Validation of sea ice concentration - Asian sector
Bulletin date: 2025-06-05
Data source: OSI SAF N.H. AMSR sea ice concentration
Model vs. observations, sea ice class contingency tables
Date: 2025-05-30:
| 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 |
5 |
813 |
2 |
5 |
2 |
0 |
0 |
0 |
| OW |
0 |
1008 |
56 |
52 |
18 |
6 |
1 |
0 |
| VODI |
0 |
575 |
238 |
358 |
106 |
8 |
12 |
0 |
| ODI |
0 |
187 |
81 |
415 |
873 |
239 |
66 |
0 |
| CDI |
0 |
92 |
49 |
240 |
1211 |
3494 |
1465 |
0 |
| VCDI |
0 |
0 |
0 |
18 |
137 |
2775 |
12648 |
4827 |
|
...date precedes bulletin
|
Date: 2025-06-01:
| 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 |
5 |
811 |
3 |
22 |
1 |
0 |
6 |
0 |
| OW |
0 |
1010 |
80 |
42 |
18 |
3 |
26 |
0 |
| VODI |
0 |
717 |
230 |
330 |
105 |
18 |
39 |
0 |
| ODI |
0 |
232 |
107 |
418 |
770 |
352 |
142 |
0 |
| CDI |
0 |
113 |
62 |
265 |
1132 |
3418 |
2022 |
0 |
| VCDI |
0 |
0 |
0 |
50 |
183 |
2503 |
10062 |
6785 |
|
...date precedes bulletin
|
Date: 2025-06-03:
| 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 |
0 |
1139 |
10 |
10 |
2 |
1 |
9 |
0 |
| OW |
0 |
1396 |
167 |
95 |
23 |
11 |
17 |
0 |
| VODI |
0 |
412 |
304 |
554 |
178 |
19 |
14 |
0 |
| ODI |
0 |
26 |
42 |
427 |
1167 |
452 |
63 |
0 |
| CDI |
0 |
2 |
3 |
124 |
675 |
4093 |
1285 |
0 |
| VCDI |
0 |
0 |
0 |
30 |
104 |
2263 |
11431 |
5534 |
|
...date precedes bulletin
|
Date: 2025-06-05:
| 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 |
84 |
1124 |
12 |
7 |
0 |
0 |
0 |
0 |
| OW |
0 |
1479 |
167 |
89 |
30 |
9 |
4 |
0 |
| VODI |
0 |
461 |
284 |
519 |
230 |
37 |
28 |
0 |
| ODI |
0 |
49 |
63 |
448 |
1059 |
428 |
119 |
0 |
| CDI |
0 |
5 |
18 |
165 |
973 |
3730 |
1732 |
7 |
| VCDI |
0 |
0 |
0 |
7 |
79 |
1605 |
12890 |
4141 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
84 |
1116 |
12 |
4 |
0 |
0 |
1 |
0 |
| OW |
0 |
1461 |
151 |
90 |
27 |
9 |
0 |
0 |
| VODI |
0 |
483 |
297 |
525 |
230 |
34 |
27 |
0 |
| ODI |
0 |
52 |
61 |
447 |
1086 |
411 |
143 |
0 |
| CDI |
0 |
6 |
23 |
162 |
946 |
3729 |
1712 |
7 |
| VCDI |
0 |
0 |
0 |
7 |
82 |
1626 |
12890 |
4141 |
|
Date: 2025-06-07:
| 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 |
98 |
1115 |
9 |
7 |
0 |
0 |
1 |
0 |
| OW |
0 |
1575 |
108 |
53 |
14 |
5 |
2 |
0 |
| VODI |
0 |
705 |
260 |
451 |
212 |
38 |
34 |
0 |
| ODI |
7 |
109 |
130 |
552 |
1206 |
307 |
150 |
0 |
| CDI |
0 |
17 |
27 |
259 |
1254 |
3281 |
1265 |
13 |
| VCDI |
0 |
0 |
0 |
16 |
98 |
1654 |
8430 |
8620 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
