I pretend to use the PREP-CHEM source emissions to investigate PM2.5 concentration in Brazil with WRF-Chem.
One of my questions is about which chemical mechanism (chem_opt) I need to use in the namelist.input.
The PREP-CHEM is compiled for RADM_WRF_FIM_SIMPLE. The manual recommends to use:
kemit = 1
io_style_emissions = 2
emiss_inpt_opt = 1 (RADM2/SORGAN)
emiss_opt = 5 (GOCART RACM_KPP)
biomass_burn_opt = 1 plumerisefire_frq = 120
But what about the chem_opt? The simulation works fine with RADM2 Chemistry and GOCART aerosols (chem_opt = 303), but as my intention is to investigate PM2.5, the secondary aerosol is important to consider.
Therefore, which options should I use in &chem?
Secondary Organic Aerosol is a product of the oxidation of volatile organic compounds. Despite the fact that the process is not completely understood there are many attempts of parameterization. In the framework of the WRF-chem model the formation process of the SOA is represented by a SORGAM module. It should work with the RADM2 mechanism.
One of the examples of a recent simulation is reported in the paper:
Regional modeling of secondary organic aerosol over China using WRF/Chem
https://www.sciencedirect.com/science/article/pii/S0021850211001595
For the description of SORGAM please see for example:
https://ruc.noaa.gov/wrf/wrf-chem/made_sorgam.htm
hello everyone !
as i am running the convert_emiss.exe to provide volcanic ash. i have met the error. which means the namelist.input has got some errors. would anyone help to correct the namelist.input ? thanks
First, you can use chem_option = 11
(RADM2 chemical mechanism and MADE/SORGAM aerosols including some aqueous reactions)
Using the prep_chem_sources_RADM_WRF_FIM_.exe (e.g with EDGAR-HTTP data set) will produce an emission file which WRF-Chem can use with emiss_opt = 2 (or 5) and emiss_inpt_opt = 1
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