Validation of sea ice concentration

Bulletin date: 2021-07-29

Model vs. observations, sea ice class contingency tables

Date: 2021-07-23:

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 18845 7570 2661 830 211 71 72 0
OW 0 0 105 179 172 75 38 0
VODI 0 0 27 167 274 164 131 0
ODI 0 0 2 29 114 259 633 0
CDI 0 0 0 10 68 327 2156 2079
VCDI 0 0 0 0 0 0 111 779
...date precedes bulletin

Date: 2021-07-27:

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 20821 6094 2441 900 268 64 60 0
OW 0 0 79 150 128 58 32 0
VODI 0 0 56 115 247 168 101 0
ODI 0 0 16 31 109 411 703 31
CDI 0 0 0 4 64 293 1900 2403
VCDI 0 0 0 0 0 0 43 369
...date precedes bulletin

Date: 2021-07-29:

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 20980 6228 2142 928 324 77 65 0
OW 0 1 62 140 183 54 31 0
VODI 0 0 50 111 234 125 100 4
ODI 0 0 12 36 154 337 759 46
CDI 0 0 0 11 84 352 1783 2686
VCDI 0 0 0 0 0 0 18 42
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 20980 6226 2140 922 332 84 63 0
OW 0 3 55 131 158 38 32 0
VODI 0 0 53 115 254 130 94 4
ODI 0 0 18 44 146 364 823 45
CDI 0 0 0 14 89 329 1721 2631
VCDI 0 0 0 0 0 0 23 98

Date: 2021-08-02:

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 21128 6215 2500 811 286 59 12 0
OW 0 0 64 150 116 38 7 0
VODI 0 0 20 98 188 168 52 0
ODI 0 0 0 33 167 456 460 12
CDI 0 0 0 3 28 478 1932 2287
VCDI 0 0 0 0 0 0 56 335
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 21128 6215 2393 767 282 57 12 0
OW 0 0 87 146 94 51 6 0
VODI 0 0 85 132 177 154 92 0
ODI 0 0 19 38 167 328 816 51
CDI 0 0 0 12 65 609 1572 2574
VCDI 0 0 0 0 0 0 21 9

Date: 2021-08-04:

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 21857 6174 2083 667 283 55 5 0
OW 0 0 71 130 112 61 4 0
VODI 0 0 16 105 189 181 48 0
ODI 0 0 1 25 202 486 419 18
CDI 0 0 0 5 49 589 2019 1919
VCDI 0 0 0 0 0 0 101 285
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 21857 6160 1948 636 290 55 5 0
OW 0 13 101 120 87 62 9 0
VODI 0 1 97 124 152 143 100 5
ODI 0 0 25 36 205 372 743 37
CDI 0 0 0 16 101 740 1721 2175
VCDI 0 0 0 0 0 0 18 5

Date: 2021-08-06:

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 21845 6199 2301 584 258 45 4 0
OW 0 0 89 129 124 60 16 0
VODI 0 0 22 85 195 190 56 0
ODI 0 0 1 38 189 472 459 5
CDI 0 0 0 10 81 518 2031 1745
VCDI 0 0 0 0 1 0 125 282
observations
Ice free Ice free
near MIZ
OW VODI ODI CDI VCDI
near MIZ
VCDI
m
o
d
e
l
Ice free 21845 6195 2137 570 278 49 7 0
OW 0 4 145 108 95 74 14 0
VODI 0 0 93 100 171 170 134 13
ODI 0 0 38 49 191 363 744 35
CDI 0 0 0 19 112 629 1776 1979
VCDI 0 0 0 0 1 0 16 5


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