Initialization using ERA5

[Jeremy]

Hi everyone,

How can I do using ERA-5 atmospheric and soil (soil moisture/soil temperature) for initiation using MPAS model?. Thanks


kind regards,
Jeremy

 

[mgduda]

Are the ERA5 files you are downloading in NetCDF or GRIB format? The file format will determine how you need to pre-process the files in order to get them into the "intermediate" file format required by the init_atmosphere_model program.

In my opinion, working with ERA5 files in GRIB format leads to a simpler workflow, since you can use the WPS ungrib program to convert directly from GRIB to "intermediate" format.

 

[Jeremy]

I have some questions with Vtable.

I had seen that some people use ECMWF Vtable. But, in my case I use Vtable.ERA-interim_pl

Which is correct to use ECMWF Vtable or Vtable.ERA-interim_pl?

I followed this recommendation for use Vtable.ERA-interim_pl when I use era5

WRF - Free Data



Which files static, surface, and pressure level from ERA5 recommend to initialize the model?

I will use these variables of era5 for initiliaze the model. What do you think about it?

1) Pressure level variable

- Geopotential
- Temperature
-U velocity
- V velocity
-Relative humidity

2) surface level variable

Sea surface temperature
Volumetric soil water layer 1
Volumetric soil water layer 2
Volumetric soil water layer 3
Volumetric soil water layer 1
Surface pressure
Soil temperature level 1
Mean sea level pressure
10 metre U wind component
10 metre V wind component
2 metre temperature
2 metre dewpoint temperature
Soil temperature level 2
Soil temperature level 3
Skin temperature
Soil temperature level 4


3) Static variable

Lake cover
Low vegetation cover
High vegetation cover
Soil type
Standard deviation of filtered subgrid orography
Geopotential
Standard deviation of orography
Anisotropy of sub-gridscale orography
Angle of sub-gridscale orography
Slope of sub-gridscale orography
Land-sea mask

 

[Jeremy]

I downloaded files of surface and pressure level of 2014-02-15 until 2014-02-26. Also I had downloaded the static file only one time.


Then, I am thinking of other methods more quickly. But, I don't know if it is correct.

1) In a folder I copy the era5.static.grb file (static file), the surface grib files and pressure levels grib files .

2) use link_grib.sh
./link_grib.csh *.grb

3. create the namelist.wps: change the reanalysis frequency to 1 hour. Since I do ungrib at the same time for surface and 3d, I simply use the prefix FILE. I am attaching my namelist.wps. Can you check if is correct?

4. execute ungrib.exe

./ungrib.exe > ungrib.log

If you see my explanation I use ungrib just once for process static, surface and pressure levels at the same time .


But, I saw other methodologies in the forum WRF/ MPAS, that they do the following

I have all the e5.oper.an* grib files of surface and presure level , Vtable, namelist.wps, link_grib.csh and ungrib.exe in my directory. Then I cal
l
./link_grib.csh e5.oper.an* ( link all files of surface and pressure level)
followed by
./ungrib.exe
If successful, I should have WPS intermediate file called ERA5:yyyy-mm-dd_HH in my directory

Then , I do the following:

./link_grib.csh e5.oper.invariant*
followed by
./ungrib.exe
If successful, I should have a WPS intermediate file called ERA5_INVARIANT:1979-01-01_00 in my directory.

Combine time-variant and time-invariant fields: This can be done by:
cat ERA5_INVARIANT\:1979-01-01_00 >> ERA5\:yyyy-mm-dd_HH

After , I should have a WPS intermediate file called ERA5:yyyy-mm-dd_HH in my directory which has both time-invariant and time-variant records. This file I can then use to initialize MPAS

I am very confused with the methodologies . Can you help me with it?. Thanks