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Although the results of the perturbation growth test do not provide definitive port validity, we find the test to be extremely useful because it fails reliably, indicating that there is a problem with the port that needs to be fixed before incurring the expense of a full climate simulation.

Each model configuration listed below is linked to a tar file that contains: CAM-5.0 (CESM-1.0), Finite-Volume dycore, 1.9x2.5-L26, IBM Power6.

[details] CAM-5.2 (CESM-1.1.1), Finite-Volume dycore, 1.9x2.5-L26, IBM i Data Plex.

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The validation technique discussed here is only applicable to the cam4 physics package.

The CAM-5 model can be configured to run with the cam4 physics package via the "-phys cam4" argument to CAM's configure command. Below we outline an inexpensive procedure based on a perturbation growth test that can establish port validity of the cam4 physics package and other simple CAM configurations (e.g., adiabatic or ideal physics) with reasonable confidence.

While it is highly likely that a successful perturbation growth test indicates a valid port, the ultimate assurance that ported code is running correctly comes from running a full climate simulation and comparing it to a control simulation produced by the trusted model.

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