GFS Rayleigh Damping Module

This is the Rayleigh friction calculation with total energy conservation. More...

Detailed Description

Role of Rayleigh friction, it attempts to resolve two issues:

• The top lid model effects, sponge layer to suppress resolved wave reflections and extra-heating
• The winter-summer zonal wind drag in the strato-mesosphere

Argument Table

local_name	standard_name	long_name	units	type	dimensions	kind	intent	optional
lsidea	flag_idealized_physics	flag for idealized physics	flag	logical	()		in	False
im	horizontal_loop_extent	horizontal loop extent	count	integer	()		in	False
km	vertical_dimension	number of vertical layers	count	integer	()		in	False
A	tendency_of_y_wind_due_to_model_physics	meridional wind tendency due to model physics	m s-2	real	(horizontal_dimension, vertical_dimension)	kind_phys	inout	False
B	tendency_of_x_wind_due_to_model_physics	zonal wind tendency due to model physics	m s-2	real	(horizontal_dimension, vertical_dimension)	kind_phys	inout	False
C	tendency_of_air_temperature_due_to_model_physics	air temperature tendency due to model physics	K s-1	real	(horizontal_dimension, vertical_dimension)	kind_phys	inout	False
u1	x_wind	zonal wind	m s-1	real	(horizontal_dimension, vertical_dimension)	kind_phys	in	False
v1	y_wind	meridional wind	m s-1	real	(horizontal_dimension, vertical_dimension)	kind_phys	in	False
dt	time_step_for_physics	physics time step	s	real	()	kind_phys	in	False
cp	specific_heat_of_dry_air_at_constant_pressure	specific heat of dry air at constant pressure	J kg-1 K-1	real	()	kind_phys	in	False
levr	number_of_vertical_layers_for_radiation_calculations	number of vertical layers for radiation calculations	count	integer	()		in	False
pgr	surface_air_pressure	surface pressure	Pa	real	(horizontal_dimension)	kind_phys	in	False
prsl	air_pressure	mid-layer pressure	Pa	real	(horizontal_dimension, vertical_dimension)	kind_phys	in	False
prslrd0	pressure_cutoff_for_rayleigh_damping	pressure level above which to apply Rayleigh damping	Pa	real	()	kind_phys	in	False
ral_ts	time_scale_for_rayleigh_damping	time scale for Rayleigh damping	d	real	()	kind_phys	in	False
ldiag3d	flag_diagnostics_3D	flag for calculating 3-D diagnostic fields	flag	logical	()		in	False
du3dt	cumulative_change_in_x_wind_due_to_rayleigh_damping	cumulative change in zonal wind due to Rayleigh damping	m s-1	real	(horizontal_dimension, vertical_dimension)	kind_phys	inout	False
dv3dt	cumulative_change_in_y_wind_due_to_rayleigh_damping	cumulative change in meridional wind due to Rayleigh damping	m s-1	real	(horizontal_dimension, vertical_dimension)	kind_phys	inout	False
dt3dt	cumulative_change_in_temperature_due_to_rayleigh_damping	cumulative change in temperature due to Rayleigh damping	K	real	(horizontal_dimension, vertical_dimension)	kind_phys	inout	False
errmsg	ccpp_error_message	error message for error handling in CCPP	none	character	()	len=*	out	False
errflg	ccpp_error_flag	error flag for error handling in CCPP	flag	integer	()		out	False

GFS rayleigh_damp_runGeneral Algorithm

Functions/Subroutines
subroutine	rayleigh_damp::rayleigh_damp_run ( lsidea, IM, KM, A, B, C, U1, V1, DT, CP, LEVR, pgr, PRSL, PRSLRD0, ral_ts, ldiag3d, du3dt, dv3dt, dt3dt, errmsg, errflg)