Validation of sea ice concentration - Asian sector
Bulletin date: 2025-04-03
Data source: OSI SAF N.H. multi-product sea ice concentration
Model vs. observations, sea ice class contingency tables
Date: 2025-03-28:
| 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 |
4 |
341 |
3 |
0 |
0 |
0 |
0 |
0 |
| OW |
8 |
213 |
13 |
15 |
8 |
0 |
0 |
0 |
| VODI |
12 |
171 |
17 |
61 |
20 |
3 |
0 |
0 |
| ODI |
1 |
75 |
8 |
60 |
29 |
14 |
1 |
9 |
| CDI |
0 |
55 |
39 |
46 |
149 |
133 |
19 |
44 |
| VCDI |
0 |
9 |
27 |
129 |
283 |
1197 |
7525 |
22355 |
|
...date precedes bulletin
|
Date: 2025-03-30:
| 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 |
0 |
323 |
0 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
281 |
7 |
14 |
1 |
0 |
0 |
0 |
| VODI |
0 |
175 |
23 |
51 |
11 |
3 |
0 |
0 |
| ODI |
0 |
53 |
24 |
82 |
46 |
19 |
7 |
4 |
| CDI |
0 |
21 |
35 |
139 |
202 |
198 |
48 |
9 |
| VCDI |
0 |
0 |
0 |
67 |
254 |
2002 |
7994 |
21003 |
|
...date precedes bulletin
|
Date: 2025-04-01:
| 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 |
372 |
12 |
21 |
0 |
0 |
0 |
0 |
| OW |
0 |
194 |
15 |
45 |
4 |
0 |
0 |
0 |
| VODI |
0 |
85 |
42 |
89 |
35 |
0 |
0 |
0 |
| ODI |
0 |
8 |
12 |
87 |
43 |
14 |
5 |
5 |
| CDI |
0 |
0 |
2 |
102 |
300 |
259 |
68 |
17 |
| VCDI |
0 |
0 |
0 |
0 |
74 |
1320 |
7885 |
21981 |
|
...date precedes bulletin
|
Date: 2025-04-03:
| 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 |
0 |
361 |
18 |
15 |
0 |
0 |
0 |
0 |
| OW |
0 |
160 |
11 |
38 |
8 |
4 |
0 |
0 |
| VODI |
0 |
87 |
10 |
72 |
63 |
43 |
0 |
0 |
| ODI |
0 |
24 |
19 |
58 |
72 |
34 |
0 |
0 |
| CDI |
0 |
9 |
8 |
67 |
164 |
235 |
30 |
11 |
| VCDI |
0 |
0 |
0 |
18 |
120 |
551 |
7547 |
23239 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
372 |
19 |
15 |
0 |
0 |
0 |
0 |
| OW |
0 |
152 |
10 |
39 |
17 |
27 |
0 |
0 |
| VODI |
0 |
89 |
10 |
72 |
56 |
22 |
0 |
0 |
| ODI |
0 |
21 |
20 |
58 |
78 |
30 |
0 |
0 |
| CDI |
0 |
7 |
7 |
63 |
163 |
251 |
34 |
10 |
| VCDI |
0 |
0 |
0 |
21 |
113 |
537 |
7543 |
23240 |
|
Date: 2025-04-05:
| 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 |
0 |
291 |
35 |
26 |
0 |
0 |
0 |
0 |
| OW |
0 |
156 |
26 |
41 |
2 |
0 |
0 |
0 |
| VODI |
0 |
78 |
20 |
69 |
50 |
59 |
0 |
0 |
| ODI |
0 |
35 |
18 |
41 |
62 |
54 |
5 |
3 |
| CDI |
0 |
6 |
22 |
97 |
123 |
336 |
52 |
55 |
| VCDI |
0 |
0 |
0 |
39 |
113 |
515 |
5774 |
