Validation of sea ice concentration - Full domain
Bulletin date: 2025-04-24
Data source: OSI SAF N.H. AMSR sea ice concentration
Model vs. observations, sea ice class contingency tables
Date: 2025-04-18:
| 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 |
58426 |
14441 |
219 |
227 |
52 |
10 |
0 |
0 |
| OW |
689 |
1029 |
221 |
420 |
263 |
96 |
3 |
0 |
| VODI |
1881 |
388 |
225 |
574 |
501 |
353 |
63 |
3 |
| ODI |
1702 |
60 |
85 |
412 |
719 |
794 |
247 |
8 |
| CDI |
0 |
28 |
13 |
235 |
920 |
2447 |
2687 |
57 |
| VCDI |
0 |
4 |
13 |
96 |
621 |
3465 |
38387 |
47726 |
|
...date precedes bulletin
|
Date: 2025-04-20:
| 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 |
57961 |
14563 |
251 |
262 |
77 |
21 |
0 |
0 |
| OW |
671 |
1092 |
214 |
510 |
296 |
94 |
1 |
0 |
| VODI |
1890 |
452 |
221 |
611 |
598 |
389 |
107 |
0 |
| ODI |
1690 |
47 |
82 |
439 |
606 |
740 |
385 |
0 |
| CDI |
0 |
10 |
9 |
220 |
825 |
2022 |
2670 |
42 |
| VCDI |
0 |
0 |
0 |
93 |
527 |
3792 |
39171 |
47159 |
|
...date precedes bulletin
|
Date: 2025-04-22:
| 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 |
58783 |
14219 |
243 |
251 |
87 |
35 |
0 |
0 |
| OW |
758 |
1072 |
329 |
448 |
220 |
69 |
0 |
0 |
| VODI |
1933 |
132 |
215 |
721 |
684 |
372 |
33 |
0 |
| ODI |
1664 |
3 |
18 |
279 |
705 |
786 |
234 |
18 |
| CDI |
0 |
4 |
12 |
110 |
502 |
2487 |
3014 |
74 |
| VCDI |
0 |
0 |
0 |
22 |
309 |
2777 |
38413 |
48775 |
|
...date precedes bulletin
|
Date: 2025-04-24:
| 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 |
58402 |
14410 |
218 |
221 |
96 |
15 |
0 |
0 |
| OW |
760 |
1211 |
300 |
449 |
256 |
61 |
5 |
0 |
| VODI |
1923 |
243 |
223 |
677 |
644 |
383 |
48 |
0 |
| ODI |
1642 |
13 |
31 |
310 |
704 |
854 |
420 |
23 |
| CDI |
0 |
1 |
5 |
81 |
534 |
2520 |
4352 |
95 |
| VCDI |
0 |
0 |
0 |
19 |
553 |
2489 |
37698 |
47921 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
58402 |
14421 |
228 |
223 |
97 |
7 |
1 |
0 |
| OW |
761 |
1172 |
284 |
457 |
259 |
63 |
5 |
0 |
| VODI |
1923 |
269 |
229 |
657 |
642 |
397 |
60 |
4 |
| ODI |
1641 |
14 |
32 |
326 |
738 |
919 |
485 |
25 |
| CDI |
0 |
2 |
4 |
74 |
505 |
2522 |
4692 |
103 |
| VCDI |
0 |
0 |
0 |
20 |
546 |
2414 |
37280 |
47907 |
|
Date: 2025-04-26:
| 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 |
59041 |
13712 |
196 |
157 |
39 |
4 |
0 |
0 |
| OW |
710 |
1300 |
290 |
501 |
330 |
69 |
8 |
0 |
| VODI |
1831 |
376 |
247 |
666 |
621 |
413 |
153 |
0 |
| ODI |
1861 |
20 |
46 |
406 |
739 |
883 |
492 |
2 |
| CDI |
0 |
4 |
14 |
188 |
715 |
2829 |
4031 |
27 |
| VCDI |
0 |
0 |
1 |
79 |
666 |
2905 |
38420 |
45818 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
59053 |
13756 |
