text: In summing up their discussion of the subject, therefore, Laxon et al. simply state that their results ???show that errors are present in current simulations of Arctic sea ice,?? and they thus conclude, in the closing sentence of their paper, that ???until models properly reproduce the observed high-frequency, and thermodynamically driven, variability in sea ice thickness, simulations of both recent, and future, changes in Arctic ice cover will be open to question.??