Validation of sea ice concentration - Asian sector
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 |
0 |
202 |
17 |
18 |
0 |
0 |
0 |
0 |
| OW |
0 |
105 |
20 |
16 |
3 |
0 |
0 |
0 |
| VODI |
0 |
49 |
29 |
40 |
22 |
5 |
0 |
3 |
| ODI |
0 |
10 |
14 |
66 |
44 |
20 |
21 |
8 |
| CDI |
0 |
0 |
0 |
68 |
144 |
260 |
306 |
37 |
| VCDI |
0 |
0 |
0 |
3 |
121 |
808 |
11734 |
17889 |
|
...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 |
0 |
107 |
8 |
29 |
8 |
0 |
0 |
0 |
| OW |
0 |
103 |
24 |
15 |
14 |
0 |
0 |
0 |
| VODI |
0 |
43 |
28 |
57 |
17 |
1 |
0 |
0 |
| ODI |
0 |
1 |
2 |
56 |
56 |
43 |
11 |
0 |
| CDI |
0 |
0 |
0 |
8 |
103 |
239 |
265 |
29 |
| VCDI |
0 |
0 |
0 |
6 |
112 |
955 |
11611 |
18131 |
|
...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 |
0 |
115 |
13 |
24 |
9 |
1 |
0 |
0 |
| OW |
0 |
111 |
25 |
17 |
14 |
8 |
0 |
0 |
| VODI |
0 |
17 |
27 |
64 |
18 |
25 |
2 |
0 |
| ODI |
0 |
0 |
1 |
25 |
84 |
74 |
16 |
18 |
| CDI |
0 |
0 |
0 |
5 |
88 |
496 |
442 |
43 |
| VCDI |
0 |
0 |
0 |
1 |
88 |
668 |
10811 |
18732 |
|
...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 |
0 |
127 |
13 |
23 |
9 |
1 |
0 |
0 |
| OW |
0 |
135 |
13 |
8 |
11 |
12 |
5 |
0 |
| VODI |
0 |
52 |
28 |
47 |
11 |
21 |
6 |
0 |
| ODI |
0 |
3 |
4 |
33 |
78 |
61 |
52 |
23 |
| CDI |
0 |
0 |
2 |
24 |
127 |
391 |
358 |
50 |
| VCDI |
0 |
0 |
0 |
15 |
278 |
699 |
10706 |
18656 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
134 |
13 |
24 |
10 |
2 |
1 |
0 |
| OW |
0 |
129 |
14 |
7 |
10 |
11 |
5 |
0 |
| VODI |
0 |
51 |
26 |
44 |
12 |
25 |
11 |
4 |
| ODI |
0 |
3 |
6 |
36 |
92 |
78 |
63 |
25 |
| CDI |
0 |
0 |
1 |
23 |
106 |
382 |
478 |
60 |
| VCDI |
0 |
0 |
0 |
16 |
284 |
687 |
10569 |
18640 |
|
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 |
0 |
152 |
11 |
13 |
9 |
3 |
0 |
0 |
| OW |
0 |
155 |
4 |
3 |
14 |
13 |
2 |
0 |
| VODI |
0 |
121 |
34 |
27 |
21 |
19 |
27 |
0 |
| ODI |
0 |
15 |
8 |
85 |
64 |
43 |
77 |
2 |
| CDI |
0 |
4 |
7 |
54 |
187 |
433 |
350 |
20 |
| VCDI |
0 |
0 |
0 |
43 |
391 |
762 |
12508 |
16401 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
171 |
11 |
14 |
11 |
5 |
0 |
0 |
| OW |
0 |
141 |
5 |
2 |
13 |
13 |
7 |
0 |
| VODI |
0 |
116 |
30 |
27 |
23 |
18 |
40 |
0 |
| ODI |
0 |
15 |
11 |
92 |
67 |
61 |
86 |
5 |
| CDI |
0 |
4 |
7 |
45 |
191 |
398 |
411 |
30 |
| VCDI |
0 |
0 |
0 |
45 |
381 |
778 |
12420 |
16388 |
|
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 |
0 |
154 |
3 |
9 |
2 |
0 |
0 |
0 |
| OW |
0 |
211 |
16 |
4 |
11 |
3 |
1 |
0 |
| VODI |
0 |
43 |
32 |
110 |
34 |
10 |
5 |
3 |
| ODI |
0 |
4 |
4 |
79 |
124 |
66 |
10 |
27 |
| CDI |
0 |
2 |
4 |
56 |
229 |
530 |
180 |
64 |
| VCDI |
0 |
0 |
0 |
13 |
345 |
811 |
13536 |
15347 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
134 |
4 |
11 |
7 |
0 |
0 |
0 |
| OW |
0 |
131 |
9 |
7 |
14 |
6 |
0 |
2 |
| VODI |
0 |
125 |
29 |
58 |
31 |
17 |
6 |
60 |
| ODI |
0 |
19 |
12 |
97 |
107 |
98 |
41 |
35 |
| CDI |
0 |
5 |
5 |
73 |
185 |
412 |
475 |
59 |
| VCDI |
0 |
0 |
0 |
25 |
401 |
887 |
13210 |
15285 |
|
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 |
0 |
190 |
6 |
2 |
0 |
0 |
0 |
0 |
| OW |
0 |
185 |
26 |
18 |
17 |
6 |
1 |
1 |
| VODI |
0 |
29 |
19 |
126 |
59 |
2 |
9 |
22 |
| ODI |
0 |
4 |
8 |
72 |
113 |
61 |
32 |
30 |
| CDI |
0 |
1 |
5 |
74 |
189 |
305 |
506 |
91 |
| VCDI |
0 |
0 |
2 |
70 |
575 |
1636 |
12327 |
15263 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
92 |
6 |
5 |
0 |
0 |
0 |
0 |
| OW |
0 |
157 |
10 |
5 |
14 |
4 |
0 |
0 |
| VODI |
0 |
116 |
27 |
83 |
57 |
9 |
11 |
53 |
| ODI |
0 |
36 |
13 |
111 |
106 |
100 |
83 |
47 |
| CDI |
0 |
8 |
10 |
78 |
164 |
322 |
987 |
81 |
| VCDI |
0 |
0 |
0 |
80 |
612 |
1575 |
11794 |
15226 |
|
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 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
82 |
3 |
4 |
1 |
0 |
0 |
0 |
| OW |
0 |
166 |
10 |
6 |
18 |
7 |
4 |
0 |
| VODI |
0 |
153 |
25 |
83 |
62 |
23 |
20 |
80 |
| ODI |
0 |
53 |
32 |
119 |
106 |
83 |
68 |
60 |
| CDI |
0 |
25 |
24 |
97 |
266 |
725 |
867 |
71 |
| VCDI |
0 |
14 |
22 |
174 |
821 |
2153 |
11782 |
13773 |
|
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