Are there prescribed aerosols in WRF?

Z

zeynep.altay

New member
Hello,

I am wondering if there are prescribed aerosols value in WRF model (not WRF-Chem, WRF-Solar or WRF-ACI). If yes, where I could find those species & values, and is there an option that i can run the model without aerosols?
When I use mp_physics_opt = 8, and RRTMG scheme for radiation, is there any aerosol impact? Or is it a clear-sky situation?

I am asking these questions because I implemented aerosol data into the model, and I need a control run (test run) where there is no aerosol impact so that i can compare the temperature and precipitation outputs.

Thank you for your help!

Zeynep
 
RRTMG radiation scheme considers aerosol radiative impacts. The namelist option, aer_opt, determines how aerosols are described in the model.

aer_opt =1 use Tegen (1997) data,
= 2 use J. A. Ruiz-Arias method
= 3 use G. Thompson's water/ice friendly climatological aerosol

Details can be found in the code phys/module_ra_rrtmg_sw.F and phys/module_physics_init.F

The Thompson microphysics scheme (mp_physics =8) doesn't include aerosol information.

Aerosol implementation in radiation and microphysics is a complicated issue. You may get some idea from the aerosol-aware microphysics scheme (mp_physics = 28)

Hope this is helpful for you.
 
Thank you so much for your explanations!

As far as i understood, even if I don't specify the aer_opt, the aerosol impact is considered in the calculations. Is this correct?
In order to observe the aerosol impact on temperature, I need a control run that does not consider the aerosol impact at all. Is there a way to achieve this?

Thank you so much for making clear that the Thompson microphysics scheme (mp_physics =8) doesn't include aerosol information.

I am looking forward for your comments. Thank you very much.

Kind regards,
Zeynep
 
If you don't specify the option of aer_opt, its default option is 0, indicating no aerosol effect is considered.
 
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