Validation of sea ice concentration - Asian sector
Bulletin date: 2025-05-15
Data source: OSI SAF N.H. AMSR sea ice concentration
Model vs. observations, sea ice class contingency tables
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 |
0 |
403 |
4 |
7 |
3 |
0 |
0 |
3 |
| OW |
8 |
337 |
21 |
48 |
12 |
5 |
4 |
18 |
| VODI |
10 |
165 |
121 |
168 |
74 |
5 |
18 |
46 |
| ODI |
0 |
62 |
58 |
185 |
139 |
29 |
36 |
92 |
| CDI |
0 |
115 |
83 |
360 |
685 |
785 |
518 |
97 |
| VCDI |
0 |
25 |
44 |
161 |
573 |
2631 |
11498 |
12426 |
|
...date precedes bulletin
|
Date: 2025-05-11:
| 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 |
374 |
5 |
15 |
1 |
1 |
0 |
22 |
| OW |
15 |
268 |
23 |
47 |
16 |
3 |
8 |
45 |
| VODI |
0 |
193 |
79 |
163 |
84 |
7 |
34 |
82 |
| ODI |
0 |
101 |
40 |
174 |
169 |
34 |
102 |
77 |
| CDI |
0 |
174 |
105 |
381 |
629 |
1109 |
808 |
49 |
| VCDI |
0 |
63 |
58 |
221 |
415 |
2107 |
11247 |
12534 |
|
...date precedes bulletin
|
Date: 2025-05-13:
| 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 |
48 |
494 |
2 |
15 |
1 |
0 |
1 |
4 |
| OW |
8 |
434 |
43 |
53 |
21 |
6 |
3 |
22 |
| VODI |
0 |
244 |
147 |
339 |
96 |
2 |
15 |
59 |
| ODI |
0 |
78 |
57 |
255 |
360 |
56 |
55 |
78 |
| CDI |
0 |
33 |
36 |
195 |
809 |
2020 |
680 |
108 |
| VCDI |
0 |
27 |
9 |
34 |
167 |
3119 |
12312 |
9537 |
|
...date precedes bulletin
|
Date: 2025-05-15:
| 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 |
15 |
576 |
11 |
7 |
1 |
0 |
14 |
0 |
| OW |
0 |
449 |
61 |
61 |
16 |
4 |
32 |
0 |
| VODI |
0 |
349 |
130 |
201 |
86 |
7 |
90 |
0 |
| ODI |
0 |
174 |
56 |
277 |
261 |
42 |
206 |
4 |
| CDI |
0 |
79 |
69 |
381 |
922 |
2037 |
1017 |
86 |
| VCDI |
0 |
11 |
13 |
41 |
245 |
2498 |
16909 |
4644 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
15 |
588 |
14 |
9 |
2 |
0 |
24 |
0 |
| OW |
0 |
424 |
71 |
85 |
20 |
6 |
27 |
0 |
| VODI |
0 |
382 |
114 |
193 |
96 |
7 |
76 |
0 |
| ODI |
0 |
157 |
68 |
272 |
263 |
55 |
196 |
4 |
| CDI |
0 |
75 |
59 |
365 |
881 |
2072 |
1017 |
89 |
| VCDI |
0 |
12 |
14 |
44 |
269 |
2448 |
16928 |
4641 |
|
Date: 2025-05-17:
| 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 |
17 |
597 |
9 |
8 |
0 |
0 |
0 |
13 |
| OW |
0 |
467 |
43 |
53 |
16 |
3 |
2 |
28 |
| VODI |
0 |
451 |
88 |
152 |
37 |
3 |
26 |
76 |
| ODI |
0 |
215 |
107 |
301 |
269 |
28 |
155 |
82 |
| CDI |
0 |
118 |
101 |
486 |
785 |
2152 |
1249 |
138 |
| VCDI |
0 |
22 |
16 |
59 |
278 |
2337 |
15534 |
5561 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
17 |
