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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| Experiment ID | Initial condition | Resolution | Starting date | Time step | Output frequency | ||
|---|---|---|---|---|---|---|---|
Xaver | 1 | gt2n | ERA-Interim | T255L91 | 1 Dec, 2 Dec, 3 Dec 2013 | 2700 s | 3h |
| 2 | gt44 | ERA_Interim | T639L137 | 1 Dec, 2 Dec, 3 Dec 2013 | 900 s | 3h | |
| 3 | gtgc | ERA-Interim | T1279L137 | 1 Dec, 2 Dec, 3 Dec 2013 | 600 s | 3h | |
| 4 | gt2r | ERA5 | T255L91 | 1 Dec, 2 Dec, 3 Dec 2013 | 2700 s | 3h | |
| 5 | gt46 | ERA5 | T639L137 | 1 Dec, 2 Dec, 3 Dec 2013 | 900 s | 3h | |
| 6 | gtgd | ERA5 | T1279L137 | 1 Dec, 2 Dec, 3 Dec 2013 | 600 s | 3h | |
| line | |||||||
Desmond | 1 | gryg | ERA-Interim | T255L91 | 1 Dec, 2 Dec, 3 Dec, 4 Dec, 5 Dec 2015 | 2700 s | 3h |
| 2 | gs22 | ERA-Interim | T639L137 | 3 Dec, 4 Dec 2015 | 900 s | 3h | |
| 3 | gs23 | ERA-Interim | T1279L137 | 1 Dec, 2 Dec, 3 Dec, 4 Dec, 5 Dec 2015 | 600 s | 3h | |
| 4 | gs0c | ERA5 | T255L91 | 3 Dec, 4 Dec 2015 | 2700 s | 3h | |
| 5 | gs04 | ERA5 | T639L137 | 3 Dec, 4 Dec 2015 | 900 s | 3h | |
!! The input data and the namelists needed to run the experiments can be downloaded from the ECMWF FTP server: download.ecmwf.int/test-data. !!
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:
File name
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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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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.
<p>The listed 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 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><b><font color=red>!!</font></b> To run the model, the paths of the input data and the namelist have to be set in the job. ..... <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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