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I recently used CESM2.2.0 to simulate global near-surface gaseous sulfuric-acid concentrations. The results look wrong: over East and South Asia the modeled near-surface gaseous H₂SO₄ mixing ratios are extremely low. I made no other modifications—just ran the standard workflow.

Hi everyone Recently, I need to use MOSAIC scheme in CESM to finish my final project of one course. I have used CESM2.2.2 but I have never used chemsitry related models so I have many questions: 1. I do not know if I couple this scheme correctly. At the beginning, I follow Use MOSAIC scheme...

What version of the code are you using? CESM2.2 and CAM6 Have you made any changes to files in the source tree? Changes in the nudging module and the dust scheme Describe your problem or question: From the documentation I see that besides the AODDUST, it is possible to get the AODDUST for...

What version of the code are you using? ctsm5.1.dev159 Describe your problem or question: May I get information on the default CO2 forcing data that is used in CTSM? The directory for the data is: /glade/p/cesmdata/cseg/inputdata/atm/datm7/CO2/fco2_datm_global_simyr_1750-2014_CMIP6_c180929.nc...

Hi all, I went though some of the forum threads and saw that you can use daily emissions datasets with CAM. I looked at some of the extended inventories as mentioned here Emission Inventories - CAM-Chem - wiki.ucar.edu, and while for biomass burning they're present, there seems to be no such...

Hello everyone, I am using CESM1.2 with the CAM4 component for a paleoclimate simulation with an ancient topography. I have set up globally uniform aerosol forcing by modifying the input files for prescribed aerosols (prescribed_aero_file) and aerosol deposition fluxes (aerodep_flx_file) to be...

Dear Community, I run a CESM2.2.0 case with FCSD compset during 1980-2022. The resolution is 0.9°*1.25° with 56 vertical levels. The meteorological field is nudged to MERRA2 and CMIP6 historical emissions are used. I want to analyse the contribution of STT (Stratosphere-to-Troposphere...

Dear Community, I am interested in comparing the differences in BVOC species (e.g., ISOP) contributions to SOA formation rates between two sets of atmospheric-only simulations—one with higher O₃ concentrations and one with lower O₃ concentrations. Could you please advise which variable would...

What version of the code are you using? CESM2.2.2, CAM6 Have you made any changes to files in the source tree? Changes in nudging and CLM Describe every step you took leading up to the problem: I need to use ERA5 re-analisys files to nudge aerosols. Describe your problem or question: I...

I am running simulation with CESM2.1.4. The model uses MAM4 to calculate aerosol number concentration and mass concentration. What I want to do: Simulation 1: output the emission flux of dust (both number and mass flux) Simulation 2: read in the (daily) output of dust number and mass flux from...

Hi everyone, I am trying to model HFCs using CESM2.1.5. Wondering if there are any compsets that contain HFCs or HFC-134a-equivalent in its lower boundary condition files? I have found CFC11eq in other compsets (such as FW1850) but no HFCs. I would really appreciate any help on this!

Hi, I am using the cesm3_beta06 version code, and want to know if there is any compset that satisfies the requirements of turning on the CAM-Chem and BGC with nudged wind? By looking at the compset website ( CESM2.2.2 Component Sets Definitions ), I only find that the FCfireHIST has the...

What version of the code are you using? CESM2.2.2 Have you made any changes to files in the source tree? Changes in dust scheme and nuding Describe every step you took leading up to the problem: I need to create new emissions for current months of 2025 and I need some specific NCL libraries...

Hello everyone, I'm using cesm version 2.1.3, create_newcase --res f19_g16 --compset FHIST, I tried to add some new chemistries in chem_mech.in to simulate, CAM_CONFIG_OPTS： -phys cam6 -chem trop_strat_mam4_vbs; CAM_NML_USE_CASE：2010_trop_strat_vbs_cam6， and the source code has been modified...

Hi, all I run a offline clm5.0, the MEG_isoprene is a default output, but when I changed to run the FHIST case with cesm2.1.3, I can not find MEG_xx in clm2.h0 and cam.h0 files, I would like to ask if the model is coupled, why the MEG_isoprene is disappeared from clm2.h0 files... or I need to...

Hi, I am currently trying to remove the radiative effects of dust_a1 in CESM2.1.5 but am running into issues and do not know the rrtmg code so well. I have seen other similar issues on the forum such as here and here but they were either not answered or I could not apply the proposed...

Hi all, Has anyone succesfully run MUSICA (i.e. CAM-Chem on a variable-resolution SE grid) with future (SSP) emissions? I've run into numerous problems attempting to do this following the approved procedure of using NCAR-provided tools to regrid and then rename raw CMIP6 emissions, and I'm...

What version of the code are you using? CESM2.2.1/CAM6 in Derecho Have you made any changes to files in the source tree? Some changes in the nudging module Describe every step you took leading up to the problem: After modifying the nudging module I want to see how the q-array where are all the...

Hello, recently I've been simulating SOA formation using the CAM-Chem module, and I have some questions regarding the mo_prod_loss.F90 file. Specifically, I'd like to ask about the origin of the coefficients used in the production code for species 165–169 (SOAG0–SOAG5). For example...

I have the following questions： I found the list of atmospheric variables in the case I ran in the atm_in file, but I don't know where to look up the specific meaning of these variables, such as: bc_a1, bc_a4. This is the original atm_in file: aer_drydep_list = 'bc_a1', 'bc_a4', 'dst_a1'...