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 0 375 23 31 1 0 0 0
OW 0 105 33 42 7 0 0 0
VODI 0 37 16 107 76 0 0 0
ODI 0 9 5 40 159 11 0 0
CDI 0 3 18 42 190 407 59 0
VCDI 0 0 0 48 147 1381 3882 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 4 0 0
VCDI 0 0 0 0 0 105 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 0 106 0 0 0 0 0 0
OW 0 104 14 0 0 0 0 0
VODI 0 63 16 43 1 0 0 0
ODI 0 4 3 8 11 0 0 0
CDI 0 4 6 7 25 4 0 0
VCDI 0 0 6 35 55 304 3101 2397
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 4088 113 26 0 0 0 0
OW 0 346 109 170 0 0 0 0
VODI 0 75 67 448 39 0 0 0
ODI 0 15 8 137 219 1 0 0
CDI 0 4 2 27 196 49 0 0
VCDI 0 0 1 28 175 359 319 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 2733 54 60 15 0 0 0
OW 0 165 75 111 31 0 0 0
VODI 0 9 24 115 90 0 0 0
ODI 0 0 9 48 71 8 0 0
CDI 0 0 1 53 134 227 2 0
VCDI 0 0 0 0 93 1333 568 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 3118 57 90 1 0 0 0
OW 0 261 57 142 31 0 0 0
VODI 0 1 10 155 113 0 0 0
ODI 0 0 0 48 95 23 0 0
CDI 0 0 0 14 135 116 9 0
VCDI 0 0 0 0 11 125 330 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 8 0 0
CDI 0 0 0 0 8 43 1 3
VCDI 0 0 0 0 38 364 2763 2571
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 5 0 0
CDI 0 0 0 0 0 76 2 0
VCDI 0 0 0 0 0 830 3316 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 6458 3347 118 238 22 0 0 0
OW 0 135 87 277 68 0 0 0
VODI 0 27 17 334 236 0 0 0
ODI 0 3 1 58 431 57 0 0
CDI 0 0 0 3 321 790 83 0
VCDI 0 0 0 0 36 1418 1181 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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