Description of algorithm
Interpretation of results

Validation of ice thickness - Full domain

Bulletin date: 2017-10-19

Model: ARC MFC - TOPAZ

Data source: UCL CryoSAT-2 sea ice thickness

Validation statistics summary

Bias (m) RMS (m) total grids low SIT OK SIT high SIT
Best estimate -0.8   0.91   20121 10947 9117 57
Day 1 forecast -0.8   0.92   20121 10974 9088 59
Day 4 forecast -0.8   0.92   20121 11016 9042 63
Day 7 forecast -0.79   0.91   20121 10704 9356 61
Day 10 forecast -0.81   0.92   20121 11085 8985 51

Numbers in the three rightmost columns are grid counts. Regions with high/low sea ice thickness correspond to areas with model offsets from the gridded observations outside of one standard deviation. (Standard deviations are provided in the observational product.)


Definition of categories:

Category   Sea ice thickness   
c1<1m
c21 - 1.5m
c31.5 - 2m
c42 - 2.5m
c52.5 - 3m
c6>3m

Best estimate vs. observations

Contingency table

observations
open c1 c2 c3 c4 c5 c6
m
o
d
e
l
open 0 0 0.002 0 0 0 0
c1 0 0.052 0.259 0.265 0.068 0.001 0.001
c2 0 0.001 0.028 0.096 0.072 0.002 0.001
c3 0 0 0.009 0.032 0.063 0.011 0.001
c4 0 0 0.002 0.005 0.011 0.008 0.003
c5 0 0 0 0.001 0.002 0.001 0.002
c6 0 0 0 0 0 0 0

See category definitions for details.

Statistical distribution

Observed sea ice thickness from CryoSAT

Sea ice thickness, best estimate product

Day 1 forecast vs. observations

Contingency table

observations
open c1 c2 c3 c4 c5 c6
m
o
d
e
l
open 0 0 0.001 0 0 0 0
c1 0 0.051 0.255 0.265 0.068 0.001 0.001
c2 0 0.003 0.031 0.093 0.077 0.004 0.001
c3 0 0 0.01 0.036 0.06 0.011 0.002
c4 0 0 0.001 0.004 0.009 0.007 0.002
c5 0 0 0 0.001 0.003 0.001 0.002
c6 0 0 0 0 0 0 0

See category definitions for details.

Statistical distribution

Sea ice thickness, day 1 forecast

Day 7 forecast vs. observations

Contingency table

observations
open c1 c2 c3 c4 c5 c6
m
o
d
e
l
open 0 0 0.001 0 0 0 0
c1 0 0.051 0.255 0.262 0.068 0.001 0.001
c2 0 0.003 0.031 0.096 0.076 0.003 0.001
c3 0 0 0.01 0.037 0.061 0.012 0.002
c4 0 0 0.001 0.004 0.009 0.007 0.002
c5 0 0 0 0.001 0.002 0.001 0.002
c6 0 0 0 0 0 0 0

See category definitions for details.

Statistical distribution

Sea ice thickness, day 7 forecast


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