Description of algorithm
Interpretation of results

Validation of ice thickness - Full domain

Bulletin date: 2023-11-23

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 -0.51   0.71   32638 8137 24471 30
Day 1 forecast -0.53   0.73   32638 8632 23979 27
Day 4 forecast -0.55   0.74   32638 9017 23596 25
Day 7 forecast -0.53   0.72   32638 8385 24225 28
Day 10 forecast -0.61   0.79   32638 10759 21859 20

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 0.064 0.312 0.084 0.01 0.002 0.004
c2 0 0.001 0.08 0.142 0.027 0.002 0.001
c3 0 0 0.009 0.125 0.071 0.007 0.002
c4 0 0 0 0.007 0.033 0.015 0.001
c5 0 0 0 0 0 0 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 0.001 0 0 0
c1 0 0.064 0.318 0.089 0.011 0.002 0.004
c2 0 0.001 0.074 0.147 0.028 0.002 0.001
c3 0 0 0.009 0.115 0.071 0.007 0.001
c4 0 0 0 0.006 0.031 0.015 0.001
c5 0 0 0 0 0 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 0.001 0.001 0 0 0
c1 0 0.064 0.319 0.087 0.011 0.002 0.004
c2 0 0 0.073 0.151 0.029 0.002 0.002
c3 0 0 0.009 0.113 0.07 0.007 0.001
c4 0 0 0 0.006 0.032 0.016 0.001
c5 0 0 0 0 0 0 0
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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