Validation of sea ice concentration - Asian sector
Bulletin date: 2025-05-01
Data source: OSI SAF N.H. AMSR sea ice concentration
Model vs. observations, sea ice class contingency tables
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 |
|
...date precedes bulletin
|
Date: 2025-04-27:
| 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 |
121 |
9 |
11 |
8 |
0 |
0 |
0 |
| OW |
0 |
159 |
7 |
6 |
14 |
12 |
6 |
0 |
| VODI |
0 |
117 |
27 |
50 |
32 |
22 |
40 |
0 |
| ODI |
0 |
14 |
13 |
73 |
64 |
67 |
75 |
0 |
| CDI |
0 |
4 |
6 |
68 |
164 |
318 |
453 |
14 |
| VCDI |
0 |
0 |
0 |
12 |
380 |
875 |
13175 |
15666 |
|
...date precedes bulletin
|
Date: 2025-04-29:
| 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 |
169 |
2 |
4 |
4 |
0 |
0 |
0 |
| OW |
0 |
197 |
21 |
7 |
12 |
7 |
2 |
0 |
| VODI |
0 |
49 |
24 |
114 |
46 |
6 |
5 |
10 |
| ODI |
0 |
2 |
4 |
72 |
106 |
59 |
15 |
14 |
| CDI |
0 |
3 |
2 |
60 |
208 |
539 |
285 |
82 |
| VCDI |
0 |
0 |
0 |
25 |
405 |
1182 |
12618 |
15722 |
|
...date precedes bulletin
|
Date: 2025-05-01:
| 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 |
204 |
8 |
4 |
0 |
0 |
0 |
0 |
| OW |
0 |
167 |
23 |
31 |
21 |
6 |
2 |
14 |
| VODI |
0 |
26 |
41 |
121 |
58 |
6 |
10 |
34 |
| ODI |
0 |
13 |
15 |
73 |
95 |
74 |
27 |
44 |
| CDI |
0 |
5 |
15 |
113 |
230 |
384 |
322 |
89 |
| VCDI |
0 |
5 |
14 |
158 |
678 |
2007 |
13089 |
13856 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
231 |
8 |
6 |
1 |
0 |
0 |
0 |
| OW |
0 |
140 |
23 |
22 |
20 |
5 |
2 |
14 |
| VODI |
0 |
28 |
40 |
126 |
46 |
6 |
16 |
26 |
| ODI |
0 |
12 |
17 |
87 |
114 |
80 |
30 |
37 |
| CDI |
0 |
6 |
16 |
108 |
223 |
411 |
354 |
99 |
| VCDI |
0 |
3 |
12 |
151 |
678 |
1975 |
13048 |
13861 |
|
Date: 2025-05-03:
| 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 |
242 |
2 |
3 |
1 |
0 |
0 |
0 |
| OW |
0 |
219 |
10 |
26 |
43 |
8 |
1 |
0 |
| VODI |
0 |
146 |
29 |
79 |
75 |
7 |
8 |
78 |
| ODI |
0 |
56 |
46 |
98 |
93 |
32 |
28 |
50 |
| CDI |
0 |
25 |
22 |
161 |
465 |
447 |
186 |
91 |
| VCDI |
0 |
2 |
15 |
74 |
652 |
3427 |
11052 |
14083 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
262 |
3 |
4 |
8 |
0 |
0 |
0 |
| OW |
0 |
197 |
5 |
18 |
37 |
8 |
2 |
8 |
| VODI |
0 |
160 |
42 |
82 |
73 |
7 |
8 |
64 |
| ODI |
0 |
58 |
41 |
114 |
94 |
35 |
33 |
43 |
| CDI |
0 |
11 |
19 |
158 |
486 |
484 |
230 |
105 |
| VCDI |
0 |
2 |
14 |
65 |
631 |
3387 |
11002 |
14082 |
|
Date: 2025-05-05:
| 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 |
369 |
9 |
7 |
0 |
0 |
0 |
0 |
| OW |
0 |
361 |
38 |
42 |
6 |
4 |
0 |
0 |
| VODI |
0 |
116 |
68 |
94 |
91 |
19 |
4 |
2 |
| ODI |
0 |
21 |
25 |
189 |
282 |
60 |
20 |
16 |
| CDI |
0 |
13 |
14 |
129 |
899 |
1473 |
417 |
43 |
| VCDI |
0 |
11 |
5 |
66 |
324 |
2152 |
10019 |
14674 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
262 |
7 |
1 |
3 |
2 |
1 |
0 |
| OW |
0 |
266 |
6 |
19 |
25 |
8 |
1 |
8 |
| VODI |
0 |
224 |
42 |
56 |
73 |
16 |
12 |
62 |
| ODI |
0 |
93 |
57 |
120 |
95 |
27 |
35 |
54 |
| CDI |
0 |
28 |
39 |
207 |
669 |
502 |
390 |
126 |
| VCDI |
0 |
18 |
8 |
124 |
737 |
3153 |
10021 |
14485 |
|
Date: 2025-05-07:
| 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 |
440 |
3 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
352 |
24 |
17 |
7 |
5 |
1 |
5 |
| VODI |
0 |
130 |
75 |
161 |
79 |
3 |
12 |
16 |
| ODI |
0 |
25 |
32 |
226 |
174 |
43 |
23 |
40 |
| CDI |
0 |
47 |
50 |
219 |
885 |
1208 |
338 |
149 |
| VCDI |
0 |
7 |
3 |
111 |
579 |
2227 |
9720 |
14646 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
186 |
0 |
1 |
4 |
1 |
0 |
3 |
| OW |
0 |
295 |
15 |
20 |
13 |
5 |
1 |
35 |
| VODI |
0 |
272 |
24 |
113 |
53 |
7 |
17 |
68 |
| ODI |
0 |
141 |
52 |
128 |
99 |
38 |
35 |
74 |
| CDI |
0 |
89 |
87 |
304 |
632 |
480 |
531 |
90 |
| VCDI |
0 |
18 |
9 |
168 |
923 |
2955 |
9510 |
14586 |
|
Date: 2025-05-09:
| 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 |
403 |
4 |
7 |
3 |
0 |
0 |
3 |
| OW |
8 |
337 |
21 |
48 |
12 |
5 |
4 |
18 |
| VODI |
10 |
165 |
121 |
168 |
74 |
5 |
18 |
46 |
| ODI |
0 |
62 |
58 |
185 |
139 |
29 |
36 |
92 |
| CDI |
0 |
115 |
83 |
360 |
685 |
785 |
518 |
97 |
| VCDI |
0 |
25 |
44 |
161 |
573 |
2631 |
11498 |
12426 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
221 |
0 |
1 |
3 |
2 |
0 |
29 |
| OW |
7 |
286 |
20 |
29 |
11 |
4 |
4 |
65 |
| VODI |
11 |
235 |
70 |
123 |
47 |
3 |
32 |
72 |
| ODI |
0 |
176 |
70 |
137 |
80 |
23 |
65 |
60 |
| CDI |
0 |
140 |
104 |
398 |
596 |
536 |
804 |
48 |
| VCDI |
0 |
49 |
67 |
241 |
749 |
2887 |
11169 |
12408 |
|
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