Validation of sea ice concentration - Asian sector
Bulletin date: 2025-05-29
Data source: OSI SAF N.H. AMSR sea ice concentration
Model vs. observations, sea ice class contingency tables
Date: 2025-05-23:
| 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 |
2 |
604 |
8 |
12 |
0 |
0 |
1 |
0 |
| OW |
0 |
783 |
68 |
46 |
12 |
3 |
1 |
10 |
| VODI |
0 |
492 |
206 |
373 |
152 |
15 |
25 |
48 |
| ODI |
0 |
126 |
85 |
372 |
621 |
212 |
114 |
59 |
| CDI |
0 |
48 |
40 |
222 |
931 |
3793 |
2388 |
79 |
| VCDI |
0 |
2 |
1 |
6 |
105 |
3400 |
14546 |
2071 |
|
...date precedes bulletin
|
Date: 2025-05-25:
| 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 |
0 |
538 |
4 |
4 |
1 |
0 |
0 |
0 |
| OW |
0 |
678 |
78 |
46 |
10 |
4 |
14 |
0 |
| VODI |
0 |
520 |
194 |
405 |
209 |
30 |
55 |
48 |
| ODI |
0 |
95 |
103 |
439 |
850 |
408 |
211 |
89 |
| CDI |
0 |
36 |
31 |
199 |
852 |
4706 |
2163 |
125 |
| VCDI |
0 |
0 |
0 |
24 |
158 |
3165 |
14752 |
838 |
|
...date precedes bulletin
|
Date: 2025-05-27:
| 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 |
2 |
656 |
5 |
9 |
1 |
0 |
0 |
0 |
| OW |
0 |
978 |
90 |
55 |
13 |
2 |
1 |
0 |
| VODI |
0 |
368 |
257 |
430 |
113 |
17 |
18 |
0 |
| ODI |
0 |
43 |
81 |
414 |
1004 |
318 |
57 |
0 |
| CDI |
0 |
9 |
27 |
136 |
900 |
4883 |
1335 |
2 |
| VCDI |
0 |
0 |
0 |
32 |
85 |
1343 |
13649 |
4749 |
|
...date precedes bulletin
|
Date: 2025-05-29:
| 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 |
5 |
809 |
1 |
3 |
1 |
0 |
0 |
0 |
| OW |
0 |
1016 |
66 |
51 |
17 |
4 |
1 |
0 |
| VODI |
0 |
489 |
233 |
354 |
128 |
6 |
18 |
0 |
| ODI |
0 |
103 |
104 |
395 |
932 |
239 |
36 |
0 |
| CDI |
0 |
34 |
52 |
200 |
1268 |
4281 |
1046 |
0 |
| VCDI |
0 |
0 |
0 |
39 |
210 |
3237 |
12492 |
4212 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
5 |
862 |
7 |
6 |
3 |
0 |
1 |
0 |
| OW |
0 |
966 |
68 |
47 |
16 |
4 |
0 |
0 |
| VODI |
0 |
478 |
229 |
379 |
148 |
5 |
21 |
0 |
| ODI |
0 |
97 |
91 |
365 |
894 |
257 |
40 |
0 |
| CDI |
0 |
48 |
61 |
207 |
1296 |
4090 |
1129 |
0 |
| VCDI |
0 |
0 |
0 |
38 |
199 |
3411 |
12402 |
4212 |
|
Date: 2025-05-31:
| 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 |
5 |
827 |
1 |
15 |
0 |
0 |
0 |
0 |
| OW |
0 |
1000 |
76 |
54 |
10 |
6 |
9 |
0 |
| VODI |
0 |
671 |
212 |
334 |
88 |
34 |
35 |
0 |
| ODI |
0 |
196 |
94 |
439 |
786 |
288 |
117 |
0 |
| CDI |
0 |
81 |
46 |
238 |
1197 |
3059 |
1957 |
0 |
| VCDI |
0 |
0 |
1 |
33 |
165 |
2639 |
12567 |
4802 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
