Validation of sea ice concentration - Asian sector
Bulletin date: 2025-04-17
Data source: OSI SAF N.H. AMSR sea ice concentration
Model vs. observations, sea ice class contingency tables
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 |
207 |
7 |
8 |
4 |
0 |
0 |
0 |
| OW |
0 |
149 |
19 |
23 |
8 |
0 |
0 |
0 |
| VODI |
0 |
95 |
19 |
53 |
14 |
0 |
0 |
0 |
| ODI |
0 |
56 |
9 |
44 |
16 |
5 |
0 |
0 |
| CDI |
0 |
65 |
22 |
60 |
124 |
125 |
21 |
3 |
| VCDI |
0 |
30 |
21 |
133 |
200 |
1207 |
8648 |
20687 |
|
...date precedes bulletin
|
Date: 2025-04-13:
| 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 |
0 |
192 |
8 |
9 |
3 |
0 |
0 |
0 |
| OW |
0 |
162 |
11 |
20 |
10 |
1 |
0 |
0 |
| VODI |
0 |
79 |
20 |
32 |
33 |
4 |
0 |
0 |
| ODI |
0 |
51 |
4 |
17 |
42 |
7 |
27 |
0 |
| CDI |
0 |
57 |
24 |
25 |
92 |
187 |
130 |
19 |
| VCDI |
0 |
19 |
23 |
65 |
163 |
1063 |
12083 |
17400 |
|
...date precedes bulletin
|
Date: 2025-04-15:
| 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 |
0 |
244 |
7 |
3 |
0 |
0 |
0 |
0 |
| OW |
0 |
177 |
18 |
19 |
10 |
0 |
0 |
0 |
| VODI |
0 |
87 |
24 |
41 |
20 |
2 |
2 |
0 |
| ODI |
0 |
20 |
22 |
49 |
24 |
17 |
28 |
0 |
| CDI |
0 |
4 |
13 |
102 |
207 |
278 |
226 |
5 |
| VCDI |
0 |
0 |
0 |
13 |
106 |
984 |
11174 |
18156 |
|
...date precedes bulletin
|
Date: 2025-04-17:
| 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 |
0 |
237 |
13 |
11 |
0 |
0 |
0 |
0 |
| OW |
0 |
117 |
23 |
18 |
2 |
0 |
0 |
0 |
| VODI |
0 |
52 |
27 |
44 |
20 |
2 |
0 |
0 |
| ODI |
0 |
12 |
25 |
55 |
23 |
35 |
17 |
5 |
| CDI |
0 |
0 |
2 |
75 |
191 |
303 |
263 |
21 |
| VCDI |
0 |
0 |
0 |
5 |
77 |
871 |
11722 |
17814 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
242 |
14 |
11 |
0 |
0 |
0 |
0 |
| OW |
0 |
114 |
26 |
17 |
2 |
0 |
0 |
0 |
| VODI |
0 |
53 |
25 |
46 |
23 |
3 |
1 |
0 |
| ODI |
0 |
9 |
23 |
54 |
24 |
37 |
20 |
5 |
| CDI |
0 |
0 |
2 |
76 |
186 |
298 |
345 |
23 |
| VCDI |
0 |
0 |
0 |
4 |
78 |
873 |
11636 |
17812 |
|
Date: 2025-04-19:
| 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 |
0 |
138 |
14 |
28 |
4 |
0 |
0 |
0 |
| OW |
0 |
108 |
20 |
9 |
8 |
0 |
0 |
0 |
| VODI |
0 |
45 |
27 |
60 |
19 |
8 |
1 |
3 |
| ODI |
0 |
1 |
5 |
69 |
41 |
42 |
12 |
8 |
| CDI |
0 |
0 |
0 |
27 |
129 |
228 |
262 |
79 |
| VCDI |
0 |
0 |
0 |
3 |
54 |
925 |
11448 |
18257 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
