The FLEXTRA environment
At ECMWF version 5.0 of FLEXTRA is centrally installed on ecgb and on some internal Linux-based systems. On these systems Metview is configured to pick up the FLEXTRA location automatically via this environment variable:
- MV_FLEXTRA_EXE_PATH: defines the FLEXTRA executable
Hard-coded parameters
Some of the important FLEXTRA parameters cannot be specified at run time but are hard-coded in the source. The FLEXTRA installation at ECMWF uses the following set of hard-coded parameters:
| Description | Value | Parameter in source | Source file |
|---|---|---|---|
| Maximum number of grid points in E-W (input grid) | 721 | nxmax | par_mod.f90 |
| Maximum number of grid points in N-S (input grid) | 361 | nymax | par_mod.f90 |
| Maximum number of model levels (input grid) | 138 | par_mod.f90 | |
| Maximum number of species | 6 | maxspec | par_mod.f90 |
| Maximum number of particles | 2000000 | maxpart | par_mod.f90 |
| Maximum number of age classes | 10 | maxageclass | par_mod.f90 |
| Maximum number of receptor sites | 200 | maxreceptors | par_mod.f90 |
| Maximum number of output grid nests | 0 | maxnests | par_mod.f90 |
Compilation
compiler: gfortran
compilation options:
-O3 -m64 -mcmodel=medium -fconvert=little-endian -frecord-marker=4
Necessary code modifications
To make FLEXTRA work with ECMWF data in the desired way the following modifications were made in the source code:
Make FLEXTRA work for 137 model levels
In includepar modify line 38:
and also modify line 83 in gridcheck.f.
Increase file name buffer length
In includecom modify line 264:
Fix bug when a limited area domain is incorrectly detected as global
In gridcheck.f add this code to line 276:
