3.3 Model and directory structure

The ``numerical'' model is contained within a execution environment support wrapper. This wrapper is designed to provide a general framework for grid-point models. MITgcmUV is a specific numerical model that uses the framework. Under this structure the model is split into execution environment support code and conventional numerical model code. The execution environment support code is held under the eesupp directory. The grid point model code is held under the model directory. Code execution actually starts in the eesupp routines and not in the model routines. For this reason the top-level MAIN.F is in the eesupp/src directory. In general, end-users should not need to worry about this level. The top-level routine for the numerical part of the code is in model/src/THE_MODEL_MAIN.F. Here is a brief description of the directory structure of the model under the root tree (a detailed description is given in section 3: Code structure).

• doc: contains brief documentation notes.

• eesupp: contains the execution environment source code. Also subdivided into two subdirectories inc and src.

• model: this directory contains the main source code. Also subdivided into two subdirectories inc and src.

• pkg: contains the source code for the packages. Each package corresponds to a subdirectory. For example, gmredi contains the code related to the Gent-McWilliams/Redi scheme, aim the code relative to the atmospheric intermediate physics. The packages are described in detail in chapter 6.

• tools: this directory contains various useful tools. For example, genmake2 is a script written in csh (C-shell) that should be used to generate your makefile. The directory adjoint contains the makefile specific to the Tangent linear and Adjoint Compiler (TAMC) that generates the adjoint code. The latter is described in detail in part 8. This directory also contains the subdirectory build_options, which contains the `optfiles' with the compiler options for the different compilers and machines that can run MITgcm.

• utils: this directory contains various utilities. The subdirectory knudsen2 contains code and a makefile that compute coefficients of the polynomial approximation to the knudsen formula for an ocean nonlinear equation of state. The matlab subdirectory contains matlab scripts for reading model output directly into matlab. scripts contains C-shell post-processing scripts for joining processor-based and tiled-based model output. The subdirectory exch2 contains the code needed for the exch2 package to work with different combinations of domain decompositions.

• verification: this directory contains the model examples. See section 3.8.

• jobs: contains sample job scripts for running MITgcm.

• lsopt: Line search code used for optimization.

• optim: Interface between MITgcm and line search code.

Copyright © 2006 Massachusetts Institute of Technology

Last update 2018-01-23