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License
Only licensed users are provided with the username and password to access the OpenIFS ftp site. OpenIFS is provided free-of-charge per institution. Please see OpenIFS Licensing for more details or email openifs-support@ecmwf.int.
OpenIFS directory layout
The OpenIFS installation consists of (i) OpenIFS source code; (ii) OpenIFS auxiliary anciliary files (climatologies, radiation tables, vertical coord tables). Both types are provided as gzipped tarfiles.
It's recommended that the OpenIFS auxiliary anciliary files are stored in a separate directory, typically named 'ifsdata' and not within the model source code. As discussed in the previous section, the ecCodes GRIB library could be stored under a directory called 'ecmwf' available to other users. The auxiliary ancilliary files could be stored in the same location.
Layout of OpenIFS
auxiliaryanciliary files: ifsdata
Download instructions for the auxiliary anciliary files are below. They are provided as gzipped tarfiles and unpack into the directory structure shown below.
For OpenIFS version '40r1' the layout is very similar, except 'climate.v015' is called 'climate' (43r3 uses an updated climatology). Do not use the climatology files from 40r1 with 43r3.
Note that the 'ifsdata' directory needs to be created first.
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Layout of OpenIFS source files
Download instructions for the OpenIFS source files are below. The gzipped tarfile will unpack into a directory structure shown below (not all sub-directories are shown for brevity).
Other versions of OpenIFS may have different directories and directory names but will be similar to the figure below.
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OpenIFS ftp site contents
All the files related to the OpenIFS models are available from the ftp site: ftp.ecmwf.int. If you do not have ftp site password, please email : openifs-support@ecmwf.int. Only licensed institutes are provided with access.
The OpenIFS models are distributed as compressed tarfiles and include source code, auxiliary anciliary datafiles and supporting software. Once logged into the ftp site you will see the following directories:
Contents of ftp.ecmwf.int | Description |
---|---|
case_studies/ | Some example forecast experiments (initial data & namelists). |
data/ | OpenIFS auxiliary data files (described above). |
src/openifs/ | OpenIFS source code tar files. |
src/scm/ | Single Column model code and files. |
src/osm-htessel/ | Offline Surface Model (HTESSEL) code and files. |
metview/ | Metview macros for use with OpenIFS. |
user_workshops/ | Files used in OpenIFS user workshops. |
users/ | User group specific space. Model initial files provided for users will be found here. |
Contents of directory src/openifs: | Description |
---|---|
src/openifs/43r3/ | Contains OpenIFS versions based on Cycle 43 Release 3 of the operational IFS. |
src/openifs/40r1/ | Contains OpenIFS versions based on Cycle 40 Release 1 of the operational IFS. |
Download OpenIFS source code
To obtain the source code from the ftp site, change directory to the '43r3' directory and retrieve the latest source code (the filename may be different):
Code Block | ||||
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% ftp ftp.ecmwf.int user: openifs pass: <enter the password given to you by openifs-support> cd src/openifs/43r3 ls get oifs43r3v1.tar.gz get md5sum.txt quit |
Verify download
Download the md5sum.txt file to verify the download was correct.
Code Block |
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% md5sum --check md5sum.txt oifs43r3v1.tar.gz: OK |
Using lftp instead of ftp
If your site or workstation only provides the 'lftp' command rather than 'ftp', proceed as shown below:
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% lftp ftp.ecmwf.int lftp ftp.ecmwf.int:~> set ftp:ssl-allow no lftp ftp.ecmwf.int:~> user openifs Password: <enter the password lftp openifs@ftp.ecmwf.int:/> cd src/openifs/43r3 lftp openifs@ftp.ecmwf.int:/src/openifs/43r3/> get oifs43r3v1.tar.gz lftp openifs@ftp.ecmwf.int:/src/openifs/43r3/> get md5sum.txt lftp openifs@ftp.ecmwf.int:/src/openifs/43r3/> exit |
Note |
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The 'set ftp:ssl-allow no' command is crucial to allow lftp to work with the ftp server at ECMWF. It disables use of a secure connection. Remember to use the md5sum command (shown above) to verify the download was correct. |
Unpack OpenIFS source code
Unpack the gzipped tarfile into a directory:
Code Block |
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% tar zxf oifs43r3v1.tar.gz % ls oifs43r3v1 CHANGES COPYING NOTICE READMEs examples make src t21test_xios CITE LICENSE README bin fcm oifs-config.editme.sh t21test tools |
If your version of the 'tar' command does not support gzipped archives then do it in two stages:
Code Block |
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% gzip -d oifs40r1v2.tar.gz % tar xf oifs40r1v2.tar |
Download OpenIFS
auxiliaryanciliary data files
The data directory contains the following gzipped tarfiles, all of which should be downloaded.
