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Tobias Selz, Lotte Bierdel, and George C. Craig

-dimensional spectra are then obtained through radial sums of the two-dimensional DCT spectra (see, e.g., Errico 1985 ). In the present study, the spectra are displayed as a function of wavelength , and spectral slopes are obtained with a least squares fit in double-logarithmic space. Horizontal scales smaller than are below the model’s effective resolution and are therefore not considered ( Bierdel et al. 2012 ). The largest spectral mode might be influenced too much by boundary effects and is also discarded

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Tobias Selz

here only hold on average over many cases. We used 12 cases distributed over 1 year, which result in 24 midlatitude flow realizations if both hemispheres are considered. However, the intrinsic predictability seems to be flow dependent and varies depending on the metric that has been used up to 10 forecast days, which indicates that there are flow conditions with higher and lower intrinsic predictability. Seasonal and hemispheric subsamples show however only slight differences with higher intrinsic

Open access