147 |
11 |
30 |
5 |
0 |
0 |
0 |
| OW |
0 |
102 |
29 |
9 |
8 |
0 |
0 |
0 |
| VODI |
0 |
42 |
23 |
62 |
20 |
11 |
1 |
1 |
| ODI |
0 |
1 |
3 |
62 |
43 |
39 |
14 |
10 |
| CDI |
0 |
0 |
0 |
29 |
112 |
232 |
308 |
96 |
| VCDI |
0 |
0 |
0 |
4 |
67 |
921 |
11400 |
18240 |
|
Date: 2025-04-21:
| 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 |
0 |
118 |
14 |
24 |
8 |
0 |
0 |
0 |
| OW |
0 |
108 |
25 |
19 |
20 |
0 |
0 |
0 |
| VODI |
0 |
12 |
26 |
77 |
39 |
31 |
4 |
1 |
| ODI |
0 |
0 |
1 |
25 |
77 |
82 |
32 |
2 |
| CDI |
0 |
0 |
0 |
4 |
108 |
542 |
354 |
30 |
| VCDI |
0 |
0 |
0 |
0 |
38 |
595 |
10722 |
18944 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
101 |
8 |
25 |
19 |
0 |
0 |
0 |
| OW |
0 |
96 |
28 |
13 |
8 |
0 |
0 |
0 |
| VODI |
0 |
40 |
28 |
57 |
17 |
4 |
2 |
0 |
| ODI |
0 |
1 |
2 |
49 |
57 |
59 |
12 |
4 |
| CDI |
0 |
0 |
0 |
3 |
92 |
279 |
268 |
61 |
| VCDI |
0 |
0 |
0 |
2 |
97 |
908 |
10830 |
18912 |
|
Date: 2025-04-23:
| 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 |
0 |
115 |
13 |
24 |
13 |
3 |
0 |
0 |
| OW |
0 |
115 |
22 |
13 |
8 |
12 |
3 |
0 |
| VODI |
0 |
27 |
21 |
54 |
17 |
21 |
3 |
3 |
| ODI |
0 |
2 |
6 |
12 |
89 |
66 |
32 |
23 |
| CDI |
0 |
0 |
1 |
19 |
69 |
438 |
495 |
34 |
| VCDI |
0 |
0 |
0 |
42 |
236 |
697 |
11056 |
18278 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
81 |
3 |
10 |
17 |
8 |
0 |
0 |
| OW |
0 |
103 |
13 |
16 |
4 |
11 |
4 |
0 |
| VODI |
0 |
73 |
41 |
22 |
3 |
4 |
8 |
7 |
| ODI |
0 |
2 |
6 |
65 |
87 |
34 |
24 |
20 |
| CDI |
0 |
0 |
0 |
7 |
98 |
404 |
467 |
47 |
| VCDI |
0 |
0 |
0 |
44 |
223 |
776 |
11086 |
18264 |
|
Date: 2025-04-25:
| 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 |
151 |
9 |
16 |
11 |
0 |
0 |
0 |
| OW |
0 |
161 |
2 |
7 |
12 |
7 |
7 |
0 |
| VODI |
0 |
95 |
37 |
18 |
18 |
12 |
16 |
0 |
| ODI |
0 |
13 |
8 |
71 |
76 |
43 |
68 |
7 |
| CDI |
0 |
2 |
7 |
56 |
186 |
429 |
243 |
29 |
| VCDI |
0 |
0 |
0 |
53 |
376 |
816 |
12481 |
16539 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
82 |
0 |
6 |
6 |
0 |
0 |
0 |
| OW |
0 |
56 |
6 |
14 |
19 |
9 |
12 |
0 |
| VODI |
0 |
135 |
15 |
16 |
24 |
10 |
29 |
11 |
| ODI |
0 |
104 |
15 |
35 |
41 |
6 |
65 |
23 |
| CDI |
0 |
45 |
25 |
77 |
191 |
238 |
302 |
76 |
| VCDI |
0 |
0 |
2 |
73 |
398 |
1044 |
12407 |
16465 |
|
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