The default configuration namelist file is config_default.nml.

Fields in bold (with NA as default values) must be edited before running S3COM.

Parameter Name	Description	Default
path_s3com	Path to the main S3COM repository	NA
path_out	Path for output files	"./"
suffix_out	suffix to be used in output files	""
fname_in	Input file name	NA
flag_retrievals	Turn on cloud retrievals	FALSE
flag_output_atm	Output atmospheric variables (S3COM_atm.nc)	FALSE
flag_output_jac	Output Jacobian variables (S3COM_jac.nc)	FALSE
flag_output_k_tl	Output Jacobian Tangeant Linear variables (depricated)	FALSE
npoints_it	Number of simultaneous data points sent to RTTOV	100
nchannels	Number of satellite channels	2
model_name	Name of the physical model to be used as input (currently: ICON, NWPSAF)	"ICON"

Check the RTTOV website for the list of selected instruments and channel specifications. Default is MODIS/Aqua.

Parameter Name	Description	Default
platform	Platform ID	9
satellite	Satellite ID	2
instrument	Instrument ID	13
channel_list	List of channels to simulate (disabled if channel_seq is not 0)	1, 2
channel_seq	Sequence of channels to simulate (first and last values)	0, 0

See the RTTOV general documentation for more details on some of these parameters.

Parameter Name	Description	Default
path_rttov	Path to RTTOV	NA
do_jacobian_calc	Do Jacobian calculations when retrievals aren't included	FALSE
do_opdep_calc	Include gaseous absorption	TRUE
ir_scatt_model	Infrared scattering model (1: DOM, 2: Chou-scaling)	1
vis_scatt_model	Visible scattering model (1: DOM, 2: Single-scattering, 3: MFASIS)	1
dom_nstreams	Number of streams used in DOM	8
dom_nmom	Number of Legendre polynomial moments used in DOM	128
dom_rayleigh	Activate Rayleigh multiple scattering	TRUE
rttov_nthreads	Number of threads in RTTOV (MPI required)	1
user_cld_opt_param	User-defined cloud properties (deactivates ice_scheme and clw_scheme)	FALSE
ice_scheme	1: Baum, 2: Baran 2014, 3: Baran 2018	3
clw_scheme	1: OPAC, 2: Deff	2
mmr_cldaer	cloud / aerosol units. true: kg/kg (cld+aer); false: g.m-3 (cld), cm-3 (aer)	FALSE
ozone_data	Origin of ozone data. True: user input, False: RTTOV database	FALSE
add_aerosols	Include aerosols	FALSE
add_clouds	Include clouds	TRUE
add_refrac	Include atmospheric refraction	TRUE