Running WPS with ERA5 input

koko_a

New member
Hi,
I'm using WRF 3.9.1.1 (I guess the WPS version is 3.9).
I'm used to running WPS (and WRF) with ERA-Interim in model levels as input.

Recently, I tried to run it with ERA5 as input and downloaded the ERA5 files on pressure levels (and surface data) from the NCAR's RDA (https://rda.ucar.edu/datasets/ds633.0/#!access).
I used the supplied Vtable for ERA-Interim on pressure levels, and completed ungrib and metgrid, but couldn't complete real.exe.
It seems to me I have a problem with the metgrid run, since the met_em files I get have many of the fields (e.g., TT) as 2D vars, instead of 3D.

I'm not sure if I get this problem because I moved to using a different dataset (ERA5 instead of ERA-Interim) or because I'm now using pressure level instead of model level fields.

Can you please help me to figure what's wrong?
Thanks,
Koko

(Attached are the namelist.wps and the Vtable I'm using)
 

Attachments

  • namelist_ERA5.wps
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  • Vtable.ERA-interim.pl.txt
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Ming Chen

Moderator
Staff member
Please use Vtable.ECMWF to ungrib ERA5 data. Then try again. Let me know if you still have issues.
ERA5 is relatively new and variables are saved in different files. Please make sure you download all required files.
 
Ming Chen said:
Please use Vtable.ECMWF to ungrib ERA5 data. Then try again. Let me know if you still have issues.
ERA5 is relatively new and variables are saved in different files. Please make sure you download all required files.

Dear Ming Chen,

I used Vtable.ERA-interim_pl to ungrib the ERA5 data following this link: https://www2.mmm.ucar.edu/wrf/users/download/free_data.html and I did not face any problem. Do I still need to change it to Vtable.ECMWF?
 

deva_wrf

New member
koko_a said:
Hi,
I'm using WRF 3.9.1.1 (I guess the WPS version is 3.9).
I'm used to running WPS (and WRF) with ERA-Interim in model levels as input.

Recently, I tried to run it with ERA5 as input and downloaded the ERA5 files on pressure levels (and surface data) from the NCAR's RDA (https://rda.ucar.edu/datasets/ds633.0/#!access).
I used the supplied Vtable for ERA-Interim on pressure levels, and completed ungrib and metgrid, but couldn't complete real.exe.
It seems to me I have a problem with the metgrid run, since the met_em files I get have many of the fields (e.g., TT) as 2D vars, instead of 3D.

I'm not sure if I get this problem because I moved to using a different dataset (ERA5 instead of ERA-Interim) or because I'm now using pressure level instead of model level fields.

Can you please help me to figure what's wrong?
Thanks,
Koko

(Attached are the namelist.wps and the Vtable I'm using)

Dear sir,
As i read your problem, i am facing the same problem too
we have two different type of data set
1 ERA5 atmospheric pressure level analysis
2 ERA5 atmospheric surface analysis
we have 2 separate file then how we can link it.
 
As we need both to run simulation with ERA5 data, (1 ERA5 atmospheric pressure level analysis, 2 ERA5 atmospheric surface analysis),
I downloaded both of these data into a same folder and linked them in my WPS folder with this line:
./link_grib.csh /"your folder path"/e5.*
 

deva_wrf

New member
there are certain type of data set
e5.oper.an.pl.128_132_v.ll025uv.2015082400_2015082423.grb
e5.oper.an.pl.128_060_pv.ll025sc.2015120100_2015120123.grb
e5.oper.an.pl.128_075_crwc.ll025sc.2015120100_2015120123.grb

which data set we have to download and what are the difference between them
 
deva_wrf said:
there are certain type of data set
e5.oper.an.pl.128_132_v.ll025uv.2015082400_2015082423.grb
e5.oper.an.pl.128_060_pv.ll025sc.2015120100_2015120123.grb
e5.oper.an.pl.128_075_crwc.ll025sc.2015120100_2015120123.grb

which data set we have to download and what are the difference between them

You need both pressure and surface data. You can download them from the following links by opening a account. There will be several files for each of them for a particular time period.

