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

Validation of sea ice concentration - European sector

Bulletin date: 2025-05-22

Data source: OSI SAF N.H. multi-product sea ice concentration

Model vs. observations, sea ice class contingency tables

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 63086 11406 74 85 8 0 0 0
OW 29 1754 381 477 94 2 0 0
VODI 0 240 336 2631 612 25 0 0
ODI 0 16 14 871 2456 347 4 0
CDI 0 3 2 91 1793 3800 1323 42
VCDI 0 0 0 3 25 1275 6519 592
...date precedes bulletin

Date: 2025-05-18:

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 63180 11232 94 106 6 0 0 0
OW 32 1877 293 670 49 0 0 0
VODI 0 427 405 2589 565 18 0 0
ODI 0 32 21 719 2508 303 11 0
CDI 0 3 7 122 2204 3196 909 256
VCDI 0 0 0 0 36 1091 5665 1790
...date precedes bulletin

Date: 2025-05-20:

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 63276 12060 112 155 1 0 0 0
OW 0 1449 609 907 79 0 0 0
VODI 0 57 88 2753 755 3 0 0
ODI 0 1 2 203 3194 389 8 0
CDI 0 0 0 12 1048 3824 710 0
VCDI 0 0 0 0 18 980 5200 2523
...date precedes bulletin

Date: 2025-05-22:

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 63303 11988 94 209 6 0 0 0
OW 1 1528 577 1163 52 0 0 0
VODI 0 72 103 2551 696 18 0 0
ODI 0 1 0 247 3131 309 2 0
CDI 0 0 0 50 1427 4083 684 0
VCDI 0 0 0 6 5 960 5355 1795
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 63302 11981 94 226 5 0 0 0
OW 2 1537 565 1065 49 0 0 0
VODI 0 70 115 2642 770 20 0 0
ODI 0 1 0 242 3106 328 3 0
CDI 0 0 0 46 1384 4037 647 0
VCDI 0 0 0 5 3 985 5391 1795

Date: 2025-05-24:

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 64306 11144 78 56 1 0 0 0
OW 2 2024 599 1012 45 1 0 0
VODI 0 121 231 2192 778 16 0 0
ODI 0 0 4 378 2915 280 9 0
CDI 0 0 0 61 1697 3520 547 2
VCDI 0 0 0 15 55 1228 3222 3877
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 64304 11107 87 65 1 0 0 0
OW 4 2060 594 980 40 0 0 0
VODI 0 122 229 2243 847 15 0 0
ODI 0 0 2 350 2895 304 9 0
CDI 0 0 0 62 1689 3549 587 3
VCDI 0 0 0 14 19 1177 3182 3876

Date: 2025-05-26:

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 66402 10779 80 19 0 0 0 0
OW 0 1333 701 709 16 0 0 0
VODI 0 28 43 2447 422 3 0 0
ODI 0 0 1 222 3373 115 1 0
CDI 0 0 0 18 920 3988 227 1
VCDI 0 0 0 12 8 634 5852 2062
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 66354 9609 70 31 0 0 0 0
OW 48 2353 480 737 23 0 0 0
VODI 0 175 255 2074 770 34 0 0
ODI 0 2 19 446 2477 540 21 0
CDI 0 1 1 119 1414 2944 1173 6
VCDI 0 0 0 20 55 1222 4886 2057

Date: 2025-05-28:

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 66400 11085 82 51 1 0 0 0
OW 0 1296 622 827 62 5 0 0
VODI 0 38 104 2112 637 26 0 0
ODI 0 0 1 397 2733 242 0 0
CDI 0 0 0 14 1111 3665 694 1
VCDI 0 0 0 9 25 679 5170 2327
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 66400 9911 70 58 1 0 0 0
OW 0 2273 458 978 83 4 0 0
VODI 0 231 255 1661 964 66 0 0
ODI 0 4 26 597 2095 543 6 0
CDI 0 0 0 107 1331 3117 1288 1
VCDI 0 0 0 9 95 887 4570 2327

Date: 2025-05-30:

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 66904 10766 83 47 0 0 0 0
OW 41 1476 594 740 71 1 0 0
VODI 0 54 166 2057 654 14 0 0
ODI 0 4 4 382 2442 250 0 0
CDI 0 0 1 79 1437 2781 1694 62
VCDI 0 0 0 5 11 643 4156 2797
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 66871 9581 86 58 0 0 0 0
OW 74 2205 428 962 101 8 0 0
VODI 0 435 223 1463 982 85 0 0
ODI 0 75 88 554 1982 487 26 0
CDI 0 4 23 262 1541 2936 2581 312
VCDI 0 0 0 11 9 173 3243 2547


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