Validation of sea ice concentration - Asian sector
Bulletin date: 2025-05-08
Data source: OSI SAF N.H. AMSR sea ice concentration
Model vs. observations, sea ice class contingency tables
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 |
0 |
218 |
5 |
3 |
2 |
0 |
0 |
0 |
| OW |
0 |
192 |
18 |
37 |
27 |
6 |
1 |
18 |
| VODI |
0 |
60 |
39 |
113 |
45 |
4 |
11 |
55 |
| ODI |
0 |
16 |
25 |
92 |
135 |
25 |
27 |
50 |
| CDI |
0 |
6 |
22 |
135 |
339 |
506 |
260 |
81 |
| VCDI |
0 |
1 |
7 |
103 |
726 |
2450 |
12442 |
13780 |
|
...date precedes bulletin
|
Date: 2025-05-04:
| 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 |
0 |
237 |
5 |
3 |
0 |
1 |
0 |
0 |
| OW |
0 |
254 |
9 |
18 |
15 |
36 |
4 |
2 |
| VODI |
0 |
198 |
34 |
53 |
71 |
31 |
10 |
70 |
| ODI |
0 |
92 |
48 |
82 |
99 |
39 |
28 |
56 |
| CDI |
0 |
31 |
38 |
174 |
534 |
482 |
245 |
107 |
| VCDI |
0 |
17 |
18 |
86 |
697 |
3637 |
10014 |
14507 |
|
...date precedes bulletin
|
Date: 2025-05-06:
| 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 |
0 |
403 |
7 |
6 |
0 |
0 |
0 |
0 |
| OW |
0 |
351 |
38 |
42 |
9 |
2 |
1 |
0 |
| VODI |
0 |
116 |
68 |
121 |
71 |
22 |
6 |
9 |
| ODI |
0 |
22 |
25 |
191 |
210 |
61 |
21 |
21 |
| CDI |
0 |
33 |
20 |
267 |
810 |
1347 |
458 |
118 |
| VCDI |
0 |
8 |
4 |
66 |
434 |
1939 |
10238 |
14517 |
|
...date precedes bulletin
|
Date: 2025-05-08:
| 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 |
0 |
432 |
2 |
3 |
1 |
0 |
0 |
0 |
| OW |
1 |
349 |
21 |
15 |
11 |
4 |
2 |
10 |
| VODI |
12 |
125 |
96 |
209 |
93 |
2 |
15 |
29 |
| ODI |
0 |
48 |
47 |
200 |
176 |
34 |
25 |
56 |
| CDI |
0 |
35 |
61 |
250 |
864 |
875 |
406 |
149 |
| VCDI |
0 |
11 |
16 |
125 |
652 |
2409 |
11375 |
12836 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
434 |
2 |
4 |
4 |
0 |
0 |
0 |
| OW |
1 |
352 |
28 |
32 |
11 |
5 |
2 |
15 |
| VODI |
12 |
120 |
89 |
209 |
101 |
2 |
16 |
28 |
| ODI |
0 |
48 |
47 |
181 |
171 |
27 |
26 |
94 |
| CDI |
0 |
33 |
61 |
242 |
873 |
946 |
400 |
108 |
| VCDI |
0 |
13 |
16 |
134 |
637 |
2344 |
11379 |
12835 |
|
Date: 2025-05-10:
| 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 |
0 |
382 |
5 |
12 |
3 |
0 |
0 |
10 |
| OW |
16 |
300 |
24 |
43 |
15 |
5 |
5 |
30 |
| VODI |
3 |
204 |
81 |
156 |
86 |
6 |
30 |
67 |
| ODI |
0 |
81 |
51 |
179 |
136 |
38 |
70 |
86 |
| CDI |
0 |
169 |
95 |
329 |
597 |
943 |
652 |
71 |
| VCDI |
0 |
81 |
64 |
225 |
456 |
2418 |
11137 |
12721 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
391 |
4 |
16 |