CISL RDA: ERA5 Reanalysis (0.25 Degree Latitude-Longitude Grid) (For pressure level data)
https://rda.ucar.edu/datasets/ds633.0/index.html#sfol-wl-/data/ds633.0?g=6

CISL RDA: ERA5 Reanalysis (0.25 Degree Latitude-Longitude Grid) (ucar.edu) (For surface data)
https://rda.ucar.edu/datasets/ds633.0/index.html#sfol-wl-/data/ds633.0?g=9
 

deva_wrf

New member
sadya_islam20 said:
deva_wrf said:
there are certain type of data set
e5.oper.an.pl.128_132_v.ll025uv.2015082400_2015082423.grb
e5.oper.an.pl.128_060_pv.ll025sc.2015120100_2015120123.grb
e5.oper.an.pl.128_075_crwc.ll025sc.2015120100_2015120123.grb

which data set we have to download and what are the difference between them

You need both pressure and surface data. You can download them from the following links by opening a account. There will be several files for each of them for a particular time period.

CISL RDA: ERA5 Reanalysis (0.25 Degree Latitude-Longitude Grid) (For pressure level data)
https://rda.ucar.edu/datasets/ds633.0/index.html#sfol-wl-/data/ds633.0?g=6

CISL RDA: ERA5 Reanalysis (0.25 Degree Latitude-Longitude Grid) (ucar.edu) (For surface data)
https://rda.ucar.edu/datasets/ds633.0/index.html#sfol-wl-/data/ds633.0?g=9


Thankyou very much your reply sir.

Sir i need to know how we can differentiate the files between them for the same time period.

can you suggest me some data names
 
So the pressure level data would have .pl in them: e5.oper.an.pl.128_060_pv.ll025sc.1979010100_1979010123.grb
and the surface level data would have .sfc in them: e5.oper.an.sfc.128_015_aluvp.ll025sc.1979010100_1979013123.grb

Is that what you wanted to know?

When you log in to the website, you can find pressure and surface data (see image) and go to each link by clicking "web file listing" -> "faceted browse".
 

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deva_wrf

New member
thank you very much, for your concern

i need to know the diffrence between 060_pv means and 075_crwc

e5.oper.an.pl.128_060_pv.ll025sc.2015033100_2015033123.grb
e5.oper.an.pl.128_075_crwc.ll025sc.2015040100_2015040123.grb
 

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These are the variable names, for example "vo" stands for vorticity, "crwc" meaning Specific rain water content etc. You can check the documentation for more details: https://confluence.ecmwf.int/display/CKB/ERA5%3A+data+documentation
 

deva_wrf

New member
sadya_islam20 said:
These are the variable names, for example "vo" stands for vorticity, "crwc" meaning Specific rain water content etc. You can check the documentation for more details: https://confluence.ecmwf.int/display/CKB/ERA5%3A+data+documentation

dear sir,
Earlier i used to download fnl data for my simulations, in which we have to download files for each time step, one file contains all the variables required for the simulations.
but now i need to simulate with era 5, so i am not sure about the data set required for the simulations,

so as per your suggestions we have to download all the variables form that directory .
 
Yes, you need to download all the files that are created after selecting a desired time period for both pressure and surface level data. For example (see attached pic), for only this date (2018-10-01), there are 16 pressure level data and 62 surface level data. You need to download all of them.

However, this is how I learned to use ERA5 data. There could be different ways.

Also, please stop saying SIR :roll:
 

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deva_wrf

New member
sadya_islam20 said:
Yes, you need to download all the files that are created after selecting a desired time period for both pressure and surface level data. For example (see attached pic), for only this date (2018-10-01), there are 16 pressure level data and 62 surface level data. You need to download all of them.

However, this is how I learned to use ERA5 data. There could be different ways.

Also, please stop saying SIR :roll:

Hey, i got the different interface to download data, i am sending yo the interface i found and i am very much confuse about data set type every single data set contain a size of 1.5GB
 

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Ming Chen

Moderator
Staff member
This is the webpage that describe in detail the ERA5 data:
https://rda.ucar.edu/datasets/ds630.0/#metadata/detailed.html?_do=y
https://rda.ucar.edu/datasets/ds630.0/#!description
 
deva_wrf said:
sadya_islam20 said:
See the attachment. Hope this will help to download the data.

these data provide a boundary condition in every hour ?



ERA5 data is hourly, so my guess would be yes to your question. But, I would suggest you to look into more information on that.
 
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