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: 2025-09-25

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

Model vs. observations, sea ice class contingency tables

Date: 2025-09-19:

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 12073 4689 28 15 0 0 0 0
OW 1 1159 196 240 13 0 0 0
VODI 0 187 161 883 398 73 0 0
ODI 0 29 18 181 504 457 19 0
CDI 0 5 7 82 450 4420 1990 0
VCDI 0 0 0 2 33 2065 1704 0
...date precedes bulletin

Date: 2025-09-21:

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 12260 4534 22 0 0 0 0 0
OW 1 1051 197 290 33 0 0 0
VODI 0 198 119 692 523 163 0 0
ODI 0 42 17 142 369 584 97 0
CDI 0 7 4 44 214 1609 2128 0
VCDI 0 0 0 0 0 1020 5722 0
...date precedes bulletin

Date: 2025-09-23:

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 11714 5247 58 15 0 0 0 0
OW 1 489 245 358 27 0 0 0
VODI 0 3 39 519 430 45 2 0
ODI 0 0 0 102 493 284 15 0
CDI 0 0 0 1 206 1156 465 0
VCDI 0 0 0 0 7 524 7491 2146
...date precedes bulletin

Date: 2025-09-25:

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 11428 5282 78 13 0 0 0 0
OW 1 353 201 416 87 1 0 0
VODI 0 9 35 260 536 89 3 0
ODI 0 0 0 39 508 320 17 0
CDI 0 0 0 1 230 936 451 0
VCDI 0 0 0 0 16 615 7721 2436
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 11428 5363 140 53 0 0 0 0
OW 1 274 139 411 109 2 0 0
VODI 0 7 35 239 559 102 6 0
ODI 0 0 0 26 461 352 20 0
CDI 0 0 0 0 216 900 419 0
VCDI 0 0 0 0 32 605 7747 2436

Date: 2025-09-27:

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 11219 5091 50 31 0 0 0 0
OW 1 509 172 257 136 11 0 0
VODI 0 58 39 233 414 234 19 0
ODI 0 4 11 41 267 385 105 0
CDI 0 0 3 17 117 810 623 0
VCDI 0 0 0 0 5 857 7951 2412
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 11219 5183 82 72 5 0 0 0
OW 1 411 142 240 173 24 0 0
VODI 0 64 40 201 396 252 14 0
ODI 0 4 8 48 234 423 117 0
CDI 0 0 3 18 126 789 649 0
VCDI 0 0 0 0 5 809 7918 2412

Date: 2025-09-29:

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 10965 5536 38 9 0 0 0 0
OW 1 657 238 224 2 0 0 0
VODI 0 12 37 400 270 0 0 0
ODI 0 0 0 37 487 87 0 0
CDI 0 0 0 0 205 1349 64 0
VCDI 0 0 0 0 10 1368 9706 380
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 10965 5202 50 32 3 0 0 0
OW 1 736 114 194 87 11 0 0
VODI 0 224 107 247 313 191 36 0
ODI 0 43 40 126 212 278 105 0
CDI 0 0 2 71 327 756 424 0
VCDI 0 0 0 0 32 1568 9205 380

Date: 2025-10-01:

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 11231 5611 87 16 0 0 0 0
OW 1 490 198 227 14 0 0 0
VODI 0 41 89 326 244 20 0 0
ODI 0 0 4 113 288 129 3 0
CDI 0 0 0 11 324 847 164 0
VCDI 0 0 0 0 32 2268 8400 904
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 11231 4845 104 48 4 0 0 0
OW 1 810 123 202 94 27 0 0
VODI 0 332 83 219 265 172 30 0
ODI 0 104 35 103 191 372 68 0
CDI 0 49 24 93 198 872 428 0
VCDI 0 2 9 28 150 1821 8041 904

Date: 2025-10-03:

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 10037 6414 79 27 1 0 0 0
OW 1 541 216 293 40 0 0 0
VODI 0 45 81 351 318 32 0 0
ODI 0 1 7 84 244 239 6 0
CDI 0 0 0 23 163 818 241 0
VCDI 0 0 0 1 25 1428 7235 3091
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 10037 5949 114 125 53 27 0 0
OW 1 669 112 217 124 88 35 0
VODI 0 301 79 171 189 282 125 0
ODI 0 68 54 106 169 366 166 0
CDI 0 14 24 132 180 670 546 0
VCDI 0 0 0 28 76 1084 6610 3091


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