Difference between revisions of "7. Retrieve ECMWF fields for FLEXPART"
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− | ''Updated by nik: | + | ''Updated by nik: 12 March 2013'' |
'''The retrieval procedure uses a number of fortran scripts which are run on MARS. In short:''' | '''The retrieval procedure uses a number of fortran scripts which are run on MARS. In short:''' | ||
− | - Retrieves the meteorological model data output from ECMWF | + | - Retrieves the meteorological model data output from ECMWF (see bottom of page for a list of which data are retrieved) |
- De-accumulates atmospheric flux data (FLXACC2 fortran code under source.tar) | - De-accumulates atmospheric flux data (FLXACC2 fortran code under source.tar) | ||
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EXEDIR - (./) - Location of FORTRAN executables | EXEDIR - (./) - Location of FORTRAN executables | ||
SOURCECODE - Location of file source.tar containing source code and makefiles ($HOME/flex_extract_ecgate_V2) | SOURCECODE - Location of file source.tar containing source code and makefiles ($HOME/flex_extract_ecgate_V2) | ||
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+ | == LIST OF METEOROLOGICAL PARAMETERS RETRIEVED FOR FLEXPART == | ||
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+ | FLEXPART-variable Description ParameterID MARS shortName Unit | ||
+ | tth Temperature 130 t K | ||
+ | uuh U-velocity 131 u ms-1 | ||
+ | vvh V-velocity 132 v ms-1 | ||
+ | qvh Specific humidity 133 q kgkg-1 | ||
+ | sp Surface Pressure 134 sp Pa | ||
+ | wwh W-velocity 135 w Pa s-1 | ||
+ | sd Snow depth 141 sd m of water equivalent | ||
+ | msl Sea level pressure 151 msl Pa | ||
+ | tcc Total cloud cover 164 tcc (0-1) | ||
+ | u10 10m U velocity 165 10u ms-1 | ||
+ | v10 10m V velocity 166 10v ms-1 | ||
+ | tt2 2m temperature 167 2t K | ||
+ | td2 2m dew point 168 2d K | ||
+ | lsprec Large scale precipitation 142 lsp m | ||
+ | convprec Convective precipitation 143 cp m | ||
+ | sshf Sensible heat flux 146 sshf Jm-2 | ||
+ | ssr Solar radiation 176 ssr Jm-2 | ||
+ | ewss EW surface stress 180 ewss Nm-2s | ||
+ | nsss NS surface stress 181 nsss Nm-2s | ||
+ | oro Orography 129 z m2s-2 | ||
+ | excessoro Standard error orography 160 sdor ~ | ||
+ | lsm Land-Sea mask 172 lsm (0-1) | ||
+ | |||
+ | Total of 22 parameters are retrieved. | ||
+ | |||
+ | |||
+ | The ParameterID is following the table nr 128. |
Revision as of 16:26, 12 March 2013
Back to ECMWF overview[1]
Updated by nik: 12 March 2013
The retrieval procedure uses a number of fortran scripts which are run on MARS. In short:
- Retrieves the meteorological model data output from ECMWF (see bottom of page for a list of which data are retrieved)
- De-accumulates atmospheric flux data (FLXACC2 fortran code under source.tar)
- Calculates the vertical velocity from the continuity equation (CONVERT2 fortran code under source.tar)
- Prepares the met.files (ENyyyymmddhh) that can be used for FLEXPART.
More details are given in the documents on the webpage:
http://transport.nilu.no/flexpart under Routines for retrieval of FLEXTRA/FLEXPART input data from ECMWF
LIST OF PROCEDURES TO FOLLOW TO RETRIEVE DATA:
If retrieving a small number of files this can be done on ECGATE, but for larger data sets it is recommended to use the supercomputer facilities (HPCE) when logging in (c2a)
1. Need to copy the following directory and files to your home directory on ecgate:
cp -r /home/ms/sbc/flex_extract_ecgate_V4/ YourDestination
List of files needed:
flex_ecmwf_91_global_1.0_ecgate extract_ecmwf_ftpbase seq_control.V4 seq_extract.V4 submit source.tar (contains Fortran90 source files and makefiles for the data processing of vertical fluxes etc)
2. Edit the times in the file seq_control.V4:
./seq_extract.V4 1990 1990 06 06 29 29 1 This extract the files from 1990 06 29 to 1990 06 29 - for 1 day!
3. Check that the file flex_ecmwf_91_global_1.0_ecgate contains the following:
(for an overview over the parameters and what they mean - see bottom of page)
----------------------------------- BEGIN: modification of config file ----------------------------------- cat <<EOF >CONTROL_ERA DAY1 YYYYMMDD1 DAY2 YYYYMMDD2 DTIME 3 FORCE_EPS 0 FORCE_EI 0 FORCE_ERA 0 M_GRID 100 M_LEFT -17800 M_LOWER -9000 M_UPPER 9000 M_RIGHT 18100 M_LEVEL 91 M_RESOL 255 M_GAUSS 1 M_ACCURACY 24 M_OMEGA 0 M_OMEGADIFF 0 M_SMOOTH 179 M_ADDPAR /27/28/173/186/187/188/235/139/39 M_FORMAT GRIB2 GATEWAY ecaccess.ecmwf.int DESTINATION flexpart (or change to another of your MS associations) ECSTORAGE 1 ECTRANS 1 ECFSDIR ectmp:/${USER}/oper_YYYY_MM/ MAILOPS ${USER} MAILFAIL ${USER} EXEDIR . SOURCECODE /home/ms/no/sbc/flex_extract_ecgate_V4 (CHANGE TO YOUR USER!!) EOF ----------------------------------- - END: modification of config file -----------------------------------
It is important to check that the three parameters M_GAUSS=1, M_RESOL=255, M_SMOOTH=179 have the set values as this is optimal for the calculation of vertical velocities for a 1.0 degree grid.
