Validation of sea ice concentration - American sector
Bulletin date: 2025-04-03
Data source: OSI SAF N.H. AMSR sea ice concentration
Model vs. observations, sea ice class contingency tables
Date: 2025-03-28:
| 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 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
| VODI |
0 |
0 |
0 |
0 |
0 |
2 |
0 |
0 |
| ODI |
0 |
0 |
0 |
0 |
0 |
23 |
1 |
0 |
| CDI |
0 |
0 |
2 |
7 |
5 |
59 |
68 |
7 |
| VCDI |
0 |
0 |
0 |
25 |
42 |
1488 |
13176 |
30961 |
|
...date precedes bulletin
|
Date: 2025-03-30:
| 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 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
| VODI |
0 |
0 |
0 |
0 |
0 |
2 |
0 |
0 |
| ODI |
0 |
0 |
0 |
0 |
5 |
21 |
1 |
0 |
| CDI |
0 |
0 |
4 |
4 |
14 |
78 |
88 |
10 |
| VCDI |
0 |
0 |
4 |
18 |
66 |
1633 |
17502 |
26416 |
|
...date precedes bulletin
|
Date: 2025-04-01:
| 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 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
| VODI |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
| ODI |
0 |
0 |
0 |
0 |
0 |
5 |
0 |
0 |
| CDI |
0 |
0 |
0 |
16 |
13 |
56 |
53 |
0 |
| VCDI |
0 |
0 |
0 |
9 |
59 |
1559 |
17678 |
26418 |
|
...date precedes bulletin
|
Date: 2025-04-03:
| 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 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
| VODI |
0 |
0 |
0 |
0 |
0 |
1 |
1 |
0 |
| ODI |
0 |
0 |
0 |
0 |
2 |
19 |
14 |
0 |
| CDI |
0 |
0 |
0 |
0 |
1 |
49 |
92 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
65 |
1329 |
12974 |
31319 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
| VODI |
0 |
0 |
0 |
0 |
0 |
1 |
1 |
0 |
| ODI |
0 |
0 |
0 |
0 |
2 |
18 |
15 |
0 |
| CDI |
0 |
0 |
0 |
0 |
1 |
59 |
92 |
0 |
| VCDI |
0 |
0 |
0 |
0 |
65 |
1320 |
12973 |
31319 |
|
Date: 2025-04-05:
| 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 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
| VODI |
0 |
0 |
0 |
0 |
0 |
1 |
0 |
0 |
| ODI |
0 |
0 |
0 |
0 |
3 |
16 |
33 |
0 |
| CDI |
0 |
0 |
0 |
0 |
16 |
154 |
208 |
13 |
| VCDI |
0 |
0 |
0 |
0 |
58 |
1048 |
12966 |
31350 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
| VODI |
0 |
0 |
0 |
0 |
0 |
0 |
1 |
0 |
| ODI |
0 |
0 |
0 |
0 |
3 |
18 |
28 |
0 |
| CDI |
0 |
0 |
0 |
0 |
15 |
167 |
240 |
31 |
| VCDI |
0 |
0 |
0 |
0 |
59 |
1034 |
12938 |
31332 |
|
Date: 2025-04-07:
| 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 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
| VODI |
0 |
0 |
0 |
1 |
16 |
11 |
2 |
1 |
| ODI |
0 |
0 |
0 |
6 |
24 |
31 |
23 |
4 |
| CDI |
0 |
0 |
1 |
12 |
92 |
244 |
140 |
16 |
| VCDI |
0 |
0 |
0 |
24 |
140 |
1192 |
12404 |
31482 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
0 |
0 |
0 |
4 |
0 |
0 |
0 |
| VODI |
0 |
0 |
0 |
0 |
12 |
7 |
2 |
0 |
| ODI |
0 |
0 |
0 |
3 |
20 |
31 |
24 |
4 |
| CDI |
0 |
0 |
1 |
8 |
62 |
168 |
186 |
7 |
| VCDI |
0 |
0 |
0 |
32 |
174 |
1272 |
12357 |
31492 |
|
Date: 2025-04-09:
| 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 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
0 |
0 |
4 |
1 |
0 |
0 |
0 |
| VODI |
0 |
0 |
9 |
30 |
8 |
6 |
5 |
0 |
| ODI |
0 |
3 |
5 |
22 |
25 |
18 |
12 |
0 |
| CDI |
0 |
2 |
6 |
33 |
79 |
144 |
187 |
7 |
| VCDI |
0 |
5 |
6 |
38 |
196 |
1230 |
11651 |
32134 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
0 |
0 |
2 |
2 |
0 |
1 |
0 |
| VODI |
0 |
0 |
3 |
24 |
3 |
7 |
9 |
1 |
| ODI |
0 |
1 |
7 |
19 |
13 |
10 |
11 |
16 |
| CDI |
0 |
2 |
6 |
31 |
74 |
128 |
181 |
76 |
| VCDI |
0 |
7 |
10 |
51 |
217 |
1253 |
11653 |
32048 |
|
Date: 2025-04-11:
| 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 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
0 |
0 |
1 |
3 |
0 |
0 |
0 |
| VODI |
0 |
6 |
5 |
16 |
16 |
3 |
5 |
0 |
| ODI |
0 |
11 |
12 |
19 |
24 |
16 |
20 |
1 |
| CDI |
0 |
9 |
36 |
114 |
77 |
118 |
312 |
13 |
| VCDI |
0 |
1 |
29 |
107 |
216 |
1322 |
14027 |
29327 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
| OW |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
0 |
| VODI |
0 |
0 |
0 |
0 |
1 |
0 |
30 |
2 |
| ODI |
0 |
7 |
5 |
14 |
9 |
16 |
50 |
30 |
| CDI |
0 |
14 |
36 |
47 |
47 |
38 |
347 |
67 |
| VCDI |
0 |
6 |
41 |
196 |
279 |
1405 |
13937 |
29242 |
|
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