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: 2025-02-27

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: 2025-03-03

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 0 353 26 55 1 0 0 0
OW 0 91 20 34 14 0 0 0
VODI 0 37 17 63 54 1 0 0
ODI 0 16 5 43 99 15 0 0
CDI 0 14 2 24 219 226 71 0
VCDI 0 18 25 91 193 1557 3870 29648
observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 0 324 21 41 0 0 0 0
OW 0 103 21 34 4 0 0 0
VODI 0 39 18 62 51 1 0 0
ODI 0 22 4 58 98 18 0 0
CDI 0 18 4 24 218 254 50 0
VCDI 0 23 27 91 209 1526 3891 29648

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 1 128 2990
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 1 128 2990

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 0
VCDI 0 0 0 0 0 0 228 9750
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 0 228 9750

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 3 0 0
VCDI 0 0 0 0 0 106 1615 3929
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 0 109 1615 3929

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 0
VCDI 0 0 0 0 0 27 805 4467
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 27 805 4467

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 68 0 0 0 0 0 0
OW 0 76 3 0 0 0 0 0
VODI 0 59 16 17 0 0 0 0
ODI 0 34 5 12 0 0 0 0
CDI 0 19 3 12 1 2 1 1
VCDI 0 25 18 52 91 306 3100 2396
observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 0 53 0 0 0 0 0 0
OW 0 83 2 0 0 0 0 0
VODI 0 73 17 21 0 0 0 0
ODI 0 34 5 11 0 0 0 0
CDI 0 19 5 10 7 0 15 1
VCDI 0 19 16 51 85 308 3086 2396

Barents Sea:

observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 4301 4026 148 68 0 0 0 0
OW 0 292 65 218 4 0 0 0
VODI 0 139 45 202 106 0 0 0
ODI 0 37 34 173 111 1 0 0
CDI 0 22 2 122 136 30 0 0
VCDI 0 12 6 53 272 378 319 0
observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 4301 3944 119 41 0 0 0 0
OW 0 344 77 169 13 0 0 0
VODI 0 158 47 236 110 0 0 0
ODI 0 45 37 168 77 12 0 0
CDI 0 26 12 146 133 45 0 0
VCDI 0 11 8 76 296 352 319 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 5667 2697 71 91 26 0 0 0
OW 0 126 25 79 41 0 0 0
VODI 0 51 15 51 40 2 0 0
ODI 0 24 18 40 45 5 0 0
CDI 0 9 34 64 135 113 0 0
VCDI 0 0 0 62 147 1448 570 0
observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 5667 2636 72 90 23 0 0 0
OW 0 141 19 80 40 0 0 0
VODI 0 70 20 51 59 2 0 0
ODI 0 43 19 50 56 7 0 0
CDI 0 17 33 75 134 91 0 0
VCDI 0 0 0 41 122 1468 570 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 8045 3055 65 116 0 0 0 0
OW 0 246 28 98 39 0 0 0
VODI 0 64 16 108 103 2 0 0
ODI 0 15 12 51 75 28 0 0
CDI 0 0 3 70 134 86 14 0
VCDI 0 0 0 6 35 148 325 0
observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 8045 3049 74 129 10 0 0 0
OW 0 265 20 104 46 0 0 0
VODI 0 54 16 105 98 7 0 0
ODI 0 12 13 42 67 23 0 0
CDI 0 0 1 64 122 63 19 0
VCDI 0 0 0 5 43 171 320 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 0 1 0 0
VODI 0 0 0 0 0 3 0 0
ODI 0 0 0 0 0 4 0 0
CDI 0 0 0 0 0 21 1 4
VCDI 0 0 0 0 46 390 2763 2570
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 1 0 0
VODI 0 0 0 0 0 5 0 0
ODI 0 0 0 0 0 4 0 0
CDI 0 0 0 0 0 22 0 1
VCDI 0 0 0 0 46 387 2764 2573

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 2 0 0
CDI 0 0 0 0 0 76 1 0
VCDI 0 0 0 0 0 833 3317 4309
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 67 1 0
VCDI 0 0 0 0 0 844 3317 4309

Labrador Sea:

observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 6446 3328 105 288 49 0 0 0
OW 12 135 83 210 103 0 0 0
VODI 0 43 34 223 208 0 0 0
ODI 0 6 1 147 239 17 0 0
CDI 0 0 0 42 362 352 132 0
VCDI 0 0 0 0 153 1896 1132 0
observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 6452 3298 101 289 16 0 0 0
OW 6 169 81 196 102 0 0 0
VODI 0 43 39 224 239 0 0 0
ODI 0 2 2 159 248 14 0 0
CDI 0 0 0 42 378 301 101 0
VCDI 0 0 0 0 131 1950 1163 0


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