GFS radlw Main

This module includes NCEP's modifications of the RRTMG-LW radiation code from AER. More...

Detailed Description

The RRTM-LW package includes three files:

• radlw_param.f, which contains:
  • module_radlw_parameters: band parameters set up
• radlw_datatb.f, which contains modules:
  • module_radlw_avplank: plank flux data
  • module_radlw_ref: reference temperature and pressure
  • module_radlw_cldprlw: cloud property coefficients
  • module_radlw_kgbnn: absorption coeffients for 16 bands, where nn = 01-16
• radlw_main.f, which contains:
  • rrtmg_lw_run(): the main LW radiation routine
  • rlwinit(): the initialization routine

Version

NCEP LW v5.1 Nov 2012 -RRTMG-LW v4.82

Copyright

2002-2007, Atmospheric & Environmental Research, Inc. (AER). This software may be used, copied, or redistributed as long as it is not sold and this copyright notice is reproduced on each copy made. This model is provided as is without any express or implied warranties. (http://www.rtweb.aer.com/)

Argument Table

local_name	standard_name	long_name	units	rank	type	kind	intent	optional
plyr	air_pressure_at_layer_for_radiation_in_hPa	air pressure layer	hPa	2	real	kind_phys	in	F
plvl	air_pressure_at_interface_for_radiation_in_hPa	air pressure level	hPa	2	real	kind_phys	in	F
tlyr	air_temperature_at_layer_for_radiation	air temperature layer	K	2	real	kind_phys	in	F
tlvl	air_temperature_at_interface_for_radiation	air temperature level	K	2	real	kind_phys	in	F
qlyr	water_vapor_specific_humidity_at_layer_for_radiation	specific humidity layer	kg kg-1	2	real	kind_phys	in	F
olyr	ozone_concentration_at_layer_for_radiation	ozone concentration layer	kg kg-1	2	real	kind_phys	in	F
gasvmr_co2	volume_mixing_ratio_co2	volume mixing ratio co2	kg kg-1	2	real	kind_phys	in	F
gasvmr_n2o	volume_mixing_ratio_n2o	volume mixing ratio no2	kg kg-1	2	real	kind_phys	in	F
gasvmr_ch4	volume_mixing_ratio_ch4	volume mixing ratio ch4	kg kg-1	2	real	kind_phys	in	F
gasvmr_o2	volume_mixing_ratio_o2	volume mixing ratio o2	kg kg-1	2	real	kind_phys	in	F
gasvmr_co	volume_mixing_ratio_co	volume mixing ratio co	kg kg-1	2	real	kind_phys	in	F
gasvmr_cfc11	volume_mixing_ratio_cfc11	volume mixing ratio cfc11	kg kg-1	2	real	kind_phys	in	F
gasvmr_cfc12	volume_mixing_ratio_cfc12	volume mixing ratio cfc12	kg kg-1	2	real	kind_phys	in	F
gasvmr_cfc22	volume_mixing_ratio_cfc22	volume mixing ratio cfc22	kg kg-1	2	real	kind_phys	in	F
gasvmr_ccl4	volume_mixing_ratio_ccl4	volume mixing ratio ccl4	kg kg-1	2	real	kind_phys	in	F
icseed	seed_random_numbers_lw	seed for random number generation for longwave radiation	none	1	integer		in	F
aeraod	aerosol_optical_depth_for_longwave_bands_01-16	aerosol optical depth for longwave bands 01-16	none	3	real	kind_phys	in	F
aerssa	aerosol_single_scattering_albedo_for_longwave_bands_01-16	aerosol single scattering albedo for longwave bands 01-16	frac	3	real	kind_phys	in	F
sfemis	surface_longwave_emissivity	surface emissivity	frac	1	real	kind_phys	in	F
sfgtmp	surface_ground_temperature_for_radiation	surface ground temperature for radiation	K	1	real	kind_phys	in	F
npts	horizontal_loop_extent	horizontal dimension	count	0	integer		in	F
nlay	adjusted_vertical_layer_dimension_for_radiation	number of vertical layers for radiation	count	0	integer		in	F
nlp1	adjusted_vertical_level_dimension_for_radiation	number of vertical levels for radiation	count	0	integer		in	F
lprnt	flag_print	flag to print	flag	0	logical		in	F
cld_cf	total_cloud_fraction	total cloud fraction	frac	2	real	kind_phys	in	F
lslwr	flag_to_calc_lw	flag to calculate LW irradiances	flag	0	logical		in	F
hlwc	tendency_of_air_temperature_due_to_longwave_heating_on_radiation_time_step	longwave total sky heating rate	K s-1	2	real	kind_phys	inout	F
topflx	lw_fluxes_top_atmosphere	longwave total sky fluxes at the top of the atm	W m-2	1	topflw_type		inout	F
sfcflx	lw_fluxes_sfc	longwave total sky fluxes at the Earth surface	W m-2	1	sfcflw_type		inout	F
hlw0	tendency_of_air_temperature_due_to_longwave_heating_assuming_clear_sky_on_radiation_time_step	longwave clear sky heating rate	K s-1	2	real	kind_phys	inout	T
hlwb	lw_heating_rate_spectral	longwave total sky heating rate (spectral)	K s-1	3	real	kind_phys	inout	T
flxprf	lw_fluxes	lw fluxes total sky / csk and up / down at levels	W m-2	2	proflw_type		inout	T
cld_lwp	cloud_liquid_water_path	cloud liquid water path	g m-2	2	real	kind_phys	in	T
cld_ref_liq	mean_effective_radius_for_liquid_cloud	mean effective radius for liquid cloud	micron	2	real	kind_phys	in	T
cld_iwp	cloud_ice_water_path	cloud ice water path	g m-2	2	real	kind_phys	in	T
cld_ref_ice	mean_effective_radius_for_ice_cloud	mean effective radius for ice cloud	micron	2	real	kind_phys	in	T
cld_rwp	cloud_rain_water_path	cloud ice water path	g m-2	2	real	kind_phys	in	T
cld_ref_rain	mean_effective_radius_for_rain_drop	mean effective radius for rain drop	micron	2	real	kind_phys	in	T
cld_swp	cloud_snow_water_path	cloud snow water path	g m-2	2	real	kind_phys	in	T
cld_ref_snow	mean_effective_radius_for_snow_flake	mean effective radius for snow flake	micron	2	real	kind_phys	in	T
cld_od	cloud_optical_depth	cloud optical depth	none	2	real	kind_phys	in	T
errmsg	error_message	error message for error handling in CCPP	none	0	character	len=*	out	F
errflg	error_flag	error flag for error handling in CCPP	flag	0	integer		out	F

