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

Validation of sea ice concentration - American sector

Reference date: 2025-06-19

Model: GLO MFC - NEMO

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

Model vs. observations, sea ice class contingency tables

Date: 2025-06-13:

Best estimate
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 0 2335 231 324 66 1 0 0
OW 0 429 122 291 62 4 0 0
VODI 0 304 108 435 659 915 52 0
ODI 0 464 154 527 1152 1048 169 0
CDI 0 133 40 189 1237 4688 1101 0
VCDI 0 0 0 2 834 6322 13120 8341

Date: 2025-06-15:

Best estimate
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 0 2998 303 358 55 1 0 0
OW 0 501 109 276 121 4 0 0
VODI 0 292 118 467 790 722 3 0
ODI 0 385 142 403 988 1814 141 0
CDI 0 121 20 118 1827 6202 1354 0
VCDI 0 0 0 0 1823 7200 13017 3186

Date: 2025-06-17:

Best estimate
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 20 3792 307 362 57 0 0 0
OW 0 548 113 277 146 4 0 0
VODI 0 216 80 395 750 426 2 0
ODI 0 346 109 324 1201 1995 63 0
CDI 0 94 18 95 1587 6747 3184 0
VCDI 0 0 0 1 778 2980 12592 6250

Date: 2025-06-19:

Best estimate
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 111 4369 248 289 41 1 0 0
OW 1 561 125 313 219 5 0 0
VODI 0 263 66 368 1148 505 1 0
ODI 0 360 71 247 1135 1232 35 0
CDI 0 54 29 124 940 8832 3593 2
VCDI 0 0 0 1 1005 3241 13871 2453

Date: 2025-06-21:

Best estimate
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 464 4587 237 320 54 0 0 0
OW 0 564 100 235 231 0 0 0
VODI 0 288 82 331 1843 325 2 0
ODI 0 409 107 438 901 453 28 0
CDI 0 27 24 129 2511 10422 1918 0
VCDI 0 0 0 0 643 3493 11704 2989

Date: 2025-06-23:

Best estimate
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 725 4916 186 298 71 1 0 0
OW 0 587 74 370 190 16 0 0
VODI 0 226 52 268 1112 601 8 0
ODI 0 289 84 419 688 1266 54 0
CDI 0 20 18 175 1923 12770 996 3
VCDI 0 0 0 1 329 4446 7290 5387

Date: 2025-06-25:

Best estimate
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 1401 4785 184 280 54 0 0 0
OW 0 594 122 443 112 11 0 0
VODI 0 231 77 488 993 170 4 0
ODI 0 208 59 365 1809 587 57 0
CDI 0 23 18 109 2885 12985 772 0
VCDI 0 0 0 2 2286 5376 7034 1335

Date: 2025-06-27:

Best estimate
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 1703 5263 198 282 35 0 0 0
OW 0 630 179 534 81 8 0 0
VODI 0 230 72 1512 1313 83 15 0
ODI 0 187 65 248 747 549 88 0
CDI 0 8 9 108 2603 15256 639 0
VCDI 0 0 0 7 145 5872 4960 2230


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