Validation of sea ice concentration - Asian sector
Bulletin date: 2025-05-08
Data source: OSI SAF N.H. multi-product sea ice concentration
Model vs. observations, sea ice class contingency tables
Date: 2025-05-02:
| 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 |
125 |
218 |
18 |
18 |
2 |
0 |
0 |
0 |
| OW |
0 |
172 |
24 |
49 |
28 |
1 |
0 |
24 |
| VODI |
0 |
9 |
23 |
164 |
84 |
11 |
10 |
60 |
| ODI |
0 |
0 |
0 |
93 |
199 |
44 |
27 |
50 |
| CDI |
0 |
0 |
0 |
59 |
475 |
616 |
253 |
67 |
| VCDI |
0 |
0 |
0 |
38 |
750 |
2981 |
11271 |
15133 |
|
...date precedes bulletin
|
Date: 2025-05-04:
| 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 |
146 |
241 |
6 |
3 |
2 |
1 |
0 |
0 |
| OW |
0 |
265 |
16 |
23 |
36 |
13 |
0 |
4 |
| VODI |
0 |
131 |
73 |
84 |
109 |
20 |
6 |
80 |
| ODI |
0 |
6 |
18 |
163 |
169 |
51 |
35 |
60 |
| CDI |
0 |
0 |
5 |
107 |
693 |
618 |
249 |
108 |
| VCDI |
0 |
0 |
0 |
31 |
528 |
4378 |
9692 |
14926 |
|
...date precedes bulletin
|
Date: 2025-05-06:
| 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 |
150 |
420 |
3 |
2 |
0 |
0 |
0 |
0 |
| OW |
0 |
324 |
73 |
48 |
15 |
0 |
0 |
1 |
| VODI |
0 |
31 |
34 |
221 |
143 |
13 |
2 |
14 |
| ODI |
0 |
0 |
5 |
156 |
343 |
58 |
22 |
33 |
| CDI |
0 |
0 |
0 |
98 |
1150 |
1609 |
283 |
119 |
| VCDI |
0 |
0 |
0 |
11 |
425 |
2392 |
9763 |
15135 |
|
...date precedes bulletin
|
Date: 2025-05-08:
| 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 |
151 |
436 |
3 |
4 |
2 |
0 |
0 |
0 |
| OW |
31 |
234 |
52 |
81 |
35 |
0 |
1 |
14 |
| VODI |
14 |
38 |
30 |
286 |
204 |
9 |
11 |
37 |
| ODI |
0 |
15 |
8 |
190 |
329 |
36 |
24 |
66 |
| CDI |
0 |
0 |
1 |
168 |
1188 |
960 |
347 |
148 |
| VCDI |
0 |
0 |
0 |
76 |
656 |
2907 |
8685 |
15619 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
153 |
432 |
5 |
6 |
6 |
0 |
0 |
0 |
| OW |
28 |
248 |
50 |
86 |
50 |
1 |
2 |
19 |
| VODI |
15 |
28 |
31 |
290 |
204 |
9 |
10 |
37 |
| ODI |
0 |
15 |
7 |
179 |
309 |
28 |
25 |
105 |
| CDI |
0 |
0 |
1 |
159 |
1201 |
1033 |
333 |
104 |
| VCDI |
0 |
0 |
0 |
85 |
644 |
2841 |
8698 |
15619 |
|
Date: 2025-05-10:
| 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 |
151 |
385 |
0 |
20 |
3 |
0 |
0 |
14 |
| OW |
34 |
216 |
39 |
92 |
52 |
5 |
4 |
33 |
| VODI |
3 |
37 |
48 |
327 |
151 |
12 |
28 |
79 |
| ODI |
0 |
22 |
24 |
197 |
251 |
38 |
76 |
79 |
| CDI |
0 |
100 |
89 |
238 |
875 |
1064 |
608 |
57 |
| VCDI |
0 |
9 |
22 |
212 |
672 |
2790 |
8758 |
15182 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
155 |
