Validation of sea ice concentration - Asian sector
Bulletin date: 2025-03-27
Data source: OSI SAF N.H. AMSR sea ice concentration
Model vs. observations, sea ice class contingency tables
Date: 2025-03-21:
| 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 |
158 |
13 |
13 |
2 |
0 |
0 |
0 |
| OW |
0 |
82 |
7 |
14 |
10 |
0 |
0 |
0 |
| VODI |
0 |
44 |
7 |
22 |
23 |
2 |
0 |
0 |
| ODI |
0 |
26 |
8 |
16 |
25 |
36 |
4 |
2 |
| CDI |
0 |
8 |
10 |
30 |
51 |
157 |
136 |
5 |
| VCDI |
0 |
4 |
6 |
23 |
76 |
689 |
12673 |
17700 |
|
...date precedes bulletin
|
Date: 2025-03-23:
| 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 |
138 |
5 |
6 |
1 |
0 |
0 |
0 |
| OW |
0 |
81 |
5 |
20 |
3 |
0 |
0 |
0 |
| VODI |
0 |
55 |
9 |
16 |
32 |
2 |
0 |
0 |
| ODI |
0 |
23 |
17 |
13 |
17 |
22 |
19 |
0 |
| CDI |
0 |
13 |
15 |
40 |
43 |
85 |
116 |
0 |
| VCDI |
0 |
8 |
13 |
35 |
62 |
423 |
10540 |
20205 |
|
...date precedes bulletin
|
Date: 2025-03-25:
| 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 |
233 |
3 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
143 |
12 |
10 |
0 |
0 |
0 |
0 |
| VODI |
0 |
102 |
17 |
32 |
11 |
1 |
0 |
0 |
| ODI |
0 |
38 |
4 |
19 |
9 |
9 |
1 |
0 |
| CDI |
0 |
36 |
15 |
25 |
53 |
44 |
15 |
0 |
| VCDI |
0 |
25 |
25 |
74 |
136 |
606 |
11681 |
18703 |
|
...date precedes bulletin
|
Date: 2025-03-27:
| 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 |
247 |
0 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
179 |
6 |
2 |
0 |
0 |
0 |
0 |
| VODI |
0 |
182 |
20 |
20 |
5 |
0 |
0 |
0 |
| ODI |
0 |
80 |
26 |
34 |
21 |
6 |
0 |
0 |
| CDI |
0 |
65 |
24 |
57 |
67 |
53 |
50 |
4 |
| VCDI |
0 |
88 |
40 |
97 |
207 |
986 |
9503 |
20013 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
241 |
0 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
181 |
4 |
3 |
0 |
0 |
0 |
0 |
| VODI |
0 |
189 |
22 |
19 |
6 |
0 |
0 |
0 |
| ODI |
0 |
84 |
26 |
31 |
15 |
6 |
0 |
0 |
| CDI |
0 |
67 |
24 |
62 |
77 |
67 |
54 |
14 |
| VCDI |
0 |
79 |
40 |
95 |
202 |
972 |
9499 |
20003 |
|
Date: 2025-03-29:
| 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 |
2 |
251 |
0 |
0 |
0 |
0 |
0 |
0 |
| OW |
12 |
239 |
1 |
2 |
0 |
0 |
0 |
0 |
| VODI |
6 |
209 |
16 |
18 |
8 |
2 |
0 |
0 |
| ODI |
0 |
108 |
18 |
31 |
12 |
13 |
17 |
0 |
| CDI |
0 |
89 |
33 |
70 |
93 |
157 |
32 |
7 |
| VCDI |
0 |
90 |
45 |
105 |
173 |
1560 |
9962 |
18701 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
1 |
251 |
0 |
0 |
0 |
0 |
0 |
0 |
| OW |
10 |
243 |
1 |
2 |
0 |
0 |
0 |
0 |
| VODI |
9 |
202 |
15 |
21 |
7 |
2 |
0 |
0 |
| ODI |
0 |
113 |
24 |
27 |
13 |
15 |
16 |
0 |
| CDI |
0 |
108 |
33 |
75 |
94 |
176 |
41 |
8 |
| VCDI |
0 |
69 |
40 |
101 |
172 |
1539 |
9954 |
18700 |
|
Date: 2025-03-31:
| 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 |
309 |
0 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
270 |
3 |
4 |
1 |
0 |
0 |
0 |
| VODI |
0 |
168 |
18 |
19 |
18 |
1 |
0 |
0 |
| ODI |
0 |
57 |
31 |
47 |
25 |
15 |
5 |
0 |
| CDI |
0 |
19 |
21 |
150 |
174 |
342 |
127 |
0 |
| VCDI |
0 |
0 |
0 |
29 |
125 |
1713 |
10439 |
17952 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
218 |
0 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
186 |
2 |
0 |
0 |
0 |
0 |
0 |
| VODI |
0 |
204 |
11 |
14 |
8 |
1 |
0 |
0 |
| ODI |
0 |
126 |
25 |
33 |
27 |
18 |
10 |
0 |
| CDI |
0 |
83 |
32 |
148 |
153 |
335 |
162 |
0 |
| VCDI |
0 |
6 |
3 |
54 |
155 |
1717 |
10399 |
17952 |
|
Date: 2025-04-02:
| 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 |
294 |
0 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
165 |
7 |
5 |
5 |
6 |
0 |
0 |
| VODI |
0 |
117 |
11 |
21 |
36 |
43 |
0 |
0 |
| ODI |
0 |
54 |
20 |
24 |
23 |
32 |
1 |
2 |
| CDI |
0 |
15 |
20 |
75 |
134 |
260 |
108 |
7 |
| VCDI |
0 |
0 |
0 |
15 |
50 |
740 |
8966 |
20826 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
161 |
0 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
125 |
3 |
1 |
1 |
0 |
0 |
0 |
| VODI |
0 |
148 |
5 |
8 |
15 |
28 |
0 |
0 |
| ODI |
0 |
126 |
14 |
21 |
27 |
38 |
16 |
4 |
| CDI |
0 |
85 |
36 |
86 |
117 |
276 |
112 |
34 |
| VCDI |
0 |
0 |
0 |
24 |
88 |
739 |
8947 |
20797 |
|
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 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
120 |
3 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
109 |
1 |
5 |
0 |
0 |
0 |
0 |
| VODI |
0 |
114 |
7 |
3 |
6 |
1 |
2 |
0 |
| ODI |
0 |
130 |
7 |
23 |
26 |
19 |
18 |
5 |
| CDI |
0 |
164 |
41 |
80 |
146 |
126 |
69 |
15 |
| VCDI |
0 |
50 |
22 |
68 |
206 |
822 |
8092 |
21582 |
|
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