Listing of the steering parameters in alphabetical order

Initialization parameters (NAMELIST Group = I), run parameters (R), plant canopy parameters (C), package parameters (P) as well as user-defined parameters (U) are alphabetically listed in the following table.
















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Parameter Name	NAMELIST Group	Parameter Class	FORTRAN Type	Default Value	Explanation
alloc_factor	P	particles	R	20.0	Factor (in percent) describing the memory allocated additionally to the memory needed for initial particles at a given grid cell.
alpha_lad	C	canopy	R	9999999.9	Coefficient for construction of leaf area density profile.
alpha_surface	I	others	R	0.0	Inclination of the model domain with respect to the horizontal (in degrees).
averaging_interval	R	output	R	0.0	Averaging interval for all output of temporally averaged data (in s).
averaging_interval_pr	R	output	R	value of averaging_interval	Averaging interval for vertical profiles output to local file DATA_1D_PR_NETCDF (in s).
averaging_interval_sp	R	output	R	value of averaging_interval	Averaging interval for spectra output to local file DATA_1D_SP_NETCDF (in s).
bc_e_b	I	bc	C*20	'neumann'	Bottom boundary condition of the TKE.
bc_lr	I	bc	C*20	'cyclic'	Boundary condition along x (for all quantities).
bc_ns	I	bc	C*20	'cyclic'	Boundary condition along y (for all quantities).
bc_p_b	I	bc	C*20	'neumann'	Bottom boundary condition of the perturbation pressure.
bc_p_t	I	bc	C*20	'dirichlet'	Top boundary condition of the perturbation pressure.
bc_par_b	P	bc	C*15	'reflect'	Bottom boundary condition for particle transport.
bc_par_lr	P	bc	C*15	'cyclic'	Lateral boundary condition (x-direction) for particle transport.
bc_par_ns	P	bc	C*15	'cyclic'	Lateral boundary condition (y-direction) for particle transport.
bc_par_t	P	bc	C*15	'absorb'	Top boundary condition for particle transport.
bc_pt_b	I	bc	C*20	'dirichlet'	Bottom boundary condition of the potential temperature.
bc_pt_t	I	bc	C*20	'initial_gradient'	Top boundary condition of the potential temperature.
bc_q_b	I	bc	C*20	'dirichlet'	Bottom boundary condition of the specific humidity / total water content.
bc_q_t	I	bc	C*20	'neumann'	Top boundary condition of the specific humidity / total water content.
bc_s_b	I	bc	C*20	'dirichlet'	Bottom boundary condition of the scalar concentration.
bc_st	I	bc	C*20	'neumann'	Top boundary condition of the scalar concentration.
bc_sa_t	I	bc	C*20	'neumann'	Top boundary condition of the salinity.
bc_uv_b	I	bc	C*20	'dirichlet'	Bottom boundary condition of the horizontal wind components u and v.
bc_uv_t	I	bc	C*20	'dirichlet'	Top boundary condition of the horizontal velocity components u and v.
beta_lad	C	canopy	R	9999999.9	Coefficient for construction of leaf area density profile.
bottom_salinityflux	I	bc	R	0.0	Kinematic salinity flux near the surface (in psu m/s).
building_height	I	topo	R	50.0	Height of a single building in m.
building_length_x	I	topo	R	50.0	Width of a single building in m.
building_length_y	I	topo	R	50.0	Depth of a single building in m.
building_wall_left	I	topo	R	building centered in x-direction	x-coordinate of the left building wall in m.
building_wall_south	I	topo	R	building centered in y-direction	y-coordinate of the South building wall in m.
c_sedimentation	I	cloud physics	R	2.0	Courant number of sedimentation process
call_psolver_at _all_substeps	I	num	L	.T.	Switch to steer the call of the pressure solver.
call_microphysics_at _all_substeps	I	cloud physics	L	.F.	Switch to steer the call of 2-moment microphysics.
canopy_drag_coeff	C	canopy	R	0.0	Drag coefficient used in the plant canopy model?.
canopy_mode	I	canopy	C*20	'block'	Canopy mode. Parameter moved to NAMELIST canopy_par starting at rev. 1485.
canyon_height	I	topo	R	50.0	Street canyon height in m.
canyon_width_x	I	topo	R	9999999.9	Street canyon width in x-direction in m.
canyon_width_y	I	topo	R	9999999.9	Street canyon width in y-direction in m.
canyon_wall_left	I	topo	R	canyon centered in x-direction	x-coordinate of the left canyon wall in m.