614 |
9 |
11 |
0 |
0 |
0 |
16 |
| OW |
0 |
468 |
45 |
63 |
18 |
3 |
4 |
28 |
| VODI |
0 |
465 |
90 |
153 |
43 |
3 |
22 |
69 |
| ODI |
0 |
206 |
111 |
296 |
268 |
40 |
138 |
88 |
| CDI |
0 |
95 |
93 |
472 |
749 |
2136 |
1454 |
144 |
| VCDI |
0 |
22 |
16 |
64 |
307 |
2341 |
15348 |
5553 |
|
Date: 2025-05-19:
| 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 |
11 |
647 |
4 |
6 |
3 |
0 |
0 |
10 |
| OW |
0 |
805 |
82 |
55 |
16 |
5 |
3 |
10 |
| VODI |
0 |
372 |
262 |
377 |
88 |
2 |
8 |
26 |
| ODI |
0 |
61 |
70 |
374 |
568 |
156 |
33 |
61 |
| CDI |
0 |
30 |
32 |
188 |
663 |
3237 |
769 |
91 |
| VCDI |
0 |
3 |
5 |
28 |
103 |
2389 |
16925 |
3504 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
11 |
539 |
0 |
6 |
4 |
0 |
0 |
20 |
| OW |
0 |
395 |
49 |
39 |
14 |
5 |
2 |
41 |
| VODI |
0 |
455 |
130 |
143 |
32 |
5 |
21 |
81 |
| ODI |
0 |
295 |
94 |
286 |
321 |
71 |
183 |
84 |
| CDI |
0 |
217 |
164 |
449 |
777 |
2708 |
1992 |
191 |
| VCDI |
0 |
17 |
18 |
105 |
293 |
3000 |
15540 |
3285 |
|
Date: 2025-05-21:
| 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 |
20 |
593 |
7 |
13 |
6 |
0 |
0 |
5 |
| OW |
0 |
773 |
82 |
51 |
14 |
5 |
2 |
11 |
| VODI |
0 |
494 |
202 |
381 |
132 |
10 |
23 |
42 |
| ODI |
0 |
95 |
110 |
349 |
523 |
181 |
76 |
76 |
| CDI |
0 |
48 |
43 |
211 |
903 |
3336 |
1544 |
114 |
| VCDI |
0 |
6 |
5 |
22 |
95 |
3797 |
15552 |
2130 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
20 |
499 |
6 |
11 |
7 |
0 |
1 |
16 |
| OW |
0 |
326 |
44 |
37 |
12 |
5 |
4 |
48 |
| VODI |
0 |
512 |
120 |
171 |
47 |
4 |
67 |
82 |
| ODI |
0 |
346 |
91 |
317 |
391 |
127 |
271 |
96 |
| CDI |
0 |
304 |
173 |
423 |
960 |
2582 |
2692 |
169 |
| VCDI |
0 |
22 |
15 |
68 |
256 |
4611 |
14162 |
1967 |
|
Date: 2025-05-23:
| 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 |
2 |
604 |
8 |
12 |
0 |
0 |
1 |
0 |
| OW |
0 |
783 |
68 |
46 |
12 |
3 |
1 |
10 |
| VODI |
0 |
492 |
206 |
373 |
152 |
15 |
25 |
48 |
| ODI |
0 |
126 |
85 |
372 |
621 |
212 |
114 |
59 |
| CDI |
0 |
48 |
40 |
222 |
931 |
3793 |
2388 |
79 |
| VCDI |
0 |
2 |
1 |
6 |
105 |
3400 |
14546 |
2071 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
2 |
471 |
3 |
15 |
1 |
0 |
1 |
10 |
| OW |
0 |
336 |
35 |
31 |
8 |
2 |
3 |
48 |
| VODI |
0 |
517 |
115 |
193 |
89 |
11 |
101 |
64 |
| ODI |
0 |
410 |
108 |
288 |
414 |
180 |
353 |
47 |
| CDI |
0 |
285 |
130 |
446 |
1041 |
2760 |
3023 |
451 |
| VCDI |
0 |
36 |
17 |
58 |
268 |
4470 |
13594 |
1647 |
|
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