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: 2025-04-24

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: 2025-04-28

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 3 0 0 0 0
VODI 0 0 0 18 4 0 0 0
ODI 0 0 0 0 13 3 0 0
CDI 0 0 0 0 8 90 6 0
VCDI 0 0 0 0 0 400 7112 29245
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 0 0 0 0
VODI 0 0 0 15 0 0 0 0
ODI 0 0 0 3 10 2 0 0
CDI 0 0 0 0 15 135 140 0
VCDI 0 0 0 0 0 356 6978 29245

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 3 0
VCDI 0 0 0 0 10 48 992 2066
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 2 0
VCDI 0 0 0 0 10 48 993 2066

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 4 0 0
CDI 0 0 0 0 1 59 19 1
VCDI 0 0 0 0 3 68 1881 7942
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 1 5
CDI 0 0 0 0 0 45 88 27
VCDI 0 0 0 0 4 76 1811 7911

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 1 35 1 0 0
ODI 0 0 0 12 27 2 0 0
CDI 0 0 0 4 41 40 2 0
VCDI 0 0 0 3 116 171 2415 2783
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 1 23 3 0 0
ODI 0 0 0 3 34 7 0 0
CDI 0 0 0 9 29 27 4 0
VCDI 0 0 0 7 133 177 2413 2783

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 3 0 0
ODI 0 0 0 0 0 7 2 0
CDI 0 0 0 0 6 63 13 2
VCDI 0 0 0 0 1 203 2616 4308
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 2 0 0
ODI 0 0 0 0 0 7 2 0
CDI 0 0 0 0 4 45 24 3
VCDI 0 0 0 0 3 222 2605 4307

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 4 0 0 0
VODI 0 0 0 1 61 4 1 0
ODI 0 0 0 0 70 6 33 0
CDI 0 0 0 0 147 73 79 0
VCDI 0 0 0 0 280 437 3262 841
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 4 0 1 0
VODI 0 0 0 0 40 3 60 0
ODI 0 0 0 0 59 9 38 0
CDI 0 0 0 1 130 33 72 7
VCDI 0 0 0 0 329 475 3204 834

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 24 0 0 0 0 0 0
OW 0 79 19 15 0 0 0 0
VODI 0 6 1 46 11 0 0 0
ODI 0 0 0 5 96 13 3 0
CDI 0 0 0 0 101 461 56 5
VCDI 0 0 0 0 0 176 5033 167
observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 0 20 1 0 0 0 0 0
OW 0 57 8 2 0 0 0 0
VODI 0 32 11 48 3 7 0 0
ODI 0 0 0 16 95 70 17 0
CDI 0 0 0 0 85 366 252 7
VCDI 0 0 0 0 25 207 4823 165

Barents Sea:

observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 3949 2919 103 74 0 0 0 0
OW 31 187 107 207 29 0 0 0
VODI 1 6 9 286 177 1 0 0
ODI 0 0 0 26 461 51 0 0
CDI 0 0 0 0 113 1112 141 0
VCDI 0 0 0 0 1 143 1188 0
observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 3950 2827 92 121 0 0 0 0
OW 25 234 93 254 99 0 0 0
VODI 6 51 30 140 289 13 0 0
ODI 0 0 4 70 261 376 0 0
CDI 0 0 0 8 132 803 799 0
VCDI 0 0 0 0 0 115 530 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 4123 3274 104 51 0 0 0 0
OW 0 51 66 161 7 0 0 0
VODI 0 0 3 215 100 0 0 0
ODI 0 0 0 10 283 32 0 0
CDI 0 0 0 0 61 1037 77 0
VCDI 0 0 0 0 0 421 1595 25
observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 4123 3216 101 126 11 0 0 0
OW 0 100 39 128 51 4 0 0
VODI 0 9 32 123 116 45 0 0
ODI 0 0 1 58 149 77 0 0
CDI 0 0 0 2 124 736 212 0
VCDI 0 0 0 0 0 628 1460 25

Southeast Greenland:

observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 8118 3176 96 125 22 0 0 0
OW 0 35 81 110 38 5 0 0
VODI 0 0 3 170 117 12 0 0
ODI 0 0 0 13 161 24 4 0
CDI 0 0 0 0 94 216 15 0
VCDI 0 0 0 0 0 140 212 0
observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 8118 3144 97 111 38 7 0 0
OW 0 65 67 142 47 16 4 0
VODI 0 2 16 149 114 23 15 0
ODI 0 0 0 16 123 65 18 0
CDI 0 0 0 0 110 129 79 0
VCDI 0 0 0 0 0 157 115 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 10 0 0 0 0 0 0
OW 0 38 27 21 3 0 0 0
VODI 0 6 0 302 59 0 0 0
ODI 0 0 0 58 214 7 0 0
CDI 0 0 0 25 143 412 26 0
VCDI 0 0 0 0 40 532 3284 596
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 20 0 12 2 0 0 0
VODI 0 34 22 135 55 0 0 0
ODI 0 0 5 136 103 9 2 0
CDI 0 0 0 118 178 441 670 0
VCDI 0 0 0 5 121 501 2638 596

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 17 0 0 0 0
VODI 0 0 0 86 31 2 0 0
ODI 0 0 0 8 65 30 13 0
CDI 0 0 0 7 70 392 153 7
VCDI 0 0 0 0 14 748 4725 2170
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 37 8 1 0 0
VODI 0 0 0 54 24 22 9 0
ODI 0 0 0 22 33 126 78 12
CDI 0 0 0 5 76 347 629 72
VCDI 0 0 0 0 39 676 4175 2093

Labrador Sea:

observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 7904 3808 24 26 0 0 0 0
OW 0 363 193 217 28 1 0 0
VODI 0 15 7 491 105 20 0 0
ODI 0 0 0 53 589 73 3 0
CDI 0 0 0 0 192 468 32 0
VCDI 0 0 0 0 15 347 772 0
observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 7904 3614 28 14 3 0 0 0
OW 0 505 111 307 48 6 0 0
VODI 0 67 81 347 312 100 3 0
ODI 0 0 4 98 363 178 59 0
CDI 0 0 0 21 164 336 260 0
VCDI 0 0 0 0 39 289 485 0


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