - Full domain
Bulletin date: 2025-10-23
Data source: OSI SAF N.H. AMSR sea ice concentration
Model vs. observations, sea ice class contingency tables
Date: 2025-10-17:
| 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 |
106521 |
14147 |
381 |
338 |
120 |
13 |
0 |
0 |
| OW |
1660 |
1823 |
449 |
976 |
367 |
54 |
0 |
0 |
| VODI |
2360 |
254 |
254 |
871 |
1128 |
368 |
0 |
0 |
| ODI |
0 |
73 |
44 |
245 |
800 |
760 |
93 |
0 |
| CDI |
0 |
42 |
41 |
257 |
715 |
2324 |
1169 |
0 |
| VCDI |
0 |
0 |
4 |
13 |
170 |
9709 |
24766 |
7501 |
|
...date precedes bulletin
|
Date: 2025-10-19:
| 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 |
106116 |
13031 |
433 |
638 |
181 |
18 |
0 |
0 |
| OW |
1655 |
1932 |
411 |
839 |
537 |
123 |
0 |
0 |
| VODI |
2396 |
387 |
243 |
840 |
1051 |
562 |
27 |
0 |
| ODI |
0 |
78 |
47 |
234 |
836 |
933 |
122 |
0 |
| CDI |
0 |
31 |
45 |
280 |
564 |
2102 |
809 |
0 |
| VCDI |
0 |
0 |
0 |
18 |
231 |
10828 |
22372 |
9860 |
|
...date precedes bulletin
|
Date: 2025-10-21:
| 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 |
104180 |
13690 |
605 |
663 |
269 |
22 |
0 |
0 |
| OW |
1580 |
982 |
556 |
1073 |
455 |
75 |
0 |
0 |
| VODI |
2448 |
69 |
144 |
1222 |
956 |
304 |
6 |
0 |
| ODI |
0 |
1 |
0 |
376 |
997 |
544 |
75 |
0 |
| CDI |
0 |
0 |
0 |
70 |
1204 |
3031 |
858 |
0 |
| VCDI |
0 |
0 |
0 |
4 |
122 |
10211 |
22249 |
11769 |
|
...date precedes bulletin
|
Date: 2025-10-23:
| 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 |
103961 |
11354 |
677 |
982 |
211 |
38 |
0 |
0 |
| OW |
1481 |
738 |
368 |
1171 |
798 |
253 |
0 |
0 |
| VODI |
2625 |
196 |
104 |
971 |
1181 |
550 |
17 |
0 |
| ODI |
0 |
51 |
50 |
279 |
1083 |
800 |
108 |
0 |
| CDI |
0 |
12 |
21 |
91 |
966 |
2104 |
896 |
0 |
| VCDI |
0 |
0 |
0 |
10 |
200 |
9086 |
26495 |
10882 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
103973 |
11425 |
724 |
1106 |
382 |
93 |
0 |
0 |
| OW |
1474 |
636 |
319 |
1072 |
620 |
257 |
0 |
0 |
| VODI |
2620 |
212 |
106 |
984 |
1218 |
559 |
36 |
0 |
| ODI |
0 |
60 |
40 |
229 |
1021 |
772 |
118 |
0 |
| CDI |
0 |
18 |
31 |
81 |
984 |
2159 |
957 |
0 |
| VCDI |
0 |
0 |
0 |
32 |
214 |
8991 |
26405 |
10882 |
|
Date: 2025-10-25:
| 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 |
102693 |
10985 |
630 |
934 |
175 |
5 |
0 |
0 |
| OW |
1438 |
539 |
356 |
1028 |
682 |
98 |
6 |
0 |
| VODI |
2676 |
155 |
117 |
751 |
1451 |
734 |
35 |
0 |
| ODI |
0 |
15 |
33 |
209 |
1326 |
940 |
133 |
0 |
| CDI |
0 |
1 |
4 |
98 |
892 |
2260 |
731 |
0 |
| VCDI |
0 |
0 |
4 |
27 |
335 |
10524 |
28452 |
9338 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
102704 |
10975 |
640 |
