Thomson aerosol aware mp=28 and real data for aerosols

[alainF]

Hello,
It is not clear to me what kind of files I need to process into metgrid for real time aerosol (GEOS-5 product) into WRF with mp = 28.
Suppose that I want to run a forecast starting at 00Z for the 26th of June and a forecast length equal to 168 h.
I suspect that the aerosol file is somewhere here : GEOS-FP: Weather Analyses and Forecasts
On the portal, there are 2 buttons "Assimilation" and "Forecast". Which one is the right one ?
What is the filename syntax and how many files do I need to download : only 1 file at 00Z or several files at different times ?

Thanks a lot for any help,

Alain

 

[kwerner]

Alain,
Take a look at this page that provides a description of this scheme, and how to run it.

 

[Ming Chen]

Alain,
You can obtain the data from QNWFA_QNIFA_QNBCA_SIGMA_MONTHLY.dat
and run WPSv4.4 and WRFv4.4.
I don't think you should download real-time data from GOES website. This is not the way the Thompson scheme is supposed to work.

 

[zzann]

I am sorry for the necroposting. It appears that there are no capabilities for using real-time GEOS aerosols with the Thompson scheme. But in this case I find the WRF version description a bit misleading. Isn't it?

Release WRF Version 4.4 · wrf-model/WRF

The WRF Model has been updated to Version 4.4 on April 26, 2022. The WRF Pre-processing System (WPS) has been updated to Version 4.4. Acknowledgements: We would like to thank Do Ngoc Khanh (Tokyo ...

github.com

Support is also added for ingesting real-time data that contains these aerosols (such as from GEOS-5) by setting use_rap_aero_icbc = .true. (Details).

 

[zzann]

actually there is something mentioned on aerosol processing with metgrid, but I can't find if it's detalied elsewhere:

Removing legacy code and cleaning up logic for real processing of aer… · wrf-model/WRF@61a1359

…osol for mp_physics=28 (#1567) TYPE: enhancement KEYWORDS: real, Thompson aerosol-aware, microphysics SOURCE: Timothy W. Juliano and Pedro A. Jimenez (NCAR/RAL) DESCRIPTION OF CHANGES: ...

github.com

5. For the 3D aerosol processing, here is the new workflow. When the user selects use_aero_icbc=.true. (i.e., aer_init_opt=1) for climatology aerosol forcing, we interpolate the aerosol fields to the WRF grid pressure levels as before. No changes have been made to the interpolation routine for use_aero_icbc. However, when the user selects use_rap_aero_icbc=.true. (i.e., aer_init_opt=2) for first guess aerosol forcing, we allow for two possibilities: * the user has pre-processed the first guess aerosol such that they are located at the native pressure levels of the host model. In this case, the user will process pressure variable p_wif during metgrid, and flag_p_wif=1, as defined in the modified METGTRID.TBL file, will be written to the met_em files. In dyn_em/module_initialize_real, we check for flag_p_wif=1 and subsequently interpolate the aerosol fields to the WRF grid pressure levels. At this stage, we do not have a way to check to ensure that the user-defined num_wif_levels in the namelist is equal to num_wif_levels written to the met_em files. For now, the best we can do is write a comment to the rsl.out files. * the user has pre-processed the first guess aerosol such that they are interpolated to the ungrib pressure levels. In this case, the user will set num_wif_levels in the namelist equal to num_metgrid_levels; otherwise, a fatal error will occur.