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

Validation of sea ice concentration - American sector

Reference date: 2025-05-22

Model: GLO MFC - NEMO

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

Model vs. observations, sea ice class contingency tables

Date: 2025-05-16:

Best estimate
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 0 43 1 3 0 0 0 0
OW 0 6 2 12 2 0 0 0
VODI 0 33 16 125 94 13 0 0
ODI 0 134 62 347 621 82 21 0
CDI 0 140 17 223 1169 2080 1937 41
VCDI 0 0 0 1 64 1520 16252 20805

Date: 2025-05-18:

Best estimate
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 0 27 12 10 0 0 0 0
OW 0 13 8 35 0 0 0 0
VODI 0 34 20 223 110 13 0 0
ODI 0 119 47 387 700 178 11 0
CDI 0 2 1 94 925 2195 960 89
VCDI 0 0 0 0 59 1526 15062 23006

Date: 2025-05-20:

Best estimate
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 0 58 22 33 0 0 0 0
OW 0 40 23 30 0 0 0 0
VODI 0 36 58 199 96 5 0 0
ODI 0 107 39 435 616 222 61 0
CDI 0 0 3 200 939 2654 819 17
VCDI 0 0 0 0 20 1407 14561 23166

Date: 2025-05-22:

Best estimate
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 0 98 39 15 0 0 0 0
OW 0 54 43 58 0 2 0 0
VODI 0 51 48 238 68 32 1 0
ODI 0 127 48 462 631 270 47 0
CDI 0 23 19 298 947 2820 879 40
VCDI 0 0 0 0 42 1000 11869 25597

Date: 2025-05-24:

Best estimate
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 0 130 70 53 0 0 0 0
OW 0 59 39 56 1 0 0 0
VODI 0 73 80 263 86 23 0 0
ODI 0 111 58 504 768 206 21 0
CDI 0 46 34 329 962 3175 1085 0
VCDI 0 0 0 0 24 1830 11742 24038

Date: 2025-05-26:

Best estimate
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 0 236 84 83 2 0 0 0
OW 0 77 35 43 11 2 0 0
VODI 0 108 79 261 120 39 3 0
ODI 0 127 37 488 816 267 13 0
CDI 0 65 23 317 1161 3974 1534 23
VCDI 0 0 0 0 117 1588 16968 17165

Date: 2025-05-28:

Best estimate
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 0 475 130 154 17 0 0 0
OW 0 84 43 94 44 2 0 0
VODI 0 113 48 296 237 31 0 0
ODI 0 142 53 491 864 141 1 0
CDI 0 37 28 324 3395 3049 921 21
VCDI 0 0 0 3 226 1817 15097 17488

Date: 2025-05-30:

Best estimate
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 0 677 131 155 26 0 0 0
OW 0 88 22 60 132 0 0 0
VODI 0 110 51 177 275 59 1 0
ODI 0 173 73 618 991 226 9 0
CDI 0 23 17 400 1573 4308 1918 12
VCDI 0 0 0 21 153 4688 14829 13870


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