Large aerosol emissions in Finn v2.5

[Juan jose Henao]

Hello, 

I am currently running a simulation with fire emissions from FINN 2.5 modis + viirs using the fire_emiss preprocessor. 

For the aerosol mapping I used the following:

'oc -> OC;aerosol',
'bc -> BC;aerosol',
'pm25 -> PM25 + -1.0*BC + -1.0*OC;aerosol',
'pm10 -> PM10 + -1.0*PM25;aerosol'

The season was February and April 2016, which was very active in Northern South America. However there are emissions of pm25 and OC of over 60 or 80 ug/m2/s in some fires. These results in large emissions and very large concentrations at the emitting grid cells.

I also saw that in the example .inp file for wrf using v1.5 only BC and OC are included, and pm2.5 and pm10 are not considered. Is there a specific reason for this?

The next figure shows the pm25 concentration in ug/m3 for a simulation without (Base) and with finn emissions (Fire). Have anyone encountered such a large emissions in Finn v2.5??

Thank you

[Gabriele Pfister]

Hi Juan

have you compared your modeled concentrations to measurements? For intense fires I don't think the emission values you mention are out of range. 

Gabi

--

================================
Gabriele Pfister, Deputy Director

Atmospheric Chemistry Observations & Modeling

National Center for Atmospheric Research (NCAR)

Email: pfi...@ucar.edu

Temporary Home Office Phone: +1 303 241 1329

Work Phone: +1 303 497 2915

Web: https://staff.ucar.edu/users/pfister

[Juan jose Henao]

Thanks Gabi for your reply,

I have not compared with surface stations yet because the available stations are far away from the fires. However the resulting concentrations are huge.. I think it was not clear in the previous figure due to the range of values plotted, but PM25 concentrations in the fire locations are over 90,000 ug/m3 and Its definitely due the fire emissions