Validation of sea ice concentration
Bulletin date: 2021-04-22
Model vs. observations, sea ice class contingency tables
Date: 2021-04-16:
| 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 |
12924 |
5940 |
1264 |
600 |
294 |
100 |
51 |
0 |
| OW |
0 |
33 |
202 |
209 |
153 |
80 |
34 |
0 |
| VODI |
0 |
3 |
156 |
233 |
216 |
142 |
77 |
0 |
| ODI |
0 |
0 |
46 |
252 |
194 |
168 |
134 |
0 |
| CDI |
0 |
0 |
22 |
219 |
211 |
226 |
619 |
2 |
| VCDI |
0 |
0 |
20 |
217 |
324 |
1019 |
7609 |
4166 |
|
...date precedes bulletin
|
Date: 2021-04-20:
| 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 |
13399 |
6207 |
1406 |
751 |
248 |
46 |
47 |
0 |
| OW |
0 |
12 |
123 |
243 |
113 |
50 |
45 |
0 |
| VODI |
0 |
1 |
88 |
222 |
190 |
70 |
60 |
0 |
| ODI |
0 |
0 |
31 |
159 |
135 |
142 |
138 |
11 |
| CDI |
0 |
0 |
12 |
113 |
198 |
218 |
828 |
90 |
| VCDI |
0 |
0 |
14 |
151 |
220 |
465 |
6639 |
5274 |
|
...date precedes bulletin
|
Date: 2021-04-22:
| 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 |
13515 |
6121 |
1400 |
618 |
283 |
99 |
64 |
0 |
| OW |
0 |
22 |
173 |
236 |
152 |
54 |
64 |
0 |
| VODI |
0 |
4 |
93 |
223 |
210 |
104 |
99 |
0 |
| ODI |
0 |
0 |
35 |
118 |
145 |
134 |
161 |
1 |
| CDI |
0 |
0 |
23 |
99 |
185 |
268 |
940 |
18 |
| VCDI |
0 |
0 |
9 |
126 |
200 |
411 |
7122 |
4630 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
13515 |
6123 |
1436 |
657 |
315 |
120 |
73 |
0 |
| OW |
0 |
18 |
143 |
201 |
118 |
39 |
55 |
0 |
| VODI |
0 |
6 |
84 |
219 |
209 |
113 |
103 |
0 |
| ODI |
0 |
0 |
39 |
115 |
152 |
118 |
167 |
2 |
| CDI |
0 |
0 |
23 |
105 |
188 |
273 |
930 |
20 |
| VCDI |
0 |
0 |
8 |
123 |
193 |
407 |
7122 |
4627 |
|
Date: 2021-04-26:
| 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 |
13183 |
6133 |
1402 |
578 |
362 |
161 |
54 |
0 |
| OW |
0 |
3 |
219 |
203 |
170 |
72 |
29 |
0 |
| VODI |
0 |
0 |
146 |
219 |
242 |
103 |
85 |
0 |
| ODI |
0 |
0 |
28 |
137 |
241 |
230 |
208 |
0 |
| CDI |
0 |
0 |
8 |
60 |
196 |
446 |
1356 |
3 |
| VCDI |
0 |
0 |
27 |
48 |
84 |
244 |
6706 |
4773 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
13183 |
6134 |
1382 |
569 |
445 |
209 |
80 |
0 |
| OW |
0 |
2 |
206 |
203 |
173 |
58 |
40 |
0 |
| VODI |
0 |
0 |
137 |
151 |
185 |
130 |
117 |
0 |
| ODI |
0 |
0 |
58 |
150 |
160 |
194 |
246 |
0 |
| CDI |
0 |
0 |
19 |
121 |
220 |
380 |
1445 |
6 |
| VCDI |
0 |
0 |
28 |
51 |
112 |
285 |
6510 |
4770 |
|
Date: 2021-04-28:
| 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 |
12944 |
6042 |
1355 |
846 |
311 |
205 |
76 |
0 |
| OW |
0 |
0 |
100 |
293 |
150 |
107 |
51 |
0 |
| VODI |
0 |
0 |
74 |
209 |
194 |
123 |
103 |
0 |
| ODI |
0 |
0 |
22 |
154 |
176 |
211 |
203 |
2 |
| CDI |
0 |
0 |
2 |
129 |
183 |
517 |
1347 |
28 |
| VCDI |
0 |
0 |
6 |
89 |
81 |
491 |
6426 |
4909 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
12944 |
6022 |
1302 |
808 |
347 |
293 |
116 |
0 |
| OW |
0 |
19 |
140 |
234 |
165 |
84 |
50 |
0 |
| VODI |
0 |
1 |
64 |
197 |
150 |
138 |
155 |
0 |
| ODI |
0 |
0 |
28 |
160 |
119 |
182 |
244 |
1 |
| CDI |
0 |
0 |
19 |
219 |
189 |
398 |
1165 |
27 |
| VCDI |
0 |
0 |
6 |
102 |
125 |
559 |
6476 |
4911 |
|
Date: 2021-04-30:
| 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 |
12741 |
6336 |
1167 |
801 |
301 |
220 |
126 |
0 |
| OW |
0 |
11 |
113 |
288 |
171 |
104 |
71 |
0 |
| VODI |
0 |
0 |
60 |
236 |
146 |
118 |
137 |
0 |
| ODI |
0 |
0 |
16 |
137 |
136 |
161 |
259 |
1 |
| CDI |
0 |
3 |
5 |
109 |
196 |
361 |
1519 |
11 |
| VCDI |
0 |
3 |
7 |
70 |
107 |
522 |
6724 |
4665 |
|
|
observations |
|
Ice free |
Ice free
near MIZ |
OW |
VODI |
ODI |
CDI |
VCDI
near MIZ |
VCDI |
m
o
d
e
l |
Ice free |
12741 |
6293 |
1100 |
801 |
358 |
295 |
180 |
0 |
| OW |
0 |
44 |
141 |
220 |
145 |
91 |
66 |
0 |
| VODI |
0 |
10 |
58 |
183 |
119 |
138 |
183 |
0 |
| ODI |
0 |
0 |
25 |
142 |
99 |
129 |
291 |
7 |
| CDI |
0 |
5 |
22 |
160 |
175 |
289 |
1017 |
47 |
| VCDI |
0 |
1 |
22 |
135 |
161 |
544 |
7099 |
4623 |
|
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