canyon_wall_south	I	topo	R	canyon centered in y-direction	y-coordinate of the South canyon wall in m.
cfl_factor	I	num	R	0.1, 0.8 or 0.9 (see parameter description)	Time step limiting factor.
clip_dvrp_l	P	dvr	R	0.0	Left boundary of the displayed domain (in m).
clip_dvrp_n	P	dvr	R	(ny + 1)*dy	North boundary of the displayed domain (in m).
clip_dvrp_r	P	dvr	R	(nx + 1)*dx	Right boundary of the displayed domain (in m).
clip_dvrp_s	P	dvr	R	0.0	South boundary of the displayed domain (in m).
cloud_droplets	I	mode	L	.F.	Parameter to switch on usage of cloud droplets.
cloud_physics	I	mode	L	.F.	Parameter to switch on the condensation scheme.
cloud_scheme	I	mode	C*20	'seifert_beheng'	Parameter to choose cloud physics scheme.
cluster_size	P	dvr	I	1	Vertex cluster size for polygon reduction of topography.
collective_wait	I	num	L	see parameter description	Set barriers in front of collective MPI operations.
collision_kernel	P	particles	C*15	'none'	Parameter to steer cloud droplet growth by collision processes.
color_interval	P	dvr	R(2)	0.0, 1.0	Interval of values used for determining the particle color displayed in the animation.
comp_spectra_level	P	output	I(100)	no level	Vertical level for which horizontal spectra are to be calculated and output (gridpoints).
conserve_volume_flow	I	mode	L	.F.	Conservation of volume flow in x- and y-direction.
conserve_volume _flow_mode	I	mode	C*16	'default'	Modus of volume flow conservation.
coupling_start_time	I	mode	R	0.0	Simulation time of a precursor run..
cpu_log_barrierwait	R	MPI	L	.F.	Set an MPI-barrier at the beginning of each cpu-time measurement.
create_disturbances	R	run steering	L	.T.	Switch to impose random perturbations to the horizontal velocity field.
cross_profiles	R	output	C*100(100)	see parameter description	Determines which vertical profiles are to be presented in which coordinate system if the plot software palmplot is used.
cthf	R	canopy	R	0.0	Average heat flux that is prescribed at the top of the plant canopy (in K m/s). Parameter moved to NAMELIST canopy_par starting at rev. 1485.
curvature_solution _effects	I	cloud physics	L	.F.	Parameter to consider solution and curvature effects on the equilibrium vapor pressure of cloud droplets.
cycle_mg	I	num	C*1	'w'	Type of cycle to be used with the multi-grid method.
damp_level_1d	I	ini	R	zu(nz + 1)	Height where the damping layer begins in the 1d-model (in m).
data_output	R	output	C*10(100)	100*' '	Quantities for which 2d cross section and/or 3d volume data are to be output.
data_output_pr	R	output	C*10(100)	100*' '	Quantities for which vertical profiles (horizontally averaged) are to be output.
data_output_pr_user	U	output	C*10(200)	200*' '	User defined quantities for which horizontally averaged profile data is to be output.
data_output_user	U	output	C*10(100)	100*' '	User defined quantities for which 2d cross section and/or 3d volume data are to be output.
data_output_2d_on _each_pe	R	output	L	.T.	Output 2d cross section data by one or all processors.
density_ratio	P	particles	R(10)	0.0, 9*9999999.9	Ratio of the density of the fluid and the density of the particles.
dissipation_classes	P	particles	I	10	Number of dissipation classes to be used in the collision efficiency table.
dissipation_1d	I	ini	C*20	'as_in_3d_model'	Calculation method for the energy dissipation term in the TKE equation of the 1d-model.
disturbance_amplitude	R	run steering	R	0.25	Maximum perturbation amplitude of the random perturbations imposed to the horizontal velocity field (in m/s).
disturbance_energy _limit	R	run steering	R	0.01	Upper limit value of the perturbation energy of the velocity field used as a criterion for imposing random perturbations (in m2/s2).
disturbance_level_b	R	run steering	R	zu(3) or zu(nz*2/3)	Lower limit of the vertical range for which random perturbations are to be imposed on the horizontal wind field (in m).
disturbance_level_t	R	run steering	R	zu(nz/3) or zu(nzt-3)	Upper limit of the vertical range for which random perturbations are to be imposed on the horizontal wind field (in m).
do2d_at_begin	R	output	L	.F.	Output 2d cross section data by one or all processors.
do3d_at_begin	R	output	L	.F.	Output of 3d volume data at the beginning of a run.
dp_external	R	mode	L	.F.	External pressure gradient switch.
