Compset Naming: first letter
Background
The configuration of an E3SM case is specified by a long string called a “component set”. Here is an example for an atmosphere-only case:
1850_CAM5%CMIP6_CLM45%SPBC_CICE%PRES_DOCN%DOM_SROF_SGLC_SWAV
That’s a lot to type so every compset has a shorter alias and the first letter in that alias indicates what combination of components are full active models or not. The alias for the above is:
F1850C5-CMIP6
The meaning of the first letter in the component set alias is inherited from CESM and has a long history. The below table is modified from http://www.cesm.ucar.edu/models/cesm1.0/cesm/cesm_doc_1_0_4/x42.html but these conventions date back to when the model was called CCSM.
In the table below, you’ll see components like “datm” and “swav”. To turn off feedbacks, active components can be substituted by a version that just sends data e.g. “datm” is a data atmosphere model. A “data” model sends real values for all expected fields (from files) to the coupler so that the rest of the system can’t tell if its a full model or not.
In some cases you don’t even need a data model. You just need something for the coupler to call in the place it expects. A “stub” model serves this purpose. e.g. “swav” is a stub wave model. No data is sent.
Also in the table below, “glc” is the land-ice model (because it used to be called the “glacier” model).
To distinguish between CESM and E3SM cases, we adopted different naming for some compset aliases including using multiple letters.
Original letters
Designation | Components | Details |
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