Validation of sea ice concentration - Asian sector
Bulletin date: 2025-07-17
Data source: OSI SAF N.H. multi-product sea ice concentration
Model vs. observations, sea ice class contingency tables
Date: 2025-07-11:
| 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 |
2567 |
4392 |
52 |
54 |
10 |
0 |
0 |
0 |
| OW |
38 |
829 |
305 |
468 |
90 |
5 |
0 |
0 |
| VODI |
2 |
218 |
115 |
1392 |
708 |
8 |
0 |
0 |
| ODI |
0 |
21 |
24 |
516 |
1964 |
86 |
0 |
0 |
| CDI |
0 |
0 |
9 |
177 |
4804 |
6330 |
10 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
892 |
6487 |
523 |
0 |
|
...date precedes bulletin
|
Date: 2025-07-13:
| 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 |
2991 |
3883 |
27 |
36 |
11 |
0 |
0 |
0 |
| OW |
45 |
1185 |
251 |
487 |
92 |
7 |
0 |
0 |
| VODI |
0 |
327 |
183 |
1539 |
627 |
10 |
0 |
0 |
| ODI |
0 |
41 |
36 |
612 |
2075 |
93 |
0 |
0 |
| CDI |
0 |
0 |
19 |
228 |
3185 |
7603 |
0 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
129 |
7374 |
0 |
0 |
|
...date precedes bulletin
|
Date: 2025-07-15:
| 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 |
3231 |
4205 |
61 |
39 |
2 |
0 |
0 |
0 |
| OW |
11 |
1248 |
473 |
874 |
43 |
0 |
0 |
0 |
| VODI |
0 |
30 |
65 |
1894 |
615 |
0 |
0 |
0 |
| ODI |
0 |
1 |
0 |
222 |
3497 |
101 |
0 |
0 |
| CDI |
0 |
0 |
0 |
1 |
1671 |
13144 |
220 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
1270 |
178 |
0 |
|
...date precedes bulletin
|
Date: 2025-07-17:
| 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 |
3259 |
4192 |
56 |
81 |
4 |
0 |
0 |
0 |
| OW |
13 |
1496 |
427 |
929 |
70 |
0 |
0 |
0 |
| VODI |
0 |
101 |
113 |
1962 |
568 |
1 |
0 |
0 |
| ODI |
0 |
1 |
0 |
254 |
3384 |
51 |
0 |
0 |
| CDI |
0 |
0 |
0 |
8 |
1771 |
12999 |
476 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
675 |
205 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
3254 |
4352 |
62 |
102 |
2 |
0 |
0 |
0 |
| OW |
18 |
1322 |
427 |
893 |
87 |
0 |
0 |
0 |
| VODI |
0 |
115 |
107 |
1917 |
589 |
0 |
0 |
0 |
| ODI |
0 |
1 |
0 |
310 |
3315 |
228 |
0 |
0 |
| CDI |
0 |
0 |
0 |
12 |
1804 |
12796 |
428 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
702 |
253 |
0 |
|
Date: 2025-07-19:
| 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 |
3198 |
4381 |
47 |
37 |
5 |
0 |
0 |
0 |
| OW |
5 |
2160 |
450 |
691 |
66 |
0 |
0 |
0 |
| VODI |
0 |
339 |
262 |
1790 |
533 |
0 |
0 |
0 |
| ODI |
0 |
0 |
6 |
580 |
2807 |
37 |
0 |
0 |
| CDI |
0 |
0 |
0 |
38 |
2974 |
11154 |
1193 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
253 |
90 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
3197 |
4526 |
68 |
50 |
4 |
0 |
0 |
0 |
| OW |
6 |
1940 |
433 |
661 |
64 |
0 |
0 |
0 |
| VODI |
0 |
411 |
248 |
1745 |
602 |
0 |
0 |
0 |
| ODI |
0 |
3 |
16 |
625 |
2811 |
168 |
0 |
0 |
| CDI |
0 |
0 |
0 |
55 |
2904 |
11112 |
1141 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
164 |
142 |
0 |
|
Date: 2025-07-21:
| 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 |
3511 |
5124 |
93 |
86 |
11 |
0 |
0 |
0 |
| OW |
0 |
2233 |
634 |
1283 |
34 |
0 |
0 |
0 |
| VODI |
0 |
25 |
23 |
1884 |
904 |
0 |
0 |
0 |
| ODI |
0 |
0 |
0 |
34 |
4099 |
614 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
820 |
11682 |
2 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
3510 |
4365 |
51 |
84 |
17 |
0 |
0 |
0 |
| OW |
1 |
2485 |
382 |
657 |
61 |
0 |
0 |
0 |
| VODI |
0 |
508 |
264 |
1709 |
575 |
0 |
0 |
0 |
| ODI |
0 |
24 |
53 |
785 |
2184 |
381 |
0 |
0 |
| CDI |
0 |
0 |
0 |
52 |
3031 |
11888 |
2 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
27 |
0 |
0 |
|
Date: 2025-07-23:
| 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 |
3983 |
5181 |
132 |
73 |
7 |
0 |
0 |
0 |
| OW |
23 |
2561 |
568 |
990 |
33 |
0 |
0 |
0 |
| VODI |
0 |
78 |
77 |
2068 |
803 |
0 |
0 |
0 |
| ODI |
0 |
0 |
0 |
91 |
3910 |
241 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
2986 |
9291 |
0 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
3978 |
4134 |
54 |
70 |
9 |
0 |
0 |
0 |
| OW |
28 |
3071 |
363 |
590 |
54 |
0 |
0 |
0 |
| VODI |
0 |
567 |
296 |
1672 |
473 |
0 |
0 |
0 |
| ODI |
0 |
48 |
64 |
824 |
2177 |
252 |
0 |
0 |
| CDI |
0 |
0 |
0 |
66 |
5026 |
9010 |
0 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
270 |
0 |
0 |
|
Date: 2025-07-25:
| 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 |
5727 |
4395 |
56 |
36 |
0 |
0 |
0 |
0 |
| OW |
434 |
2537 |
472 |
689 |
23 |
0 |
0 |
0 |
| VODI |
8 |
184 |
208 |
2004 |
721 |
0 |
0 |
0 |
| ODI |
0 |
1 |
1 |
247 |
3118 |
442 |
0 |
0 |
| CDI |
0 |
0 |
0 |
6 |
2376 |
9407 |
0 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
4 |
0 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
5556 |
3071 |
28 |
41 |
1 |
0 |
0 |
0 |
| OW |
613 |
2844 |
261 |
486 |
37 |
0 |
0 |
0 |
| VODI |
0 |
961 |
314 |
1253 |
391 |
0 |
0 |
0 |
| ODI |
0 |
236 |
125 |
1040 |
1576 |
332 |
0 |
0 |
| CDI |
0 |
5 |
9 |
162 |
3914 |
9053 |
0 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
319 |
468 |
0 |
0 |
|
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