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: 2025-09-25

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

Model vs. observations, sea ice class contingency tables

Date: 2025-09-19:

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 87574 3437 87 53 0 0 0 0
OW 2299 191 81 109 69 9 0 0
VODI 1517 4 36 163 215 58 0 0
ODI 0 0 0 11 241 116 0 0
CDI 0 0 0 1 90 1053 416 0
VCDI 0 0 0 0 1 1937 2734 360
...date precedes bulletin

Date: 2025-09-21:

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 87974 2894 104 61 7 0 0 0
OW 2252 229 82 84 66 12 0 0
VODI 1569 9 42 202 172 70 0 0
ODI 0 0 0 8 252 99 4 0
CDI 0 0 0 8 112 712 221 0
VCDI 0 0 0 0 2 685 4194 736
...date precedes bulletin

Date: 2025-09-23:

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 88231 2896 42 15 0 0 0 0
OW 2175 250 111 89 13 0 0 0
VODI 1668 2 12 203 146 16 0 0
ODI 0 0 0 33 205 82 0 0
CDI 0 0 0 0 202 450 41 0
VCDI 0 0 0 0 19 651 4086 1224
...date precedes bulletin

Date: 2025-09-25:

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 88164 2904 18 16 0 0 0 0
OW 2056 250 93 101 29 0 0 0
VODI 1853 21 45 150 141 10 0 0
ODI 0 2 6 62 181 100 0 0
CDI 0 0 0 3 208 511 88 0
VCDI 0 0 0 0 24 1083 4397 346
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 88164 2876 16 17 1 0 0 0
OW 2057 274 91 88 26 0 0 0
VODI 1852 25 49 158 147 10 0 0
ODI 0 2 6 63 178 98 0 0
CDI 0 0 0 6 215 571 147 0
VCDI 0 0 0 0 16 1025 4338 346

Date: 2025-09-27:

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 88222 2809 21 19 0 0 0 0
OW 2069 311 77 85 38 0 0 0
VODI 1794 52 61 150 107 26 0 0
ODI 0 4 18 80 151 96 1 0
CDI 0 0 0 19 269 582 23 0
VCDI 0 0 0 0 24 1256 4339 159
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 88222 2782 23 15 1 0 0 0
OW 2076 339 74 87 34 0 0 0
VODI 1787 51 64 154 111 18 0 0
ODI 0 4 16 74 143 97 1 0
CDI 0 0 0 23 287 643 61 0
VCDI 0 0 0 0 13 1202 4301 159

Date: 2025-09-29:

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 87994 2832 28 26 0 0 0 0
OW 2010 266 86 129 53 0 0 0
VODI 1863 27 40 176 129 26 9 0
ODI 0 10 6 54 155 92 24 0
CDI 0 0 0 6 170 724 124 0
VCDI 0 0 0 0 7 901 4583 312
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 87994 2751 26 11 0 0 0 0
OW 2014 335 85 116 34 0 0 0
VODI 1859 44 43 199 135 18 7 0
ODI 0 5 6 55 163 85 21 0
CDI 0 0 0 10 172 689 116 0
VCDI 0 0 0 0 10 951 4596 312

Date: 2025-10-01:

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 87746 2956 60 29 1 0 0 0
OW 1948 129 88 134 42 1 0 0
VODI 1943 12 25 96 200 26 0 0
ODI 0 2 6 24 92 124 1 0
CDI 0 0 1 14 76 440 102 0
VCDI 0 0 0 0 2 800 5370 372
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 87761 2799 35 10 0 0 0 0
OW 1973 256 97 149 78 4 0 0
VODI 1903 37 32 103 206 51 3 0
ODI 0 6 10 20 78 159 9 0
CDI 0 1 6 15 43 423 170 0
VCDI 0 0 0 0 8 754 5291 372

Date: 2025-10-03:

Best estimate Forecast
...observations not yet available ...observations not yet available


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