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

Validation of sea ice concentration - GODAE regions

Bulletin date: 2025-03-06

Model: ARC-MFC PHYS (TOPAZ)

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

Model vs. observations, sea ice class contingency tables

Date: 2025-03-10

Best estimate

Forecast

Arctic Deep Basin:

observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 0 146 39 66 7 0 0 0
OW 0 2 7 66 23 0 0 0
VODI 0 0 1 35 84 6 0 0
ODI 0 0 0 6 72 56 6 0
CDI 0 0 0 0 20 258 59 0
VCDI 0 0 0 0 0 627 4853 30463
observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 0 144 44 89 10 0 0 0
OW 0 4 3 58 53 0 0 0
VODI 0 0 0 24 79 36 0 0
ODI 0 0 0 2 47 88 1 0
CDI 0 0 0 0 17 198 158 0
VCDI 0 0 0 0 0 625 4759 30463

Queen Elisabeth Islands:

observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 0 0 0 0 0 0 0 0
OW 0 0 0 0 0 0 0 0
VODI 0 0 0 0 0 0 0 0
ODI 0 0 0 0 0 0 0 0
CDI 0 0 0 0 0 0 0 0
VCDI 0 0 0 0 0 9 568 2542
observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 0 0 0 0 0 0 0 0
OW 0 0 0 0 0 0 0 0
VODI 0 0 0 0 0 0 0 0
ODI 0 0 0 0 0 0 0 0
CDI 0 0 0 0 0 0 0 0
VCDI 0 0 0 0 0 9 568 2542

Beaufort Sea:

observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 0 0 0 0 0 0 0 0
OW 0 0 0 0 0 0 0 0
VODI 0 0 0 0 0 0 0 0
ODI 0 0 0 0 0 3 3 0
CDI 0 0 0 0 1 10 17 11
VCDI 0 0 0 7 76 198 2703 6949
observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 0 0 0 0 0 0 0 0
OW 0 0 0 0 0 0 0 0
VODI 0 0 0 0 0 0 0 0
ODI 0 0 0 0 0 3 1 0
CDI 0 0 0 0 1 10 24 19
VCDI 0 0 0 7 76 198 2698 6941

Chuckchi Sea:

observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 0 0 0 0 0 0 0 0
OW 0 0 0 0 0 0 0 0
VODI 0 0 0 0 0 0 0 0
ODI 0 0 0 0 0 0 0 0
CDI 0 0 0 0 0 0 0 0
VCDI 0 0 0 0 0 0 289 5364
observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 0 0 0 0 0 0 0 0
OW 0 0 0 0 0 0 0 0
VODI 0 0 0 0 0 0 0 0
ODI 0 0 0 0 0 0 0 0
CDI 0 0 0 0 0 0 0 0
VCDI 0 0 0 0 0 0 289 5364

Siberian Sea:

observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 0 0 0 0 0 0 0 0
OW 0 0 0 0 0 0 0 0
VODI 0 0 0 0 0 0 0 0
ODI 0 0 0 0 0 0 0 0
CDI 0 0 0 0 0 0 0 0
VCDI 0 0 0 0 0 0 0 7224
observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 0 0 0 0 0 0 0 0
OW 0 0 0 0 0 0 0 0
VODI 0 0 0 0 0 0 0 0
ODI 0 0 0 0 0 0 0 0
CDI 0 0 0 0 0 0 0 0
VCDI 0 0 0 0 0 0 0 7224

Laptev Sea:

observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 0 0 0 0 0 0 0 0
OW 0 0 0 0 0 0 0 0
VODI 0 0 0 0 0 0 0 0
ODI 0 0 0 0 0 0 0 0
CDI 0 0 0 0 0 0 0 8
VCDI 0 0 0 0 0 0 0 5291
observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 0 0 0 0 0 0 0 0
OW 0 0 0 0 0 0 0 0
VODI 0 0 0 0 0 0 0 0
ODI 0 0 0 0 0 0 0 0
CDI 0 0 0 0 0 0 0 9
VCDI 0 0 0 0 0 0 0 5290