4. In the scripts, reference to the right ECMWF userID must be made.
Use the command
grep $USER *
to list all lines in the files containing a reference to the ECMWF userId and that should be set to your own user.
You will need to change in: submit, seq_control.V4, seq_extract.V4 and flex_ecmwf_91_global_1.0_ecgate
5. Copy the template file flex_ecmwf_91_global_1.0_ecgate to extract_ecmwf_ftpbase
cp flex_ecmwf_91_global_1.0_ecgate extract_ecmwf_ftpbase
6. Run the job:
./submit
7. Check your job:
llq to see all jobs in the queue llq -u $USER to see only jobs for your userID eoj <jobid> provides details on the performance of a running job. (also automatically provided at end of job)
You can also follow your execution on the Web access facilities on ECMWF
You will receive an email notifying the start of the script and the successful completion of the script.
You will also get a file finished.* in your directory indicating that the script successfully completed.
The scripts can take from a few minutes up to a few hours to complete, depending on the load of the MARS system.
8. Possible error messages:
LoadL_starter: The program, extract_ecmwf_ftp01.5046746, exited normally and returned an exit code of 1.
In the file *.out search for "exit" to find the line where exit code 1 is given. Here might be hints to find the error message.
9. Get the files:
The retrieved files are automatically transferred to NILU via ftp using the MS association that you specified under "DESTINATION" and that exist under your account (check this under 2. Logging in and account settings).
If you cannot find your files in the defined NILU-directory, check the directory you specified in flex_ecmwf_91_global_1.0_ecgate * (ECFSDIR ectmp:/${USER}/oper_YYYY_MM/) for where it is temporarily stored on the ECWMF system. Then try ftp it over again using the ftp commands specified under 6. File transfer via ftp
OVERVIEW OVER PARAMETERS THAT MAY BE CHANGED BY THE USER (default values in brackets):
FORCE_E40 - (0) - Retrieve data from class E4 (ERA-40) FORCE_EI - (0) - Retrieve data from class EI (ERA-Interim) FORCE_EPS - (0) - Retrieve data from ensemble prediction system M_STREAM -(OPER)- Allows to retrieve data from IFS experiment M_EXPVER - (1) - Experiment number, necessary for ERA-Interim M_NUMBER - (1) - Forecast leg, necessary for EPS. 1=T399 forecasts, 2=T255 M_GRID -(100) - Horizontal resolution of Lat/Lon grid in 1/100 degree M_RESOL -(159) - Horizontal resolution of spectral fields M_LEVEL - (91) - Number of vertical levels M_LEVELIST -(ALL) - List of vertical levels for MARS request M_ADDPAR - Additional surface parameters (/27/28/173/186/187/188/235/139/39) M_UPPER - Latitude of upper right corner of grid area to be retrieved in Hundredth of a degree (e.g. 3750 for 37.5N) M _LOWER - Latitude of lower left corner of grid area in 1/100 degree M_LEFT - Longitude of lower left corner of grid area in 1/100 degree M_RIGHT - Longitude of upper right corner of grid area in1/100 degree. M_ACCURACY - (24) - Accuracy of GRIB data in bits M_GAUSS - (1) - Calculation of etadot on Lat/Lon grid (0) or on Gaussian grid (1) M_OMEGA - (0) - Retrieve Omega from MARS and put it to file OMEGAyymmddhh M_OMEGADIFF- (0) - Calculate Omega and Dps/Dt from continuity equation for diagnostic purposes and include it in file OMEGAyymmddhh M_SMOOTH - (0) - Spectral truncation of etadot after calculation on Gaussian grid GATEWAY - Name of ECaccess gateway server DESTINATION - Name of destination at ECaccess gateway server ECSTORAGE - (1) - Store EN-files in ECFS file system 0/1 (1) ECTRANS - (1) - Transfer EN-files to gateway server 0/1 (1) ECFSDIR - Destination directory on ECFS file system MAILOPS - List of email addresses for operational log-files MAILFAIL - List of email addresses for failure log-files EXEDIR - (./) - Location of FORTRAN executables SOURCECODE - Location of file source.tar containing source code and makefiles ($HOME/flex_extract_ecgate_V2)
LIST OF METEOROLOGICAL PARAMETERS RETRIEVED FOR FLEXPART
FLEXPART-variable Description ParameterID MARS shortName Unit tth Temperature 130 t K uuh U-velocity 131 u ms-1 vvh V-velocity 132 v ms-1 qvh Specific humidity 133 q kgkg-1 sp Surface Pressure 134 sp Pa wwh W-velocity 135 w Pa s-1 sd Snow depth 141 sd m of water equivalent msl Sea level pressure 151 msl Pa tcc Total cloud cover 164 tcc (0-1) u10 10m U velocity 165 10u ms-1 v10 10m V velocity 166 10v ms-1 tt2 2m temperature 167 2t K td2 2m dew point 168 2d K lsprec Large scale precipitation 142 lsp m convprec Convective precipitation 143 cp m sshf Sensible heat flux 146 sshf Jm-2 ssr Solar radiation 176 ssr Jm-2 ewss EW surface stress 180 ewss Nm-2s nsss NS surface stress 181 nsss Nm-2s oro Orography 129 z m2s-2 excessoro Standard error orography 160 sdor ~ lsm Land-Sea mask 172 lsm (0-1)
Total of 22 parameters are retrieved.
The ParameterID is following the table nr 128.