Validation of sea ice concentration - American sector
Bulletin date: 2025-10-09
Data source: OSI SAF N.H. AMSR sea ice concentration
Model vs. observations, sea ice class contingency tables
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 |
14609 |
4946 |
247 |
291 |
17 |
2 |
0 |
0 |
| OW |
0 |
1156 |
339 |
643 |
291 |
32 |
0 |
0 |
| VODI |
0 |
263 |
140 |
648 |
574 |
194 |
1 |
0 |
| ODI |
0 |
23 |
9 |
114 |
459 |
401 |
36 |
0 |
| CDI |
0 |
4 |
2 |
4 |
160 |
1362 |
360 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
37 |
1489 |
9197 |
7816 |
|
...date precedes bulletin
|
Date: 2025-10-05:
| 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 |
14332 |
4329 |
168 |
279 |
59 |
0 |
0 |
0 |
| OW |
0 |
469 |
207 |
608 |
389 |
7 |
0 |
0 |
| VODI |
0 |
27 |
70 |
559 |
1214 |
351 |
15 |
0 |
| ODI |
0 |
5 |
2 |
110 |
655 |
507 |
104 |
0 |
| CDI |
0 |
1 |
3 |
6 |
200 |
965 |
368 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
13 |
4132 |
15217 |
495 |
|
...date precedes bulletin
|
Date: 2025-10-07:
| 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 |
13707 |
5502 |
177 |
124 |
3 |
0 |
0 |
0 |
| OW |
0 |
278 |
214 |
433 |
104 |
0 |
0 |
0 |
| VODI |
0 |
28 |
41 |
598 |
646 |
7 |
0 |
0 |
| ODI |
0 |
3 |
3 |
97 |
539 |
352 |
0 |
0 |
| CDI |
0 |
0 |
0 |
4 |
236 |
1453 |
236 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
2 |
1957 |
13708 |
5414 |
|
...date precedes bulletin
|
Date: 2025-10-09:
| 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 |
14524 |
4695 |
100 |
98 |
9 |
1 |
0 |
0 |
| OW |
0 |
341 |
190 |
359 |
163 |
13 |
0 |
0 |
| VODI |
0 |
29 |
62 |
372 |
526 |
132 |
0 |
0 |
| ODI |
0 |
3 |
3 |
100 |
544 |
357 |
23 |
0 |
| CDI |
0 |
0 |
1 |
8 |
160 |
820 |
276 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
42 |
4330 |
14658 |
2927 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
14524 |
4653 |
113 |
115 |
6 |
1 |
0 |
0 |
| OW |
0 |
374 |
165 |
322 |
194 |
21 |
0 |
0 |
| VODI |
0 |
38 |
74 |
375 |
505 |
143 |
0 |
0 |
| ODI |
0 |
3 |
4 |
120 |
540 |
449 |
22 |
0 |
| CDI |
0 |
0 |
0 |
5 |
160 |
1040 |
405 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
39 |
3999 |
14530 |
2927 |
|
Date: 2025-10-11:
| 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 |
13814 |
4532 |
112 |
150 |
27 |
0 |
0 |
0 |
| OW |
0 |
466 |
190 |
273 |
148 |
25 |
0 |
0 |
| VODI |
0 |
39 |
91 |
363 |
507 |
186 |
4 |
0 |
| ODI |
0 |
1 |
8 |
90 |
307 |
528 |
57 |
0 |
| CDI |
0 |
0 |
0 |
15 |
130 |
879 |
209 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
39 |
4232 |
17158 |
1286 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
13814 |
4517 |
100 |
140 |
62 |
6 |
0 |
0 |
| OW |
0 |
454 |
190 |
278 |
134 |
21 |
0 |
0 |
| VODI |
0 |
66 |
101 |
366 |
431 |
176 |
2 |
0 |
| ODI |
0 |
1 |
10 |
98 |
399 |
540 |
33 |
0 |
| CDI |
0 |
0 |
0 |
9 |
106 |
1048 |
228 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
26 |
4059 |
17165 |
1286 |
|
Date: 2025-10-13:
| 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 |
13556 |
4520 |
62 |
45 |
17 |
0 |
0 |
0 |
| OW |
0 |
411 |
247 |
216 |
31 |
0 |
0 |
0 |
| VODI |
0 |
8 |
36 |
434 |
256 |
2 |
0 |
0 |
| ODI |
0 |
0 |
3 |
63 |
455 |
122 |
4 |
0 |
| CDI |
0 |
0 |
1 |
4 |
194 |
1148 |
196 |
0 |
| VCDI |
0 |
0 |
0 |
1 |
24 |
2168 |
15979 |
5663 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
13556 |
4292 |
93 |
102 |
30 |
0 |
0 |
0 |
| OW |
0 |
541 |
140 |
254 |
232 |
34 |
1 |
0 |
| VODI |
0 |
102 |
105 |
295 |
375 |
203 |
22 |
0 |
| ODI |
0 |
3 |
9 |
97 |
258 |
534 |
140 |
0 |
| CDI |
0 |
1 |
2 |
14 |
61 |
769 |
772 |
0 |
| VCDI |
0 |
0 |
0 |
1 |
21 |
1900 |
15244 |
5663 |
|
Date: 2025-10-15:
| 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 |
13449 |
4253 |
109 |
109 |
0 |
0 |
0 |
0 |
| OW |
1 |
497 |
162 |
316 |
39 |
0 |
0 |
0 |
| VODI |
0 |
107 |
79 |
338 |
239 |
25 |
1 |
0 |
| ODI |
0 |
12 |
26 |
166 |
305 |
176 |
24 |
0 |
| CDI |
0 |
0 |
5 |
87 |
368 |
776 |
193 |
0 |
| VCDI |
0 |
1 |
6 |
18 |
83 |
1652 |
16378 |
5866 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
13442 |
4039 |
102 |
80 |
8 |
0 |
0 |
0 |
| OW |
8 |
632 |
148 |
336 |
133 |
32 |
7 |
0 |
| VODI |
0 |
192 |
115 |
373 |
307 |
154 |
34 |
0 |
| ODI |
0 |
6 |
9 |
190 |
374 |
440 |
88 |
0 |
| CDI |
0 |
1 |
13 |
55 |
164 |
903 |
1122 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
48 |
1100 |
15345 |
5866 |
|
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 |
13065 |
4275 |
127 |
101 |
23 |
0 |
0 |
0 |
| OW |
6 |
562 |
151 |
303 |
118 |
14 |
0 |
0 |
| VODI |
0 |
50 |
102 |
347 |
286 |
97 |
0 |
0 |
| ODI |
0 |
6 |
19 |
118 |
306 |
242 |
24 |
0 |
| CDI |
0 |
0 |
2 |
40 |
223 |
689 |
327 |
0 |
| VCDI |
0 |
0 |
4 |
12 |
28 |
1909 |
15109 |
7181 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
13067 |
4084 |
141 |
131 |
75 |
47 |
0 |
0 |
| OW |
4 |
678 |
175 |
346 |
177 |
60 |
8 |
0 |
| VODI |
0 |
129 |
76 |
335 |
358 |
247 |
106 |
0 |
| ODI |
0 |
1 |
6 |
85 |
252 |
451 |
262 |
0 |
| CDI |
0 |
1 |
7 |
20 |
103 |
586 |
1316 |
13 |
| VCDI |
0 |
0 |
0 |
4 |
19 |
1560 |
13768 |
7168 |
|
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