RRTMG Longwave Radiation Scheme General Algorithm

Modules
module	module_radlw_parameters
	This module contains LW band parameters set up.
module	module_radlw_avplank
	This module contains plank flux data.
module	module_radlw_ref
	This module contains reference temperature and pressure.
module	module_radlw_cldprlw
	This module contains cloud property coefficients.
module	module_radlw_kgb01
	This module sets up absorption coefficients for band 01: 10-250 cm-1 (low - h2o; high - h2o)
module	module_radlw_kgb02
	This module sets up absorption coefficients for band 02: 250-500 cm-1 (low - h2o; high - h2o)
module	module_radlw_kgb03
	This module sets up absorption coefficients for band 03: 500-630 cm-1 (low - h2o, co2; high - h2o, co2)
module	module_radlw_kgb04
	This module sets up absorption coefficients for band 04: 630-700 cm-1 (low - h2o, co2; high - co2, o3)
module	module_radlw_kgb05
	This module sets up absorption coefficients for band 05: 700-820 cm-1 (low - h2o, co2; high - co2, o3)
module	module_radlw_kgb06
	This module sets up absorption coefficients for band 06: 820-980 cm-1 (low - h2o; high - /)
module	module_radlw_kgb07
	This module sets up absorption coefficients for band 07: 980-1080 cm-1 (low - h2o, o3; high - o3)
module	module_radlw_kgb08
	This module sets up absorption coefficients for band 08: 1080-1180 cm-1 (low - h2o; high - o3)
module	module_radlw_kgb09
	This module sets up absorption coefficients for band 09: 1180-1390 cm-1 (low - h2o, ch4; high - ch4)
module	module_radlw_kgb10
	This module sets up absorption coefficients for band 10: 1390-1480 cm-1 (low - h2o; high - h2o)
module	module_radlw_kgb11
	This module sets up absorption coefficients for band 11: 1480-1800 cm-1 (low - h2o; high - h2o)
module	module_radlw_kgb12
	This module sets up absorption coefficients for band 12: 1800-2080 cm-1 (low - h2o, co2; high - /)
module	module_radlw_kgb13
	This module sets up absorption coefficients for band 13: 2080-2250 cm-1 (low - h2o, n2o; high - /)
module	module_radlw_kgb14
	This module sets up absorption coefficients for band 14: 2250-2380 cm-1 (low - co2; high - co2)
module	module_radlw_kgb15
	This module sets up absorption coefficients for band 15: 2380-2600 cm-1 (low - n2o, co2; high - /)
module	module_radlw_kgb16
	This module sets up absorption coefficients for band 16: 2600-3000 cm-1 (low - h2o, ch4; high - /)

