What is CIME?¶
CIME, pronounced “SEAM”, contains the support scripts (configure, build, run, test), data models, essential utility libraries, a “main” and other tools that are needed to build a single-executable coupled Earth System Model. CIME is available in a stand-alone package that can be compiled and tested without active prognostic components but is typically included in the source of a climate model. CIME does not contain: any active components, any intra-component coupling capability (such as atmosphere physics-dynamics coupling).
CIME is comprised of:
A Case Control System to support configuration, compilation, execution, system testing and unit testing of a earth system model:
Scripts to enable simple generation of model executables and associated input files for different scientific cases, component resolutions and combinations of full, data and stub components with a handful of commands.
Testing utilities to run defined system tests and report results for different configurations of the coupled system.
A default coupled model architecture:
A programmer interface and libraries to implement a hub-and-spoke inter-component coupling architecture.
An implementation of a “hub” that needs 7 components (atm, ocn, lnd, sea-ice, land-ice, river, wave). a.k.a. “the driver”.
The ability to allow active and data components to be mixed in any combination as long as each component implements the coupling programmer interface.
Non-active Data and Stub components:
“Data-only” versions of 6 of the 7 components that can replace active components at build-time.
“Stub” versions of all 7 components for building a complete system.
- Source code for external libraries useful in scientific applications in general and climate models in particular.
Parallel I/O library.
The Model Coupling Toolkit.
Additional stand-alone tools:
Parallel regridding weight generation program
Scripts to automate off-line load-balancing.
Scripts to conduct ensemble-based statistical consistency tests.
Netcdf file comparison program (for bit-for-bit).