209 |
178 |
43 |
6 |
0 |
0 |
| OW |
695 |
1251 |
272 |
474 |
312 |
73 |
13 |
0 |
| VODI |
1835 |
376 |
238 |
665 |
662 |
413 |
175 |
0 |
| ODI |
1860 |
25 |
59 |
421 |
736 |
924 |
587 |
5 |
| CDI |
0 |
4 |
15 |
180 |
725 |
2775 |
4296 |
42 |
| VCDI |
0 |
0 |
1 |
79 |
632 |
2912 |
38033 |
45800 |
|
Date: 2025-04-28:
| 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 |
59567 |
13668 |
159 |
103 |
13 |
2 |
0 |
0 |
| OW |
701 |
1296 |
327 |
456 |
124 |
25 |
7 |
0 |
| VODI |
1817 |
269 |
335 |
1082 |
590 |
129 |
42 |
3 |
| ODI |
1872 |
15 |
38 |
385 |
1157 |
759 |
118 |
27 |
| CDI |
0 |
5 |
16 |
112 |
760 |
3603 |
1547 |
72 |
| VCDI |
0 |
0 |
0 |
37 |
635 |
3372 |
38985 |
46580 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
59570 |
13305 |
171 |
147 |
34 |
10 |
8 |
0 |
| OW |
697 |
1384 |
324 |
558 |
245 |
66 |
29 |
2 |
| VODI |
1858 |
465 |
231 |
736 |
687 |
412 |
134 |
60 |
| ODI |
1832 |
74 |
98 |
425 |
773 |
1067 |
377 |
45 |
| CDI |
0 |
25 |
45 |
237 |
768 |
2925 |
3936 |
99 |
| VCDI |
0 |
0 |
6 |
72 |
772 |
3410 |
36215 |
46476 |
|
Date: 2025-04-30:
| 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 |
59711 |
13260 |
158 |
96 |
9 |
0 |
0 |
0 |
| OW |
702 |
1384 |
373 |
508 |
212 |
28 |
1 |
1 |
| VODI |
1840 |
269 |
236 |
1050 |
739 |
193 |
27 |
22 |
| ODI |
1846 |
28 |
42 |
461 |
1075 |
625 |
129 |
30 |
| CDI |
0 |
8 |
14 |
182 |
889 |
3713 |
2813 |
97 |
| VCDI |
0 |
0 |
2 |
94 |
884 |
4476 |
38815 |
43768 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
59710 |
12880 |
230 |
217 |
60 |
10 |
0 |
0 |
| OW |
700 |
1452 |
288 |
622 |
397 |
139 |
10 |
0 |
| VODI |
1883 |
455 |
198 |
670 |
835 |
402 |
127 |
53 |
| ODI |
1806 |
140 |
68 |
480 |
798 |
1020 |
500 |
52 |
| CDI |
0 |
21 |
41 |
278 |
816 |
3261 |
5201 |
105 |
| VCDI |
0 |
1 |
0 |
124 |
902 |
4203 |
35947 |
43708 |
|
Date: 2025-05-02:
| 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 |
59235 |
13499 |
164 |
107 |
10 |
0 |
0 |
0 |
| OW |
690 |
1444 |
364 |
537 |
195 |
14 |
2 |
18 |
| VODI |
1859 |
313 |
256 |
1038 |
685 |
201 |
57 |
55 |
| ODI |
1823 |
49 |
68 |
519 |
1285 |
751 |
246 |
50 |
| CDI |
0 |
13 |
30 |
255 |
1233 |
4613 |
3178 |
90 |
| VCDI |
0 |
1 |
7 |
143 |
979 |
5277 |
35863 |
43594 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
59229 |
13232 |
286 |
290 |
87 |
9 |
0 |
0 |
| OW |
700 |
1488 |
298 |
701 |
400 |
139 |
46 |
0 |
| VODI |
1899 |
419 |
154 |
687 |
886 |
437 |
190 |
80 |
| ODI |
1779 |
132 |
90 |
427 |
934 |
1008 |
481 |
67 |
| CDI |
0 |
34 |
39 |
261 |
1005 |
4449 |
4852 |
183 |
| VCDI |
0 |
14 |
22 |
233 |
1075 |
4814 |
33777 |
43477 |
|
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