Validation of sea ice concentration - Asian sector
Bulletin date: 2025-04-17
Data source: OSI SAF N.H. multi-product 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 |
263 |
36 |
18 |
0 |
0 |
0 |
0 |
| OW |
0 |
148 |
28 |
66 |
1 |
0 |
0 |
0 |
| VODI |
0 |
88 |
11 |
108 |
10 |
2 |
0 |
0 |
| ODI |
0 |
31 |
14 |
45 |
47 |
12 |
0 |
0 |
| CDI |
0 |
23 |
16 |
79 |
183 |
141 |
2 |
4 |
| VCDI |
0 |
1 |
12 |
81 |
254 |
1453 |
6660 |
23259 |
|
...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 |
245 |
38 |
25 |
0 |
0 |
0 |
0 |
| OW |
0 |
140 |
18 |
93 |
0 |
0 |
0 |
0 |
| VODI |
0 |
69 |
14 |
75 |
28 |
0 |
0 |
0 |
| ODI |
0 |
42 |
7 |
23 |
51 |
20 |
0 |
19 |
| CDI |
0 |
21 |
27 |
46 |
112 |
240 |
39 |
86 |
| VCDI |
0 |
0 |
4 |
81 |
163 |
1091 |
8262 |
22017 |
|
...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 |
322 |
32 |
9 |
0 |
0 |
0 |
0 |
| OW |
0 |
148 |
34 |
84 |
0 |
0 |
0 |
0 |
| VODI |
0 |
43 |
31 |
105 |
11 |
0 |
0 |
0 |
| ODI |
0 |
2 |
6 |
74 |
51 |
9 |
3 |
22 |
| CDI |
0 |
0 |
0 |
61 |
305 |
299 |
115 |
110 |
| VCDI |
0 |
0 |
0 |
0 |
73 |
1216 |
8373 |
21558 |
|
...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 |
340 |
33 |
8 |
0 |
0 |
0 |
0 |
| OW |
0 |
114 |
26 |
59 |
0 |
0 |
0 |
0 |
| VODI |
0 |
43 |
21 |
73 |
4 |
3 |
0 |
0 |
| ODI |
0 |
6 |
12 |
68 |
26 |
39 |
15 |
8 |
| CDI |
0 |
0 |
0 |
29 |
249 |
380 |
231 |
24 |
| VCDI |
0 |
0 |
0 |
0 |
51 |
884 |
10470 |
19880 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
340 |
37 |
14 |
0 |
0 |
0 |
0 |
| OW |
0 |
116 |
23 |
56 |
0 |
0 |
0 |
0 |
| VODI |
0 |
45 |
21 |
71 |
6 |
4 |
1 |
0 |
| ODI |
0 |
2 |
11 |
68 |
24 |
43 |
20 |
8 |
| CDI |
0 |
0 |
0 |
28 |
252 |
363 |
326 |
27 |
| VCDI |
0 |
0 |
0 |
0 |
48 |
896 |
10369 |
19877 |
|
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 |
262 |
30 |
33 |
0 |
0 |
0 |
0 |
| OW |
0 |
73 |
34 |
56 |
3 |
0 |
0 |
0 |
| VODI |
0 |
24 |
14 |
87 |
23 |
5 |
0 |
3 |
| ODI |
0 |
1 |
5 |
55 |
55 |
38 |
11 |
10 |
| CDI |
0 |
0 |
0 |
6 |
150 |
268 |
260 |
95 |
| VCDI |
0 |
0 |
0 |
0 |
43 |
814 |
10386 |
20252 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
268 |
35 |
34 |
0 |
0 |
0 |
0 |
| OW |
0 |
69 |
29 |
65 |
3 |
0 |
0 |
0 |
| VODI |
0 |
22 |
17 |
79 |
25 |
10 |
0 |
1 |
| ODI |
0 |
1 |
2 |
55 |
53 |
34 |
13 |
15 |
| CDI |
0 |
0 |
0 |
4 |
146 |
278 |
288 |
110 |
| VCDI |
0 |
0 |
0 |
0 |
47 |
803 |
10356 |
20234 |
|
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 |
79 |
167 |
21 |
45 |
3 |
0 |
0 |
0 |
| OW |
2 |
51 |
37 |
69 |
22 |
0 |
0 |
0 |
| VODI |
0 |
0 |
6 |
101 |
49 |
32 |
0 |
6 |
| ODI |
0 |
0 |
0 |
19 |
95 |
74 |
8 |
23 |
| CDI |
0 |
0 |
0 |
0 |
109 |
607 |
303 |
97 |
| VCDI |
0 |
0 |
0 |
0 |
1 |
692 |
8625 |
21753 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
81 |
146 |
16 |
47 |
13 |
0 |
0 |
0 |
| OW |
0 |
55 |
25 |
66 |
10 |
0 |
0 |
0 |
| VODI |
0 |
17 |
23 |
76 |
28 |
0 |
0 |
4 |
| ODI |
0 |
0 |
0 |
44 |
66 |
54 |
1 |
10 |
| CDI |
0 |
0 |
0 |
1 |
102 |
330 |
193 |
151 |
| VCDI |
0 |
0 |
0 |
0 |
60 |
1021 |
8742 |
21714 |
|
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 |
69 |
188 |
5 |
45 |
10 |
0 |
0 |
0 |
| OW |
0 |
61 |
24 |
73 |
22 |
2 |
2 |
0 |
| VODI |
0 |
3 |
8 |
80 |
35 |
18 |
9 |
0 |
| ODI |
0 |
0 |
0 |
24 |
89 |
73 |
21 |
10 |
| CDI |
0 |
0 |
0 |
1 |
79 |
527 |
462 |
58 |
| VCDI |
0 |
0 |
0 |
0 |
175 |
935 |
9627 |
20361 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
69 |
162 |
6 |
15 |
19 |
0 |
0 |
0 |
| OW |
0 |
62 |
14 |
62 |
13 |
1 |
7 |
0 |
| VODI |
0 |
28 |
16 |
91 |
8 |
5 |
14 |
1 |
| ODI |
0 |
0 |
1 |
54 |
91 |
42 |
27 |
11 |
| CDI |
0 |
0 |
0 |
1 |
102 |
483 |
423 |
93 |
| VCDI |
0 |
0 |
0 |
0 |
177 |
1024 |
9650 |
20324 |
|
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 |
83 |
207 |
15 |
29 |
3 |
0 |
0 |
0 |
| OW |
0 |
126 |
28 |
19 |
19 |
6 |
4 |
0 |
| VODI |
0 |
38 |
37 |
74 |
31 |
10 |
15 |
0 |
| ODI |
0 |
0 |
3 |
57 |
108 |
63 |
39 |
15 |
| CDI |
0 |
0 |
0 |
5 |
280 |
510 |
197 |
65 |
| VCDI |
0 |
0 |
0 |
0 |
311 |
1067 |
9856 |
19776 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
83 |
149 |
1 |
7 |
5 |
0 |
0 |
0 |
| OW |
0 |
43 |
16 |
27 |
23 |
9 |
10 |
0 |
| VODI |
0 |
106 |
26 |
28 |
27 |
7 |
34 |
4 |
| ODI |
0 |
67 |
28 |
36 |
50 |
37 |
47 |
31 |
| CDI |
0 |
6 |
12 |
86 |
273 |
276 |
249 |
139 |
| VCDI |
0 |
0 |
0 |
0 |
374 |
1327 |
9771 |
19682 |
|
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