Validation of sea ice concentration - Asian sector
Bulletin date: 2025-05-22
Data source: OSI SAF N.H. multi-product sea ice concentration
Model vs. observations, sea ice class contingency tables
Date: 2025-05-16:
| 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 |
167 |
618 |
10 |
26 |
0 |
0 |
0 |
19 |
| OW |
0 |
370 |
81 |
160 |
11 |
2 |
4 |
41 |
| VODI |
0 |
194 |
126 |
394 |
68 |
6 |
41 |
75 |
| ODI |
0 |
84 |
60 |
414 |
325 |
41 |
168 |
71 |
| CDI |
0 |
3 |
18 |
410 |
1318 |
2138 |
697 |
138 |
| VCDI |
0 |
0 |
0 |
27 |
308 |
2203 |
13349 |
8911 |
|
...date precedes bulletin
|
Date: 2025-05-18:
| 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 |
158 |
573 |
2 |
4 |
0 |
0 |
0 |
18 |
| OW |
0 |
347 |
68 |
132 |
9 |
2 |
0 |
35 |
| VODI |
0 |
234 |
125 |
355 |
48 |
7 |
17 |
78 |
| ODI |
0 |
92 |
61 |
469 |
424 |
52 |
214 |
100 |
| CDI |
0 |
1 |
20 |
544 |
1233 |
2647 |
1070 |
426 |
| VCDI |
0 |
0 |
0 |
40 |
331 |
2012 |
11621 |
9527 |
|
...date precedes bulletin
|
Date: 2025-05-20:
| 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 |
160 |
649 |
7 |
6 |
3 |
0 |
1 |
13 |
| OW |
0 |
683 |
159 |
122 |
12 |
2 |
0 |
15 |
| VODI |
0 |
106 |
169 |
849 |
142 |
15 |
3 |
49 |
| ODI |
0 |
5 |
13 |
391 |
770 |
98 |
53 |
65 |
| CDI |
0 |
0 |
0 |
150 |
1098 |
3461 |
761 |
117 |
| VCDI |
0 |
0 |
0 |
0 |
168 |
2759 |
11273 |
8749 |
|
...date precedes bulletin
|
Date: 2025-05-22:
| 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 |
181 |
586 |
12 |
17 |
1 |
0 |
0 |
2 |
| OW |
0 |
623 |
136 |
172 |
14 |
3 |
1 |
15 |
| VODI |
0 |
199 |
141 |
786 |
169 |
18 |
24 |
58 |
| ODI |
0 |
11 |
37 |
422 |
868 |
118 |
97 |
79 |
| CDI |
0 |
0 |
0 |
169 |
1233 |
3584 |
1713 |
446 |
| VCDI |
0 |
0 |
0 |
0 |
79 |
2595 |
11039 |
7448 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
181 |
615 |
11 |
17 |
2 |
1 |
1 |
7 |
| OW |
0 |
606 |
152 |
176 |
11 |
1 |
0 |
19 |
| VODI |
0 |
187 |
128 |
793 |
174 |
17 |
24 |
52 |
| ODI |
0 |
11 |
35 |
408 |
871 |
127 |
111 |
79 |
| CDI |
0 |
0 |
0 |
172 |
1212 |
3641 |
1773 |
342 |
| VCDI |
0 |
0 |
0 |
0 |
94 |
2531 |
10965 |
7549 |
|
Date: 2025-05-24:
| 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 |
150 |
606 |
3 |
16 |
1 |
0 |
0 |
0 |
| OW |
0 |
552 |
148 |
168 |
14 |
12 |
7 |
2 |
| VODI |
0 |
280 |
172 |
723 |
194 |
55 |
66 |
7 |
| ODI |
0 |
15 |
47 |
427 |
1136 |
181 |
163 |
3 |
| CDI |
0 |
0 |
0 |
153 |
1328 |
4417 |
1843 |
119 |
| VCDI |
0 |
0 |
0 |
0 |
83 |
2395 |
10265 |
7345 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