386 |
4 |
22 |
11 |
0 |
0 |
23 |
| OW |
30 |
218 |
32 |
96 |
58 |
5 |
8 |
37 |
| VODI |
3 |
32 |
55 |
336 |
145 |
12 |
25 |
72 |
| ODI |
0 |
21 |
22 |
175 |
262 |
37 |
78 |
73 |
| CDI |
0 |
96 |
75 |
223 |
827 |
1269 |
518 |
61 |
| VCDI |
0 |
16 |
34 |
234 |
701 |
2586 |
8845 |
15178 |
|
Date: 2025-05-12:
| 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 |
172 |
477 |
5 |
10 |
3 |
0 |
0 |
5 |
| OW |
20 |
268 |
135 |
113 |
22 |
5 |
3 |
19 |
| VODI |
0 |
47 |
56 |
637 |
175 |
12 |
13 |
39 |
| ODI |
0 |
8 |
10 |
252 |
634 |
54 |
23 |
75 |
| CDI |
0 |
0 |
0 |
81 |
889 |
2081 |
435 |
90 |
| VCDI |
0 |
0 |
0 |
43 |
201 |
1487 |
9328 |
15169 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
168 |
396 |
7 |
21 |
4 |
2 |
1 |
76 |
| OW |
24 |
187 |
30 |
80 |
38 |
3 |
7 |
50 |
| VODI |
0 |
82 |
77 |
279 |
147 |
18 |
66 |
48 |
| ODI |
0 |
31 |
27 |
183 |
280 |
71 |
134 |
59 |
| CDI |
0 |
104 |
56 |
341 |
934 |
1294 |
845 |
68 |
| VCDI |
0 |
0 |
9 |
232 |
521 |
2251 |
8749 |
15096 |
|
Date: 2025-05-14:
| 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 |
155 |
565 |
7 |
26 |
0 |
0 |
1 |
10 |
| OW |
0 |
282 |
115 |
168 |
17 |
5 |
0 |
31 |
| VODI |
0 |
91 |
88 |
523 |
121 |
20 |
13 |
77 |
| ODI |
0 |
17 |
30 |
301 |
444 |
77 |
100 |
57 |
| CDI |
0 |
0 |
2 |
200 |
1125 |
2241 |
960 |
138 |
| VCDI |
0 |
0 |
0 |
26 |
227 |
2544 |
13649 |
8643 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
155 |
503 |
7 |
19 |
0 |
1 |
1 |
94 |
| OW |
0 |
174 |
35 |
97 |
17 |
5 |
5 |
46 |
| VODI |
0 |
122 |
67 |
249 |
119 |
20 |
86 |
50 |
| ODI |
0 |
21 |
35 |
275 |
345 |
86 |
206 |
39 |
| CDI |
0 |
135 |
76 |
380 |
1039 |
1901 |
920 |
43 |
| VCDI |
0 |
0 |
22 |
224 |
414 |
2874 |
13505 |
8684 |
|
Date: 2025-05-16:
| 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 |
167 |
618 |
10 |
26 |
0 |
0 |
0 |
19 |
| OW |
0 |
370 |
81 |
160 |
11 |
2 |
4 |
41 |
| VODI |
0 |
194 |
126 |
394 |
68 |
6 |
41 |
75 |
| ODI |
0 |
84 |
60 |
414 |
325 |
41 |
168 |
71 |
| CDI |
0 |
3 |
18 |
410 |
1318 |
2138 |
697 |
138 |
| VCDI |
0 |
0 |
0 |
27 |
308 |
2203 |
13349 |
8911 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
167 |
619 |
3 |
6 |
0 |
0 |
0 |
113 |
| OW |
0 |
189 |
41 |
117 |
2 |
1 |
19 |
38 |
| VODI |
0 |
203 |
90 |
204 |
92 |
10 |
99 |
49 |
| ODI |
0 |
36 |
48 |
373 |
331 |
41 |
268 |
43 |
| CDI |
0 |
156 |
58 |
462 |
1148 |
2050 |
859 |
87 |
| VCDI |
0 |
66 |
55 |
269 |
457 |
2288 |
13014 |
8925 |
|
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