Description of algorithm Interpretation of results

Validation of ice thickness - Full domain

Bulletin date: 2018-05-24

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	-1.06	1.21	28184	12073	16069	42
Day 1 forecast	-1.06	1.21	28184	12056	16087	41
Day 4 forecast	-1.06	1.21	28184	12076	16068	40
Day 7 forecast	-1.06	1.21	28184	12037	16102	45
Day 10 forecast	-1.06	1.21	28184	12104	16043	37

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	0.003	0.029	0.096	0.06	0.028	0.011
	c2	0	0	0.004	0.049	0.126	0.09	0.035
	c3	0	0	0.001	0.031	0.143	0.112	0.069
	c4	0	0	0	0.002	0.017	0.025	0.052
	c5	0	0	0	0.001	0.001	0.002	0.008
	c6	0	0	0	0	0.001	0.001	0.002

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	0.003	0.029	0.095	0.059	0.027	0.011
	c2	0	0	0.004	0.048	0.127	0.09	0.036
	c3	0	0	0.001	0.032	0.145	0.114	0.07
	c4	0	0	0	0.002	0.015	0.025	0.051
	c5	0	0	0	0.001	0.001	0.001	0.008
	c6	0	0	0	0	0.001	0.001	0.002

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	0.001	0	0	0
	c1	0	0.002	0.029	0.095	0.059	0.027	0.011
	c2	0	0	0.004	0.048	0.127	0.089	0.036
	c3	0	0	0.001	0.031	0.145	0.114	0.07
	c4	0	0	0	0.002	0.016	0.025	0.051
	c5	0	0	0	0.001	0.001	0.001	0.008
	c6	0	0	0	0	0.001	0.001	0.002

See category definitions for details.

Statistical distribution

Sea ice thickness, day 7 forecast

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