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: 2025-06-26

Model: GLO MFC - NEMO

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

Model vs. observations, sea ice class contingency tables

Date: 2025-06-20:

Best estimate
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 367 4441 234 303 43 0 0 0
OW 0 500 126 299 242 1 0 0
VODI 0 245 56 451 1739 93 7 0
ODI 0 356 85 285 1150 693 99 0
CDI 0 38 27 134 1564 9995 2648 3
VCDI 0 0 0 0 560 4065 14168 835

Date: 2025-06-22:

Best estimate
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 631 4789 197 277 29 0 0 0
OW 0 549 99 330 223 8 0 0
VODI 0 231 57 329 1687 321 7 0
ODI 0 310 70 329 769 922 67 0
CDI 0 30 28 131 2001 11807 1396 0
VCDI 0 0 0 0 198 3065 10130 4835

Date: 2025-06-24:

Best estimate
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 936 4951 160 311 40 0 0 0
OW 0 604 97 383 169 12 0 0
VODI 0 233 63 386 1054 150 6 0
ODI 0 259 74 366 1929 470 64 0
CDI 0 21 17 125 3079 11834 1259 0
VCDI 0 0 0 3 1880 4998 8409 1510

Date: 2025-06-26:

Best estimate
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 1572 4920 195 336 38 0 0 0
OW 0 585 143 502 111 9 0 0
VODI 0 226 86 752 1152 243 8 0
ODI 0 205 58 395 1269 552 69 0
CDI 0 9 14 130 2187 14665 886 4
VCDI 0 0 0 7 253 6590 5314 2367

Date: 2025-06-28:

Best estimate
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 1923 5334 200 402 36 0 0 0
OW 0 638 214 608 77 6 0 0
VODI 0 418 162 1559 972 110 29 0
ODI 0 148 61 197 758 733 81 0
CDI 0 2 7 49 2512 16162 333 0
VCDI 0 0 0 5 199 5125 5046 1746

Date: 2025-06-30:

Best estimate
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 2451 5206 329 549 30 0 0 0
OW 0 918 323 1104 181 7 0 0
VODI 0 249 129 869 936 145 35 0
ODI 0 120 51 200 1062 1011 126 0
CDI 0 0 7 96 3986 15106 484 0
VCDI 0 0 0 0 96 4958 3974 1114

Date: 2025-07-02:

Best estimate
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 2764 5531 394 448 18 0 0 0
OW 0 1165 358 1074 313 4 0 0
VODI 0 252 86 623 1045 126 6 0
ODI 0 58 59 187 1243 1429 79 0
CDI 0 1 3 56 4536 15534 283 0
VCDI 0 0 0 0 25 2904 4745 503

Date: 2025-07-04:

Best estimate
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 2892 6491 464 344 31 0 0 0
OW 0 1261 238 861 345 9 0 0
VODI 0 224 78 400 1070 415 21 0
ODI 0 35 39 176 1295 1547 101 0
CDI 0 1 5 43 6081 13976 345 0
VCDI 0 0 0 0 72 2341 4650 1


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