Description of algorithm
Interpretation of results

Validation of ice thickness - Full domain

Bulletin date: 2019-11-14

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   25901 17354 8540 7
Day 1 forecast -0.91   0.99   25901 17126 8768 7
Day 4 forecast -0.91   1   25901 17293 8601 7
Day 7 forecast -0.89   0.98   25901 16685 9207 9
Day 10 forecast -0.93   1.01   25901 17638 8256 7

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 0.057 0.276 0.25 0.059 0.003 0.002
c2 0 0 0.018 0.084 0.132 0.039 0.001
c3 0 0 0.006 0.024 0.028 0.015 0.003
c4 0 0 0 0.002 0.002 0 0
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 0 0 0
c1 0 0.057 0.276 0.25 0.058 0.003 0.002
c2 0 0 0.018 0.081 0.128 0.038 0.001
c3 0 0 0.005 0.029 0.033 0.015 0.003
c4 0 0 0 0.001 0.001 0 0
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 0 0 0 0
c1 0 0.057 0.275 0.246 0.057 0.003 0.002
c2 0 0 0.019 0.084 0.128 0.038 0.001
c3 0 0 0.006 0.029 0.034 0.015 0.003
c4 0 0 0 0.002 0.002 0 0
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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