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Conducted OpenIFS experiments

Several experiments have been conducted with OpenIFS for both cases with the aim to test the effect of starting date and forecast length, initial condition as well as spatial resolution to the forecast quality. Details of the experiments are summarized in Table 1.


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Table 1: Settings of the experiments achieved for Storm Xaver and Storm Desmond.



Experiment IDInitial conditionResolutionStarting dateTime stepOutput frequency
Xaver
1gt2nERA-InterimT255L911 Dec, 2 Dec, 3 Dec 20132700 s3h
2gt44ERA_InterimT639L1371 Dec, 2 Dec, 3 Dec 2013900 s3h
3gtgcERA-InterimT1279L1371 Dec, 2 Dec, 3 Dec 2013600 s3h
4gt2rERA5T255L911 Dec, 2 Dec, 3 Dec 20132700 s3h
5gt46ERA5T639L1371 Dec, 2 Dec, 3 Dec 2013900 s3h
6gtgdERA5T1279L1371 Dec, 2 Dec, 3 Dec 2013600 s3h
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Desmond
1grygERA-InterimT255L91

1 Dec, 2 Dec, 3 Dec, 4 Dec, 5 Dec 2015

2700 s3h
2gs22ERA-InterimT639L137

3 Dec, 4 Dec 2015

900 s3h
3gs23ERA-InterimT1279L137

1 Dec, 2 Dec, 3 Dec, 4 Dec, 5 Dec 2015

600 s3h
4gs0cERA5T255L91

3 Dec, 4 Dec 2015

2700 s3h
5gs04ERA5T639L137

3 Dec, 4 Dec 2015

900 s3h

Downloading the input data

!! The input data and the namelists needed to run the experiments can be downloaded from the ECMWF FTP server. For further instructions, please visit the following website: download.ecmwf.int/test-data/openifs. !!

The files are packed in .tar.gz files and structured into directories named after the case studies (i.e., Xaver_201312, Desmond_201512) and subdirectories indicating the main experiment characteristics (e.g., T255L91_ERA5). Each archive file contains the data for a given starting date (e.g., gs0c_2015120300.tar.gz). Typical content of a .tar.gz file is as follows:

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File name                                       Description                                                                                                                                                                                   Size

2015120300/                               : directory for a given starting date                                                                0 MB
2015120300/ecmwf/                         : subdirectory containing the namelists and some outputs                                             0 MB
2015120300/ecmwf/namelistfc               : namelist with detailed experiment setup                                                          4.6 KB
2015120300/ecmwf/NODE.001_01.model.1      : text output (log) file including all the important information about the model run               3.8 MB
2015120300/ecmwf/ifs.stat.model.1         : information about model steps (useful for debugging)                                              26 KB
2015120300/ecmwf/wam_namelist             : namelist of the coupled wave model                                                               3.1 KB
2015120300/ICMCLgs0cINIT                  : input file containing surface and soil information (albedo, soil temperature etc.)               9.3 MB
2015120300/ICMGGgs0cINIT                  : input file containing gridpoint surface initial data                                               7 MB
2015120300/ICMSHgs0cINIT                  : input file containing initial data for the prognostic variables in spectral representation        35 MB
2015120300/ICMGGgs0cINIUA                 : input file containing initial data for the prognostic variables in gridpoint representation      101 MB
2015120300/wam_grid_tables                : model grid and tables for the wave model                                                          52 MB
2015120300/wam_subgrid_0                  : information for model advection, including sub-grid parametrisation for the wave model            12 MB
2015120300/wam_subgrid_1                  : information for model advection, including sub-grid parametrisation for the wave model            25 MB
2015120300/wam_subgrid_2                  : information for model advection, including sub-grid parametrisation for the wave model            25 MB
2015120300/cdwavein                       : initial value of drag coefficient for the wave model                                              63 KB
2015120300/specwavein                     : initial wave spectra for the wave model                                                          7.6 MB
2015120300/uwavein                        : initial value of wind speed for the wave model                                                    63 KB
2015120300/sfcwindin                      : initial value of 10-meter horizontal wind components and sea ice fraction for the wave model     2.2 MB

