Validation of sea ice concentration - Asian sector
Bulletin date: 2025-08-21
Data source: OSI SAF N.H. multi-product sea ice concentration
Model vs. observations, sea ice class contingency tables
Date: 2025-08-15:
| 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 |
10633 |
4055 |
11 |
0 |
0 |
0 |
0 |
0 |
| OW |
665 |
1534 |
326 |
230 |
0 |
0 |
0 |
0 |
| VODI |
13 |
111 |
166 |
1817 |
303 |
0 |
0 |
0 |
| ODI |
0 |
0 |
0 |
173 |
4518 |
419 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
1378 |
6744 |
0 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
...date precedes bulletin
|
Date: 2025-08-17:
| 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 |
10916 |
3889 |
10 |
5 |
0 |
0 |
0 |
0 |
| OW |
572 |
1609 |
301 |
171 |
0 |
0 |
0 |
0 |
| VODI |
0 |
146 |
217 |
1735 |
499 |
1 |
0 |
0 |
| ODI |
0 |
0 |
0 |
288 |
4955 |
276 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
2341 |
5164 |
1 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
...date precedes bulletin
|
Date: 2025-08-19:
| 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 |
11450 |
4429 |
17 |
25 |
0 |
0 |
0 |
0 |
| OW |
262 |
1222 |
394 |
673 |
0 |
0 |
0 |
0 |
| VODI |
0 |
2 |
27 |
1425 |
658 |
1 |
0 |
0 |
| ODI |
0 |
0 |
0 |
42 |
6660 |
1184 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
711 |
3914 |
0 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
...date precedes bulletin
|
Date: 2025-08-21:
| 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 |
11649 |
4405 |
22 |
18 |
0 |
0 |
0 |
0 |
| OW |
230 |
1305 |
407 |
435 |
0 |
0 |
0 |
0 |
| VODI |
0 |
20 |
71 |
1577 |
683 |
2 |
0 |
0 |
| ODI |
0 |
0 |
0 |
102 |
5683 |
1424 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
1585 |
3455 |
23 |
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 |
11620 |
4678 |
58 |
40 |
0 |
0 |
0 |
0 |
| OW |
259 |
1026 |
379 |
531 |
8 |
0 |
0 |
0 |
| VODI |
0 |
26 |
63 |
1402 |
756 |
2 |
0 |
0 |
| ODI |
0 |
0 |
0 |
159 |
5488 |
1141 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
1699 |
3738 |
23 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
Date: 2025-08-23:
| 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 |
11517 |
4658 |
25 |
13 |
0 |
0 |
0 |
0 |
| OW |
186 |
1441 |
324 |
328 |
0 |
0 |
0 |
0 |
| VODI |
0 |
58 |
134 |
1633 |
711 |
0 |
0 |
0 |
| ODI |
0 |
0 |
0 |
142 |
5361 |
1239 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
1742 |
3584 |
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 |
11482 |
4813 |
46 |
23 |
0 |
0 |
0 |
0 |
| OW |
221 |
1284 |
302 |
461 |
14 |
0 |
0 |
0 |
| VODI |
0 |
60 |
135 |
1439 |
795 |
0 |
0 |
0 |
| ODI |
0 |
0 |
0 |
193 |
5106 |
901 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
1899 |
3922 |
0 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
Date: 2025-08-25:
| 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 |
12184 |
4758 |
20 |
8 |
0 |
0 |
0 |
0 |
| OW |
74 |
1107 |
374 |
563 |
0 |
0 |
0 |
0 |
| VODI |
0 |
17 |
45 |
1658 |
476 |
0 |
0 |
0 |
| ODI |
0 |
0 |
0 |
71 |
5655 |
114 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
2037 |
3801 |
103 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
31 |
0 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
12061 |
4121 |
28 |
9 |
0 |
0 |
0 |
0 |
| OW |
197 |
1578 |
230 |
374 |
13 |
0 |
0 |
0 |
| VODI |
0 |
183 |
179 |
1623 |
651 |
0 |
0 |
0 |
| ODI |
0 |
0 |
2 |
294 |
4864 |
903 |
6 |
0 |
| CDI |
0 |
0 |
0 |
0 |
2640 |
3043 |
97 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
Date: 2025-08-27:
| 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 |
12035 |
4978 |
22 |
10 |
0 |
0 |
0 |
0 |
| OW |
57 |
1150 |
410 |
413 |
0 |
0 |
0 |
0 |
| VODI |
0 |
13 |
46 |
1575 |
729 |
0 |
0 |
0 |
| ODI |
0 |
0 |
0 |
62 |
4751 |
293 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
1704 |
4794 |
54 |
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 |
11950 |
3999 |
24 |
7 |
0 |
0 |
0 |
0 |
| OW |
142 |
1801 |
220 |
306 |
15 |
0 |
0 |
0 |
| VODI |
0 |
341 |
232 |
1410 |
782 |
3 |
0 |
0 |
| ODI |
0 |
0 |
2 |
337 |
4231 |
1686 |
44 |
0 |
| CDI |
0 |
0 |
0 |
0 |
2156 |
3398 |
10 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
Date: 2025-08-29:
| 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 |
12607 |
4455 |
24 |
8 |
0 |
0 |
0 |
0 |
| OW |
25 |
1323 |
356 |
306 |
0 |
0 |
0 |
0 |
| VODI |
0 |
25 |
88 |
1898 |
499 |
0 |
0 |
0 |
| ODI |
0 |
0 |
0 |
133 |
4543 |
726 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
1493 |
4587 |
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 |
12530 |
3393 |
21 |
11 |
0 |
0 |
0 |
0 |
| OW |
102 |
1872 |
188 |
314 |
23 |
0 |
0 |
0 |
| VODI |
0 |
536 |
244 |
1512 |
655 |
5 |
0 |
0 |
| ODI |
0 |
2 |
15 |
508 |
4335 |
947 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
1522 |
4361 |
0 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
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