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: 2025-04-10

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: 2025-04-14

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 0 3 0 0 0
VODI 0 0 0 0 10 1 0 0
ODI 0 0 0 20 26 5 0 0
CDI 0 0 0 29 55 112 12 0
VCDI 0 0 0 0 22 328 5699 30580
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 3 0 0 0
VODI 0 0 0 0 14 1 0 0
ODI 0 0 0 18 25 8 0 0
CDI 0 0 0 29 50 99 5 0
VCDI 0 0 0 2 24 338 5706 30580

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 6 0
VCDI 0 0 0 0 0 104 1402 1607
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 7 0
VCDI 0 0 0 0 0 104 1401 1607

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 17 2 0
CDI 0 0 0 0 8 71 52 3
VCDI 0 0 0 0 73 405 3087 6260
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 1 0
ODI 0 0 0 0 0 28 2 0
CDI 0 0 0 0 9 97 61 2
VCDI 0 0 0 0 72 368 3077 6261

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 1 0 0
CDI 0 0 0 0 0 13 0 0
VCDI 0 0 0 0 0 100 1642 3897
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 1 0 0
CDI 0 0 0 0 0 11 0 0
VCDI 0 0 0 0 0 102 1642 3897

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 1 1
CDI 0 0 0 0 0 2 18 22
VCDI 0 0 0 0 0 26 1791 5363
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 1 0
CDI 0 0 0 0 0 1 14 9
VCDI 0 0 0 0 0 27 1795 5377

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 15
CDI 0 0 0 0 0 0 0 74
VCDI 0 0 0 0 0 0 0 5210
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 1
ODI 0 0 0 0 0 0 0 16
CDI 0 0 0 0 0 0 0 74
VCDI 0 0 0 0 0 0 0 5208

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 46 0 0 0 0 0 0
OW 0 89 7 0 0 0 0 0
VODI 0 45 10 15 3 0 0 0
ODI 0 40 2 4 25 1 1 0
CDI 0 17 22 36 165 173 48 0
VCDI 0 0 9 67 114 775 4534 69
observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 0 26 0 0 0 0 0 0
OW 0 123 3 1 0 0 0 0
VODI 0 60 14 11 2 1 0 0
ODI 0 22 16 10 30 9 6 0
CDI 0 6 15 35 169 178 133 0
VCDI 0 0 2 65 106 761 4444 69

Barents Sea:

observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 3903 3568 104 132 0 0 0 0
OW 0 147 58 266 54 0 0 0
VODI 0 26 8 93 213 38 0 0
ODI 0 11 2 22 133 304 67 0
CDI 0 1 3 37 217 760 324 0
VCDI 0 0 0 0 36 117 678 0
observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 3901 3546 82 112 0 0 0 0
OW 2 188 80 240 40 0 0 0
VODI 0 14 9 128 236 29 0 0
ODI 0 5 3 36 134 334 21 0
CDI 0 0 1 31 205 743 327 0
VCDI 0 0 0 3 38 113 721 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 4121 3425 112 90 8 0 0 0
OW 0 44 72 212 60 0 0 0
VODI 0 0 6 120 103 4 0 0
ODI 0 0 0 51 98 37 0 0
CDI 0 0 0 3 152 271 66 0
VCDI 0 0 0 0 29 494 1930 188
observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 4121 3395 86 67 1 0 0 0
OW 0 74 96 200 50 0 0 0
VODI 0 0 8 161 108 2 0 0
ODI 0 0 0 47 118 39 0 0
CDI 0 0 0 1 156 296 123 0
VCDI 0 0 0 0 17 469 1873 188

Southeast Greenland:

observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 7945 3140 159 184 50 0 0 0
OW 0 21 50 158 83 5 0 0
VODI 0 0 7 122 63 47 0 0
ODI 0 0 0 65 53 66 1 0
CDI 0 0 0 17 106 124 91 0
VCDI 0 0 0 0 58 274 98 0
observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 7945 3137 153 186 50 0 0 0
OW 0 24 59 170 86 5 0 0
VODI 0 0 4 127 75 52 0 0
ODI 0 0 0 54 48 74 1 0
CDI 0 0 0 9 111 114 77 0
VCDI 0 0 0 0 43 271 112 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 0 0 0
VODI 0 0 0 0 3 0 0 0
ODI 0 0 0 25 13 0 0 0
CDI 0 0 0 58 276 294 170 0
VCDI 0 0 0 110 195 465 2951 1243
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 2 0 0 0
ODI 0 0 0 27 9 0 0 0
CDI 0 0 0 79 272 242 241 0
VCDI 0 0 0 87 204 517 2880 1243

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 13 0 0 0
VODI 0 0 0 0 30 2 0 1
ODI 0 0 0 0 23 15 14 7
CDI 0 0 0 0 61 77 338 59
VCDI 0 0 0 0 26 770 4044 3058
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 7 0 0 0
VODI 0 0 0 0 26 0 0 0
ODI 0 0 0 0 25 12 12 12
CDI 0 0 0 0 63 73 378 79
VCDI 0 0 0 0 32 779 4006 3034

Labrador Sea:

observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 6197 4202 60 84 14 0 0 0
OW 0 248 59 185 118 3 0 0
VODI 0 69 23 280 188 29 0 0
ODI 0 10 19 178 526 175 6 0
CDI 0 1 2 68 493 918 316 5
VCDI 0 0 0 8 122 485 651 4
observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 6197 4213 55 73 10 0 0 0
OW 0 232 58 191 110 0 0 0
VODI 0 69 36 296 204 19 1 0
ODI 0 14 11 176 578 184 8 3
CDI 0 2 3 55 413 886 345 5
VCDI 0 0 0 12 146 521 619 1


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