Description of algorithm
Full domain
American sector
European sector
  Ice concntr, edge pos
  Contingency tables
Asian sector

Validation of sea ice concentration - European sector

Bulletin date: 2025-07-31

Data source: OSI SAF N.H. AMSR sea ice concentration

Model vs. observations, sea ice class contingency tables

Date: 2025-07-25:

Best estimate Forecast
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 81337 5416 39 8 5 0 0 0
OW 1892 1346 366 363 16 0 0 0
VODI 2295 178 254 1052 287 22 0 0
ODI 0 7 18 226 936 326 9 0
CDI 0 0 0 22 982 3925 216 0
VCDI 0 0 0 0 2 1300 17 0
...date precedes bulletin

Date: 2025-07-27:

Best estimate Forecast
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 81041 6037 64 23 2 0 0 0
OW 1819 1123 309 379 34 1 0 0
VODI 2260 168 249 1100 278 33 0 0
ODI 0 18 18 233 1090 457 31 0
CDI 0 1 4 23 1252 3387 132 0
VCDI 0 0 0 0 1 1237 58 0
...date precedes bulletin

Date: 2025-07-29:

Best estimate Forecast
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 82584 5226 105 23 4 0 0 0
OW 1940 1005 410 294 16 0 0 0
VODI 2003 42 158 1073 221 5 0 0
ODI 0 0 3 200 2030 386 7 0
CDI 0 0 1 7 526 3466 108 0
VCDI 0 0 0 0 0 495 524 0
...date precedes bulletin

Date: 2025-07-31:

Best estimate Forecast
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 83046 4896 40 19 4 0 0 0
OW 1966 1119 337 301 10 0 0 0
VODI 1968 123 221 846 260 2 1 0
ODI 0 1 12 159 1984 382 1 0
CDI 0 0 1 13 668 3154 149 0
VCDI 0 0 0 0 0 1090 89 0
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 83045 4890 47 16 3 0 0 0
OW 1965 1088 311 343 16 0 0 0
VODI 1970 161 241 820 255 2 1 0
ODI 0 0 9 144 1884 442 0 0
CDI 0 0 3 15 768 3088 150 0
VCDI 0 0 0 0 0 1096 89 0

Date: 2025-08-02:

Best estimate Forecast
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 81447 6394 64 23 2 0 0 0
OW 1997 1358 318 246 13 0 0 0
VODI 1924 302 317 751 110 2 0 0
ODI 0 9 26 214 1711 371 10 0
CDI 0 1 3 23 1164 2366 557 0
VCDI 0 0 0 0 0 999 140 0
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 81447 6396 72 22 2 0 0 0
OW 1995 1314 335 298 12 0 0 0
VODI 1926 348 292 716 126 3 0 0
ODI 0 5 25 195 1675 461 7 0
CDI 0 1 4 26 1185 2214 549 0
VCDI 0 0 0 0 0 1060 151 0

Date: 2025-08-04:

Best estimate Forecast
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 84099 4217 43 18 2 0 0 0
OW 2002 1800 403 309 13 0 0 0
VODI 1917 11 41 687 200 2 0 0
ODI 0 0 1 63 2550 228 0 0
CDI 0 0 0 1 374 3080 124 0
VCDI 0 0 0 0 0 189 488 0
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 84101 3743 36 15 1 0 0 0
OW 2029 1699 203 199 12 0 0 0
VODI 1888 564 231 577 90 2 0 0
ODI 0 16 12 251 1664 353 1 0
CDI 0 6 6 36 1365 2871 286 0
VCDI 0 0 0 0 7 273 325 0

Date: 2025-08-06:

Best estimate Forecast
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 85256 3288 31 19 1 0 0 0
OW 2168 1765 284 340 21 1 0 0
VODI 1883 169 146 476 123 12 0 0
ODI 0 1 13 119 2274 80 23 0
CDI 0 0 0 4 1303 2560 72 0
VCDI 0 0 0 0 0 337 93 0
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 85180 2863 17 10 1 0 0 0
OW 2279 1632 208 194 15 0 0 0
VODI 1848 676 187 449 77 20 1 0
ODI 0 48 52 257 1498 197 18 0
CDI 0 4 10 48 2126 2540 135 0
VCDI 0 0 0 0 5 233 34 0

Date: 2025-08-08:

Best estimate Forecast
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 85656 3255 44 21 1 0 0 0
OW 2180 1811 235 236 28 2 0 0
VODI 1845 239 71 323 217 28 0 0
ODI 0 13 25 105 1914 147 0 0
CDI 0 0 0 6 1053 2304 864 0
VCDI 0 0 0 0 1 38 200 0
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 85550 2802 41 21 1 0 0 0
OW 2318 1690 154 180 17 0 0 0
VODI 1813 741 132 297 139 11 0 0
ODI 0 83 46 171 1214 227 2 0
CDI 0 2 2 22 1843 2261 973 0
VCDI 0 0 0 0 0 20 89 0


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