The namelist

The namelist file highlighted in green in the box above controls the necessary settings (e.g., time step, experiment ID) as well as the post-processing. The most important namelist elements are listed below with their explanation:

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&NAMDYN                  ! Name of the namelist group
TSTEP=2700.0,            ! Timestep in seconds
/                        ! End of the namelist group

&NAMFPG
NFPLEV=91,               ! Number of vertical levels
NFPMAX=255,              ! Spectral truncation
/

&NAMCT0
CNMEXP="gs0c",           ! Experiment ID
/

&NAMFPC
! Pressure level outputs: number of fields (NFP3DFP), GRIB field codes (MFP3DFP) and pressure levels in Pascals (RFP3P)
NFP3DFP=9,
MFP3DFP(:)=129,130,135,138,155,157,133,131,132,
RFP3P(:)=100000.0,92500.0,85000.0,70000.0,50000.0,40000.0,30000.0,25000.0,20000.0,\
         15000.0,10000.0,7000.0,5000.0,3000.0,2000.0,1000.0,700.0,500.0,300.0,200.0,100.0,

! Saving spectral orography (geopotential), surface pressure (logarithm of surface pressure) needed to post-processing
NFP2DF=2,
MFP2DF(:)=129,152,
! Physics output: number of fields (NFPPHY) and GRIB field codes (MFPPHY)

NFPPHY=89,
MFPPHY(:)=31,32,33,34,35,36,37,38,39,40,41,42,44,45,49,50,57,58,59,78,79,129,136,\
          137,139,141,142,143,144,145,146,147,148,151,159,164,165,166,167,168,169,\
          170,172,175,176,177,178,179,180,181,182,183,186,187,188,189,195,196,197,\
          198,201,202,205,206,208,209,210,211,235,236,238,243,244,245,229,230,231,\
          232,213,212,8,9,228089,228090,228001,260121,260123,228129,228130,
/

In the evaluation, we would like to investigate the following variables:

  • 2-meter temperature: its GRIB code number is 167;
  • precipitation: it is composed from large-scale and convective precipitation with code numbers 142 and 143, respectively;
  • mean sea level pressure: its code number is 151;
  • 10-meter wind gust: its code number is 49;
  • temperature at 850 hPa level: its code number is 130;
  • relative humidity at 700 hPa level: its code number is 157;
  • geopotential at 500 hPa level: its code number is 129;
  • u and v wind components at 250 and 100 hPa with code numbers 131 and 132, respectively.

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<p>These variables have to be included in the namelist among the post-processing variables (see the code numbers and levels highlighted with <b>bold</b> characters in the box above). More information about the namelist settings and GRIB field codes of different parameters can be found in the <b><a href="https://software.ecmwf.int/wiki/display/OIFS/How-to+articles" target="_blank">OpenIFS how-to articles</a></b>: <a href="https://software.ecmwf.int/wiki/display/OIFS/How+to+control+OpenIFS+output" target="_blank">How to control OpenIFS output</a>.</p>
<p>To run the model, the paths of the input data and the namelist have to be set in the job script. A sample job script is part of the <a href="https://software.ecmwf.int/wiki/display/OIFS/5.4+Download+OpenIFS" target="_blank">OpenIFS starter kit</a> and the model execution is introducedexplained within detailed explanationdetail at the <strong><a href="https://software.ecmwf.int/wiki/display/OIFS/5.+OpenIFS+Installation" target="_blank">OpenIFS installation page</a></strong>: <a href="https://software.ecmwf.int/wiki/display/OIFS/5.6+Acceptance+testing+OpenIFS+after+installation" target="_blank">Acceptance testing OpenIFS after installation</a>.</p>


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