dp_smooth	R	mode	L	.F.	Vertically smooth the external pressure gradient using a sinusoidal smoothing function.
dp_level_b	R	mode	R	0.0	Lower limit of the vertical range for which the external pressure gradient is applied (in m).
dpdxy	R	mode	R(2)	2*0.0	Values of the external pressure gradient applied in x- and y-direction, respectively (in Pa/m).
drag_coefficient	I	canopy	R	0.0	Drag coefficient used in the plant canopy model. Parameter renamed canopy_drag_coeff starting at rev. 1485, and moved to NAMELIST canopy_par.
drizzle	I	cloud physics	L	.T.	Parameterize drizzle in cloud physics scheme.
dt	R	run steering	R	variable	Time step for the 3d-model (in s).
dt_averaging_input	R	output	R	0.0	Temporal interval of data which are subject to temporal averaging (in s).
dt_averaging _input_pr	R	output	R	value of dt_averaging_input	Temporal interval of data which are subject to temporal averaging of vertical profiles and/or spectra (in s).
dt_coupling	R	ocean	R	9999999.9	Temporal interval for the data exchange in case of runs with coupled models (e.g. atmosphere - ocean) (in s).
dt_data_output	R	output	R	9999999.9	Temporal interval at which data (3d volume data, cross sections, vertical profiles, spectra) shall be output (in s).
dt_data_output_av	R	output	R	value of dt_data_output	Temporal interval at which time averaged 3d volume data and/or 2d cross section data shall be output (in s).
dt_disturb	R	run steering	R	9999999.9	Temporal interval at which random perturbations are to be imposed on the horizontal velocity field (in s).
dt_dopr	R	output	R	value of dt_data_output	Temporal interval at which data of vertical profiles shall be output (to local file DATA_1D_PR_NETCDF (in s).
dt_dopr_listing	R	output	R	9999999.9	Temporal interval at which data of vertical profiles shall be output (output for printouts, local file LIST_PROFIL) (in s).
dt_dopts	P	output	R	value of dt_data_output	Temporal interval at which time series data of particle quantities shall be output (in s).
dt_dosp	P	output	R	value of dt_data_output	Temporal interval at which spectra data shall be output (in s).
dt_dots	R	output	R	see parameter description	Temporal interval at which time series data shall be output (in s).
dt_do2d_xy	R	output	R	value of dt_data_output	Temporal interval at which horizontal cross section data shall be output (in s).
dt_do2d_xz	R	output	R	value of dt_data_output	Temporal interval at which vertical cross section data (xz) shall be output (in s).
dt_do2d_yz	R	output	R	value of dt_data_output	Temporal interval at which vertical cross section data (yz) shall be output (in s).
dt_do3d	R	output	R	value of dt_data_output	Temporal interval at which 3d volume data shall be output (in s).
dt_dvr	P	dvr	R	9999999.9	Temporal interval of scenes to be displayed with the dvrp software (in s).
dt_max	R	run steering	R	20.0	Maximum allowed value of the timestep (in s).
dt_min_part	P	particles	R	0.0002	Minimum value for the particle timestep when SGS velocities are used (in s).
dt_prel	P	particles	R	9999999.9	Temporal interval at which particles are to be released from a particle source (in s).
dt_pr_1d	I	ini	R	9999999.9	Temporal interval of vertical profile output of the 1D-model (in s).
dt_restart	R	run steering	R	9999999.9	Temporal interval at which a new restart run is to be carried out (in s).
dt_run_control	R	output	R	60.0	Temporal interval at which run control output is to be made (in s).
dt_run_control_1d	I	ini	R	60.0	Temporal interval of runtime control output of the 1d-model (in s).
dt_sort_particles	P	particles	R	0.0	Temporal interval for sorting particles (in s). Not available from release 4.0 on.
dt_write_particle _data	P	particles	R	9999999.9	Temporal interval for output of particle data (in s).
dvrp_directory	P	dvr	C*80	'default'	Name of the directory into which data created by the dvrp software shall be saved.
dvrp_file	P	dvr	C*80	'default'	Name of the file into which data created by the dvrp software shall be output.
dvrp_host	P	dvr	C*80	'origin.rvs. uni-hannover.de'	Name of the computer to which data created by the dvrp software shall be transferred.
dvrp_output	P	dvr	C*10	'rtsp'	Output mode for the dvrp software.
dvrp_password	P	dvr	C*80	''	Password for the computer to which data created by the dvrp software is to be transferred.
dvrp_psize	P	dvr	R	0.2*dx	Diameter that the particles is given in visualizations with the dvrp software (in m).
