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Example KE spectra. Plotted is the “compensated” spectra, E(k)*k^5/3, to better illustrate the possible transition to ^-5/3. E(k) was computed from many flow snapshots and then E(k) is averaged over all the results to get the nice curves shown below. Unfortunately, one cannot compute E(k) from time averaged flow fields.
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In CAM4 at 1/8 degree (14km) resolution the model had a nice Nastrom-Gage transition. This has slowly deteriorated, perhaps due to increased dissipation being added to the model as it the physics has evolved. It may also have been that CAM4 had this transition for the wrong reasons. CAM5.3 is EAM V0. It will be interesting to see the specta spectra for higher resolutions now that we are able to run at 6km and 3km resolutions.
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