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

Validation of sea ice concentration - American sector

Bulletin date: 2025-07-24

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

Model vs. observations, sea ice class contingency tables

Date: 2025-07-18:

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 8393 4206 19 10 3 4 0 0
OW 39 1103 255 284 35 7 0 0
VODI 6 113 152 1226 876 30 0 0
ODI 0 12 8 141 3557 1419 0 0
CDI 0 24 7 36 4333 14601 1334 0
VCDI 0 0 0 30 500 1649 1454 0
...date precedes bulletin

Date: 2025-07-20:

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 8705 4352 21 13 0 0 0 0
OW 36 1082 280 319 35 2 0 0
VODI 0 182 176 1173 1262 55 0 0
ODI 0 26 16 208 2769 957 0 0
CDI 0 26 10 47 2654 16189 2010 0
VCDI 0 3 3 85 418 1501 1251 0
...date precedes bulletin

Date: 2025-07-22:

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 10406 3535 44 8 0 0 0 0
OW 22 817 440 420 16 1 0 0
VODI 0 54 67 1502 830 14 0 0
ODI 0 16 6 106 5990 687 0 0
CDI 0 32 20 112 2243 13665 977 0
VCDI 0 0 2 33 300 3107 394 0
...date precedes bulletin

Date: 2025-07-24:

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 10436 3685 86 24 1 0 0 0
OW 17 822 378 481 33 0 0 0
VODI 0 81 100 1831 788 24 0 0
ODI 0 15 5 153 4237 1850 0 0
CDI 0 50 38 80 2941 12499 459 0
VCDI 0 4 11 65 588 3262 822 0
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 10432 3748 105 46 1 0 0 0
OW 21 755 354 425 31 0 0 0
VODI 0 85 104 1804 692 29 0 0
ODI 0 15 6 214 4499 1982 0 0
CDI 0 50 39 91 2840 12030 450 0
VCDI 0 4 10 54 525 3594 831 0

Date: 2025-07-26:

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 10719 3632 72 36 2 0 0 0
OW 15 916 367 502 33 0 0 0
VODI 1 138 126 1783 879 13 0 0
ODI 0 21 8 171 4404 910 0 0
CDI 0 76 37 65 4614 10662 1135 0
VCDI 0 14 17 92 709 3151 546 0
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 10715 3693 91 54 4 0 0 0
OW 19 829 332 431 41 1 0 0
VODI 1 161 137 1724 798 19 0 0
ODI 0 23 13 277 4643 1234 0 0
CDI 0 77 40 87 4401 9374 1167 0
VCDI 0 14 14 76 754 4108 514 0

Date: 2025-07-28:

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 10781 4307 120 35 0 0 0 0
OW 2 881 511 434 16 0 0 0
VODI 0 50 77 2111 607 5 0 0
ODI 0 37 18 124 6830 106 0 0
CDI 0 36 14 97 2295 13131 359 0
VCDI 0 0 0 1 92 694 2095 0
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 10780 3893 101 77 4 0 0 0
OW 2 1006 316 412 44 19 0 0
VODI 1 231 254 1766 747 71 0 0
ODI 0 36 17 355 3905 1259 11 0
CDI 0 100 26 75 3818 7602 1395 0
VCDI 0 45 26 117 1322 4985 1048 0

Date: 2025-07-30:

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 11111 3939 74 22 0 0 0 0
OW 23 987 426 550 19 0 0 0
VODI 3 98 121 2449 980 8 0 0
ODI 0 38 12 296 4812 1187 0 0
CDI 0 40 31 100 2813 12299 31 0
VCDI 0 0 1 7 62 2946 381 0
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 11103 3574 75 80 3 0 0 0
OW 27 1031 261 506 63 0 0 0
VODI 6 295 255 2016 733 73 0 0
ODI 1 30 18 664 3233 1921 0 0
CDI 0 105 18 46 3510 8156 21 0
VCDI 0 67 38 112 1144 6290 391 0

Date: 2025-08-01:

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 11184 3810 68 26 0 0 0 0
OW 21 1204 431 479 39 0 0 0
VODI 3 208 322 2964 733 9 0 0
ODI 0 54 19 521 3741 1755 96 0
CDI 0 65 34 99 3126 8687 2592 0
VCDI 0 0 0 2 56 1390 2128 0
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 11187 3414 80 92 8 0 0 0
OW 16 1145 277 466 62 1 0 0
VODI 5 527 425 2003 511 78 0 0
ODI 0 45 26 1321 2292 1882 257 0
CDI 0 159 41 158 4296 6111 3566 0
VCDI 0 51 25 51 526 3769 993 0


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