Description of algorithm
Interpretation of results

Validation of ice thickness - Full domain

Bulletin date: 2018-01-04

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 -0.92   1.05   37747 19442 18280 25
Day 1 forecast -0.92   1.05   37747 19412 18311 24
Day 4 forecast -0.93   1.05   37747 19645 18081 21
Day 7 forecast -0.9   1.03   37747 18808 18914 25
Day 10 forecast -0.92   1.05   37747 19520 18206 21

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 0.001 0 0 0.001
c1 0 0.02 0.276 0.213 0.091 0.013 0.006
c2 0 0.001 0.032 0.079 0.071 0.047 0.001
c3 0 0 0.002 0.014 0.04 0.053 0.01
c4 0 0 0 0.002 0.01 0.009 0.006
c5 0 0 0 0 0 0.001 0.001
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 0.001 0 0 0.001
c1 0 0.02 0.277 0.218 0.091 0.013 0.005
c2 0 0.001 0.031 0.075 0.073 0.048 0.001
c3 0 0 0.002 0.014 0.039 0.052 0.01
c4 0 0 0 0.002 0.01 0.009 0.006
c5 0 0 0 0 0.001 0.001 0.001
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 0.001
c1 0 0.02 0.272 0.208 0.088 0.013 0.006
c2 0 0.001 0.035 0.084 0.075 0.048 0.001
c3 0 0 0.002 0.014 0.039 0.052 0.01
c4 0 0 0 0.002 0.01 0.009 0.006
c5 0 0 0 0 0.001 0.001 0.001
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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