150 |
647 |
8 |
18 |
2 |
1 |
2 |
0 |
| OW |
0 |
521 |
143 |
168 |
17 |
8 |
15 |
4 |
| VODI |
0 |
270 |
179 |
741 |
201 |
52 |
79 |
4 |
| ODI |
0 |
15 |
40 |
395 |
1091 |
198 |
163 |
3 |
| CDI |
0 |
0 |
0 |
165 |
1351 |
4485 |
1936 |
91 |
| VCDI |
0 |
0 |
0 |
0 |
94 |
2316 |
10149 |
7374 |
|
Date: 2025-05-26:
| 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 |
150 |
616 |
8 |
14 |
1 |
1 |
0 |
0 |
| OW |
0 |
737 |
235 |
174 |
21 |
7 |
2 |
0 |
| VODI |
0 |
15 |
26 |
1018 |
230 |
17 |
9 |
6 |
| ODI |
0 |
0 |
1 |
173 |
1714 |
175 |
24 |
19 |
| CDI |
0 |
0 |
0 |
19 |
883 |
5966 |
645 |
160 |
| VCDI |
0 |
0 |
0 |
0 |
8 |
1139 |
10820 |
8063 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
150 |
585 |
3 |
14 |
1 |
2 |
0 |
0 |
| OW |
0 |
394 |
111 |
234 |
47 |
8 |
9 |
3 |
| VODI |
0 |
332 |
130 |
624 |
404 |
52 |
41 |
64 |
| ODI |
0 |
57 |
26 |
380 |
1105 |
345 |
242 |
86 |
| CDI |
0 |
0 |
0 |
146 |
1216 |
4665 |
3245 |
202 |
| VCDI |
0 |
0 |
0 |
0 |
84 |
2233 |
7963 |
7893 |
|
Date: 2025-05-28:
| 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 |
151 |
762 |
2 |
8 |
1 |
0 |
1 |
0 |
| OW |
0 |
810 |
173 |
217 |
22 |
3 |
1 |
0 |
| VODI |
0 |
92 |
121 |
871 |
144 |
28 |
8 |
0 |
| ODI |
0 |
1 |
14 |
309 |
1385 |
130 |
21 |
0 |
| CDI |
0 |
0 |
0 |
68 |
1343 |
5077 |
1174 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
97 |
1525 |
9316 |
9221 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
151 |
693 |
1 |
3 |
1 |
1 |
1 |
0 |
| OW |
0 |
481 |
117 |
281 |
20 |
3 |
1 |
0 |
| VODI |
0 |
387 |
124 |
660 |
324 |
85 |
28 |
0 |
| ODI |
0 |
103 |
61 |
312 |
1121 |
424 |
296 |
0 |
| CDI |
0 |
1 |
7 |
203 |
1347 |
4507 |
3165 |
33 |
| VCDI |
0 |
0 |
0 |
14 |
179 |
1743 |
7030 |
9188 |
|
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 |
151 |
835 |
1 |
9 |
3 |
0 |
0 |
0 |
| OW |
0 |
885 |
139 |
142 |
24 |
1 |
2 |
0 |
| VODI |
0 |
242 |
187 |
789 |
138 |
22 |
11 |
0 |
| ODI |
0 |
50 |
37 |
385 |
1277 |
167 |
46 |
0 |
| CDI |
0 |
3 |
5 |
162 |
1505 |
3969 |
1254 |
3 |
| VCDI |
0 |
0 |
0 |
0 |
123 |
2335 |
8494 |
9700 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
151 |
709 |
0 |
11 |
8 |
1 |
1 |
0 |
| OW |
0 |
606 |
126 |
222 |
21 |
1 |
1 |
0 |
| VODI |
0 |
532 |
147 |
579 |
353 |
77 |
17 |
0 |
| ODI |
0 |
153 |
71 |
404 |
1020 |
711 |
145 |
0 |
| CDI |
0 |
15 |
25 |
236 |
1424 |
3373 |
1916 |
27 |
| VCDI |
0 |
0 |
0 |
35 |
244 |
2331 |
7727 |
9676 |
|
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