Validation of sea ice concentration - Asian sector
Bulletin date: 2025-05-22
Data source: OSI SAF N.H. AMSR sea ice concentration
Model vs. observations, sea ice class contingency tables
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 |
16 |
613 |
13 |
10 |
0 |
0 |
0 |
17 |
| OW |
0 |
473 |
51 |
49 |
17 |
2 |
5 |
31 |
| VODI |
0 |
411 |
114 |
156 |
68 |
4 |
37 |
59 |
| ODI |
0 |
205 |
86 |
290 |
257 |
25 |
185 |
48 |
| CDI |
0 |
92 |
87 |
496 |
841 |
1978 |
965 |
31 |
| VCDI |
0 |
17 |
16 |
48 |
286 |
2365 |
16929 |
4689 |
|
...date precedes bulletin
|
Date: 2025-05-18:
| 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 |
12 |
551 |
2 |
3 |
0 |
0 |
0 |
16 |
| OW |
0 |
444 |
34 |
46 |
22 |
4 |
2 |
27 |
| VODI |
0 |
435 |
115 |
138 |
28 |
1 |
11 |
74 |
| ODI |
0 |
243 |
113 |
314 |
283 |
44 |
183 |
99 |
| CDI |
0 |
163 |
139 |
485 |
728 |
2635 |
1404 |
165 |
| VCDI |
0 |
20 |
16 |
63 |
259 |
2616 |
16559 |
3586 |
|
...date precedes bulletin
|
Date: 2025-05-20:
| 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 |
8 |
638 |
3 |
7 |
5 |
0 |
1 |
11 |
| OW |
0 |
812 |
68 |
48 |
16 |
5 |
2 |
10 |
| VODI |
0 |
436 |
228 |
390 |
117 |
5 |
12 |
41 |
| ODI |
0 |
78 |
84 |
346 |
501 |
172 |
53 |
71 |
| CDI |
0 |
40 |
36 |
222 |
819 |
3225 |
927 |
84 |
| VCDI |
0 |
1 |
14 |
29 |
132 |
3620 |
15440 |
3325 |
|
...date precedes bulletin
|
Date: 2025-05-22:
| 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 |
24 |
577 |
11 |
15 |
4 |
0 |
1 |
0 |
| OW |
0 |
771 |
79 |
47 |
13 |
3 |
0 |
13 |
| VODI |
0 |
479 |
218 |
363 |
149 |
14 |
43 |
50 |
| ODI |
0 |
109 |
123 |
368 |
557 |
193 |
99 |
76 |
| CDI |
0 |
45 |
43 |
222 |
926 |
3392 |
1877 |
383 |
| VCDI |
0 |
2 |
2 |
14 |
86 |
3529 |
14304 |
2858 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
24 |
609 |
8 |
16 |
4 |
0 |
1 |
6 |
| OW |
0 |
763 |
83 |
52 |
13 |
2 |
0 |
16 |
| VODI |
0 |
457 |
219 |
366 |
156 |
12 |
38 |
50 |
| ODI |
0 |
109 |
115 |
343 |
568 |
202 |
120 |
72 |
| CDI |
0 |
43 |
49 |
235 |
900 |
3438 |
1967 |
268 |
| VCDI |
0 |
2 |
2 |
17 |
94 |
3477 |
14198 |
2968 |
|
Date: 2025-05-24:
| 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 |
592 |
8 |
9 |
1 |
0 |
0 |
0 |
| OW |
0 |
750 |
55 |
40 |
10 |
4 |
10 |
5 |
| VODI |
0 |
534 |
183 |
380 |
175 |
20 |
90 |
9 |
| ODI |
0 |
129 |
104 |
401 |
775 |
253 |
204 |
7 |
| CDI |
0 |
46 |
57 |
235 |
1033 |
4166 |
1974 |
49 |
| VCDI |
0 |
0 |
0 |
10 |
222 |
3241 |
14467 |
1834 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
639 |
9 |
8 |
2 |
0 |
1 |
0 |
| OW |
0 |
720 |
55 |
46 |
11 |
7 |
15 |
8 |
| VODI |
0 |
528 |
190 |
381 |
181 |
20 |
100 |
4 |
| ODI |
0 |
119 |
95 |
372 |
744 |
259 |
218 |
15 |
| CDI |
0 |
45 |
58 |
260 |
1041 |
4224 |
2037 |
46 |
| VCDI |
0 |
0 |
0 |
8 |
237 |
3174 |
14374 |
1831 |
|
Date: 2025-05-26:
| 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 |
569 |
8 |
14 |
3 |
0 |
1 |
0 |
| OW |
0 |
689 |
91 |
83 |
18 |
10 |
19 |
2 |
| VODI |
0 |
452 |
167 |
351 |
217 |
36 |
105 |
3 |
| ODI |
0 |
141 |
121 |
350 |
724 |
469 |
265 |
14 |
| CDI |
0 |
47 |
50 |
249 |
1125 |
4809 |
3004 |
84 |
| VCDI |
0 |
0 |
2 |
47 |
143 |
2158 |
11789 |
3653 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
575 |
6 |
12 |
1 |
0 |
1 |
0 |
| OW |
0 |
544 |
85 |
82 |
35 |
8 |
7 |
1 |
| VODI |
0 |
547 |
182 |
371 |
233 |
66 |
112 |
5 |
| ODI |
0 |
181 |
115 |
355 |
725 |
428 |
322 |
17 |
| CDI |
0 |
51 |
49 |
231 |
1058 |
4428 |
3264 |
84 |
| VCDI |
0 |
0 |
2 |
43 |
178 |
2552 |
11477 |
3649 |
|
Date: 2025-05-28:
| 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 |
5 |
816 |
10 |
6 |
3 |
0 |
1 |
0 |
| OW |
0 |
925 |
90 |
50 |
12 |
3 |
1 |
0 |
| VODI |
0 |
425 |
235 |
388 |
152 |
12 |
11 |
0 |
| ODI |
0 |
65 |
70 |
386 |
923 |
217 |
32 |
0 |
| CDI |
0 |
29 |
40 |
169 |
1115 |
4776 |
1216 |
0 |
| VCDI |
0 |
0 |
1 |
34 |
129 |
2021 |
12176 |
5538 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
5 |
672 |
2 |
1 |
1 |
0 |
1 |
0 |
| OW |
0 |
634 |
114 |
90 |
24 |
2 |
2 |
0 |
| VODI |
0 |
627 |
185 |
343 |
231 |
71 |
44 |
0 |
| ODI |
0 |
235 |
77 |
319 |
800 |
489 |
252 |
0 |
| CDI |
0 |
91 |
64 |
224 |
1069 |
4718 |
2743 |
0 |
| VCDI |
0 |
1 |
4 |
56 |
209 |
1749 |
10395 |
5538 |
|
Date: 2025-05-30:
| Best estimate |
Forecast |
|
...observations not yet available
|
...observations not yet available
|
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