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

Validation of sea ice concentration - Full domain

Bulletin date: 2025-04-17

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

Model vs. observations, sea ice class contingency tables

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 58558 13962 215 198 38 8 2 0
OW 630 1102 240 539 269 49 8 0
VODI 1851 341 180 552 590 184 44 0
ODI 1735 127 70 300 665 549 91 1
CDI 0 87 85 323 910 2204 1161 16
VCDI 0 31 52 268 682 5606 34160 52127
...date precedes bulletin

Date: 2025-04-13:

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 58072 14309 175 190 64 10 0 0
OW 629 1087 299 547 231 42 12 0
VODI 1852 289 160 552 573 252 28 0
ODI 1734 117 64 252 684 681 224 0
CDI 0 84 67 306 877 2306 1905 20
VCDI 0 43 41 201 627 4289 39098 47817
...date precedes bulletin

Date: 2025-04-15:

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 57986 14944 202 231 52 4 0 0
OW 655 916 324 481 207 48 1 0
VODI 1865 223 184 670 606 205 31 0
ODI 1720 51 53 310 895 725 139 0
CDI 0 30 37 369 1016 2819 2082 7
VCDI 0 7 14 92 455 3767 37658 48729
...date precedes bulletin

Date: 2025-04-17:

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 58568 14423 206 227 54 13 0 0
OW 651 1001 272 430 224 89 0 0
VODI 1874 333 176 536 522 341 55 0
ODI 1710 73 84 382 733 744 227 5
CDI 0 16 7 198 894 2653 2256 52
VCDI 0 11 2 82 530 3776 37407 48973
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 58569 14400 212 224 64 12 0 0
OW 650 1011 268 426 214 83 1 0
VODI 1881 347 179 549 544 345 52 0
ODI 1703 73 80 390 741 799 239 5
CDI 0 20 6 199 864 2607 2684 56
VCDI 0 6 2 67 530 3770 36969 48969

Date: 2025-04-19:

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 58195 14441 230 258 58 16 0 0
OW 674 1100 226 426 262 102 2 0
VODI 1886 422 237 614 545 377 101 3
ODI 1696 43 80 431 594 817 313 8
CDI 0 16 13 201 958 2199 2713 89
VCDI 0 9 9 90 547 3544 38086 48179
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 58192 14432 228 275 63 14 0 0
OW 678 1096 236 422 263 113 2 0
VODI 1890 437 223 613 548 378 110 1
ODI 1691 41 87 420 665 851 345 10
CDI 0 17 10 195 875 2259 2975 108
VCDI 0 8 11 95 550 3440 37783 48160

Date: 2025-04-21:

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 58091 14778 270 292 79 29 0 0
OW 684 1190 284 503 246 60 0 0
VODI 1904 187 222 780 762 333 32 1
ODI 1669 4 26 267 792 857 196 2
CDI 0 0 6 80 632 2577 2027 59
VCDI 0 0 1 38 258 3249 39811 47532
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 58091 14462 254 289 91 17 0 0
OW 683 1158 239 438 314 111 3 0
VODI 1899 504 232 615 571 423 102 0
ODI 1675 29 71 416 661 725 386 4
CDI 0 6 13 163 700 2125 2976 95
VCDI 0 0 0 39 432 3704 38599 47495

Date: 2025-04-23:

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 58908 13954 285 248 111 36 0 0
OW 778 1090 289 460 225 79 6 0
VODI 1932 147 220 671 667 359 45 3
ODI 1657 7 18 303 700 837 272 23
CDI 0 3 4 124 458 2396 4020 85
VCDI 0 0 0 67 499 2496 38288 48040
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 58903 13590 264 258 104 19 0 0
OW 779 1151 226 375 292 125 13 0
VODI 1927 417 264 582 542 439 173 7
ODI 1663 35 56 423 639 738 520 28
CDI 3 8 6 156 516 2201 4847 108
VCDI 0 0 0 79 567 2681 37078 48008

Date: 2025-04-25:

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 59528 13305 206 180 43 4 0 0
OW 799 1282 291 503 280 49 8 0
VODI 1941 327 242 659 673 369 76 0
ODI 1630 21 41 380 732 866 422 7
CDI 0 3 11 158 632 2948 3779 61
VCDI 0 0 0 77 632 2785 37291 47569
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 59522 12890 214 296 95 21 0 0
OW 799 1264 203 334 308 171 38 0
VODI 1937 513 234 560 573 463 279 11
ODI 1638 209 85 333 522 707 611 23
CDI 2 62 53 317 818 2688 4370 76
VCDI 0 0 2 117 676 2971 36278 47527


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