What version of the code are you using?
CESM v2.1.5
Have you made any changes to files in the source tree?
xml files updated for porting to lab workstation
Describe every step you took leading up to the problem:
I have run a case f19_f19_mg17.FW2000climo and would like to create a new aerosol emissions file. I would like to create a dust emission in Aitken mode between 60 and 80 km altitude. To do this, I have attempted to modify the the aircraft emissions files from /atm/cam/chem/emis/CMIP6_emissions_2000climo to provide an additional emission. I have changed the 25 altitude and 26 altitude_int levels (in km) to a uniform distribution between 60 and 80 km. I have then replaced all matrix values with a uniform emission of around 1.5 molecules/cm3/s.
Describe your problem or question:
It is my understanding that emissions must be inputted both as molecular emissions and particular emissions. In the aircraft emissions files, the units were:
emiss_aircraft:units = "molecules/cm3/s"
num_bc_a4_aircraft:units = "(particles/cm2/s)(molecules/mole)(g/kg)"
I understand the conversion between molecules and particles includes using the diameter of Aitken mode particles and the (molecules/mole)(g/kg) factor is just an idiosyncrasy of CESM. However, I am confused as to how I am to convert between cm2 and cm3. My understanding is that cm2 should be for surface emissions, not vertical emissions but somehow the molecular emission must be converted to a particular emission with a different emission.
I am quite confused and would really appreciate any help that could be provided!
Files used:
/atm/cam/chem/emis/CMIP6_emissions_2000climo/emissions-cmip6_bc_a4_aircraft_vertical_2000climo_0.9x1.25_c20170322.nc
/atm/cam/chem/emis/CMIP6_emissions_2000climo/emissions-cmip6_num_bc_a4_aircraft_vertical_2000climo_0.9x1.25_c20170322.nc
CESM v2.1.5
Have you made any changes to files in the source tree?
xml files updated for porting to lab workstation
Describe every step you took leading up to the problem:
I have run a case f19_f19_mg17.FW2000climo and would like to create a new aerosol emissions file. I would like to create a dust emission in Aitken mode between 60 and 80 km altitude. To do this, I have attempted to modify the the aircraft emissions files from /atm/cam/chem/emis/CMIP6_emissions_2000climo to provide an additional emission. I have changed the 25 altitude and 26 altitude_int levels (in km) to a uniform distribution between 60 and 80 km. I have then replaced all matrix values with a uniform emission of around 1.5 molecules/cm3/s.
Describe your problem or question:
It is my understanding that emissions must be inputted both as molecular emissions and particular emissions. In the aircraft emissions files, the units were:
emiss_aircraft:units = "molecules/cm3/s"
num_bc_a4_aircraft:units = "(particles/cm2/s)(molecules/mole)(g/kg)"
I understand the conversion between molecules and particles includes using the diameter of Aitken mode particles and the (molecules/mole)(g/kg) factor is just an idiosyncrasy of CESM. However, I am confused as to how I am to convert between cm2 and cm3. My understanding is that cm2 should be for surface emissions, not vertical emissions but somehow the molecular emission must be converted to a particular emission with a different emission.
I am quite confused and would really appreciate any help that could be provided!
Files used:
/atm/cam/chem/emis/CMIP6_emissions_2000climo/emissions-cmip6_bc_a4_aircraft_vertical_2000climo_0.9x1.25_c20170322.nc
/atm/cam/chem/emis/CMIP6_emissions_2000climo/emissions-cmip6_num_bc_a4_aircraft_vertical_2000climo_0.9x1.25_c20170322.nc