aerosol

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, I am a student working with a CAM6 model output (not CAM-Chem). I want to derive the mass and number concentrations of a certain aerosol type and I have several questions about the aerosol outputs: 1. For example, if the coarse mode include dust, bc, soa etc... Does the output "num_a1"...

Hi everyone, I am running CAM4 on CESM2.1.3, but would like to have a better Aerosol-Cloud Interaction. I therefore tried to change the microphysics package to the one developed for CESM5, by running: ./xmlchange --append CAM_CONFIG_OPTS='-microphys mg1'. I can build the case, however when...

Hello everyone I added a new aerosol with dust components in CESM, but I don’t want this new aerosol to have radiation effects. I just want it to be transported and settled along with the dust aerosol. I tried setting the parameters in the '&rad_cnst_nl' corresponding radiation file to 0 or a...

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 have recently been looking at the paper Climate variability and change since 850 CE (Climate Variability and Change since 850 CE: An Ensemble Approach with the Community Earth System Model) and the corresponding data sets that go with it at www2.cesm.ucar.edu/models/experiments/LME. What I...

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, I am attempting to do an uncertainty analysis for some of the prescribed parameters in the aerosol model, such as hygroscopicity of aerosol components and the size ranges of the aerosol modes. Attached are the tables describing these values in the documentation. I am trying to locate the...

Hello, I have the input data for B2000CAM5CN (e.g. ar5_mam3_oc_surf_2000_c090726.nc). The unit for OC emission is molecules/cm2/s. I want to compare the emissions from EDAGR (emission unit is [kg/m2/s]) and that from CESM input data. So, how can I convert [molecules/cm2/s] to [kg/m2/s]? I...

Hi, I am running a single column simulation for CAM, in order to model variability in radiative forcing due to anthropogenic surface aerosol. In the SCAM compset, aerosol species are relaxed to the aerosol climatologies in the initial profile. I would like to get an idea of how much...

Hi all，I want to know how to turn off the indirect radiation effects of aerosols.

Hi, I am replicating a sensitivity analysis conducted using the Global Model of Aerosol Processes (GLOMAP), with a SCAM6 simulation using the MAM4 aerosol representation. As a first step, I'm trying to match input variables used in the GLOMAP analysis, with namelist variables in SCAM6, which I...

Hi Everyone, I am trying to add a new inventory for dust aerosols over a certain region in CESM2-CLM5. My objective is to modify dust aerosols over a particular region and add my inventory. So far I have looked into this code in CLM5 which controls the dust emission...

So, I've been talking a bit with Simone about this, but I thought I would post it here for others. The bc_a4 file for srf_emis_specifier is the surface emissions of black carbon. This has units of molecules/cm2/s. The num_a4 file is the particle number emissions file for the surface black...

Hi folks, I'm trying to do a set of simulations in CAM5, run in atmosphere-only mode (F_1850_CAM5 compset), that modifies the input emissions of DMS to reduce emissions in a specific region. I'm in search of information on the correct diagnostics for DMS and on how CAM5 handles DMS emissions so...