dvrpsize_interval	P	dvr	R(2)	0.0, 1.0	Interval of values used for determining the particle size displayed in the animation.
dvrp_username	P	dvr	C*80	no default value	User name of a valid account on the computer to which data created by the dvrp software is to be transferred.
dx	I	grid	R	1.0	Horizontal grid spacing along the x-direction (in m).
dy	I	grid	R	1.0	Horizontal grid spacing along the y-direction (in m).
dz	I	grid	R	no default value, see parameter description	Vertical grid spacing (in m).
dz_max	I	grid	R	9999999.9	Allowed maximum vertical grid spacing (in m).
dz_stretch_factor	I	grid	R	1.08	Stretch factor for a vertically stretched grid (see dz_stretch_level).
dz_stretch_level	I	grid	R	100000.0	Height level above/below which the grid is to be stretched vertically (in m).
e_init	I	mode	R	0.0	Initial TKE in m2s-2.
e_min	I	mode	R	0.0	Minimum TKE in m2s-2.
end_time	R	run steering	R	0.0	Simulation time of the 3D model (in s).
end_time_prel	P	particles	R	9999999.9	Time of the last release of particles (in s).
end_time_1d	I	ini	R	864000.0	Time to be simulated for the 1D-model (in s).
fft_method	I	num	C*20	'system specific'	FFT-method to be used.
force_print_header	R	output	L	.F.	Steering of header output to the local file RUN_CONTROL.
galilei_transformation	I	mode	L	.F.	Application of a Galilei-transformation to the coordinate system of the model.
groundplate_color	P	dvr	R(3)	0.0, 0.6, 0.0	Color of the ground plate.
humidity	I	mode	L	.F.	Parameter to switch on the prognostic equation for specific humidity q.
inflow_damping_height	I	bc	R	from precursor run	Height below which the turbulence signal is used for turbulence recycling (in m).
inflow_damping_width	I	bc	R	0.1* inflow_damping_height	Transition range within which the turbulance signal is damped to zero (in m).
inflow_disturbance _begin	I	bc	I	MIN(10, nx/2 or ny/2)	Lower limit of the horizontal range for which random perturbations are to be imposed on the horizontal velocity field (gridpoints).
inflow_disturbance _end	I	bc	I	MIN(100, 3/4*nx or 3/4*ny)	Upper limit of the horizontal range for which random perturbations are to be imposed on the horizontal velocity field (gridpoints).
initializing_actions	I	ini	C*100	no default value, see parameter description	Initialization actions to be carried out.
initial_weighting _factor	P	particles	R	1.0	Factor to define the real number of initial droplets in a grid cell.
isosurface_color	P	dvr	R(3,10)	0.9, 0.9, 0.9 0.8, 0.1, 0.1 ...	Color of the isosurface(s).
km_constant	I	mode	R	variable (computed from TKE)	Constant eddy diffusivities are used (laminar simulations).
km_damp_max	I	mode	R	0.5*(dx or dy)	Maximum diffusivity used for filtering the velocity field in the vicinity of the outflow (in m2/s).
lad_surface	I	canopy	R	0.0	Surface value of the leaf area density (in m2/m3). Parameter moved to NAMELIST canopy_par starting at rev. 1485.
lad_vertical_gradient	I	canopy	R(10)	10*0.0	Gradient(s) of the leaf area density (in m2/m4). Parameter moved to NAMELIST canopy_par starting at rev. 1485.
lad_vertical_gradient _level	I	canopy	R(10)	10*0.0	Height level from which on the gradient of the leaf area density defined by lad_vertical_gradient is effective (in m). Parameter moved to NAMELIST canopy_par starting at rev. 1485.
lai_beta	C	canopy	R	0.0	Leaf area index needed for construction of leaf area density profile.
large_scale_forcing	I	mode	L	.F.	Parameter to switch on the use of large scale forcing information from an external file.
large_scale_subsidence	I	mode	L	.F.	Parameter to switch on the use of large scale subsidence/ascent.
leaf_scalar_exch_coeff	C	canopy	R	0.0	Scalar exchange coefficient for a leaf (dimensionless).
leaf_surface_conc	C	canopy	R	0.0	Concentration of a passive scalar at the surface of a leaf (in kg/m3).
leaf_surface_concentration	I	canopy	R	0.0	Concentration of a passive scalar at the surface of a leaf (in kg/m3). Parameter renamed leaf_surface_conc starting at rev. 1485, and moved to NAMELIST canopy_par.
limiter_sedimentation	I	cloud physics	L	.T.	Use limiter in rain drop sedimentation process.
loop_optimization	I	num	C*16	see parameter description	Method used to optimize loops for solving the prognostic equations.
