Hi James,
The
ensemble_run flag is one of the parameters that activates the ensembling system. This is a relatively new feature that is described in the latest version of
the RegCM UserGuide, Section 6.1.7.
When the ensembling system is activated, one or more of the boundary condition fields are perturbed by a small fraction each time they are read in. For example, the following settings would use the ensembling strategy of
O'Brien et al. (2011), which is the main reference that describes the details of the ensembling method:
&perturbparam
lperturb_q = .true.
perturb_frac_q = 0.001d0
/
With these settings turned on, each time you run regcm, the output will be slightly different. So to create an ensemble of simulations, you might run RegCM five times, and each time change the parameter
dirout to
output.1, output.2, output.3, output.4,
output.5, etc.
I hope this helps, and please let me know if I can clarify anything.
Kind Regards,
-Travis-
--
Travis O'Brien
Lawrence Berkeley National Lab
(510) 495-8047