Regarding registry.chem and the formation of PM2.5 using MOZCART

[vaishnavi vaishnavi]

Hey everybody,

I am having trouble with how final PM2.5 concentration are generated using MOZCART. Please help me understand.

I wanted to check the required emissions for MOZCART and checked the registry.chem and saw this

# Anthropogenic emissions
state real e_pm_25 i+jf emis_ant 1 Z i5r "E_PM_25" "EMISSIONS" "ug/m3 m/s"
state real e_pm_10 i+jf emis_ant 1 Z i5r "E_PM_10" "EMISSIONS" "ug/m3 m/s"
...
..
# Additional MOZCART emission variables...
# additional arrays for mozcart biomass burning
# Input for GOCART: Background chemistry, erodible surface emissions map


i) What does "i +jf", "1", "Z", "i5r" mean here?

ii) I am using MOZCART (MOZART and GOCART) and EDGAR-HTAP for anthropogenic emissions. For biomass burning I use FINN fire emission and MEGAN for biogenic emissions

Under # GOCART in registry.chem it says,

# GOCART
state real e_bc i+jf emis_ant 1 Z i5 "E_BC" "EMISSIONS BC AER" "ug/m3 m/s"
state real e_oc i+jf emis_ant 1 Z i5 "E_OC" "EMISSIONS BC AER" "ug/m3 m/s"
state real e_sulf i+jf emis_ant 1 Z i5 "E_sulf" "EMISSIONS SO4" "mol km^-2 hr^-1"

I have seen in EDGAR -HTAP that there are BC, OC , PM2.5 and PM10 emissions available. And PM2.5 = BC +OC+SS+DU+nitates and sulphates.

GOCART uses BC,OC from EDGAR-HTAP and under # Anthropogenic emissions in registry.chem there are PM2.5 and PM10.

So does it mean that BC and OC of EDGAR-HTAP (through wrfchemi files) are taken to calculate the final PM2.5 concentration (DU and SS are calculated online), if I choose MOZCART ? and PM2.5 and PM10 emissions from EDGAR-HTAP are ignored automatically?

Or will PM2.5 from EDGAR-HTAP be taken and on top of that (because I use MOZCART) would BC and OC from EDGAR-HTAP additionally be added to the final PM2.5 concentration and eventually overestimate PM2.5?

iii) I saw the following in registry.chem, I didnt understand it, what does it mean? Do I need these Inputs as separate files?

# Input for GOCART: Background chemistry, erodible surface emissions map

state real backg_oh ikj misc 1 - i08r "BACKG_OH" "Background OH for Aerosol-GOcart option" "volume mixing ratio"
state real backg_h2o2 ikj misc 1 - i08r "BACKG_H2O2" "Background H2O2 for Aerosol-GOcart option" "volume mixing ratio"
state real backg_no3 ikj misc 1 - i08r "BACKG_NO3" "Background NO3 for Aerosol-GOcart option" "volume mixing ratio"


iv) I saw that ISOPRENE is in both # Anthropogenic emissions and in # # Additional MOZART emission variables. Does WRF know not to calculate ISOPRENE twice if the user chooses MOZART?

# Anthropogenic emissions
#
state real - i+jf emis_ant - - - - "Anthropogenic Emissions" ""
state real e_iso i+jf emis_ant 1 Z i5r "E_ISO" "Isoprene EMISSIONS (Anth. for RADM/RACM, Anth+Bio for CBMZ)" "mol km^-2 hr^-1"
state real e_so2 i+jf emis_ant 1 Z i5r "E_SO2" "EMISSIONS" "mol km^-2 hr^-1"

# Additional MOZART emission variables...

state real e_xylene i+jf emis_ant 1 Z i5 "E_XYLENE" "EMISSIONS XYLENE" "mol km^-2 hr^-1"
state real e_isop i+jf emis_ant 1 Z i5 "E_ISOP" "EMISSIONS ISOP" "mol km^-2 hr^-1"


Thank you