24893 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
313 |
37 |
27 |
0 |
0 |
0 |
0 |
| OW |
0 |
135 |
19 |
40 |
3 |
5 |
0 |
0 |
| VODI |
0 |
74 |
25 |
68 |
51 |
52 |
0 |
0 |
| ODI |
0 |
36 |
15 |
43 |
55 |
71 |
5 |
5 |
| CDI |
0 |
8 |
25 |
84 |
129 |
345 |
69 |
59 |
| VCDI |
0 |
0 |
0 |
51 |
112 |
491 |
5757 |
24887 |
|
Date: 2025-04-07:
| 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 |
0 |
293 |
31 |
20 |
0 |
0 |
0 |
0 |
| OW |
0 |
138 |
38 |
55 |
0 |
0 |
0 |
0 |
| VODI |
0 |
24 |
19 |
148 |
22 |
0 |
0 |
0 |
| ODI |
0 |
0 |
2 |
66 |
41 |
5 |
6 |
4 |
| CDI |
0 |
0 |
0 |
19 |
180 |
375 |
105 |
25 |
| VCDI |
0 |
0 |
0 |
0 |
30 |
393 |
5383 |
25674 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
243 |
27 |
23 |
0 |
0 |
0 |
0 |
| OW |
0 |
124 |
23 |
45 |
0 |
0 |
0 |
0 |
| VODI |
0 |
66 |
19 |
82 |
11 |
5 |
0 |
0 |
| ODI |
0 |
20 |
17 |
69 |
19 |
56 |
4 |
10 |
| CDI |
0 |
2 |
4 |
84 |
124 |
341 |
124 |
29 |
| VCDI |
0 |
0 |
0 |
5 |
119 |
371 |
5366 |
25664 |
|
Date: 2025-04-09:
| 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 |
0 |
241 |
33 |
49 |
0 |
0 |
0 |
0 |
| OW |
0 |
67 |
19 |
107 |
0 |
0 |
0 |
0 |
| VODI |
0 |
12 |
10 |
116 |
46 |
0 |
0 |
0 |
| ODI |
0 |
0 |
2 |
39 |
58 |
3 |
0 |
0 |
| CDI |
0 |
0 |
0 |
33 |
179 |
107 |
26 |
12 |
| VCDI |
0 |
0 |
0 |
5 |
90 |
524 |
4815 |
26503 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
168 |
20 |
37 |
0 |
0 |
0 |
0 |
| OW |
0 |
95 |
24 |
88 |
1 |
0 |
0 |
0 |
| VODI |
0 |
46 |
7 |
99 |
27 |
0 |
0 |
0 |
| ODI |
0 |
11 |
13 |
66 |
26 |
5 |
0 |
3 |
| CDI |
0 |
0 |
0 |
47 |
190 |
147 |
12 |
81 |
| VCDI |
0 |
0 |
0 |
12 |
129 |
482 |
4829 |
26431 |
|
Date: 2025-04-11:
| 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 |
0 |
263 |
36 |
18 |
0 |
0 |
0 |
0 |
| OW |
0 |
148 |
28 |
66 |
1 |
0 |
0 |
0 |
| VODI |
0 |
88 |
11 |
108 |
10 |
2 |
0 |
0 |
| ODI |
0 |
31 |
14 |
45 |
47 |
12 |
0 |
0 |
| CDI |
0 |
23 |
16 |
79 |
183 |
141 |
2 |
4 |
| VCDI |
0 |
1 |
12 |
81 |
254 |
1453 |
6660 |
23259 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
134 |
15 |
10 |
0 |
0 |
0 |
0 |
| OW |
0 |
99 |
41 |
58 |
0 |
0 |
0 |
0 |
| VODI |
0 |
105 |
13 |
78 |
2 |
0 |
0 |
0 |
| ODI |
0 |
58 |
5 |
54 |
6 |
0 |
0 |
18 |
| CDI |
0 |
91 |
15 |
36 |
49 |
46 |
2 |
109 |
| VCDI |
0 |
67 |
28 |
161 |
438 |
1562 |
6660 |
23136 |
|
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