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

Validation of sea ice concentration - American sector

Bulletin date: 2025-05-29

Data source: OSI SAF N.H. multi-product sea ice concentration

Model vs. observations, sea ice class contingency tables

Date: 2025-05-23:

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 8994 2864 84 127 14 4 0 0
OW 48 986 152 283 70 19 1 0
VODI 0 112 129 927 491 86 6 0
ODI 0 8 1 342 550 246 24 0
CDI 0 0 0 234 858 1745 393 129
VCDI 0 0 0 31 340 2622 14156 24155
...date precedes bulletin

Date: 2025-05-25:

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 9175 2896 86 121 22 3 0 0
OW 0 909 149 338 120 19 0 0
VODI 0 266 171 815 535 117 3 0
ODI 0 32 36 296 524 253 31 0
CDI 0 7 10 254 819 1705 424 13
VCDI 0 0 0 37 381 4157 16502 20005
...date precedes bulletin

Date: 2025-05-27:

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 9302 3215 64 109 14 4 0 0
OW 0 907 238 429 89 14 0 0
VODI 0 81 101 1065 533 50 0 0
ODI 0 18 4 222 761 140 19 0
CDI 0 17 3 151 1328 2026 541 18
VCDI 0 5 0 14 460 5958 18523 14808
...date precedes bulletin

Date: 2025-05-29:

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 9675 2879 89 87 12 5 1 0
OW 3 1138 139 330 129 6 0 0
VODI 1 306 178 803 519 69 11 0
ODI 0 22 14 275 727 173 49 0
CDI 0 10 4 236 1713 2326 1430 12
VCDI 0 3 0 132 1056 4018 18001 14650
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 9671 2970 113 112 17 4 1 0
OW 7 1092 110 318 125 3 0 0
VODI 1 264 191 798 485 66 9 0
ODI 0 19 6 290 774 158 41 0
CDI 0 10 4 204 1672 2342 1491 16
VCDI 0 3 0 141 1083 4024 17950 14646

Date: 2025-05-31:

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 10087 2484 87 53 5 3 0 0
OW 7 1453 136 325 59 5 0 0
VODI 0 423 149 796 466 60 9 0
ODI 0 42 35 279 780 249 48 0
CDI 0 0 0 272 1340 3396 2450 74
VCDI 0 0 0 117 740 4560 14657 15585
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 10075 2601 102 81 4 3 0 0
OW 19 1366 106 311 72 4 0 0
VODI 0 399 177 794 473 69 11 0
ODI 0 35 22 296 779 226 41 0
CDI 0 1 0 235 1320 3257 2321 75
VCDI 0 0 0 125 742 4714 14791 15584

Date: 2025-06-02:

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 10695 2215 117 148 8 4 0 0
OW 19 1357 92 462 98 17 0 0
VODI 10 461 115 653 466 76 8 0
ODI 0 47 10 372 786 209 32 9
CDI 0 5 11 316 1679 3029 2518 46
VCDI 0 0 0 9 1015 3853 13238 17026
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 10663 2121 101 103 5 4 0 0
OW 46 1419 105 441 80 15 0 0
VODI 15 498 118 763 492 67 6 0
ODI 0 42 14 363 892 231 37 10
CDI 0 5 7 281 1645 2656 2779 38
VCDI 0 0 0 9 938 4215 12974 17033

Date: 2025-06-04:

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 10463 2944 114 126 6 7 0 0
OW 1 1334 215 372 67 20 0 0
VODI 0 199 151 1043 424 94 0 0
ODI 0 5 10 499 1073 259 28 0
CDI 0 4 6 208 1581 4126 976 0
VCDI 0 0 1 27 482 4289 15200 14877
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 10464 2310 105 125 10 8 0 0
OW 0 1630 150 393 110 24 0 0
VODI 0 509 208 793 439 111 0 0
ODI 0 29 25 547 769 220 18 0
CDI 0 6 5 363 1715 3221 1905 9
VCDI 0 2 4 54 590 5211 14281 14868

Date: 2025-06-06:

Best estimate Forecast
...observations not yet available ...observations not yet available


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