5 |
898 |
9 |
24 |
0 |
0 |
1 |
0 |
| OW |
0 |
980 |
77 |
37 |
11 |
7 |
4 |
0 |
| VODI |
0 |
604 |
207 |
357 |
121 |
38 |
39 |
0 |
| ODI |
0 |
184 |
86 |
413 |
733 |
305 |
130 |
0 |
| CDI |
0 |
109 |
50 |
253 |
1210 |
2990 |
1912 |
0 |
| VCDI |
0 |
0 |
1 |
29 |
171 |
2686 |
12599 |
4802 |
|
Date: 2025-06-02:
| 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 |
3 |
1120 |
17 |
14 |
0 |
3 |
8 |
0 |
| OW |
0 |
1389 |
133 |
82 |
17 |
10 |
18 |
0 |
| VODI |
0 |
389 |
300 |
545 |
156 |
24 |
13 |
0 |
| ODI |
0 |
26 |
54 |
427 |
1246 |
443 |
42 |
0 |
| CDI |
0 |
0 |
0 |
99 |
606 |
3993 |
904 |
0 |
| VCDI |
0 |
0 |
1 |
27 |
98 |
2112 |
11415 |
6348 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
3 |
935 |
15 |
22 |
1 |
1 |
9 |
0 |
| OW |
0 |
953 |
83 |
57 |
15 |
17 |
23 |
0 |
| VODI |
0 |
642 |
207 |
364 |
171 |
59 |
49 |
0 |
| ODI |
0 |
257 |
113 |
364 |
725 |
505 |
216 |
0 |
| CDI |
0 |
137 |
84 |
342 |
1046 |
3445 |
2207 |
0 |
| VCDI |
0 |
0 |
3 |
45 |
165 |
2558 |
9896 |
6348 |
|
Date: 2025-06-04:
| 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 |
1 |
1161 |
27 |
11 |
6 |
2 |
0 |
0 |
| OW |
0 |
1417 |
164 |
100 |
39 |
15 |
4 |
0 |
| VODI |
0 |
425 |
316 |
560 |
201 |
21 |
21 |
0 |
| ODI |
0 |
23 |
47 |
418 |
1091 |
484 |
75 |
0 |
| CDI |
0 |
5 |
10 |
151 |
809 |
3910 |
1617 |
6 |
| VCDI |
0 |
0 |
0 |
35 |
102 |
2175 |
11610 |
5023 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
1 |
927 |
28 |
21 |
4 |
0 |
0 |
0 |
| OW |
0 |
991 |
104 |
88 |
18 |
3 |
1 |
5 |
| VODI |
0 |
654 |
217 |
341 |
234 |
72 |
33 |
21 |
| ODI |
0 |
316 |
119 |
387 |
771 |
594 |
305 |
48 |
| CDI |
0 |
143 |
95 |
383 |
1085 |
3526 |
3051 |
72 |
| VCDI |
0 |
0 |
1 |
55 |
136 |
2412 |
9937 |
4883 |
|
Date: 2025-06-06:
| 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 |
89 |
1133 |
10 |
6 |
0 |
1 |
0 |
0 |
| OW |
0 |
1554 |
105 |
76 |
22 |
3 |
2 |
0 |
| VODI |
0 |
608 |
239 |
415 |
253 |
43 |
21 |
0 |
| ODI |
0 |
72 |
102 |
487 |
1067 |
406 |
139 |
0 |
| CDI |
0 |
5 |
24 |
188 |
1160 |
3747 |
1351 |
14 |
| VCDI |
0 |
0 |
0 |
4 |
68 |
1152 |
11386 |
6130 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
89 |
877 |
18 |
12 |
3 |
1 |
0 |
0 |
| OW |
0 |
1038 |
82 |
126 |
54 |
10 |
0 |
4 |
| VODI |
0 |
813 |
114 |
267 |
250 |
104 |
42 |
20 |
| ODI |
0 |
490 |
130 |
307 |
760 |
728 |
213 |
49 |
| CDI |
0 |
153 |
133 |
427 |
1352 |
3298 |
3807 |
500 |
| VCDI |
0 |
1 |
3 |
37 |
151 |
1211 |
8837 |
5571 |
|
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