masking_method	I	num	L	.F.	Switch for topography boundary conditions in multigrid solver.
maximum_number _of_particles	P	particles	I	1000	Maximum number of particles (on a PE). Not available from release 4.0 on.
maximum_number _of_tailpoints	P	particles	I	100	Maximum number of tailpoints that a particle tail can have.
maximum_tailpoint _age	P	particles	R	100000.0	Maximum age that the end point of a particle tail is allowed to have (in s).
mg_cycles	I	num	I	-1	Number of cycles to be used with the multi-grid scheme.
mg_switch_to _pe0_level	R	num	I	see parameter description	Grid level at which data shall be gathered on PE0.
minimum_tailpoint _distance	P	particles	R	0.0	Minimum distance allowed between two adjacent points of a particle tail (in m).
min_nr_particles	P	particles	I	50	Minimum number of particles for which memory is allocated at every grid cell.
mixing_length_1d	I	ini	C*20	'as_in_3d_model'	Mixing length used in the 1d-model.
mode_dvrp	P	dvr	C*20(10)	10*' '	Graphical objects (isosurfaces, slicers, particles) which are to be created by the dvrp software.
momentum_advec	I	num	C*10	'pw-scheme'	Advection scheme to be used for the momentum equations.
nc_const	I	cloud physics	R	70.0E6	Cloud droplet number density (in m-3).
netcdf_data_format	R	output	I	2	Data format for netCDF files.
netcdf_precision	I	output	C*20(10)	single precision for all output quantities	Defines the accuracy of the netCDF output.
neutral	I	mode	L	.F.	Parameter to switch off calculation of temperature equation.
ngsrb	R	num	I	2	Number of Gauss-Seidel iterations to be carried out on each grid level of the multigrid Poisson solver.
normalizing_region	R	output	I	0	Determines the subdomain from which the normalization quantities are calculated.
npex	R	grid	I	no default value, see parameter description	Number of processors along x-direction of the virtual processor net.
npey	R	grid	I	no default value, see parameter description	Number of processors along y-direction of the virtual processor net.
nsor	R	num	I	20	Number of iterations to be used with the SOR-scheme.
nsor_ini	I	num	I	100	Initial number of iterations with the SOR algorithm.
nudging	I	mode	L	.F.	Parameter to switch on nudging with data from larger scale models or from measurements.
number_of _particle_groups	P	particles	I	1	Number of particle groups to be used.
nx	I	grid	I	no default value, see parameter description	Number of grid points in x-direction.
ny	I	grid	I	no default value, see parameter description	Number of grid points in y-direction.
nz	I	grid	I	no default value, see parameter description	Number of grid points in z-direction.
nz_do3d	I	grid	I	nz + 1	Limits the output of 3d volume data along the vertical direction (grid point index k).
ocean	I	mode	L	.F.	Parameter to switch on ocean runs.
omega	I	phys	R	7.29212E-5	Angular velocity of the rotating system (in rad s-1).
omega_sor	I	num	R	1.8	Convergence factor to be used with the SOR-scheme.
outflow_damping _width	I	bc	I	MIN(20, nx/2 or ny/2)	Width of the damping range in the vicinity of the outflow (gridpoints).
particles_per_point	P	particles	I	1	Number of particles to be started per point.
particle_advection _start	P	particles	R	0.0	Time of the first release of particles (in s).
particle_color	P	particles	C*10	'none'	Parameter, which allows to bind the displayed particle color to certain flow quantities.
particle_dvrpsize	P	particles	C*10	'none'	Parameter, which allows to bind the displayed particle size to certain flow quantities.
particle_maximum _age	P	particles	R	9999999.9	Maximum allowed age of particles (in s).
passive_scalar	I	mode	L	.F.	Parameter to switch on the prognostic equation for a passive scalar.
pch_index	I	canopy	I	0	Grid point index (w-grid) of the upper boundary of the plant canopy layer. Parameter moved to NAMELIST canopy_par starting at rev. 1485.
pdx	P	particles	R(10)	10*dx	Distance along x between particles within a particle source (in m).
pdy	P	particles	R(10)	10*dy	Distance along y between particles within a particle source (in m).
pdz	P	particles	R(10)	10*(zu(2) - zu(1))	Distance along z between particles within a particle source (in m).
phi	I	phys	R	55.0	Geographical latitude (in degrees).
plant_canopy	I	canopy	L	.F.	Parameter to switch on the plant canopy model.
plot_spectra_level	P	output	I(100)	No level	Vertical level(s) for which horizontal spectra are to be plotted (in gridpoints).
