Validation of sea ice concentration - Asian sector
Bulletin date: 2025-04-03
Data source: OSI SAF N.H. AMSR 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 |
3 |
259 |
0 |
0 |
0 |
0 |
0 |
0 |
| OW |
4 |
217 |
4 |
1 |
0 |
0 |
0 |
0 |
| VODI |
0 |
200 |
13 |
22 |
7 |
1 |
0 |
0 |
| ODI |
0 |
92 |
20 |
20 |
24 |
7 |
20 |
0 |
| CDI |
0 |
84 |
27 |
67 |
72 |
107 |
63 |
3 |
| VCDI |
0 |
103 |
32 |
106 |
188 |
1121 |
9147 |
20048 |
|
...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 |
1 |
232 |
0 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
252 |
1 |
0 |
0 |
0 |
0 |
0 |
| VODI |
0 |
197 |
19 |
9 |
13 |
0 |
0 |
0 |
| ODI |
0 |
103 |
15 |
38 |
23 |
15 |
12 |
3 |
| CDI |
0 |
114 |
36 |
87 |
133 |
190 |
36 |
6 |
| VCDI |
0 |
33 |
20 |
90 |
207 |
1738 |
10491 |
17968 |
|
...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 |
296 |
3 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
193 |
10 |
8 |
5 |
0 |
0 |
0 |
| VODI |
0 |
133 |
17 |
33 |
43 |
1 |
0 |
0 |
| ODI |
0 |
41 |
21 |
32 |
36 |
8 |
7 |
0 |
| CDI |
0 |
17 |
20 |
86 |
214 |
261 |
114 |
0 |
| VCDI |
0 |
2 |
1 |
9 |
66 |
1208 |
10770 |
18427 |
|
...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 |
297 |
0 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
169 |
11 |
6 |
5 |
0 |
0 |
0 |
| VODI |
0 |
105 |
12 |
27 |
61 |
31 |
0 |
0 |
| ODI |
0 |
60 |
16 |
28 |
48 |
16 |
5 |
0 |
| CDI |
0 |
38 |
17 |
58 |
154 |
170 |
51 |
3 |
| VCDI |
0 |
4 |
5 |
39 |
108 |
611 |
8752 |
21175 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
309 |
0 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
160 |
11 |
7 |
22 |
13 |
0 |
0 |
| VODI |
0 |
106 |
11 |
29 |
46 |
20 |
0 |
0 |
| ODI |
0 |
60 |
15 |
28 |
49 |
14 |
5 |
0 |
| CDI |
0 |
35 |
20 |
57 |
154 |
184 |
53 |
3 |
| VCDI |
0 |
3 |
4 |
37 |
105 |
597 |
8750 |
21175 |
|
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 |
227 |
15 |
20 |
0 |
0 |
0 |
0 |
| OW |
0 |
178 |
12 |
11 |
0 |
0 |
0 |
0 |
| VODI |
0 |
96 |
14 |
26 |
57 |
26 |
1 |
0 |
| ODI |
0 |
64 |
12 |
12 |
47 |
41 |
15 |
0 |
| CDI |
0 |
58 |
25 |
50 |
123 |
262 |
135 |
6 |
| VCDI |
0 |
16 |
18 |
33 |
82 |
525 |
10033 |
19842 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
252 |
15 |
20 |
0 |
0 |
0 |
0 |
| OW |
0 |
153 |
12 |
12 |
3 |
3 |
0 |
0 |
| VODI |
0 |
98 |
11 |
23 |
54 |
25 |
0 |
0 |
| ODI |
0 |
60 |
14 |
13 |
48 |
46 |
16 |
0 |
| CDI |
0 |
53 |
22 |
49 |
130 |
270 |
154 |
5 |
| VCDI |
0 |
23 |
22 |
35 |
74 |
510 |
10014 |
19843 |
|
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 |
227 |
12 |
17 |
0 |
0 |
0 |
0 |
| OW |
0 |
172 |
11 |
10 |
0 |
0 |
0 |
0 |
| VODI |
0 |
76 |
27 |
51 |
18 |
2 |
0 |
0 |
| ODI |
0 |
14 |
14 |
48 |
28 |
10 |
10 |
3 |
| CDI |
0 |
4 |
5 |
56 |
104 |
335 |
131 |
33 |
| VCDI |
0 |
0 |
0 |
1 |
28 |
426 |
9248 |
20961 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
177 |
11 |
13 |
0 |
0 |
0 |
0 |
| OW |
0 |
143 |
8 |
14 |
0 |
0 |
0 |
0 |
| VODI |
0 |
88 |
14 |
26 |
3 |
5 |
0 |
0 |
| ODI |
0 |
57 |
15 |
32 |
19 |
47 |
3 |
6 |
| CDI |
0 |
27 |
20 |
63 |
84 |
312 |
125 |
36 |
| VCDI |
0 |
1 |
1 |
35 |
72 |
409 |
9261 |
20955 |
|
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 |
199 |
13 |
20 |
5 |
0 |
0 |
0 |
| OW |
0 |
101 |
28 |
16 |
4 |
0 |
0 |
0 |
| VODI |
0 |
39 |
23 |
73 |
16 |
1 |
0 |
0 |
| ODI |
0 |
4 |
7 |
40 |
32 |
4 |
0 |
0 |
| CDI |
0 |
0 |
7 |
74 |
132 |
81 |
43 |
12 |
| VCDI |
0 |
0 |
0 |
31 |
100 |
565 |
7688 |
22724 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
110 |
17 |
9 |
0 |
0 |
0 |
0 |
| OW |
0 |
121 |
11 |
31 |
8 |
0 |
0 |
0 |
| VODI |
0 |
72 |
16 |
46 |
15 |
0 |
0 |
0 |
| ODI |
0 |
38 |
21 |
32 |
14 |
1 |
0 |
1 |
| CDI |
0 |
2 |
11 |
86 |
150 |
115 |
31 |
80 |
| VCDI |
0 |
0 |
2 |
50 |
102 |
535 |
7700 |
22655 |
|
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 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
64 |
0 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
107 |
23 |
18 |
4 |
0 |
0 |
0 |
| VODI |
0 |
108 |
20 |
40 |
13 |
0 |
0 |
1 |
| ODI |
0 |
68 |
6 |
34 |
11 |
0 |
0 |
25 |
| CDI |
0 |
113 |
8 |
29 |
21 |
47 |
14 |
106 |
| VCDI |
0 |
142 |
40 |
200 |
317 |
1290 |
8655 |
20558 |
|
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