CESM Models

POP2 Port Validation


CCSM 4.0 POP2 PORT Validation

In a successful port, CCSM POP2 ocean-model solutions are expected to be the same "to roundoff level" as solutions generated on a trusted machine, although determining what is and what is not roundoff level is somewhat difficult and subjective. Presently no automated testing tools exist for validating the successful port of the CCSM POP2 model to a new system.

In order to facilitate the evaluation of a successful port, we suggest that you set up and run on your local machine the cases described in the Port Validation Procedure document below.

When time permits, we plan to create scripts to automatically set up and run those cases, but until then, you will need to apply these steps manually.

Following the successful execution of these cases, you can use the ncl SSH RMS difference script to create plots and compare them with the results linked below in the "Port-Validation Plots" section in order to validate your port.

Port-Validation Procedure

Port-Validation RMS Difference Script


Port-Validation Plots

The following plots illustrate a successful port to the NCCS Cray XT jaguar. The plots display timeseries of RMS differences of the SSH field between the jaguar solutions and those generated on a "trusted machine," the NCAR IBM bluefire.

Note that the time axis on the following plots is in the range [366.0,370.], because the cases start from year 1; thus the plots show results for the first five days of a startup run.

The following plots illustrate acceptable RMS SSH differences in POP2 solutions on trusted machines (bluefire and jaguar) due to differences in pe count and convergence criteria.

Port-Validation Data

Port validation datasets generated on bluefire and jaguar are available on the NCAR mss in the following two tar files. The datasets were generated using the ccsm4_0_rel05 tag on March 26 and 24, 2010.