Validation of sea ice concentration - Asian sector
Bulletin date: 2025-05-01
Data source: OSI SAF N.H. multi-product 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 |
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 |
|
...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 |
150 |
114 |
8 |
27 |
1 |
0 |
0 |
0 |
| OW |
0 |
134 |
20 |
17 |
25 |
2 |
7 |
0 |
| VODI |
0 |
60 |
28 |
91 |
66 |
7 |
42 |
0 |
| ODI |
0 |
0 |
0 |
47 |
153 |
71 |
67 |
0 |
| CDI |
0 |
0 |
0 |
3 |
256 |
408 |
434 |
22 |
| VCDI |
0 |
0 |
0 |
0 |
408 |
1052 |
11989 |
17387 |
|
...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 |
139 |
168 |
12 |
9 |
2 |
0 |
0 |
0 |
| OW |
0 |
141 |
48 |
43 |
10 |
2 |
0 |
0 |
| VODI |
0 |
28 |
1 |
109 |
109 |
5 |
16 |
0 |
| ODI |
0 |
0 |
0 |
8 |
225 |
35 |
38 |
0 |
| CDI |
0 |
0 |
0 |
1 |
260 |
753 |
261 |
3 |
| VCDI |
0 |
0 |
0 |
0 |
349 |
1468 |
13060 |
15793 |
|
...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 |
121 |
209 |
18 |
20 |
0 |
0 |
0 |
0 |
| OW |
0 |
136 |
17 |
63 |
32 |
2 |
19 |
0 |
| VODI |
0 |
6 |
1 |
145 |
111 |
3 |
53 |
0 |
| ODI |
0 |
0 |
0 |
47 |
197 |
60 |
79 |
1 |
| CDI |
0 |
0 |
0 |
32 |
304 |
567 |
364 |
6 |
| VCDI |
0 |
0 |
0 |
34 |
729 |
2609 |
11941 |
15170 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
121 |
231 |
19 |
27 |
0 |
0 |
0 |
0 |
| OW |
0 |
117 |
16 |
47 |
31 |
2 |
19 |
0 |
| VODI |
0 |
3 |
1 |
148 |
106 |
5 |
50 |
0 |
| ODI |
0 |
0 |
0 |
53 |
227 |
59 |
80 |
1 |
| CDI |
0 |
0 |
0 |
41 |
286 |
586 |
409 |
10 |
| VCDI |
0 |
0 |
0 |
25 |
723 |
2589 |
11898 |
15166 |
|
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 |
137 |
250 |
8 |
5 |
1 |
0 |
0 |
0 |
| OW |
0 |
200 |
24 |
38 |
49 |
4 |
0 |
3 |
| VODI |
0 |
45 |
57 |
177 |
72 |
15 |
7 |
85 |
| ODI |
0 |
2 |
4 |
171 |
131 |
57 |
32 |
55 |
| CDI |
0 |
0 |
0 |
81 |
625 |
557 |
178 |
81 |
| VCDI |
0 |
0 |
0 |
6 |
698 |
4393 |
9485 |
15363 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
137 |
267 |
11 |
7 |
7 |
1 |
0 |
0 |
| OW |
0 |
175 |
19 |
34 |
41 |
3 |
0 |
12 |
| VODI |
0 |
54 |
59 |
197 |
71 |
16 |
8 |
70 |
| ODI |
0 |
1 |
4 |
182 |
131 |
57 |
34 |
49 |
| CDI |
0 |
0 |
0 |
58 |
670 |
589 |
220 |
99 |
| VCDI |
0 |
0 |
0 |
0 |
656 |
4360 |
9440 |
15357 |
|
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 |
150 |
381 |
6 |
3 |
0 |
0 |
0 |
0 |
| OW |
0 |
342 |
80 |
47 |
8 |
2 |
0 |
0 |
| VODI |
0 |
8 |
18 |
257 |
123 |
20 |
0 |
7 |
| ODI |
0 |
0 |
2 |
113 |
440 |
60 |
18 |
24 |
| CDI |
0 |
0 |
0 |
32 |
1043 |
1910 |
162 |
41 |
| VCDI |
0 |
0 |
0 |
23 |
312 |
2693 |
9483 |
15288 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
150 |
261 |
5 |
5 |
0 |
5 |
0 |
0 |
| OW |
0 |
282 |
14 |
16 |
29 |
4 |
0 |
11 |
| VODI |
0 |
181 |
61 |
77 |
104 |
19 |
9 |
75 |
| ODI |
0 |
7 |
26 |
187 |
173 |
50 |
37 |
59 |
| CDI |
0 |
0 |
0 |
154 |
889 |
642 |
351 |
115 |
| VCDI |
0 |
0 |
0 |
36 |
731 |
3965 |
9266 |
15100 |
|
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 |
150 |
444 |
5 |
3 |
0 |
0 |
0 |
0 |
| OW |
4 |
296 |
58 |
46 |
12 |
0 |
0 |
7 |
| VODI |
6 |
51 |
40 |
227 |
177 |
11 |
7 |
24 |
| ODI |
0 |
9 |
10 |
163 |
350 |
46 |
23 |
50 |
| CDI |
0 |
0 |
0 |
154 |
1135 |
1374 |
245 |
144 |
| VCDI |
0 |
0 |
0 |
35 |
563 |
2845 |
9146 |
15236 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
150 |
187 |
0 |
0 |
5 |
0 |
0 |
5 |
| OW |
4 |
308 |
11 |
16 |
22 |
0 |
0 |
43 |
| VODI |
6 |
223 |
42 |
104 |
136 |
7 |
18 |
79 |
| ODI |
0 |
63 |
44 |
170 |
186 |
47 |
36 |
74 |
| CDI |
0 |
19 |
16 |
273 |
999 |
525 |
510 |
77 |
| VCDI |
0 |
0 |
0 |
65 |
889 |
3697 |
8857 |
15183 |
|
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 |
151 |
405 |
0 |
16 |
3 |
0 |
0 |
5 |
| OW |
31 |
236 |
43 |
124 |
33 |
3 |
2 |
22 |
| VODI |
11 |
38 |
33 |
350 |
136 |
11 |
16 |
57 |
| ODI |
0 |
9 |
7 |
216 |
271 |
25 |
40 |
94 |
| CDI |
0 |
5 |
10 |
276 |
1095 |
887 |
464 |
82 |
| VCDI |
0 |
0 |
0 |
128 |
656 |
3048 |
8890 |
15167 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
150 |
227 |
1 |
0 |
3 |
0 |
0 |
36 |
| OW |
29 |
248 |
12 |
59 |
20 |
2 |
3 |
70 |
| VODI |
14 |
132 |
27 |
277 |
72 |
7 |
36 |
75 |
| ODI |
0 |
61 |
28 |
242 |
176 |
25 |
81 |
50 |
| CDI |
0 |
25 |
25 |
369 |
965 |
691 |
759 |
40 |
| VCDI |
0 |
0 |
0 |
163 |
958 |
3249 |
8533 |
15156 |
|
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