Validation of sea ice concentration - Asian sector
Bulletin date: 2025-05-15
Data source: OSI SAF N.H. multi-product sea ice concentration
Model vs. observations, sea ice class contingency tables
Date: 2025-05-09:
| 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 |
151 |
405 |
0 |
16 |
3 |
0 |
0 |
5 |
| OW |
31 |
236 |
43 |
124 |
33 |
3 |
2 |
22 |
| VODI |
11 |
38 |
33 |
350 |
136 |
11 |
16 |
57 |
| ODI |
0 |
9 |
7 |
216 |
271 |
25 |
40 |
94 |
| CDI |
0 |
5 |
10 |
276 |
1095 |
887 |
464 |
82 |
| VCDI |
0 |
0 |
0 |
128 |
656 |
3048 |
8890 |
15167 |
|
...date precedes bulletin
|
Date: 2025-05-11:
| 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 |
151 |
382 |
0 |
18 |
2 |
0 |
0 |
26 |
| OW |
31 |
219 |
30 |
74 |
39 |
3 |
7 |
52 |
| VODI |
0 |
55 |
66 |
290 |
148 |
11 |
43 |
81 |
| ODI |
0 |
33 |
38 |
176 |
290 |
32 |
124 |
56 |
| CDI |
0 |
115 |
100 |
293 |
889 |
1252 |
749 |
44 |
| VCDI |
0 |
6 |
15 |
211 |
596 |
2343 |
8752 |
15254 |
|
...date precedes bulletin
|
Date: 2025-05-13:
| 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 |
202 |
497 |
1 |
22 |
1 |
2 |
0 |
7 |
| OW |
11 |
295 |
110 |
135 |
30 |
2 |
2 |
26 |
| VODI |
0 |
73 |
83 |
567 |
138 |
8 |
14 |
70 |
| ODI |
0 |
30 |
25 |
268 |
504 |
55 |
62 |
75 |
| CDI |
0 |
0 |
0 |
148 |
1073 |
2168 |
577 |
120 |
| VCDI |
0 |
0 |
0 |
32 |
218 |
2817 |
9244 |
13384 |
|
...date precedes bulletin
|
Date: 2025-05-15:
| 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 |
130 |
616 |
6 |
25 |
0 |
0 |
0 |
17 |
| OW |
0 |
303 |
104 |
194 |
11 |
3 |
0 |
35 |
| VODI |
0 |
123 |
104 |
461 |
103 |
23 |
28 |
76 |
| ODI |
0 |
24 |
57 |
349 |
383 |
57 |
151 |
66 |
| CDI |
0 |
1 |
9 |
275 |
1308 |
2219 |
846 |
165 |
| VCDI |
0 |
0 |
0 |
22 |
260 |
2296 |
12583 |
9663 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
130 |
617 |
13 |
41 |
0 |
0 |
0 |
28 |
| OW |
0 |
295 |
95 |
214 |
16 |
4 |
2 |
30 |
| VODI |
0 |
136 |
118 |
439 |
111 |
28 |
20 |
66 |
| ODI |
0 |
18 |
43 |
365 |
396 |
58 |
135 |
71 |
| CDI |
0 |
1 |
11 |
240 |
1267 |
2239 |
857 |
167 |
| VCDI |
0 |
0 |
0 |
27 |
275 |
2269 |
12594 |
9660 |
|
Date: 2025-05-17:
| 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 |
162 |
618 |
5 |
17 |
0 |
0 |
0 |
16 |
| OW |
0 |
387 |
76 |
128 |
9 |
2 |
0 |
36 |
| VODI |
0 |
231 |
145 |
345 |
57 |
5 |
35 |
82 |
| ODI |
0 |
68 |
79 |
450 |
345 |
48 |
196 |
80 |
| CDI |
0 |
3 |
9 |
482 |
1265 |
2230 |
970 |
265 |
| VCDI |
0 |
0 |
0 |
32 |
323 |
1984 |
9686 |
12225 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