Kara Sea:

observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 0 119 0 0 0 0 0 0
OW 0 123 16 1 0 0 0 0
VODI 0 40 12 30 2 0 0 0
ODI 0 0 7 21 12 0 1 0
CDI 0 0 0 35 31 25 9 3
VCDI 0 0 0 7 61 97 2100 3565
observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 0 80 0 0 0 0 0 0
OW 0 85 9 1 0 0 0 0
VODI 0 55 3 7 0 0 0 0
ODI 0 37 4 19 4 0 0 0
CDI 0 24 15 25 45 12 22 3
VCDI 0 1 4 42 57 110 2088 3565

Barents Sea:

observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 3388 4439 166 131 0 0 0 0
OW 0 182 114 306 7 0 0 0
VODI 0 28 21 445 128 0 0 0
ODI 0 2 1 105 368 16 0 0
CDI 0 0 0 27 226 174 6 0
VCDI 0 0 0 0 92 308 642 0
observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 3388 4356 169 146 0 0 0 0
OW 0 226 108 307 18 0 0 0
VODI 0 50 18 344 128 5 0 0
ODI 0 11 3 166 261 47 0 0
CDI 0 8 2 38 237 117 12 0
VCDI 0 0 2 13 177 329 636 0

Greenland Basin:

observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 4659 3333 98 127 43 0 0 0
OW 0 39 71 119 50 6 0 0
VODI 0 2 19 143 127 13 0 0
ODI 0 0 0 49 161 46 0 0
CDI 0 0 0 0 71 390 9 0
VCDI 0 0 0 0 0 1045 1076 0
observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 4659 3331 115 170 47 0 0 0
OW 0 41 58 122 61 3 0 0
VODI 0 2 15 108 110 27 0 0
ODI 0 0 0 38 119 45 0 0
CDI 0 0 0 0 105 309 7 0
VCDI 0 0 0 0 10 1116 1078 0

Southeast Greenland:

observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 7969 3232 88 95 2 0 0 0
OW 0 100 66 141 40 0 0 0
VODI 0 3 20 187 81 5 0 0
ODI 0 0 0 49 145 31 0 0
CDI 0 0 0 4 145 315 77 0
VCDI 0 0 0 0 8 162 22 0
observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 7969 3194 96 92 7 0 0 0
OW 0 121 47 121 32 0 0 0
VODI 0 20 31 168 70 11 0 0
ODI 0 0 0 71 139 32 0 0
CDI 0 0 0 24 152 212 75 0
VCDI 0 0 0 0 21 258 24 0

Baffin Bay:

observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 0 0 0 0 0 0 0 0
OW 0 0 0 0 2 0 0 0
VODI 0 0 0 5 5 0 0 0
ODI 0 0 0 17 5 1 0 0
CDI 0 0 0 67 49 43 8 0
VCDI 0 0 0 29 245 456 3040 1831
observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 0 0 0 0 0 0 0 0
OW 0 0 0 0 2 0 0 0
VODI 0 0 0 0 4 0 0 0
ODI 0 0 0 2 4 0 0 0
CDI 0 0 0 8 15 7 10 0
VCDI 0 0 0 108 281 493 3038 1831

Hudson Bay:

observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 0 0 0 0 0 0 0 0
OW 0 0 0 0 0 0 0 0
VODI 0 0 0 0 0 0 0 0
ODI 0 0 0 0 0 10 0 0
CDI 0 0 0 0 12 159 27 0
VCDI 0 0 0 0 3 320 2663 5344
observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 0 0 0 0 0 0 0 0
OW 0 0 0 0 0 0 0 0
VODI 0 0 0 0 0 3 0 0
ODI 0 0 0 0 3 10 8 0
CDI 0 0 0 0 11 52 31 0
VCDI 0 0 0 0 1 424 2651 5344

Labrador Sea:

observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 7603 2670 11 9 0 0 0 0
OW 30 686 111 83 11 0 0 0
VODI 0 110 87 286 83 5 0 0
ODI 0 0 8 132 325 121 0 0
CDI 0 0 0 63 387 858 188 0
VCDI 0 0 0 0 90 372 1417 0
observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 7622 2504 11 3 0 0 0 0
OW 11 455 31 45 13 0 0 0
VODI 0 233 53 143 39 31 0 0
ODI 0 129 41 140 229 95 0 0
CDI 0 132 60 120 336 606 99 0
VCDI 0 13 21 122 279 624 1506 0


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