98 |
1109 |
11 |
9 |
0 |
0 |
1 |
0 |
| OW |
0 |
1522 |
107 |
69 |
15 |
5 |
2 |
0 |
| VODI |
1 |
749 |
254 |
428 |
199 |
29 |
46 |
0 |
| ODI |
6 |
118 |
134 |
552 |
1254 |
332 |
153 |
0 |
| CDI |
0 |
23 |
28 |
261 |
1201 |
3196 |
1179 |
14 |
| VCDI |
0 |
0 |
0 |
19 |
115 |
1723 |
8501 |
8619 |
|
Date: 2025-06-09:
| 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 |
132 |
1707 |
23 |
14 |
1 |
0 |
1 |
0 |
| OW |
0 |
1589 |
145 |
69 |
8 |
3 |
0 |
0 |
| VODI |
7 |
380 |
326 |
787 |
262 |
27 |
10 |
0 |
| ODI |
0 |
20 |
46 |
445 |
1648 |
512 |
33 |
0 |
| CDI |
0 |
0 |
1 |
105 |
651 |
4115 |
980 |
0 |
| VCDI |
0 |
0 |
0 |
1 |
44 |
825 |
10056 |
7109 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
132 |
1145 |
12 |
19 |
3 |
0 |
1 |
0 |
| OW |
0 |
1534 |
92 |
54 |
13 |
6 |
1 |
0 |
| VODI |
3 |
858 |
269 |
522 |
212 |
34 |
45 |
0 |
| ODI |
4 |
136 |
128 |
581 |
1180 |
504 |
188 |
0 |
| CDI |
0 |
23 |
40 |
229 |
1108 |
3789 |
1926 |
0 |
| VCDI |
0 |
0 |
0 |
16 |
98 |
1149 |
8919 |
7109 |
|
Date: 2025-06-11:
| 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 |
196 |
1950 |
17 |
7 |
2 |
0 |
1 |
0 |
| OW |
0 |
1409 |
182 |
102 |
20 |
15 |
2 |
0 |
| VODI |
9 |
393 |
304 |
821 |
312 |
51 |
19 |
0 |
| ODI |
0 |
33 |
58 |
444 |
1312 |
577 |
79 |
0 |
| CDI |
0 |
10 |
33 |
121 |
768 |
3848 |
3003 |
0 |
| VCDI |
0 |
0 |
0 |
10 |
228 |
703 |
7602 |
7441 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
196 |
1179 |
23 |
16 |
3 |
1 |
1 |
0 |
| OW |
0 |
1536 |
74 |
48 |
20 |
13 |
2 |
0 |
| VODI |
9 |
916 |
317 |
568 |
201 |
67 |
88 |
0 |
| ODI |
0 |
141 |
122 |
650 |
1067 |
592 |
232 |
0 |
| CDI |
0 |
21 |
52 |
199 |
1144 |
3887 |
3012 |
32 |
| VCDI |
0 |
2 |
6 |
24 |
207 |
634 |
7371 |
7409 |
|
Date: 2025-06-13:
| 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 |
213 |
2075 |
22 |
8 |
2 |
0 |
1 |
0 |
| OW |
2 |
1348 |
160 |
132 |
23 |
13 |
1 |
0 |
| VODI |
11 |
423 |
286 |
833 |
361 |
47 |
32 |
0 |
| ODI |
0 |
41 |
53 |
473 |
1115 |
551 |
125 |
0 |
| CDI |
0 |
16 |
38 |
135 |
832 |
3720 |
2659 |
0 |
| VCDI |
0 |
0 |
0 |
4 |
358 |
940 |
7520 |
7509 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
213 |
1176 |
13 |
13 |
6 |
2 |
2 |
0 |
| OW |
1 |
1469 |
93 |
83 |
17 |
9 |
5 |
0 |
| VODI |
12 |
1092 |
265 |
564 |
275 |
94 |
130 |
0 |
| ODI |
0 |
144 |
145 |
719 |
1009 |
668 |
219 |
0 |
| CDI |
0 |
22 |
43 |
198 |
1107 |
3849 |
2967 |
0 |
| VCDI |
0 |
0 |
0 |
8 |
277 |
649 |
7015 |
7509 |
|
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