Description of algorithm
Interpretation of results

Validation of ice thickness - Full domain

Bulletin date: 2019-11-21

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 -0.9   0.99   26188 16285 9888 15
Day 1 forecast -0.89   0.98   26188 15878 10297 13
Day 4 forecast -0.89   0.98   26188 15972 10204 12
Day 7 forecast -0.87   0.96   26188 15350 10823 15
Day 10 forecast -0.89   0.98   26188 15852 10323 13

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 0.001 0 0 0 0
c1 0 0.07 0.271 0.234 0.065 0.005 0.001
c2 0 0 0.015 0.087 0.124 0.04 0.002
c3 0 0 0.006 0.023 0.031 0.015 0.002
c4 0 0 0 0.004 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 0.001 0 0 0 0
c1 0 0.07 0.268 0.231 0.064 0.005 0.001
c2 0 0 0.016 0.088 0.12 0.038 0.001
c3 0 0 0.006 0.026 0.037 0.017 0.002
c4 0 0 0 0.003 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 0.001 0 0 0 0
c1 0 0.07 0.267 0.228 0.063 0.005 0.001
c2 0 0 0.017 0.09 0.12 0.037 0.001
c3 0 0 0.007 0.027 0.038 0.018 0.002
c4 0 0 0 0.004 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 7 forecast


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