icon-eu download data
- Thread starter dominic
- Start date
Thank you very much for your precious answer Ming Chen, I only have one problem, I notice that in other scripts, for example the one in the github discussion for icon integration, cdo is used with additional files downloadable from dwd for the regrid. This is because in icon there are problems with the levels if I understand correctly. In the script in question I don't see this string.
Thanks so much for further suggestions
Pugazenthi
New member
Hi dominic!!
Actually cdo used with the dwd regrid files are generally for re-griding Icosachedral triangular grids to regular lat-lon grid which is preferred by WRF.
In the Chen mentioned script its already downloading Lat-lon grid attribute file only and if you are interested in European region, you probably don't need this regriding process.
You can directly incorporate the downloaded and merged files for WRF initialization.
Note that, Regridding is done, according to your input datasets.
Actually cdo used with the dwd regrid files are generally for re-griding Icosachedral triangular grids to regular lat-lon grid which is preferred by WRF.
In the Chen mentioned script its already downloading Lat-lon grid attribute file only and if you are interested in European region, you probably don't need this regriding process.
You can directly incorporate the downloaded and merged files for WRF initialization.
Note that, Regridding is done, according to your input datasets.
julianrvogel
New member
Hello everyone,
I am currently testing to run WRF V4.6.1 using ICON data as input. I have tested only the European model ICON-EU so far. After a few struggles, it works for me. However, I found a few things that seem strange to me using this download script.
First of all, there is a newer version of the download script from Michael Graf on Github that acknowledges that the European model forecasts 1-hourly data only for up to 30 hours (in the newer script the forecast hours fff reach until 24 instead of 72). But the script still downloads only the model levels from 1 to 60, while there are actually 74 model levels. It may be the case that an older ICON-EU model had fewer levels or maybe there was another reason for this? As far as I can see, if we download only levels 1 to 60, the atmospheric data between 20 m (level 74) and ~ 1.9 km (level 60) is missing. The data is probably still sufficient so that WPS/WRF wouldn't complain and just interpolate everything in between, but this seems not ideal.
Finally, the soil level 0 temperature is not used by the VTable, so I removed it from the download. However, there are 2 more soil levels in the Vtable that we actually need to download.
I am attaching my corrected version of the download script. Hopefully, it may be of use to others and maybe someone else here can confirm my modifications.
Thanks a lot to the contributors who implemented the ICON support! Very useful
I am currently testing to run WRF V4.6.1 using ICON data as input. I have tested only the European model ICON-EU so far. After a few struggles, it works for me. However, I found a few things that seem strange to me using this download script.
First of all, there is a newer version of the download script from Michael Graf on Github that acknowledges that the European model forecasts 1-hourly data only for up to 30 hours (in the newer script the forecast hours fff reach until 24 instead of 72). But the script still downloads only the model levels from 1 to 60, while there are actually 74 model levels. It may be the case that an older ICON-EU model had fewer levels or maybe there was another reason for this? As far as I can see, if we download only levels 1 to 60, the atmospheric data between 20 m (level 74) and ~ 1.9 km (level 60) is missing. The data is probably still sufficient so that WPS/WRF wouldn't complain and just interpolate everything in between, but this seems not ideal.
Finally, the soil level 0 temperature is not used by the VTable, so I removed it from the download. However, there are 2 more soil levels in the Vtable that we actually need to download.
I am attaching my corrected version of the download script. Hopefully, it may be of use to others and maybe someone else here can confirm my modifications.
Thanks a lot to the contributors who implemented the ICON support! Very useful
master1986
New member
Hi replying to this thread after a long time but now I'm working on wrf with icon data. Thank you very much! it was a clarification that I was looking for, in my case it works even without using the regrid, in fact using the script I can download the data.
However I got this error:
in prepmetgrid2.log - error: the required field skintemp was not found in any input data.
master1986
New member
Hello everyone,
I am currently testing to run WRF V4.6.1 using ICON data as input. I have tested only the European model ICON-EU so far. After a few struggles, it works for me. However, I found a few things that seem strange to me using this download script.
