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: 2025-02-20

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: 2025-02-24

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 0 166 0 0 0 0 0 0
OW 0 70 48 34 2 0 0 0
VODI 0 0 7 115 56 1 0 0
ODI 0 0 0 33 102 30 0 0
CDI 0 0 0 14 170 451 24 0
VCDI 0 0 0 3 45 974 5878 28679
observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 0 110 1 0 0 0 0 0
OW 0 86 14 25 2 0 0 0
VODI 0 37 24 66 34 2 0 0
ODI 0 3 16 46 109 21 0 0
CDI 0 0 0 62 176 305 32 0
VCDI 0 0 0 0 54 1128 5870 28679

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 0 0 3119
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 3119

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 0 0 0
CDI 0 0 0 0 0 0 0 6
VCDI 0 0 0 0 0 0 400 9572
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 0 400 9578

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 1 0 0 0
CDI 0 0 0 0 8 1 0 0
VCDI 0 0 0 0 85 267 2260 3031
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 4 2 0 0
VCDI 0 0 0 0 90 266 2260 3031

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 1 1 0
VCDI 0 0 0 0 0 8 785 6429
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 1 2 0
VCDI 0 0 0 0 0 8 784 6429

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 11
VCDI 0 0 0 0 0 0 0 5288
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 6
VCDI 0 0 0 0 0 0 0 5293

Kara Sea:

observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 0 116 0 0 0 0 0 0
OW 0 93 6 1 0 0 0 0
VODI 0 36 11 14 2 0 0 0
ODI 0 8 9 17 34 0 0 0
CDI 0 0 4 23 170 141 3 0
VCDI 0 0 0 32 119 745 4495 238
observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 0 113 3 0 0 0 0 0
OW 0 37 3 5 0 0 0 0
VODI 0 30 1 12 7 0 0 0
ODI 0 29 2 7 44 0 0 0
CDI 0 42 17 8 119 87 12 0
VCDI 0 2 4 55 155 799 4486 238

Barents Sea:

observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 4999 3243 26 6 0 0 0 0
OW 0 348 134 91 0 0 0 0
VODI 0 34 41 410 41 0 0 0
ODI 0 3 5 92 281 8 0 0
CDI 0 3 3 38 124 490 29 0
VCDI 0 0 0 25 82 321 445 0
observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 4999 3202 24 9 0 0 0 0
OW 0 255 77 51 1 0 0 0
VODI 0 109 70 230 16 0 0 0
ODI 0 37 14 215 132 2 0 0
CDI 0 27 20 95 302 436 9 0
VCDI 0 1 4 62 77 381 465 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 4842 3162 54 60 0 0 0 0
OW 0 110 73 156 22 0 0 0
VODI 0 1 8 163 139 0 0 0
ODI 0 0 0 21 119 25 0 0
CDI 0 0 0 17 90 243 0 0
VCDI 0 0 0 6 56 875 1454 0
observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 4842 3106 46 40 0 0 0 0
OW 0 116 37 98 8 0 0 0
VODI 0 44 33 127 56 0 0 0
ODI 0 6 9 93 98 2 0 0
CDI 0 1 10 37 190 169 0 0
VCDI 0 0 0 28 74 972 1454 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 8036 3117 90 114 24 0 0 0
OW 0 92 64 162 52 17 0 0
VODI 0 1 3 164 76 20 0 0
ODI 0 0 0 26 127 10 1 0
CDI 0 0 0 5 144 121 19 0
VCDI 0 0 0 0 10 225 267 0
observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 8036 3093 69 72 4 0 0 0
OW 0 94 63 123 46 5 0 0
VODI 0 23 21 166 92 32 2 0
ODI 0 0 4 80 93 35 8 0
CDI 0 0 0 30 163 107 116 0
VCDI 0 0 0 0 35 214 161 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 3 3 2 0 0
VODI 0 0 0 8 10 21 0 0
ODI 0 0 0 12 21 29 0 0
CDI 0 0 0 12 35 113 90 0
VCDI 0 0 0 1 15 176 2615 2637
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 10 5 0 0
VODI 0 0 0 2 2 14 0 0
ODI 0 0 0 3 0 23 0 0
CDI 0 0 0 9 0 62 73 3
VCDI 0 0 0 22 72 237 2632 2634

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 4 0 0
CDI 0 0 0 0 4 64 8 58
VCDI 0 0 0 0 0 441 3049 4910
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 6 0 0
CDI 0 0 0 0 4 57 14 33
VCDI 0 0 0 0 0 446 3043 4935

Labrador Sea:

observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 7810 3117 48 20 0 0 0 0
OW 6 352 70 152 28 0 0 0
VODI 0 112 44 265 120 2 0 0
ODI 0 11 7 147 276 121 0 0
CDI 0 0 0 59 343 574 56 0
VCDI 0 0 0 4 68 904 1030 0
observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 7689 3154 53 25 0 0 0 0
OW 127 337 57 153 72 0 0 0
VODI 0 73 32 161 114 15 0 0
ODI 0 21 15 150 137 109 0 0
CDI 0 7 11 132 341 568 42 0
VCDI 0 0 1 26 171 909 1044 0


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