162 |
630 |
7 |
25 |
0 |
0 |
0 |
22 |
| OW |
0 |
369 |
75 |
156 |
13 |
0 |
3 |
35 |
| VODI |
0 |
254 |
153 |
327 |
64 |
8 |
29 |
72 |
| ODI |
0 |
52 |
71 |
473 |
359 |
51 |
154 |
79 |
| CDI |
0 |
2 |
8 |
437 |
1202 |
2219 |
1080 |
397 |
| VCDI |
0 |
0 |
0 |
36 |
361 |
1991 |
9621 |
12099 |
|
Date: 2025-05-19:
| 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 |
153 |
668 |
11 |
5 |
0 |
0 |
0 |
12 |
| OW |
0 |
638 |
199 |
145 |
11 |
1 |
1 |
13 |
| VODI |
0 |
13 |
95 |
973 |
100 |
13 |
1 |
35 |
| ODI |
0 |
0 |
0 |
377 |
859 |
92 |
35 |
62 |
| CDI |
0 |
0 |
0 |
109 |
925 |
3482 |
595 |
102 |
| VCDI |
0 |
0 |
0 |
3 |
158 |
1679 |
11691 |
9840 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
153 |
567 |
1 |
4 |
0 |
0 |
0 |
28 |
| OW |
0 |
346 |
61 |
102 |
7 |
0 |
1 |
47 |
| VODI |
0 |
281 |
124 |
352 |
44 |
17 |
30 |
75 |
| ODI |
0 |
119 |
73 |
498 |
424 |
73 |
195 |
66 |
| CDI |
0 |
6 |
46 |
590 |
1176 |
2821 |
1037 |
1090 |
| VCDI |
0 |
0 |
0 |
66 |
402 |
2356 |
11060 |
8758 |
|
Date: 2025-05-21:
| 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 |
179 |
598 |
8 |
14 |
3 |
0 |
0 |
6 |
| OW |
0 |
654 |
141 |
152 |
9 |
2 |
0 |
14 |
| VODI |
0 |
135 |
172 |
822 |
166 |
19 |
4 |
52 |
| ODI |
0 |
5 |
17 |
418 |
834 |
95 |
76 |
70 |
| CDI |
0 |
0 |
0 |
152 |
1193 |
3564 |
1232 |
305 |
| VCDI |
0 |
0 |
0 |
2 |
102 |
2902 |
11500 |
7479 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
179 |
504 |
3 |
14 |
4 |
0 |
0 |
21 |
| OW |
0 |
306 |
35 |
88 |
6 |
7 |
1 |
53 |
| VODI |
0 |
309 |
135 |
389 |
73 |
16 |
66 |
73 |
| ODI |
0 |
223 |
85 |
456 |
569 |
97 |
255 |
84 |
| CDI |
0 |
50 |
80 |
578 |
1334 |
2662 |
1208 |
1637 |
| VCDI |
0 |
0 |
0 |
35 |
321 |
3800 |
11282 |
6058 |
|
Date: 2025-05-23:
| 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 |
150 |
614 |
6 |
18 |
0 |
0 |
0 |
1 |
| OW |
0 |
611 |
161 |
150 |
19 |
4 |
1 |
10 |
| VODI |
0 |
216 |
134 |
818 |
153 |
18 |
21 |
53 |
| ODI |
0 |
21 |
26 |
402 |
960 |
121 |
97 |
68 |
| CDI |
0 |
0 |
1 |
158 |
1280 |
3864 |
2191 |
287 |
| VCDI |
0 |
0 |
0 |
0 |
76 |
2030 |
11262 |
7094 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
150 |
480 |
9 |
24 |
0 |
1 |
0 |
13 |
| OW |
0 |
275 |
47 |
87 |
11 |
0 |
2 |
54 |
| VODI |
0 |
357 |
128 |
423 |
73 |
24 |
87 |
71 |
| ODI |
0 |
259 |
76 |
447 |
601 |
135 |
333 |
75 |
| CDI |
0 |
91 |
67 |
499 |
1491 |
2688 |
1368 |
2169 |
| VCDI |
0 |
0 |
1 |
66 |
312 |
3189 |
11782 |
5131 |
|
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