prandtl_layer	I	bc	L	.T.	Parameter to switch on a Prandtl layer.
prandtl_number	I	phys	R	1.0	Ratio of the eddy diffusivities for momentum and heat (Km/Kh).
precipitation	I	mode	L	.F.	Parameter to switch on the precipitation scheme.
precipitation_amount _interval	R	output	R	value of dt_do2d_xy	Temporal interval for which the precipitation amount (in mm) shall be calculated and output (in s).
profile_columns	R	output	I	3	Number of coordinate systems to be plotted in one row by plot software palmplot.
profile_rows	R	output	I	2	Number of rows of coordinate systems to be plotted on one page by plot software palmplot.
psb	P	particles	R(10)	10*zu(nz/2)	Bottom edge of a particle source (in m).
psl	P	particles	R(10)	10*0.0	Left edge of a particle source (in m).
psn	P	particles	R(10)	10*(ny*dy)	Rear ("north") edge of a particle source (in m).
psolver	I	num	C*10	'poisfft'	Scheme to be used to solve the Poisson equation for the perturbation pressure.
psr	P	particles	R(10)	10*(nx*dx)	Right edge of a particle source (in m).
pss	P	particles	R(10)	10*0.0	Front ("south") edge of a particle source (in m).
pst	P	particles	R(10)	10*zu(nz/2)	Top edge of a particle source (in m).
pt_damping_factor	I	num	R	0.0	Factor for damping the potential temperature.
pt_damping_width	I	num	R	0.0	Width of the damping domain of the potential temperature (in m).
pt_reference	I	mode	R	value of pt_surface	Reference temperature to be used in the buoyancy term (in K).
pt_surface	I	ini	R	300.0	Surface potential temperature (in K).
pt_surface_initial _change	I	ini	R	0.0	Change in surface temperature to be made at the beginning of the 3d run (in K).
pt_vertical_gradient	I	ini	R(10)	10*0.0	Temperature gradient(s) of the initial temperature profile (in K / 100 m).
pt_vertical_gradient _level	I	ini	R(10)	10*0.0	Height level from which on the temperature gradient defined by pt_vertical_gradient is effective (in m).
q_surface	I	ini	R	0.0	Surface specific humidity / total water content (kg/kg).
q_surface_initial _change	I	ini	R	0.0	Change in surface specific humidity / total water content to be made at the beginning of the 3d run (kg/kg).
q_vertical_gradient	I	ini	R(10)	10*0.0	Humidity gradient(s) of the initial humidity profile (in 1/100 m).
q_vertical_gradient _level	I	ini	R(10)	10*0.0	Height level from which on the humidity gradient defined by q_vertical_gradient is effective (in m).
radiation	I	mode	L	.F.	Parameter to switch on longwave radiation cooling at cloud-tops.
radius	P	particles	R(10)	0.0, 9* 9999999.9	Particle radius (in m).
radius_classes	P	particles	I	20	Number of radius classes to be used in the collision efficiency table.
random_generator	I	num	C*20	'numerical recipes'	Random number generator to be used for creating uniformly distributed random numbers.
random_heatflux	I	mode	L	.F.	Parameter to impose random perturbations on the internal two-dimensional near surface heat flux field shf.
random_start_position	P	particles	L	.F.	Initial position of the particles is varied randomly within certain limits.
rayleigh_damping _factor	R	num	R	0.0 and/or 0.01 (see parameter description)	Factor for Rayleigh damping.
rayleigh_damping _height	R	num	R	2/3*zu(nz)	Height where the Rayleigh damping starts (in m).
read_particles_from _restartfile	P	particles	L	.T.	Read particle data from the previous run.
recycling_width	I	bc	R	0.1*nx*dx	Distance of the recycling plane from the inflow boundary (in m).
reference_state	I	mode	C*20	'initial_profile'	Defines what is used as reference state in the buoyancy term.
region	U	output	C*40(0:9)		Name(s) of the subdomain(s) defined by the user.
residual_limit	I	num	R	1.0E-6	Largest residual permitted for the multi-grid scheme (in s-2m-3).
restart_time	R	run steering	R	9999999.9	Simulated time after which a restart run is to be carried out (in s).
rif_max	I	bc	R	1.0	Upper limit of the flux-Richardson number.
rif_min	I	bc	R	-5.0	Lower limit of the flux-Richardson number.
roughness_length	I	bc	R	0.1	Roughness length (in m).
sa_surface	I	ini	R	35.0	Surface salinity (in psu).
sa_vertical_gradient	I	bc	R(10)	10*0.0	Salinity gradient(s) of the initial salinity profile (in psu / 100 m).