954 |
233 |
31 |
3 |
0 |
| OW |
1432 |
552 |
342 |
1013 |
644 |
154 |
16 |
0 |
| VODI |
2671 |
138 |
116 |
744 |
1456 |
722 |
44 |
0 |
| ODI |
0 |
29 |
37 |
193 |
1331 |
887 |
144 |
0 |
| CDI |
0 |
1 |
5 |
120 |
826 |
2298 |
762 |
0 |
| VCDI |
0 |
0 |
4 |
23 |
371 |
10469 |
28388 |
9338 |
|
Date: 2025-10-27:
| 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 |
102283 |
10344 |
472 |
554 |
127 |
1 |
0 |
0 |
| OW |
1416 |
432 |
496 |
1020 |
343 |
15 |
0 |
0 |
| VODI |
2716 |
23 |
75 |
1112 |
1539 |
175 |
5 |
0 |
| ODI |
0 |
0 |
5 |
84 |
1619 |
2241 |
274 |
0 |
| CDI |
0 |
0 |
1 |
9 |
563 |
2872 |
753 |
0 |
| VCDI |
0 |
1 |
1 |
1 |
57 |
7155 |
32930 |
9096 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
102213 |
10154 |
540 |
824 |
359 |
20 |
6 |
0 |
| OW |
1347 |
460 |
312 |
917 |
661 |
87 |
16 |
0 |
| VODI |
2855 |
160 |
145 |
668 |
1327 |
489 |
28 |
0 |
| ODI |
0 |
25 |
45 |
284 |
1045 |
1078 |
42 |
0 |
| CDI |
0 |
0 |
6 |
76 |
670 |
2469 |
585 |
0 |
| VCDI |
0 |
1 |
2 |
11 |
186 |
8316 |
33285 |
9096 |
|
Date: 2025-10-29:
| 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 |
102142 |
9354 |
347 |
388 |
139 |
12 |
0 |
0 |
| OW |
1397 |
420 |
246 |
568 |
302 |
65 |
1 |
0 |
| VODI |
2782 |
160 |
156 |
824 |
1110 |
648 |
16 |
0 |
| ODI |
0 |
5 |
23 |
136 |
1318 |
1309 |
199 |
0 |
| CDI |
0 |
0 |
1 |
39 |
434 |
2421 |
957 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
153 |
7205 |
33619 |
11914 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
102184 |
9223 |
397 |
602 |
372 |
94 |
6 |
0 |
| OW |
1371 |
490 |
190 |
611 |
585 |
264 |
14 |
0 |
| VODI |
2766 |
182 |
121 |
390 |
1160 |
926 |
109 |
0 |
| ODI |
0 |
38 |
54 |
254 |
560 |
1204 |
287 |
0 |
| CDI |
0 |
6 |
11 |
94 |
550 |
2242 |
1271 |
0 |
| VCDI |
0 |
0 |
0 |
4 |
229 |
6930 |
33105 |
11914 |
|
Date: 2025-10-31:
| 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 |
99341 |
11183 |
358 |
426 |
103 |
7 |
0 |
0 |
| OW |
1359 |
845 |
295 |
548 |
145 |
33 |
1 |
0 |
| VODI |
2825 |
207 |
246 |
679 |
564 |
325 |
109 |
0 |
| ODI |
0 |
33 |
46 |
279 |
631 |
1315 |
385 |
0 |
| CDI |
0 |
5 |
13 |
86 |
541 |
1837 |
910 |
11 |
| VCDI |
0 |
0 |
0 |
0 |
82 |
5891 |
30386 |
18760 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
99391 |
11118 |
458 |
583 |
88 |
10 |
30 |
0 |
| OW |
1331 |
720 |
204 |
507 |
367 |
259 |
87 |
0 |
| VODI |
2803 |
306 |
191 |
456 |
537 |
915 |
285 |
0 |
| ODI |
0 |
74 |
55 |
225 |
427 |
1078 |
414 |
9 |
| CDI |
0 |
55 |
48 |
177 |
487 |
1746 |
1248 |
17 |
| VCDI |
0 |
0 |
2 |
70 |
160 |
5400 |
29727 |
18745 |
|
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