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: 2025-04-03

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: 2025-04-07

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 1 1 12 2 0 0 0
OW 0 6 1 6 16 0 0 0
VODI 0 0 0 12 28 0 0 0
ODI 0 0 0 0 22 5 0 0
CDI 0 0 0 0 28 53 0 0
VCDI 0 0 0 0 0 96 4065 32548
observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 0 0 1 4 0 0 0 0
OW 0 6 0 12 15 0 0 0
VODI 0 1 1 10 18 0 0 0
ODI 0 0 0 4 24 7 0 0
CDI 0 0 0 0 34 47 36 7
VCDI 0 0 0 0 5 100 4029 32541

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 4 15 0
VCDI 0 0 0 0 0 161 1270 1669
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 16 0
VCDI 0 0 0 0 0 165 1269 1669

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 3 1 0
ODI 0 0 0 0 0 15 7 0
CDI 0 0 0 0 4 35 39 0
VCDI 0 0 0 0 32 252 2209 7381
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 6 10 0
CDI 0 0 0 0 3 43 41 0
VCDI 0 0 0 0 33 254 2205 7381

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 0 1 5
VCDI 0 0 0 0 0 0 153 5494
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 0 154 5499

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 12
VCDI 0 0 0 0 0 0 0 7212
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 8
VCDI 0 0 0 0 0 0 0 7216

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 1 4 2
CDI 0 0 0 0 0 2 39 4
VCDI 0 0 0 0 0 1 772 4474
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 5
CDI 0 0 0 0 0 0 0 11
VCDI 0 0 0 0 0 4 815 4464

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 83 0 0 0 0 0 0
OW 0 81 13 2 0 0 0 0
VODI 0 8 12 62 3 0 0 0
ODI 0 0 1 42 15 0 1 0
CDI 0 0 0 18 138 296 36 0
VCDI 0 0 0 0 30 308 4118 1050
observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 0 58 0 0 0 0 0 0
OW 0 70 0 0 0 0 0 0
VODI 0 40 12 3 0 5 0 0
ODI 0 4 14 45 0 44 2 0
CDI 0 0 0 71 74 274 95 0
VCDI 0 0 0 5 112 281 4058 1050

Barents Sea:

observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 3937 3419 99 57 0 0 0 0
OW 2 250 89 268 30 0 0 0
VODI 0 17 9 184 256 10 0 0
ODI 0 0 1 51 282 124 0 0
CDI 0 0 0 1 150 1120 98 0
VCDI 0 0 0 0 0 271 597 0
observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 3925 3359 93 103 3 0 0 0
OW 14 214 88 227 39 0 0 0
VODI 0 95 10 162 247 13 0 0
ODI 0 16 3 49 210 149 0 0
CDI 0 2 4 20 207 1107 146 0
VCDI 0 0 0 0 12 256 549 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 4234 3314 97 123 16 0 0 0
OW 0 45 71 167 74 1 0 0
VODI 0 0 4 155 145 16 0 0
ODI 0 0 0 6 149 54 0 0
CDI 0 0 0 0 64 500 67 0
VCDI 0 0 0 0 1 376 1917 100
observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 4234 3251 85 86 18 0 0 0
OW 0 86 63 161 48 0 0 0
VODI 0 22 18 137 89 14 0 0
ODI 0 0 6 54 150 70 0 0
CDI 0 0 0 13 144 571 132 0
VCDI 0 0 0 0 0 292 1852 100

Southeast Greenland:

observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 7752 3165 109 258 51 0 0 0
OW 0 112 35 98 130 5 0 0
VODI 0 1 10 79 132 26 0 0
ODI 0 0 0 51 136 65 0 0
CDI 0 0 0 6 225 306 43 0
VCDI 0 0 0 0 0 21 171 0
observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 7752 3115 102 249 70 0 0 0
OW 0 97 22 77 137 7 0 0
VODI 0 55 13 53 110 50 0 0
ODI 0 11 17 46 56 104 13 0
CDI 0 0 0 67 301 258 192 0
VCDI 0 0 0 0 0 4 9 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 0 2 0 0
ODI 0 0 0 0 3 21 0 0
CDI 0 0 0 0 46 242 49 0
VCDI 0 0 0 0 70 537 3225 1608
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 3 0 0
CDI 0 0 0 0 14 105 37 1
VCDI 0 0 0 0 105 694 3237 1607

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 3 18 0 0
ODI 0 0 0 0 9 39 1 2
CDI 0 0 0 0 13 148 39 22
VCDI 0 0 0 0 18 401 3694 4131
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 4 0 0
VODI 0 0 0 0 1 15 0 0
ODI 0 0 0 0 7 36 8 1
CDI 0 0 0 0 9 123 74 14
VCDI 0 0 0 0 26 428 3652 4140

Labrador Sea:

observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 6491 3952 56 86 2 0 0 0
OW 11 206 119 202 3 0 0 0
VODI 0 22 21 314 206 22 0 0
ODI 0 8 8 90 333 95 4 0
CDI 0 0 0 18 404 979 95 0
VCDI 0 0 0 0 42 781 1124 52
observations
Ice free Ice free
near MIZ		 OW VODI ODI CDI VCDI
near MIZ		 VCDI
m
o
d
e
l		 Ice free 6502 3857 46 82 2 0 0 0
OW 0 202 73 151 12 0 0 0
VODI 0 79 54 214 132 13 0 0
ODI 0 27 16 147 218 70 4 0
CDI 0 23 11 95 463 850 82 0
VCDI 0 0 4 21 163 944 1137 52


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