sa_vertical_gradient _level	I	bc	R(10)	10*0.0	Height level from which on the salinity gradient defined by sa_vertical_gradient is effective (in m).
scalar_advec	I	num	C*10	'pw-scheme'	Advection scheme to be used for the scalar quantities.
scalar_exchange_coefficient	I	canopy	R	0.0	Scalar exchange coefficient for a leaf (dimensionless). Parameter renamed leaf_scalar_exch_coeff starting at rev. 1485, and moved to NAMELIST canopy_par.
scalar_rayleigh _damping	I	num	L	.T.	Application of Rayleigh damping to scalars.
section_xy	R	output	I(100)	no section	Position of cross section(s) for output of 2d horizontal cross sections (grid point index k).
section_xz	R	output	I(100)	no section	Position of cross section(s) for output of 2d (xz) vertical cross sections (grid point index j).
section_yz	R	output	I(100)	no section	Position of cross section(s) for output of 2d (yz) vertical cross sections (grid point index i).
skip_particles_for_tail	P	particles	I	100	Limit the number of particle tails.
skip_time_data_output	R	output	R	0.0	No data output before this interval has passed (in s).
skip_time_data _output_av	R	output	R	value of skip_time _data_output	No output of temporally averaged 2d/3d data before this interval has passed (in s).
skip_time_dopr	R	output	R	value of skip_time _data_output	No output of vertical profile data before this interval has passed (in s).
skip_time_dosp	P	output	R	value of skip_time _data_output	No output of spectra data before this interval has passed (in s).
skip_time_do2d_xy	R	output	R	value of skip_time _data_output	No output of instantaneous horizontal cross section data before this interval has passed (in s).
skip_time_do2d_xz	R	output	R	value of skip_time _data_output	No output of instantaneous vertical (xz) cross section data before this interval has passed (in s).
skip_time_do2d_yz	R	output	R	value of skip_time _data_output	No output of instantaneous vertical (yz) cross section data before this interval has passed (in s).
skip_time_do3d	R	output	R	value of skip_time _data_output	No output of instantaneous 3d volume data before this interval has passed (in s).
slicer_range _limits_dvrp	P	dvr	R(2,10)	10*(-1,1)	Ranges of values to which a color table has to be mapped (units of the respective quantity).
spectra_direction	P	output	C*2(10)	10*' '	Direction(s) along which spectra are to be calculated.
statistic_regions	I	output	I	0	Number of additional user-defined subdomains for which statistical analysis and corresponding output (profiles, time series) shall be made.
subs_vertical_gradient	I	mode	R(10)	10*0.0	Gradient(s) of the profile for the large scale subsidence/ascent velocity in ((m/s) / 100 m).
subs_vertical_gradient _level	I	mode	R(10)	10*0.0	Height level from which on the gradient for the subsidence/ascent velocity defined by subs_vertical_gradient is effective (in m).
superelevation	P	dvr	R	1.0	Superelevation factor for the vertical coordinate.
superelevation_x	P	dvr	R	1.0	Superelevation factor for the horizontal (x) coordinate.
superelevation_y	P	dvr	R	1.0	Superelevation factor for the horizontal (y) coordinate.
surface_heatflux	I	bc	R	no prescribed heatflux	Kinematic sensible heat flux at the bottom surface (in K m/s).
surface_pressure	I	ini	R	1013.25	Atmospheric pressure at the surface (in hPa).
surface_scalarflux	I	bc	R	0.0	Scalar flux at the surface (in kg/(m2s)).
surface_waterflux	I	bc	R	0.0	Kinematic water flux near the surface (in m/s).
synchronous_exchange	R	MPI	L	.F.	Defines how MPI handles the exchange of ghost points.
s_surface	I	ini	R	0.0	Surface value of the passive scalar (in kg/m3).
s_surface_initial _change	I	ini	R	0.0	Change in surface scalar concentration to be made at the beginning of the 3d run (in kg/m3).
s_vertical_gradient	I	ini	R(10)	10*0.0	Scalar concentration gradient(s) of the initial scalar concentration profile (in kg/m3 / 100 m).
s_vertical_gradient _level	I	ini	R(10)	10*0.0	Height level from which on the scalar gradient defined by s_vertical_gradient is effective (in m).
termination_time _needed	R	run steering	R	35.0	CPU time needed for terminal actions at the end of a run in batch mode (in s).
threshold	P	dvr	R(10)	0.0	Threshold value for which an isosurface is to be created by the dvrp software.
timestep_scheme	I	num	C*20	'runge-kutta-3'	Time step scheme to be used for integration of the prognostic variables.
