  By performing a large number of fully resolved simulations of incompressible
homogeneous and isotropic two dimensional turbulence, we study the scaling
behavior of the maximal Lyapunov exponent, the Kolmogorov-Sinai entropy and
attractor dimension. The scaling of the maximal Lyapunov exponent is found to
be in good agreement with the dimensional predictions. For the cases of the
Kolmogorov-Sinai entropy and attractor dimension the simple dimensional
predictions are found to be insufficient. A dependence on the system size and
the forcing length scale is found, suggesting non-universal behavior. The
applicability of these results to atmospheric predictability is also discussed.