First of all, there is a newer version of the download script from Michael Graf on Github that acknowledges that the European model forecasts 1-hourly data only for up to 30 hours (in the newer script the forecast hours fff reach until 24 instead of 72). But the script still downloads only the model levels from 1 to 60, while there are actually 74 model levels. It may be the case that an older ICON-EU model had fewer levels or maybe there was another reason for this? As far as I can see, if we download only levels 1 to 60, the atmospheric data between 20 m (level 74) and ~ 1.9 km (level 60) is missing. The data is probably still sufficient so that WPS/WRF wouldn't complain and just interpolate everything in between, but this seems not ideal.
Finally, the soil level 0 temperature is not used by the VTable, so I removed it from the download. However, there are 2 more soil levels in the Vtable that we actually need to download.
I am attaching my corrected version of the download script. Hopefully, it may be of use to others and maybe someone else here can confirm my modifications.
Thanks a lot to the contributors who implemented the ICON support! Very useful
Thank you so much for the script! I confirm that it works and I can run wrf without problems. The only flaw is that now the files weigh even more, if before they were just over 500mb now they weigh more than 800mb, but if there is more data for the model, welcome!
Could you also kindly post the vtable that you use on the base in your configuration? Also at how many levels of analysis did you set the namelist to get something decent? Thank you so much!
William.Hatheway
Active member
Hello everyone,
I am currently testing to run WRF V4.6.1 using ICON data as input. I have tested only the European model ICON-EU so far. After a few struggles, it works for me. However, I found a few things that seem strange to me using this download script.
First of all, there is a newer version of the download script from Michael Graf on Github that acknowledges that the European model forecasts 1-hourly data only for up to 30 hours (in the newer script the forecast hours fff reach until 24 instead of 72). But the script still downloads only the model levels from 1 to 60, while there are actually 74 model levels. It may be the case that an older ICON-EU model had fewer levels or maybe there was another reason for this? As far as I can see, if we download only levels 1 to 60, the atmospheric data between 20 m (level 74) and ~ 1.9 km (level 60) is missing. The data is probably still sufficient so that WPS/WRF wouldn't complain and just interpolate everything in between, but this seems not ideal.
Finally, the soil level 0 temperature is not used by the VTable, so I removed it from the download. However, there are 2 more soil levels in the Vtable that we actually need to download.
I am attaching my corrected version of the download script. Hopefully, it may be of use to others and maybe someone else here can confirm my modifications.
Thanks a lot to the contributors who implemented the ICON support! Very useful
might be these
WPS/ungrib/Variable_Tables/Vtable.ICONm at master · wrf-model/WPS
The official repository for the WRF Preprocessing System (WPS) - wrf-model/WPS
github.com
WPS/ungrib/Variable_Tables/Vtable.ICONp at master · wrf-model/WPS
The official repository for the WRF Preprocessing System (WPS) - wrf-model/WPS
github.com
master1986
New member
Yes there are 3 tables, but I would like to know which is the best one to use. thanks for the answer
William.Hatheway
Active member
I think it is both, kinda like how ECMWF and ERA5 have single level files and pressure level files. At least based on what I can tell. I haven't ever used ICON before but that's how it reads to me.
master1986
New member
thanks for the reply. I'll try a bit with all of them and see the differences.
I take this opportunity to ask you a question, does ecmwf 25km work with wrf? without a side dish
William.Hatheway
Active member
right now ecmwf, as far as I know at the moment, has issues due to their recent changes in how they code soil data.
This post explains the issue at the moment:
Change in soil variables from ECMWF Cycle 49r1
@Ming Chen I downloaded the modified rd_grib2.F file, recompiled my WPS, and tested it with the operational ECMWF IFS 0.25º data using your Vtable.ERA5 and it didn't work. The soil temperature and moisture data still aren't being read. Maybe these contributions work for the ERA5 data, but for...
forum.mmm.ucar.edu
But ERA5 data for reanalysis data can work but you need to do the ungrib in two parts, single and model levels and then use metgrid to merge them.
master1986
New member
Thanks a lot for the clarification, I would need a script to download the ecmwf data for wrf, has any forum user created it?