Description of algorithm Interpretation of results

Validation of ice thickness - Full domain

Bulletin date: 2019-12-26

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	-0.8	0.9	31298	13883	17370	45
Day 1 forecast	-0.8	0.9	31298	13837	17417	44
Day 4 forecast	-0.8	0.9	31298	14087	17166	45
Day 7 forecast	-0.78	0.88	31298	13221	18031	46
Day 10 forecast	-0.81	0.91	31298	14218	17036	44

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.)

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Definition of categories:

Category	Sea ice thickness
c1	<1m
c2	1 - 1.5m
c3	1.5 - 2m
c4	2 - 2.5m
c5	2.5 - 3m
c6	>3m

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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	0.049	0.304	0.224	0.055	0.007	0.002
	c2	0	0	0.018	0.096	0.074	0.01	0.001
	c3	0	0	0.002	0.036	0.065	0.041	0.007
	c4	0	0	0.001	0.004	0.003	0.001	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	0	0	0
	c1	0	0.049	0.303	0.224	0.055	0.007	0.002
	c2	0	0	0.018	0.096	0.074	0.011	0.001
	c3	0	0	0.002	0.037	0.065	0.039	0.007
	c4	0	0	0.001	0.004	0.002	0.001	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	0	0	0	0
	c1	0	0.049	0.3	0.216	0.054	0.007	0.002
	c2	0	0	0.021	0.103	0.071	0.01	0.001
	c3	0	0	0.002	0.038	0.069	0.042	0.007
	c4	0	0	0.001	0.004	0.002	0.001	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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