Validation of sea ice concentration - Asian sector
Bulletin date: 2025-08-28
Data source: OSI SAF N.H. multi-product sea ice concentration
Model vs. observations, sea ice class contingency tables
Date: 2025-08-22:
| 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 |
11411 |
4723 |
30 |
12 |
0 |
0 |
0 |
0 |
| OW |
205 |
1356 |
373 |
386 |
0 |
0 |
0 |
0 |
| VODI |
0 |
30 |
90 |
1546 |
782 |
0 |
0 |
0 |
| ODI |
0 |
0 |
0 |
86 |
5317 |
1404 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
1554 |
3705 |
86 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
...date precedes bulletin
|
Date: 2025-08-24:
| 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 |
12083 |
4110 |
15 |
0 |
0 |
0 |
0 |
0 |
| OW |
169 |
1552 |
304 |
255 |
0 |
0 |
0 |
0 |
| VODI |
0 |
106 |
157 |
1757 |
587 |
0 |
0 |
0 |
| ODI |
0 |
0 |
0 |
193 |
5367 |
1194 |
1 |
0 |
| CDI |
0 |
0 |
0 |
0 |
2099 |
3139 |
8 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
...date precedes bulletin
|
Date: 2025-08-26:
| Best estimate |
Forecast |
|
...observations not yet available
|
...observations not yet available
|
Date: 2025-08-28:
| 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 |
12212 |
4848 |
20 |
22 |
0 |
0 |
0 |
0 |
| OW |
42 |
1271 |
360 |
344 |
0 |
0 |
0 |
0 |
| VODI |
0 |
14 |
89 |
1694 |
595 |
0 |
0 |
0 |
| ODI |
0 |
0 |
0 |
103 |
4736 |
274 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
1743 |
4729 |
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 |
12202 |
5153 |
43 |
21 |
0 |
0 |
0 |
0 |
| OW |
52 |
953 |
324 |
378 |
0 |
0 |
0 |
0 |
| VODI |
0 |
27 |
102 |
1603 |
571 |
0 |
0 |
0 |
| ODI |
0 |
0 |
0 |
161 |
4745 |
554 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
1758 |
4449 |
0 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
Date: 2025-08-30:
| 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 |
12684 |
4324 |
16 |
10 |
0 |
0 |
0 |
0 |
| OW |
17 |
1410 |
355 |
256 |
0 |
0 |
0 |
0 |
| VODI |
0 |
27 |
122 |
1944 |
555 |
0 |
0 |
0 |
| ODI |
0 |
0 |
0 |
157 |
4728 |
1030 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
1018 |
4401 |
42 |
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 |
12668 |
4597 |
30 |
13 |
0 |
0 |
0 |
0 |
| OW |
33 |
1126 |
338 |
270 |
0 |
0 |
0 |
0 |
| VODI |
0 |
38 |
125 |
1868 |
551 |
0 |
0 |
0 |
| ODI |
0 |
0 |
0 |
216 |
4625 |
1371 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
1125 |
4060 |
42 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
Date: 2025-09-01:
| 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 |
12460 |
4857 |
25 |
15 |
0 |
0 |
0 |
0 |
| OW |
0 |
937 |
446 |
700 |
0 |
0 |
0 |
0 |
| VODI |
0 |
0 |
10 |
1793 |
599 |
0 |
0 |
0 |
| ODI |
0 |
0 |
0 |
44 |
6910 |
229 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
985 |
3078 |
0 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
8 |
0 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
12446 |
4387 |
35 |
17 |
0 |
0 |
0 |
0 |
| OW |
14 |
1309 |
292 |
306 |
0 |
0 |
0 |
0 |
| VODI |
0 |
98 |
154 |
1902 |
741 |
0 |
0 |
0 |
| ODI |
0 |
0 |
0 |
327 |
6002 |
1143 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
1751 |
2172 |
0 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
Date: 2025-09-03:
| 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 |
12486 |
4653 |
31 |
7 |
0 |
0 |
0 |
0 |
| OW |
0 |
1136 |
418 |
528 |
0 |
0 |
0 |
0 |
| VODI |
0 |
13 |
56 |
1961 |
560 |
0 |
0 |
0 |
| ODI |
0 |
0 |
0 |
81 |
6445 |
588 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
896 |
3237 |
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 |
12484 |
4196 |
42 |
11 |
0 |
0 |
0 |
0 |
| OW |
2 |
1460 |
272 |
304 |
1 |
0 |
0 |
0 |
| VODI |
0 |
146 |
191 |
1866 |
858 |
0 |
0 |
0 |
| ODI |
0 |
0 |
0 |
396 |
5518 |
1481 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
1524 |
2344 |
0 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
Date: 2025-09-05:
| 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 |
12442 |
4444 |
22 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
1308 |
397 |
394 |
1 |
0 |
0 |
0 |
| VODI |
0 |
59 |
81 |
2242 |
474 |
0 |
0 |
0 |
| ODI |
0 |
0 |
0 |
59 |
6117 |
815 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
899 |
3342 |
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 |
12441 |
4134 |
58 |
21 |
0 |
0 |
0 |
0 |
| OW |
1 |
1442 |
235 |
446 |
10 |
0 |
0 |
0 |
| VODI |
0 |
235 |
205 |
1852 |
1011 |
25 |
0 |
0 |
| ODI |
0 |
0 |
2 |
376 |
4866 |
1595 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
1604 |
2537 |
0 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
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