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: 2025-05-08

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

Model vs. observations, sea ice class contingency tables

Date: 2025-05-02:

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 59235 13281 159 104 8 0 0 0
OW 690 1246 344 500 168 8 1 0
VODI 1859 241 192 784 540 189 41 0
ODI 1823 24 42 309 885 634 181 0
CDI 0 2 3 49 641 3605 2332 0
VCDI 0 0 0 5 43 1369 7422 3903
...date precedes bulletin

Date: 2025-05-04:

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 59747 12735 98 41 10 0 0 0
OW 708 1206 388 552 164 23 1 0
VODI 1882 280 187 779 583 188 54 0
ODI 1790 54 58 365 1078 765 169 0
CDI 0 3 7 65 838 4345 1933 0
VCDI 0 0 0 1 50 843 9231 1641
...date precedes bulletin

Date: 2025-05-06:

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 59706 13034 71 59 5 0 0 0
OW 803 1089 324 391 121 13 0 0
VODI 1897 294 306 999 575 117 19 0
ODI 1771 4 23 383 1500 607 39 0
CDI 0 0 0 62 940 4591 1011 0
VCDI 0 0 0 13 67 1376 8550 2102
...date precedes bulletin

Date: 2025-05-08:

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 59314 13120 87 99 20 1 0 0
OW 777 1381 331 441 96 22 0 0
VODI 1928 325 282 1018 651 171 38 0
ODI 1734 11 29 441 1465 794 110 0
CDI 0 6 5 77 1201 3893 1690 1
VCDI 0 0 9 39 146 2108 7477 1524
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 59297 13071 95 106 20 2 0 0
OW 794 1432 327 436 103 24 0 0
VODI 1928 322 276 1006 662 195 46 0
ODI 1734 14 32 450 1469 806 109 0
CDI 0 4 7 77 1193 3888 1764 1
VCDI 0 0 6 40 132 2074 7396 1524

Date: 2025-05-10:

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 59662 12693 67 79 23 0 0 0
OW 820 1653 307 384 140 32 5 0
VODI 1966 508 337 984 685 199 67 0
ODI 1688 84 74 567 1499 711 151 0
CDI 0 26 25 169 1544 3859 1695 1
VCDI 0 17 11 39 92 1470 7900 629
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 59648 12724 72 84 28 1 0 0
OW 835 1633 301 400 147 45 10 0
VODI 1966 509 342 949 670 218 70 0
ODI 1687 74 71 583 1514 700 149 0
CDI 0 25 24 169 1523 3823 1700 1
VCDI 0 16 11 37 101 1484 7889 629

Date: 2025-05-12:

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 60214 12641 93 79 3 0 0 0
OW 808 1612 321 352 43 6 0 0
VODI 2015 357 402 1525 668 73 10 0
ODI 1626 24 38 523 2579 924 33 0
CDI 0 19 14 157 1241 3557 1004 0
VCDI 0 0 0 8 24 1263 8591 15
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 60167 12120 75 88 7 0 0 0
OW 852 1744 316 423 115 31 9 0
VODI 1999 593 289 1086 770 291 42 0
ODI 1645 147 149 736 1589 937 86 0
CDI 0 42 31 284 1991 3080 1905 0
VCDI 0 7 8 27 86 1484 7596 15

Date: 2025-05-14:

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 61763 11311 27 8 0 0 0 0
OW 813 1892 326 238 26 6 0 0
VODI 2058 465 471 1614 814 85 10 0
ODI 1574 33 55 580 2243 816 22 0
CDI 0 22 16 147 1381 3474 1174 0
VCDI 0 0 0 2 18 1673 7653 52
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 61727 10839 66 28 5 4 0 0
OW 845 1922 260 321 100 15 1 0
VODI 2040 712 363 1208 883 210 24 0
ODI 1596 198 174 779 1645 983 64 0
CDI 0 50 30 236 1793 3241 1948 0
VCDI 0 2 2 17 56 1601 6822 52

Date: 2025-05-16:

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 61859 11143 43 34 8 2 0 0
OW 895 2027 312 247 79 8 9 0
VODI 2218 581 486 1813 814 63 22 0
ODI 1269 46 55 799 1939 742 57 0
CDI 0 17 22 169 1382 3811 1565 0
VCDI 0 0 1 8 47 1558 6666 46
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 61788 10844 102 103 45 6 0 0
OW 825 1790 259 384 150 34 10 0
VODI 2087 887 359 1404 829 178 26 0
ODI 1541 251 156 856 1369 874 92 0
CDI 0 42 43 321 1821 3512 2138 0
VCDI 0 0 0 2 55 1580 6053 46


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