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: 2025-04-17

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: 2025-04-21

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 0 0 0 0 0 0 0
OW 0 0 0 2 0 0 0 0
VODI 0 0 0 6 4 6 0 0
ODI 0 0 0 0 9 9 3 0
CDI 0 0 0 0 18 107 125 5
VCDI 0 0 0 0 0 212 4685 31711
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 4 0 0 0 0
ODI 0 0 0 4 7 5 0 0
CDI 0 0 0 0 24 105 223 8
VCDI 0 0 0 0 0 224 4590 31708

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 17 6 0
VCDI 0 0 0 0 38 214 1076 1768
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 2 2 0
VCDI 0 0 0 0 38 229 1080 1768

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 1 0 0 0
ODI 0 0 0 0 6 1 0 0
CDI 0 0 0 0 8 18 13 1
VCDI 0 0 0 0 42 420 3033 6435
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 5 2 0 0
ODI 0 0 0 0 8 0 0 0
CDI 0 0 0 0 15 21 1 0
VCDI 0 0 0 0 29 416 3045 6436

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 6 108 12 0
VCDI 0 0 0 0 81 148 1957 3341
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 3 9 0 0
CDI 0 0 0 0 14 92 12 3
VCDI 0 0 0 0 70 155 1957 3338

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 3
VCDI 0 0 0 0 0 14 1420 5787
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 1
CDI 0 0 0 0 0 0 8 82
VCDI 0 0 0 0 0 14 1412 5707

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 3
ODI 0 0 0 0 0 5 0 5
CDI 0 0 0 0 0 79 31 35
VCDI 0 0 0 0 0 247 2197 2697
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 2
ODI 0 0 0 0 0 31 0 6
CDI 0 0 0 0 0 53 65 33
VCDI 0 0 0 0 0 247 2163 2699

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 38 5 6 0 0 0 0
OW 0 3 12 35 1 0 0 0
VODI 0 0 0 37 29 32 0 1
ODI 0 0 0 3 51 54 4 11
CDI 0 0 0 0 79 396 141 27
VCDI 0 0 0 0 0 313 3305 1734
observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 0 25 4 10 0 0 0 0
OW 0 16 7 23 1 0 0 0
VODI 0 0 6 33 2 0 0 0
ODI 0 0 0 15 24 1 0 0
CDI 0 0 0 0 78 162 71 24
VCDI 0 0 0 0 55 632 3379 1749

Barents Sea:

observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 3438 3501 128 177 4 0 0 0
OW 0 114 61 210 95 0 0 0
VODI 0 23 6 183 277 53 0 0
ODI 0 0 0 42 222 219 0 0
CDI 0 0 0 0 62 796 214 0
VCDI 0 0 0 0 1 173 1323 0
observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 3438 3465 120 235 30 0 0 0
OW 0 126 58 209 209 16 0 0
VODI 0 33 17 105 137 171 1 0
ODI 0 10 0 60 184 275 22 0
CDI 0 4 0 3 98 686 744 0
VCDI 0 0 0 0 3 93 770 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 3914 3431 129 195 39 0 0 0
OW 0 15 48 162 81 16 0 0
VODI 0 0 0 94 144 53 0 0
ODI 0 0 0 7 126 84 0 0
CDI 0 0 0 0 46 328 55 5
VCDI 0 0 0 0 2 229 2151 342
observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 3914 3388 109 137 13 0 0 0
OW 0 51 53 169 70 12 0 0
VODI 0 7 15 112 125 58 0 0
ODI 0 0 0 40 111 102 10 0
CDI 0 0 0 0 119 260 401 6
VCDI 0 0 0 0 0 278 1795 341

Southeast Greenland:

observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 7965 3106 113 155 3 0 0 0
OW 0 72 71 148 85 0 0 0
VODI 0 1 2 133 117 12 0 0
ODI 0 0 0 25 153 58 0 0
CDI 0 0 0 2 100 410 22 0
VCDI 0 0 0 0 0 174 60 0
observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 7965 3056 109 133 8 0 0 0
OW 0 107 38 144 66 2 0 0
VODI 0 16 38 84 123 24 0 0
ODI 0 0 1 83 102 86 0 0
CDI 0 0 0 19 159 401 49 0
VCDI 0 0 0 0 0 141 33 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 5 6 1 4 0 0 0
VODI 0 0 5 68 66 0 0 0
ODI 0 0 0 14 183 35 0 0
CDI 0 0 0 6 164 347 127 7
VCDI 0 0 0 0 4 420 2871 1470
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 5 11 9 12 0 0 0
ODI 0 0 0 60 97 0 0 0
CDI 0 0 0 20 239 258 173 25
VCDI 0 0 0 0 73 544 2825 1452

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 1 2 7 2 0 0 0
VODI 0 1 1 69 26 4 0 0
ODI 0 0 0 16 36 83 14 5
CDI 0 0 0 3 103 455 312 57
VCDI 0 0 0 0 5 624 5015 1697
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 10 6 0 0 0
VODI 0 2 3 31 13 21 0 0
ODI 0 0 0 26 27 112 40 3
CDI 0 0 0 28 71 327 357 78
VCDI 0 0 0 0 55 706 4944 1678

Labrador Sea:

observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 6941 4438 49 101 39 0 0 0
OW 0 474 172 178 23 0 0 0
VODI 0 4 17 439 382 4 0 0
ODI 0 0 0 46 478 100 0 0
CDI 0 0 0 0 175 298 8 0
VCDI 0 0 0 0 15 222 1097 46
observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 6941 4315 38 85 38 0 0 0
OW 0 424 113 112 46 0 0 0
VODI 0 174 87 468 382 84 0 0
ODI 0 3 0 91 416 159 26 0
CDI 0 0 0 8 187 131 87 0
VCDI 0 0 0 0 43 250 992 46


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