Validation of sea ice concentration - Asian sector
Bulletin date: 2025-07-31
Data source: OSI SAF N.H. multi-product sea ice concentration
Model vs. observations, sea ice class contingency tables
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 |
|
...date precedes bulletin
|
Date: 2025-07-27:
| 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 |
5613 |
5187 |
58 |
27 |
0 |
0 |
0 |
0 |
| OW |
393 |
2632 |
454 |
691 |
40 |
0 |
0 |
0 |
| VODI |
0 |
282 |
245 |
1750 |
899 |
0 |
0 |
0 |
| ODI |
0 |
1 |
1 |
238 |
2818 |
556 |
0 |
0 |
| CDI |
0 |
0 |
0 |
2 |
1863 |
9190 |
0 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
156 |
0 |
0 |
|
...date precedes bulletin
|
Date: 2025-07-29:
| 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 |
6532 |
6064 |
72 |
52 |
3 |
0 |
0 |
0 |
| OW |
142 |
1789 |
546 |
852 |
19 |
0 |
0 |
0 |
| VODI |
0 |
32 |
38 |
1637 |
643 |
0 |
0 |
0 |
| ODI |
0 |
0 |
1 |
45 |
4074 |
1098 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
673 |
8642 |
142 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
...date precedes bulletin
|
Date: 2025-07-31:
| 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 |
6658 |
6187 |
96 |
32 |
1 |
0 |
0 |
0 |
| OW |
145 |
1856 |
492 |
631 |
11 |
0 |
0 |
0 |
| VODI |
0 |
85 |
78 |
1789 |
486 |
0 |
0 |
0 |
| ODI |
0 |
0 |
1 |
108 |
3976 |
3181 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
1099 |
6034 |
150 |
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 |
6657 |
6220 |
127 |
45 |
1 |
0 |
0 |
0 |
| OW |
146 |
1835 |
462 |
677 |
13 |
0 |
0 |
0 |
| VODI |
0 |
73 |
77 |
1713 |
529 |
0 |
0 |
0 |
| ODI |
0 |
0 |
1 |
125 |
3770 |
3207 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
1260 |
6008 |
150 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
Date: 2025-08-02:
| 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 |
6732 |
6076 |
51 |
26 |
0 |
0 |
0 |
0 |
| OW |
126 |
2016 |
419 |
545 |
1 |
0 |
0 |
0 |
| VODI |
0 |
162 |
175 |
1828 |
533 |
0 |
0 |
0 |
| ODI |
0 |
2 |
1 |
195 |
3405 |
5099 |
29 |
0 |
| CDI |
0 |
0 |
0 |
2 |
933 |
4527 |
213 |
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 |
6741 |
6125 |
83 |
33 |
0 |
0 |
0 |
0 |
| OW |
117 |
1997 |
413 |
612 |
1 |
0 |
0 |
0 |
| VODI |
0 |
132 |
150 |
1771 |
679 |
0 |
0 |
0 |
| ODI |
0 |
2 |
0 |
174 |
3182 |
4669 |
41 |
0 |
| CDI |
0 |
0 |
0 |
6 |
1010 |
4957 |
201 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
Date: 2025-08-04:
| 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 |
6553 |
7443 |
47 |
32 |
0 |
0 |
0 |
0 |
| OW |
24 |
1513 |
577 |
789 |
11 |
0 |
0 |
0 |
| VODI |
0 |
24 |
44 |
1533 |
318 |
0 |
0 |
0 |
| ODI |
0 |
0 |
0 |
107 |
3476 |
398 |
0 |
0 |
| CDI |
0 |
0 |
0 |
1 |
1511 |
8226 |
0 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
397 |
72 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
6499 |
6389 |
41 |
24 |
0 |
0 |
0 |
0 |
| OW |
78 |
2322 |
338 |
415 |
0 |
0 |
0 |
0 |
| VODI |
0 |
269 |
288 |
1690 |
707 |
0 |
0 |
0 |
| ODI |
0 |
0 |
1 |
327 |
3449 |
4806 |
55 |
0 |
| CDI |
0 |
0 |
0 |
6 |
1160 |
4215 |
17 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
Date: 2025-08-06:
| 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 |
7311 |
6781 |
46 |
31 |
0 |
0 |
0 |
0 |
| OW |
45 |
1811 |
400 |
502 |
4 |
0 |
0 |
0 |
| VODI |
0 |
91 |
107 |
1344 |
454 |
11 |
0 |
0 |
| ODI |
0 |
0 |
0 |
161 |
2830 |
1299 |
42 |
0 |
| CDI |
0 |
0 |
0 |
0 |
1330 |
8075 |
238 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
183 |
0 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
7255 |
5561 |
38 |
34 |
0 |
0 |
0 |
0 |
| OW |
101 |
2561 |
266 |
343 |
0 |
0 |
0 |
0 |
| VODI |
0 |
561 |
236 |
1319 |
878 |
28 |
0 |
0 |
| ODI |
0 |
0 |
13 |
341 |
2831 |
5638 |
34 |
0 |
| CDI |
0 |
0 |
0 |
1 |
909 |
3902 |
246 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
Date: 2025-08-08:
| 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 |
7769 |
6454 |
29 |
11 |
0 |
0 |
0 |
0 |
| OW |
62 |
1881 |
339 |
446 |
1 |
0 |
0 |
0 |
| VODI |
0 |
184 |
146 |
1412 |
406 |
0 |
0 |
0 |
| ODI |
0 |
0 |
6 |
245 |
3011 |
894 |
0 |
0 |
| CDI |
0 |
0 |
0 |
0 |
1645 |
7986 |
142 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
9 |
18 |
0 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
7702 |
5159 |
40 |
40 |
0 |
0 |
0 |
0 |
| OW |
129 |
2637 |
212 |
372 |
24 |
0 |
0 |
0 |
| VODI |
0 |
705 |
238 |
1264 |
805 |
47 |
0 |
0 |
| ODI |
0 |
18 |
30 |
416 |
2635 |
5644 |
105 |
0 |
| CDI |
0 |
0 |
0 |
22 |
1599 |
3198 |
55 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
|
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