The authors have tested the response of certain versions of atmospheric general circulation models (GCMs) to random perturbations in initial conditions while leaving external and boundary conditions unaltered. By means of time averaging and global space averaging, the reduction of the level of noise inherent in the models was investigated. In this way, comparisons of the magnitude of the models' response to advertent changes can be used to determine the significance of prescribed (nonrandom) perturbation experiments. This paper is intended to present preliminary results from two GCMs (NCAR and RAND) and may be useful for those contemplating using GCMs for climate or perturbation experiments. 12 pp. Ref.
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