6 |
2 |
0 |
20 |
| OW |
16 |
288 |
24 |
57 |
17 |
4 |
9 |
31 |
| VODI |
3 |
224 |
84 |
137 |
86 |
4 |
28 |
62 |
| ODI |
0 |
64 |
48 |
179 |
138 |
42 |
70 |
83 |
| CDI |
0 |
164 |
88 |
291 |
565 |
1142 |
579 |
72 |
| VCDI |
0 |
86 |
72 |
264 |
481 |
2216 |
11208 |
12717 |
|
Date: 2025-05-12:
| 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 |
22 |
469 |
0 |
14 |
1 |
1 |
0 |
3 |
| OW |
21 |
424 |
37 |
43 |
16 |
3 |
7 |
15 |
| VODI |
0 |
235 |
175 |
339 |
120 |
7 |
15 |
32 |
| ODI |
0 |
55 |
40 |
249 |
489 |
64 |
32 |
67 |
| CDI |
0 |
21 |
25 |
124 |
701 |
1860 |
565 |
84 |
| VCDI |
0 |
26 |
14 |
39 |
124 |
1749 |
13152 |
10603 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
20 |
393 |
0 |
20 |
1 |
0 |
2 |
66 |
| OW |
23 |
215 |
25 |
56 |
26 |
5 |
6 |
47 |
| VODI |
0 |
219 |
86 |
143 |
93 |
8 |
60 |
49 |
| ODI |
0 |
97 |
42 |
130 |
218 |
52 |
126 |
61 |
| CDI |
0 |
237 |
84 |
280 |
726 |
1266 |
825 |
30 |
| VCDI |
0 |
69 |
54 |
179 |
387 |
2353 |
12752 |
10551 |
|
Date: 2025-05-14:
| 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 |
7 |
565 |
8 |
4 |
1 |
0 |
8 |
0 |
| OW |
0 |
420 |
72 |
53 |
20 |
5 |
27 |
0 |
| VODI |
0 |
291 |
126 |
280 |
97 |
6 |
83 |
0 |
| ODI |
0 |
100 |
59 |
263 |
303 |
60 |
145 |
0 |
| CDI |
0 |
43 |
52 |
268 |
897 |
2043 |
1087 |
67 |
| VCDI |
0 |
10 |
16 |
40 |
200 |
2622 |
15794 |
5940 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
7 |
503 |
6 |
5 |
1 |
0 |
85 |
0 |
| OW |
0 |
181 |
44 |
57 |
27 |
3 |
47 |
0 |
| VODI |
0 |
274 |
60 |
119 |
67 |
12 |
124 |
0 |
| ODI |
0 |
116 |
76 |
204 |
211 |
58 |
218 |
5 |
| CDI |
0 |
289 |
93 |
388 |
795 |
1782 |
941 |
24 |
| VCDI |
0 |
66 |
54 |
135 |
417 |
2881 |
15729 |
5978 |
|
Date: 2025-05-16:
| 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 |
16 |
613 |
13 |
10 |
0 |
0 |
0 |
17 |
| OW |
0 |
473 |
51 |
49 |
17 |
2 |
5 |
31 |
| VODI |
0 |
411 |
114 |
156 |
68 |
4 |
37 |
59 |
| ODI |
0 |
205 |
86 |
290 |
257 |
25 |
185 |
48 |
| CDI |
0 |
92 |
87 |
496 |
841 |
1978 |
965 |
31 |
| VCDI |
0 |
17 |
16 |
48 |
286 |
2365 |
16929 |
4689 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
16 |
595 |
15 |
4 |
0 |
0 |
1 |
103 |
| OW |
0 |
199 |
38 |
70 |
16 |
0 |
19 |
29 |
| VODI |
0 |
357 |
43 |
75 |
61 |
8 |
115 |
20 |
| ODI |
0 |
177 |
85 |
238 |
227 |
24 |
257 |
16 |
| CDI |
0 |
356 |
120 |
422 |
733 |
1972 |
1035 |
17 |
| VCDI |
0 |
127 |
66 |
240 |
432 |
2370 |
16694 |
4690 |
|
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