Contents of directory data: | Description |
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43r3/ | Contains data files for versions of OpenIFS 43r3. Note that the files for 43r3 are split into different resolutions unlike 40r1. Only download the resolutions you plan to work with as these files can be large. |
43r340r1/ | Contains data files for versions of OpenIFS 43r340r1. |
Info |
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These files are the same for all OpenIFS experiments. To save space for multiple users, it's recommended they are placed somewhere central and not copied to each user run directory. The sample job scripts provided assume that links are created from these files to the user run directory. We suggest creating a directory ifsdata somewhere and unpacking the files there. |
Filename | Size | Description |
---|---|---|
<version>/ifsdata_climatology_<version>.tgz | 15Mb | Contains the various long-lived gases and aerosol climatologies used by the model.e.g. files C11CLIM, MCICA, etc. Unpacks into a directory called <version>/ifsdata. |
<version>/ifsdata_<version>_climate*_<res>.tgz | varies | Contains ozone climatology for all supported horizontal and vertical resolutions, including full and reduced Gaussian grid versions. Note the 43r3 files are split into grid types, unlike 40r1. If you intend to work with cubic grids and linear grids, make sure you download both files for each resolution you plan to use. Unpacks into a directory: <version>/climate/<resolution><grid_type>. These contain data split one file per horizontal resolution with a suffix that corresponds to the type of model grid. For example '40r1/climate/159l_2', would correspond to the OpenIFS 40r1 model release, with a T159 linear grid. For further explanation of the model grid types, please see the user guide section on grid resolution. If you want to To save space, it's recommended you can download just the resolutions you intend working with, as the higher resolution files are large. |
<version>/ifsdata_rtables_<version>.tgz | <1Mb | Contains namelists defining the supported grid resolutions for the radiation scheme. File name suffix refers to the type of grid and last 3 digits refers to the horizontal resolution. Unpacks to a directory: <version>/rtables |
<version>/ifsdata_vtables_<version>.tgz | <1Mb | Contains namelists defining the coefficients for the supported vertical resolutions. File name suffix refers to the number of levels. Unpacks to a directory: <version>/vtables. |
<version>/ifsdata_namelist_<version>.tgz | <1Mb | Contains the full model namelist set for this OpenIFS version. Unpacks to a directory: <version>/namelist. |
To unpack the files either use the tar zxf
command if your version of tar supports the 'z' option, or use gunzip
followed by tar xf
.
. |
Code Block | ||||
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% mkdir oifs/ifsdata
% cd oifs/ifsdata
% ftp ftp.ecmwf.int
Connected to ftp.ecmwf.int.
Name (ftp.ecmwf.int): openifs
331 User openifs OK. Password required
ftp> cd data/43r3
ftp> prompt
ftp> get md5sum.txt
ftp> mget ifsdata*43r3.tgz
ftp> mget ifsdata*_159*.tgz
ftp> mget ifsdata*_255*.tgz
ftp> mget ifsdata*_319*.tgz
ftp> quit
% md5sum --check md5sum.txt # note this will report on missing files, but check those downloaded are ok.
% for ff in *.tgz; do tar zxf $ff; done
% ls 43r3
climate.v015 ifsdata namelist rtables vtables
% ls 43r3/climate.v015
159_3 159_4 159l_2 21_full 255_3 255_4 255l_2 |
Info |
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Make sure you download both grid types for each resolution. e.g. ifsdata_cy43r3_climate.v015_159.tgz (cubic grids) and ifsdata_cy43r3_climate.v015_159l.tgz (linear/full grids) if you intend working with both grid types. For more information about OpenIFS model grids, see: Grids. |
Code Block | ||||
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% mkdir oifs/ifsdata % cd oifs/ifsdata % ftp ftp.ecmwf.int Connected to ftp.ecmwf.int. Name (ftp.ecmwf.int): openifs 331 User openifs OK. Password required ftp> cd data/40r1 ftp> prompt ftp> mget ifsdata_*.tgz ftp> quit % for ff in *.tgz; do tar zxf $ff; done % rm *.tar.gz |
There is no md5sum.txt file available for 40r1 files.
OpenIFS 40r1 expects the vtables and rtables directories to be at the same directory level as the 40r1 directory. This was changed in later versions of OpenIFS.
To allow for this, make links from the 'oifs/ifsdata' created above:
Code Block |
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% cd oifs/ifsdata % ln -s 40r1/vtables vtables % ln -s 40r1/rtables rtables % ls 40r1 vtables rtables |
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