Description of algorithm
Full domain
American sector
European sector
Asian sector
  Ice concntr, edge pos
  Contingency tables

Validation of sea ice concentration - Asian sector

Bulletin date: 2025-05-08

Data source: OSI SAF N.H. AMSR sea ice concentration

Model vs. observations, sea ice class contingency tables

Date: 2025-05-02:

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 0 218 5 3 2 0 0 0
OW 0 192 18 37 27 6 1 18
VODI 0 60 39 113 45 4 11 55
ODI 0 16 25 92 135 25 27 50
CDI 0 6 22 135 339 506 260 81
VCDI 0 1 7 103 726 2450 12442 13780
...date precedes bulletin

Date: 2025-05-04:

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 0 237 5 3 0 1 0 0
OW 0 254 9 18 15 36 4 2
VODI 0 198 34 53 71 31 10 70
ODI 0 92 48 82 99 39 28 56
CDI 0 31 38 174 534 482 245 107
VCDI 0 17 18 86 697 3637 10014 14507
...date precedes bulletin

Date: 2025-05-06:

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 0 403 7 6 0 0 0 0
OW 0 351 38 42 9 2 1 0
VODI 0 116 68 121 71 22 6 9
ODI 0 22 25 191 210 61 21 21
CDI 0 33 20 267 810 1347 458 118
VCDI 0 8 4 66 434 1939 10238 14517
...date precedes bulletin

Date: 2025-05-08:

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 0 432 2 3 1 0 0 0
OW 1 349 21 15 11 4 2 10
VODI 12 125 96 209 93 2 15 29
ODI 0 48 47 200 176 34 25 56
CDI 0 35 61 250 864 875 406 149
VCDI 0 11 16 125 652 2409 11375 12836
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 0 434 2 4 4 0 0 0
OW 1 352 28 32 11 5 2 15
VODI 12 120 89 209 101 2 16 28
ODI 0 48 47 181 171 27 26 94
CDI 0 33 61 242 873 946 400 108
VCDI 0 13 16 134 637 2344 11379 12835

Date: 2025-05-10:

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 0 382 5 12 3 0 0 10
OW 16 300 24 43 15 5 5 30
VODI 3 204 81 156 86 6 30 67
ODI 0 81 51 179 136 38 70 86
CDI 0 169 95 329 597 943 652 71
VCDI 0 81 64 225 456 2418 11137 12721
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 0 391 4 16 6 2 0 20
OW 16 288 24 57 17 4 9 31
VODI 3 224 84 137 86 4 28 62
ODI 0 64 48 179 138 42 70 83
CDI 0 164 88 291 565 1142 579 72
VCDI 0 86 72 264 481 2216 11208 12717

Date: 2025-05-12:

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 22 469 0 14 1 1 0 3
OW 21 424 37 43 16 3 7 15
VODI 0 235 175 339 120 7 15 32
ODI 0 55 40 249 489 64 32 67
CDI 0 21 25 124 701 1860 565 84
VCDI 0 26 14 39 124 1749 13152 10603
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 20 393 0 20 1 0 2 66
OW 23 215 25 56 26 5 6 47
VODI 0 219 86 143 93 8 60 49
ODI 0 97 42 130 218 52 126 61
CDI 0 237 84 280 726 1266 825 30
VCDI 0 69 54 179 387 2353 12752 10551

Date: 2025-05-14:

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 7 565 8 4 1 0 8 0
OW 0 420 72 53 20 5 27 0
VODI 0 291 126 280 97 6 83 0
ODI 0 100 59 263 303 60 145 0
CDI 0 43 52 268 897 2043 1087 67
VCDI 0 10 16 40 200 2622 15794 5940
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 7 503 6 5 1 0 85 0
OW 0 181 44 57 27 3 47 0
VODI 0 274 60 119 67 12 124 0
ODI 0 116 76 204 211 58 218 5
CDI 0 289 93 388 795 1782 941 24
VCDI 0 66 54 135 417 2881 15729 5978

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 16 613 13 10 0 0 0 17
OW 0 473 51 49 17 2 5 31
VODI 0 411 114 156 68 4 37 59
ODI 0 205 86 290 257 25 185 48
CDI 0 92 87 496 841 1978 965 31
VCDI 0 17 16 48 286 2365 16929 4689
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 16 595 15 4 0 0 1 103
OW 0 199 38 70 16 0 19 29
VODI 0 357 43 75 61 8 115 20
ODI 0 177 85 238 227 24 257 16
CDI 0 356 120 422 733 1972 1035 17
VCDI 0 127 66 240 432 2370 16694 4690


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