Validation of sea ice concentration - Asian sector
Bulletin date: 2025-04-10
Data source: OSI SAF N.H. AMSR sea ice concentration
Model vs. observations, sea ice class contingency tables
Date: 2025-04-04:
| 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 |
288 |
11 |
2 |
0 |
0 |
0 |
0 |
| OW |
0 |
173 |
3 |
13 |
7 |
0 |
0 |
0 |
| VODI |
0 |
104 |
12 |
35 |
71 |
14 |
1 |
0 |
| ODI |
0 |
62 |
14 |
28 |
40 |
31 |
1 |
0 |
| CDI |
0 |
47 |
26 |
57 |
150 |
178 |
66 |
2 |
| VCDI |
0 |
13 |
15 |
44 |
116 |
745 |
8113 |
21600 |
|
...date precedes bulletin
|
Date: 2025-04-06:
| 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 |
191 |
11 |
10 |
0 |
0 |
0 |
0 |
| OW |
0 |
175 |
10 |
11 |
0 |
0 |
0 |
0 |
| VODI |
0 |
109 |
19 |
31 |
14 |
15 |
1 |
0 |
| ODI |
0 |
63 |
11 |
22 |
36 |
53 |
9 |
4 |
| CDI |
0 |
35 |
22 |
49 |
128 |
274 |
132 |
12 |
| VCDI |
0 |
15 |
9 |
34 |
79 |
402 |
7863 |
22233 |
|
...date precedes bulletin
|
Date: 2025-04-08:
| 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 |
211 |
12 |
26 |
7 |
0 |
0 |
0 |
| OW |
0 |
129 |
18 |
17 |
3 |
0 |
0 |
0 |
| VODI |
0 |
39 |
26 |
49 |
17 |
1 |
0 |
0 |
| ODI |
0 |
3 |
6 |
43 |
31 |
14 |
0 |
9 |
| CDI |
0 |
0 |
1 |
33 |
102 |
221 |
95 |
37 |
| VCDI |
0 |
0 |
0 |
4 |
46 |
458 |
8726 |
21698 |
|
...date precedes bulletin
|
Date: 2025-04-10:
| 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 |
7 |
12 |
5 |
0 |
0 |
0 |
| OW |
0 |
124 |
22 |
13 |
9 |
0 |
0 |
0 |
| VODI |
0 |
82 |
23 |
58 |
8 |
0 |
0 |
0 |
| ODI |
0 |
45 |
25 |
27 |
10 |
3 |
0 |
0 |
| CDI |
0 |
37 |
29 |
133 |
78 |
55 |
19 |
0 |
| VCDI |
0 |
3 |
12 |
85 |
211 |
849 |
6544 |
23352 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
192 |
7 |
13 |
5 |
0 |
0 |
0 |
| OW |
0 |
141 |
22 |
11 |
11 |
0 |
0 |
0 |
| VODI |
0 |
80 |
23 |
58 |
7 |
0 |
0 |
0 |
| ODI |
0 |
45 |
28 |
40 |
11 |
4 |
0 |
0 |
| CDI |
0 |
30 |
27 |
133 |
97 |
87 |
18 |
2 |
| VCDI |
0 |
5 |
11 |
73 |
190 |
816 |
6545 |
23350 |
|
Date: 2025-04-12:
| 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 |
197 |
12 |
11 |
4 |
0 |
0 |
0 |
| OW |
0 |
164 |
18 |
19 |
9 |
0 |
0 |
0 |
| VODI |
0 |
81 |
19 |
37 |
31 |
0 |
0 |
0 |
| ODI |
0 |
47 |
6 |
33 |
19 |
19 |
17 |
0 |
| CDI |
0 |
55 |
15 |
45 |
87 |
195 |
81 |
21 |
| VCDI |
0 |
39 |
23 |
71 |
195 |
1102 |
10198 |
19212 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
188 |
14 |
16 |
4 |
0 |
0 |
0 |
| OW |
0 |
176 |
18 |
16 |
13 |
0 |
0 |
0 |
| VODI |
0 |
82 |
15 |
37 |
28 |
0 |
0 |
0 |
| ODI |
0 |
54 |
9 |
32 |
19 |
30 |
20 |
0 |
| CDI |
0 |
41 |
11 |
42 |
104 |
250 |
103 |
18 |
| VCDI |
0 |
42 |
26 |
73 |
177 |
1036 |
10173 |
19215 |
|
Date: 2025-04-14:
| 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 |
7 |
7 |
1 |
0 |
0 |
0 |
| OW |
0 |
218 |
18 |
15 |
16 |
0 |
0 |
0 |
| VODI |
0 |
65 |
17 |
63 |
28 |
0 |
2 |
0 |
| ODI |
0 |
23 |
13 |
37 |
42 |
9 |
25 |
0 |
| CDI |
0 |
12 |
17 |
86 |
196 |
242 |
131 |
7 |
| VCDI |
0 |
0 |
0 |
21 |
88 |
779 |
11196 |
18464 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
203 |
6 |
9 |
5 |
0 |
0 |
0 |
| OW |
0 |
166 |
15 |
15 |
14 |
0 |
0 |
0 |
| VODI |
0 |
93 |
12 |
39 |
32 |
0 |
7 |
0 |
| ODI |
0 |
44 |
12 |
34 |
48 |
11 |
33 |
3 |
| CDI |
0 |
32 |
12 |
70 |
159 |
186 |
217 |
13 |
| VCDI |
0 |
17 |
15 |
62 |
113 |
833 |
11097 |
18455 |
|
Date: 2025-04-16:
| 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 |
253 |
9 |
2 |
0 |
0 |
0 |
0 |
| OW |
0 |
155 |
10 |
13 |
6 |
0 |
0 |
0 |
| VODI |
0 |
71 |
19 |
39 |
20 |
7 |
0 |
0 |
| ODI |
0 |
32 |
22 |
42 |
21 |
32 |
14 |
0 |
| CDI |
0 |
2 |
6 |
89 |
194 |
350 |
318 |
22 |
| VCDI |
0 |
0 |
0 |
20 |
73 |
878 |
11528 |
17835 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
176 |
7 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
165 |
13 |
13 |
8 |
0 |
0 |
0 |
| VODI |
0 |
126 |
15 |
30 |
22 |
9 |
7 |
0 |
| ODI |
0 |
38 |
17 |
33 |
52 |
42 |
22 |
2 |
| CDI |
0 |
8 |
14 |
95 |
124 |
272 |
295 |
50 |
| VCDI |
0 |
0 |
0 |
34 |
108 |
944 |
11536 |
17805 |
|
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 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
143 |
20 |
15 |
0 |
0 |
0 |
0 |
| OW |
0 |
143 |
14 |
14 |
4 |
0 |
0 |
0 |
| VODI |
0 |
61 |
15 |
36 |
16 |
1 |
1 |
3 |
| ODI |
0 |
19 |
26 |
38 |
14 |
25 |
26 |
33 |
| CDI |
0 |
0 |
5 |
98 |
153 |
234 |
295 |
110 |
| VCDI |
0 |
0 |
0 |
10 |
147 |
833 |
11739 |
17791 |
|
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