Description of algorithm
Interpretation of results

Validation of ice thickness - Full domain

Bulletin date: 2018-10-11

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 -0.91   1.01   15695 9215 6397 83
Day 1 forecast -0.9   1.01   15695 9121 6492 82
Day 4 forecast -0.9   1.01   15695 9107 6507 81
Day 7 forecast -0.9   1.01   15695 9119 6493 83
Day 10 forecast -0.9   1   15695 9039 6587 69

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 0 0 0 0
c1 0 0.034 0.261 0.299 0.14 0.007 0
c2 0 0.001 0.014 0.068 0.088 0.023 0.002
c3 0 0 0.002 0.017 0.019 0.004 0
c4 0 0 0.001 0.006 0.006 0.001 0.001
c5 0 0 0 0.001 0.002 0.001 0
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 0 0 0 0
c1 0 0.034 0.261 0.295 0.139 0.008 0
c2 0 0.001 0.015 0.072 0.088 0.023 0.002
c3 0 0 0.002 0.018 0.02 0.004 0
c4 0 0 0.001 0.006 0.006 0.001 0.001
c5 0 0 0 0.001 0.001 0 0
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 0 0 0 0
c1 0 0.034 0.26 0.295 0.137 0.008 0
c2 0 0.001 0.015 0.071 0.09 0.023 0.002
c3 0 0 0.002 0.018 0.02 0.004 0
c4 0 0 0.001 0.006 0.007 0.001 0.001
c5 0 0 0 0.002 0.001 0 0
c6 0 0 0 0 0 0.001 0

See category definitions for details.

Statistical distribution

Sea ice thickness, day 7 forecast


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