chemistry

Hi all, I am trying to run a simulation in CESM2.1.5-CAM6 with trop_mam4 chem and MERRA2 offline_dyn to see the impact of turning off H2O2->Sulfate and Ozone->Sulfate aqueous reactions. I am trying this by copying the mo_usrrxt.F90 (found in $MODELROOT/components/cam/src/chemistry/mozart) in my...

Hi forum, It's not clear to me how the reaction rate of SO2 (gas) + OH -> H2SO4 (gas) is calculated in CAM6. The equation report in chem_mech.doc gives this reaction as d(H2SO4)/dt = r3*OH*SO2. When looking through mo_usrrxt.F90 I find this expression for the reaction rate (rxt)...

Hi all, For some air quality calculations, I'd like to output the bottom 2 layers of a few fields. Starting with temperature and O3, I can get the surface temperature with 'TS' and the the surface O3 concentration with 'O3_SRF'. Is there a way to get just the bottom 2 layers of the atmosphere...

To Whom this may concern, Looking through the chem_mech.doc it appears that HONO (nitrous acid) is not represented as a chemical species in the model. I was wondering if there is any confirmation if that is correct, and if it is which documentation/papers should I look at? The compset used in...

I wanna add some external forcing in pp_waccm_mozart_mam3 by modifying mo_extfrc.F90 and other files. However, something confused me when I read the source code in chemistry/pp_waccm_mozart_mam3/mo_nln_matrix.F90 file. In this file, array of mat contain 527 index(species) that is correspond to...

Hi all, I'm a CESM2 novice interested in BVOC emissions. I'm planning some runs using a CESM2 build that couples CLM5 and CAM6. I know that the MEGAN model in CLM5 produces various BVOC species and that CAM6 can be set to show the MEGAN fluxes from the land to the atmosphere by adding the...

Hi I am planing a long time (more than 200 years) run for FHIST_BGC case, and I find the atm takes more than 80 percent of the total run time. So, I would like to close the atmospheric chemistry to reduce run cost. I attempt to only change the CAM_CONFIG_OPTS from "-phys cam6" to "-phys cam6...

Dear all, I'm running CAM-chem simulation with CESM2.1.0 and I want to add heterogeneous reactions in the FCHIST compset. Where should I change the chemical mechanism? Which file should I add the reactions and individualized reaction rate constant? I really appreciate your helps.