topography	I	topo	C*40	'flat'	Topography mode.
topography_color	P	dvr	R(3)	0.8, 0.7, 0.6	Color of the topography.
topography_grid _convention	I	topo	C*11	default depends on value of topography	Convention for defining the topography grid.
top_heatflux	I	bc	R	no prescribed heatflux	Kinematic sensible heat flux at the top surface (in K m/s).
top_momentumflux_u	I	bc	R	no prescribed momentumflux	Momentum flux along x at the top boundary (in m2/s2).
top_momentumflux_v	I	bc	R	no prescribed momentumflux	Momentum flux along y at the top boundary (in m2/s2).
top_salinityflux	I	bc	R	no prescribed salinityflux	Kinematic salinity flux at the top boundary, i.e. the sea surface (in psu m/s).
transpose_compute _overlap	I	num	L	.F.	Parameter to switch on parallel execution of fft and transpositions (with MPI_ALLTOALL).
turbulence	I	cloud physics	L	.F.	Parameterize turbulence effects on autoconversion and accretion of cloud droplets.
turbulent_inflow	I	bc	L	.F.	Generates a turbulent inflow at side boundaries using a turbulence recycling method.
u_bulk	I	mode	R	0.0	u-component of the predefined bulk velocity (in m/s).
u_profile	I	ini	R(100)	100 * 9999999.9	Values of u-velocity component to be used as initial profile (in m/s).
ug_surface	I	ini	R	0.0	u-component of the geostrophic wind at the surface (in m/s).
ug_vertical_gradient	I	ini	R(10)	10*0.0	Gradient(s) of the initial profile of the u-component of the geostrophic wind (in 1/100s).
ug_vertical_gradient _level	I	ini	R(10)	10*0.0	Height level from which on the gradient defined by ug_vertical_gradient is effective (in m).
uv_heights	I	ini	R(100)	100 * 9999999.9	Height levels for prescribed u,v-profiles (in m).
use_cmax	I	bc	L	.T.	Parameter to choose calculation method of the phase velocity in case of radiation boundary conditions.
use_particle_tails	P	particles	L	.F.	Give particles a tail.
use_sgs_for_particles	P	particles	L	.F.	Use subgrid-scale velocities for particle advection.
use_subsidence_tendencies	I	mode	L	.F.	Parameter to choose the calculation method of subsidence in case of runs with large scale forcing.
use_surface_fluxes	I	bc	L	.F.	Parameter to steer the treatment of the subgrid-scale vertical fluxes within the diffusion terms at k=1 (bottom boundary).
use_top_fluxes	I	bc	L	.F.	Parameter to steer the treatment of the subgrid-scale vertical fluxes within the diffusion terms at k=nz (top boundary).
use_ug_for_galilei_tr	I	mode	L	.T.	Switch to determine the translation velocity in case that a Galilean transformation is used.
use_upstream _for_tke	I	num	L	.F.	Parameter to choose the advection/timestep scheme to be used for the subgrid-scale TKE.
vertical_particle _advection	P	particles	L	.T.	Switch on/off vertical particle transport.
v_bulk	I	mode	R	0.0	v-component of the predefined bulk velocity (in m/s).
v_profile	I	ini	R(100)	100 * 9999999.9	Values of v-velocity component to be used as initial profile (in m/s).
ventilation_effect	I	cloud physics	L	.F.	Parameterize ventilation effect on evaporation of rain drops.
vg_surface	I	ini	R	0.0	v-component of the geostrophic wind at the surface (in m/s).
vg_vertical_gradient	I	ini	R(10)	10*0.0	Gradient(s) of the initial profile of the v-component of the geostrophic wind (in 1/100s).
vg_vertical_gradient _level	I	ini	R(10)	10*0.0	Height level from which on the gradient defined by vg_vertical_gradient is effective (in m).
wall_adjustment	I	bc	L	.T.	Parameter to restrict the mixing length in the vicinity of the bottom boundary (and near vertical walls of a non-flat topography).
wall_heatflux	I	topo	R(5)	5*0.0	Prescribed kinematic sensible heat flux in K m/s at the five topography faces.
wall_humidityflux	I	topo	R(5)	5*0.0	Prescribed kinematic humidtiy flux in m/s at the five topography faces.
wall_scalarflux	I	topo	R(5)	5*0.0	Prescribed scalar flux in kg/(m2 s) at the five topography faces.
write_particle _statistics	P	particles	L	.F.	Switch on/off output of particle information.
z0h_factor	I	bc	R	1.0	Factor for calculating the roughness length for scalars.