cam-chem

Hi all, I tried to add 'co2_cycle' into my simulation (FCHIST), but it failed with an error: "CO2&IC is already on the list". I added '-co2_cycle' to `CAM_CONFIG_OPTS` and also added 'co2_flag=.true.' in `atm_in`. Looking forward to your reply. Best regards, Haven

Hi all, I have a couple of FCnudged cases using MUSICA. These are running on Derecho using CESM2.2.0. One of them works, the other doesn't, and I'm not sure why this is. In the case that doesn't run, I get the following error in the atm logs: FIND_TIMES: ALL data times are after...

Hi, I'm a new user of CESM and CAM. I'm attempting to replicate a study described in this paper: Global environmental implications of atmospheric methane removal through chlorine-mediated chemistry-climate interactions - Nature Communications. However, I'm currently facing some confusion...

Hi, all. I'm running MUSICA for compset FCts2nudged on NCAR Derecho. The version is cesm2.2-asdbranch. I want to have 3-hr outputs for some variables, so I set up the second and third history outputs in user_nl_cam as: "avgflag_pertape(3) = 'A', avgflag_pertape(4) = 'A', mfilt(3) = 8...

Hi, CESM community, I just want to be clear about the model output so as to clearly interpret my model results. I have "OC", and "SOA" in my model output. Are these OC and SOA completely isolated? OC refers to primary organic aerosol (POA), and SOA refers to Secondary organic aerosol. This is...

Greetings, How could I know from a simple CESM run, if I am using CAM or CAM-Chem?. How could I switch/change from to another? Thanks.

Hi, In the input data repository (https://svn-ccsm-inputdata.cgd.ucar.edu/trunk/inputdata/atm/cam/chem/emis/emissions_ssp126/), I can see biomass burning (bb) and anthropogenic (anthro) emissions .nc files. I am wondering do these files include the emissions from agricultural activities. For...

Hi all, I have a run of CAM6-Chem from CESM2.1.3 with coupled land (CLM5-BGC-Crop) and oceans (POP2) forced by SSP1-2.6 GHGs and land use. I wanted to look at some convection parameters, however the output from the model for CIN was 0 everywhere and the output for CAPE was an order of magnitude...

Hi all, I ran a CAM-Chem case in CESM2.1.3 and output CIN, but all values were 0. I've seen elsewhere that this is a known issue with CAM-Chem and that CIN tends only to be output by WACCM (I guess this is my fault for going for the cheaper model). I'd like to calculate CIN manually but the...

Hi all, I'm setting up some experiments on a regionally-refined grid and doing some emissions processing. I was wondering if there are files containing soil emissions of NH3 and NOx (which would be included as NH3_other_surface) at a grid resolution higher than 0.9x1.25? I've processed raw...

Dear All, I am running two FHIST_BGC cases to study the impact of LULCC on radiative forcing of GHGs in global, without considering their feedback. This needs GHGs to be sent from the land to the atmosphere, and not from the atmosphere to the land. The default CCSM_BGC = CO2A, it says "adds...

Greetings to everyone, I am trying to run an initial case with CESM2.2/CAM6 but without aerosols. Looking at the CAM6 documentation (Section 8.4) and in a previous post in this forum there are some indication how to do that by adding the following to user_nl_cam: I followed that and when I...

I'm running sensitivity experiments where I have increased the soil flux of NO through the input file. When I plot the emissions data from the input file, it does not match the output variable SFNO, which is supposedly the surface flux of NO. I implemented the change by altering the namelist...

Hi all, I'm working with MUSICA and need to generate a topography file for my variable-resolution grid. I am following the instructions for the 'Topo' tool. When I run ./cube_to_target, the script fails with: error while loading shared libraries: libnetcdff.so.7: cannot open shared object...

I have previously been running the BWma1850 compset, where the point has been to run the CESM with my own volcanic forcing file (i.e. by creating a new VolcanEESM... in the stratvolc directory) such that the evolution of stratospheric aerosol from SO2 emissions are calculated by the model. The...

Hi, I want to conduct experiments branching off from CESM2 amip experiment same as the CMIP6 amip run. There are a lot of F compsets, like F2000climo, FWHIST, etc. I know CESM1 has a compset named F_AMIP_CAM5, but I didn't find the similar version in CESM2. Thanks! Best, Melody

I found the change in emissions is also changing the surface temperature even when the passive radiative forcing is True (chem_rad_passive = .true.). I am not sure what is driving this change in temperature in CESM2.1.3 (FMOZ compset; CAM4-Chem, CLM5). Are there any control options...

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...

Hello there! I am a new user to WACCM/CAM and I am interested in adding alumina emissions at altitude. However, I am confused how to specify the particle distribution size for my emissions. I am also curious to learn how to add optical properties such that WACCM computes the radiative forcing...

Hi all, I've made a regionally-refined grid using MUSICA by following the steps in the tutorial. However, case.build fails with: ERROR: Could not initialize Grids when I try to build the case. It's a case using the FCHIST compset and I'm running CESM2.2.0 on Cheyenne. I'm not sure where to...