FLEXTRA at ECMWF
The FLEXTRA environment
At ECMWF version 5.0 of FLEXTRA is centrally installed on ecgate, ATOS and on some internal Linux-based systems. On these systems (with the exception of ATOS) Metview is configured to pick up the FLEXTRA executable location automatically via this preset environment variable:
MV_FLEXTRA_EXE
On the ATOS supercomputer you need to set this variable manually for your Metview session.
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) |
512 |
nxmax |
includepar |
Maximum number of grid points in N-S (input grid) |
361 |
nymax |
includepar |
Maximum dimension of (u,v) wind fields in z direction (input grid) |
138 |
nuwzmax |
includepar |
Maximum dimension of (w) wind fields in z direction (input grid) |
138 |
nwzmax |
includepar |
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.
Fix bug when a limited area domain is incorrectly detected as global
In gridcheck.f add this code to line 276:
