Namelist parameters associated with atmosphere schemes
chemUCI and Linoz v3
Parameter
Description
Default value*
airpl_emis_file
Aviation emission
chlorine_loading_file
Chlorine loading
chlorine_loading_fixed_ymd
chlorine_loading_type
ext_frc_specifier
3-D emissions
ext_frc_cycle_yr
ext_frc_type
srf_emis_specifier
Surface emissions
srf_emis_cycle_yr
srf_emis_type
Upper bound of mean raindrop diameter
linoz_data_file
Linoz data file
linoz_data_cycle_yr
linoz_data_path
linoz_data_type
lght_no_prd_factor
Lightning NOx emission factor
5.0
fstrat_efold_list
Tracer (from troposphere) list with e-folding decay in the stratosphere
Many of these namelist parameters specify input data files. Check the atm_in file for examples or refer to the Users' Guide.
Cloud Layers Unified By Binormals
Parameter
Description
Default value
gamma_coef
Width of vertical velocity within a Gaussian PDF component at low skewness
0.12
gamma_coefb
Width of vertical velocity within a Gaussian PDF component at high skewness
0.28
C8
Coefficient of damping of third moment of vertical velocity, w’3
5.2
C1
Coefficient of damping of second vertical moment of vertical velocity, w’2, at low skewness
2.4
C14
Coefficient of damping of second horizontal moments of vertical velocity, u’2 and v’2
2.0
c_k10
Ratio of diffusivity of momentum to heat
0.35
Dust aerosol
Parameter
Description
Default value
dust_emis_scheme*
The v3 dust emission scheme (Kok et al., 2014)
2 (set to 1 to switch to the v1/v2 scheme)
*This parameter is set in user_nl_drv
HOMME
Parameter
Description
Default value
se_tstep
Main dycore timestep. Additional parameters control the hyper viscsosity, trancer and vertical remap timesteps, which are derived from se_tstep. units = seconds
Scales linearly with horizontal resolution. NE30 default: 300
nu
Tensor hyperviscosity coefficient, independent of spatial resolution. units = 1/s
Select between semi-lagrangian and Eulerian based transport schemes
12 = semi-lagranian method with monotinicity and mass preservation
statefreq
print a varieity of dycore metrics to the atm.log file every “statefreq” timesteps
480
vert_remap_alg
Algorithm used to remap the vertically lagrangian levels back to the reference levels
10 = strict monotonicity applied on top of a 2nd order accurate PPM method
se_ftype
Controls how physics tendencies are applied. 0=”dribbled” in during dynamics timesteps. 1=”hard adjustment” after each physics timestep. 2=hybrid approach: hard adjustment for tracers, dribbled for remaining tendencies
2
Modal Aerosol Module
Parameter
Description
Default value
is_output_interactive_volc
Switch for diagnostic output of the stratospheric aerosol optics
.false.
mam_amicphys_optaa
Recommended option of the new time-splitting treatment of H2SO4 production and loss
1 (0 to turn it off)
n_so4_monolayers_pcage
Number of monolayers required to age primary-carbon mode particles
3
seasalt_emis_scale
Tuning parameter for sea salt emission
0.55
OCEANFILMS
Parameter
Description
Default value
mam_mom_cycle_yr
1
mam_mom_datapath
Full pathname of the directory that contains the files specified in mam_mom_filelist
'atm/cam/chem/trop_mam/marine_BGC/'
mam_mom_filename
Filename of file that contains a sequence of filenames for prescribed marine organic matter ocean concentrations. The filenames in this file are relative to the directory specified by mam_mom_datapath.
Type of time interpolation for data in mam_mom files. Can be set to 'CYCLICAL', 'SERIAL', 'INTERP_MISSING_MONTHS', or 'FIXED'.
'CYCLICAL'
mam_mom_cycle_yr
The cycle year of the prescribed aerosol flux data if mam_mom_type is 'CYCLICAL'. Format: YYYY
1
mam_mom_fixed_ymd
The date at which the prescribed aerosol flux data is fixed if mam_mom_type is 'FIXED'. Format: YYYYMMDD
0
mam_mom_fixed_tod
The time of day (seconds) corresponding to mam_mom_fixed_ymd at which the prescribed aerosol flux data is fixed if mam_mom_type is 'FIXED'.
0
mam_mom_bubble_thickness
Bubble film thickness (in m) for marine organic aerosol emission mechanism. The physically reasonable range is approximately (0.1 - 1) x 10^ -6.
0.1e-6
mam_mom_mixing_state
Switch to select mixing state assumption in marine organic aerosol code. Currently implemented options: 0 : total external mixture, add to mass; 1 : total external mixture, replace mass; 2 : total internal mixture, add to mass; 3 : total internal mixture, replace mass.
0 [Note: set to 3 in the atm_in namelist]
mam_mom_parameterization
Selection of alternate parameterizations for marine organic matter emissions. Set fmoa=1 for Burrows et al. (2014) 1 parameterization; fmoa=2 for Gantt et al. (2011) 2 parameterization; fmoa=3 for simple parameterization based on Quinn et al., 2014; 3 fmoa=4 for Rinaldi et al. (JGR, 2013).* 4
1
*Note: non-default values have not been carefully tested and may not work as expected.
Predicted Particle Properties
Parameter
Description
Default value
do_prescribed_ccn
Turn on the prescribed CCN if true
false
micro_aerosolactivation
Turn on aerosol activation if true
true
micro_p3_lookup_dir
Directory of P3 look-up tables
inputdata/atm/cam/physprops
micro_p3_tableversion
P3 look-up table Version
4.1.2
micro_subgrid_cloud
Sub-grid cloud properties
true
micro_tend_output
Output of P3 microphysical process rates
false
p3_accret_coeff
Tunable parameter for adjusting rain accretion efficiency
117.25
p3_autocon_coeff
Tunable parameter for adjusting droplet autoconversion efficiency
30500
p3_embryonic_rain_size
Radius of embryomic raindrops from auto-conversion
0.000025 (m)
p3_max_mean_rain_size
Upper bound of mean raindrop diameter
0.005 (m)
p3_mincdnc
Lower bound of droplet number concentration
20.d6 (# m-3)
p3_nc_autocon_expon
Nc exponent in droplet auto-conversion
-1.1
p3_qc_accret_expon
Qc exponent in rain accretion
1.15
p3_qc_autocon_expon
Qc exponeent in droplet autoconversion
3.19
p3_wbf_coeff
Tunable parameter for adjusting WBF efficiency
1.0
do_cooper_inp3
Turn on Cooper ice nucleation scheme if true
false
Rapid Radiative Transfer Model for GCMs
Parameter
Description
Default value
iradsw
Frequency for updating shortwave fluxes and heating rate; iradsw > 0 interpreted as number of timesteps, iradsw < 0 interpreted as hours; iradsw = 0 disables shortwave radiation entirely
-1
iradlw
Frequency for updating longwave fluxes and heating rate; iradlw > 0 interpreted as number of timesteps, iradlw < 0 interpreted as hours; iradlw = 0 disables longwave radiation entirely
-1
irad_always
Length of time in timesteps (irad_always > 0) or in hours (irad_always < 0) SW/LW radiation will be run continuously from the start of an initial or restart run
0
use_rad_dt_cosz
If true, use the radiation dt for all cosz calculations; calculates solar zenith angle averaged over a time step. In default model solar zenith angle is held constant over time
.true. (set by namelist_defaults_eam.xml for default physics)
spectralflux
Calculate fluxes (up and down) per band
.false.
liqcldoptics
Choice of cloud optical property parameterization for liquid clouds. Valid options are ‘slingo’ or ‘gammadist’
gammadist
icecldoptics
Choice of cloud optical property parameterization for ice clouds. Valid options are ‘ebertcurry’ or ‘mitchell’
mitchell
Zhang and McFarlane deep convection scheme
ZM Parameters
Description
Default value
zmconv_ke
Tunable evaporation efficiency in ZM deep convection scheme
2.5E-6
zmconv_tau
Relaxation time in ZM deep convection scheme
3600
zmconv_dmpdz
Parcel fractional mass entrainment rate
-0.7E-3
zmconv_alfa
Initial downdraft mass flux fraction
0.14D0
zmconv_tiedke_add
Temperature perturbation of an air parcel
0.8D0
zmconv_cape_cin
Number of negative buoyancy regions that are allowed
1
dCAPE-ULL Parameters
Description
Default value
zmconv_trig_dcape
Enable dynamic CAPE (DCAPE) trigger for ZM deep convection
.false.
zmconv_trig_ull
Enable unrestricted launch level (ULL) mode for ZM deep convection
.false.
