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

Validation of sea ice concentration - European sector

Reference date: 2025-04-24

Model: GLO MFC - NEMO

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

Model vs. observations, sea ice class contingency tables

Date: 2025-04-18:

Best estimate
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 67085 15571 439 417 23 0 0 0
OW 0 312 111 481 70 0 0 0
VODI 0 370 212 872 584 34 0 0
ODI 0 8 40 549 1512 595 19 0
CDI 0 0 0 12 662 2908 1331 7
VCDI 0 0 0 0 10 606 7490 6763

Date: 2025-04-20:

Best estimate
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 66284 16177 519 622 33 0 0 0
OW 0 283 123 603 100 1 0 0
VODI 0 335 145 809 673 39 0 0
ODI 0 25 73 551 1426 529 17 0
CDI 0 0 0 8 771 2388 1237 24
VCDI 0 0 0 0 9 836 7904 6549

Date: 2025-04-22:

Best estimate
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 66914 15901 544 660 26 0 0 0
OW 0 217 140 579 94 0 0 0
VODI 0 229 123 690 660 24 2 0
ODI 0 13 42 474 1411 575 115 0
CDI 0 0 0 5 442 2355 1576 30
VCDI 0 0 0 0 1 578 7940 6733

Date: 2025-04-24:

Best estimate
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 67158 15533 559 748 13 0 0 0
OW 0 228 113 519 58 0 0 0
VODI 0 215 152 838 586 56 27 0
ODI 0 12 35 454 1416 686 152 0
CDI 0 0 0 2 470 2349 1513 39
VCDI 0 0 0 0 0 605 7754 6803

Date: 2025-04-26:

Best estimate
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 67426 15589 513 379 0 0 0 0
OW 0 234 138 492 62 0 0 0
VODI 0 265 150 949 517 48 14 0
ODI 0 25 42 451 1489 537 124 0
CDI 0 0 0 49 608 2999 1372 20
VCDI 0 0 0 0 5 851 7437 6308

Date: 2025-04-28:

Best estimate
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 68808 14523 362 227 2 0 0 0
OW 0 343 201 380 68 0 0 0
VODI 0 305 198 986 265 28 1 0
ODI 0 39 61 685 1474 283 26 0
CDI 0 0 0 110 858 3360 1355 0
VCDI 0 0 0 0 1 1069 6982 6093

Date: 2025-04-30:

Best estimate
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 68461 14769 383 243 6 0 0 0
OW 0 300 169 417 37 0 0 0
VODI 0 290 181 1065 239 9 3 0
ODI 0 50 74 690 1747 332 31 0
CDI 0 0 0 86 908 3742 1387 2
VCDI 0 0 0 0 21 762 6983 5706

Date: 2025-05-02:

Best estimate
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 69805 13452 327 230 1 0 0 0
OW 17 273 140 328 34 0 0 0
VODI 0 313 219 1092 320 34 4 0
ODI 0 63 82 702 1788 560 82 0
CDI 0 0 0 91 966 4089 1199 0
VCDI 0 0 0 0 9 1037 6772 5064


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