Conv. micro. Parameters
Description
Default value
zmconv_microp
Convective microphysics option in ZM convection scheme
true
zmconv_auto_fac
Cloud droplet-rain autoconversion enhancement factor in the convective microphysics scheme
7.0
zmconv_accr_fac
Cloud droplet-rain accretion enhancement factor in the convective microphysics scheme
1.5
zmconv_micro_dcs
Autoconversion size threshold for cloud ice to snow (m)
150.E-6
Mass flux adj. Parameters
Description
Default value
zmconv_clos_dyn_adj
Apply mass flux adjustment to ZM convection scheme
true
MCSP Parameters
Description
Default value
zmconv_mcsp_heat_coeff
MCSP heating coefficient
0.3
zmconv_mcsp_moisture_coeff
MCSP moisture coefficient
0.0
zmconv_mcsp_uwind_coeff
MCSP zonal wind coefficient
0.0
zmconv_mcsp_vwind_coeff
MCSP meridional wind coefficient
0.0
Cloud Feedback Model Intercomparison Project (CFMIP) Observation Simulator Package
Parameter
Description
Default value
cosp_lite
This namelist sets cosp_ncolumns=10 and cosp_nradsteps=3 (appropriate for COSP statistics derived from seasonal averages), and runs MISR, ISCCP, MODIS, and CALIPSO lidar simulators (cosp_lmisr_sim=.true.,cosp_lisccp_sim=.true., cosp_lmodis_sim=.true.,cosp_llidar_sim=.true.).
false
Orographic drag schemes
Parameter
Description
Default value
use_gw_oro
This namelist controls the default linear orographic gravity wave drag (oGWD) for E3SM, if used, the default oGWD is turned on.
true
do_tms
This namelist controls the default Turbulent Mountain Stress (TMS) for E3SM, if used, the default TMS is turned on.
false
effgw_oro
Efficiency associated with orographic gravity waves.
0.375
tms_orocnst
Turbulent mountain stress parameter used when TMS calculation is turned on
1.0
tms_z0fac
Factor determining z_0 from orographic standard deviation [ no unit ] for TMS.
0.75
use_od_ls
This namelist controls the new nonlinear oGWD, if used, the nonlinear oGWD is turned on. use_od_ls should not be used at the same time with use_gw_oro.
false
use_od_bl
This namelist controls the Flow-blocking drag (FBD) scheme, if used, the FBD scheme is turned on.
false
use_od_ss
This namelist controls the small-scale GWD (sGWD) scheme, if used, the sGWD scheme is turned on.
false
use_od_fd
This namelist controls the Turbulent orographic form drag (TOFD) scheme, if used, the TOFD scheme is turned on.
false
od_ls_ncleff
Tuning parameter of nonlinear oGWD. Stands for effective resolution of the grid for oGWD. Scales the magnitude of nonlinear oGWD.
3
od_bl_ncd
Tuning parameter of FBD. Stands for bulk drag coefficient. Scales the magnitude of FBD.
3
od_ss_sncleff
Tuning parameter of sGWD. Stands for effective resolution of the grid for sGWD.Scales the magnitude of sGWD.
1
S. M. Burrows, O. Ogunro, A. A. Frossard, L. M. Russell, P. J. Rasch, and S. M. Elliott. A physically based framework for modeling the organic fractionation of sea spray aerosol from bubble film Langmuir equilibria. Atmospheric Chemistry and Physics, 14(24):13601–13629, December 2014. URL: https://acp.copernicus.org/articles/14/13601/2014/ (visited on 2024-03-29), doi:10.5194/acp-14-13601-2014. ↩
Patricia K. Quinn, Timothy S. Bates, Kristen S. Schulz, D. J. Coffman, A. A. Frossard, L. M. Russell, W. C. Keene, and D. J. Kieber. Contribution of sea surface carbon pool to organic matter enrichment in sea spray aerosol. Nature Geoscience, 7(3):228–232, March 2014. URL: https://www.nature.com/articles/ngeo2092 (visited on 2024-04-25), doi:10.1038/ngeo2092. ↩
Matteo Rinaldi, Sandro Fuzzi, Stefano Decesari, Salvatore Marullo, Rosalia Santoleri, Antonello Provenzale, Jost Von Hardenberg, Darius Ceburnis, Aditya Vaishya, Colin D. O'Dowd, and Maria Cristina Facchini. Is chlorophyll‐ \textit a the best surrogate for organic matter enrichment in submicron primary marine aerosol? Journal of Geophysical Research: Atmospheres, 118(10):4964–4973, May 2013. URL: https://agupubs.onlinelibrary.wiley.com/doi/10.1002/jgrd.50417 (visited on 2024-04-25), doi:10.1002/jgrd.50417. ↩