Functions/Subroutines
subroutine, public	rrtmg_lw::rrtmg_lw_run (plyr, plvl, tlyr, tlvl, qlyr, olyr, gasvmr_co2, gasvmr_n2o, gasvmr_ch4, gasvmr_o2, gasvmr_co, gasvmr_cfc11, gasvmr_cfc12, gasvmr_cfc22, gasvmr_ccl4, icseed, aeraod, aerssa, sfemis, sfgtmp, npts, nlay, nlp1, lprnt, cld_cf, lslwr, hlwc, topflx, sfcflx, HLW0, HLWB, FLXPRF, cld_lwp, cld_ref_liq, cld_iwp, cld_ref_ice, cld_rwp, cld_ref_rain, cld_swp, cld_ref_snow, cld_od, errmsg, errflg )
subroutine, public	rrtmg_lw::rlwinit (me)
	This subroutine performs calculations necessary for the initialization of the longwave model. lookup tables are computed for use in the lw radiative transfer, and input absorption coefficient data for each spectral band are reduced from 256 g-point intervals to 140. More...
subroutine	rrtmg_lw::mcica_subcol (cldf, nlay, ipseed, lcloudy )
	This suroutine computes sub-colum cloud profile flag array. More...
subroutine	rrtmg_lw::setcoef (pavel, tavel, tz, stemp, h2ovmr, colamt, coldry, colbrd, nlay, nlp1, laytrop, pklay, pklev, jp, jt, jt1, rfrate, fac00, fac01, fac10, fac11, selffac, selffrac, indself, forfac, forfrac, indfor, minorfrac, scaleminor, scaleminorn2, indminor )
	This subroutine computes various coefficients needed in radiative transfer calculations. More...
subroutine	rrtmg_lw::rtrn (semiss, delp, cldfrc, taucld, tautot, pklay, pklev, fracs, secdif, nlay, nlp1, totuflux, totdflux, htr, totuclfl, totdclfl, htrcl, htrb )
	This subroutine computes the upward/downward radiative fluxes, and heating rates for both clear or cloudy atmosphere. Clouds assumed as randomly overlaping in a vertical column. More...
subroutine	rrtmg_lw::taumol (laytrop, pavel, coldry, colamt, colbrd, wx, tauaer, rfrate, fac00, fac01, fac10, fac11, jp, jt, jt1, selffac, selffrac, indself, forfac, forfrac, indfor, minorfrac, scaleminor, scaleminorn2, indminor, nlay, fracs, tautot )
	This subroutine contains optical depths developed for the rapid radiative transfer model. \ It contains the subroutines taugbn (where n goes from 1 to 16). taugbn calculates the optical depths and planck fractions per g-value and layer for band n. More...
subroutine	taugb01
	band 1: 10-350 cm-1 (low key - h2o; low minor - n2); (high key - h2o; high minor - n2)
subroutine	taugb02
	Band 2: 350-500 cm-1 (low key - h2o; high key - h2o)
subroutine	taugb03
	Band 3: 500-630 cm-1 (low key - h2o,co2; low minor - n2o); (high key - h2o,co2; high minor - n2o)
subroutine	taugb04
	Band 4: 630-700 cm-1 (low key - h2o,co2; high key - o3,co2)
subroutine	taugb05
	Band 5: 700-820 cm-1 (low key - h2o,co2; low minor - o3, ccl4) (high key - o3,co2)
subroutine	taugb06
	Band 6: 820-980 cm-1 (low key - h2o; low minor - co2) (high key - none; high minor - cfc11, cfc12)
subroutine	taugb07
	Band 7: 980-1080 cm-1 (low key - h2o,o3; low minor - co2) (high key - o3; high minor - co2)
subroutine	taugb08
	Band 8: 1080-1180 cm-1 (low key - h2o; low minor - co2,o3,n2o) (high key - o3; high minor - co2, n2o)
subroutine	taugb09
	Band 9: 1180-1390 cm-1 (low key - h2o,ch4; low minor - n2o) (high key - ch4; high minor - n2o)
subroutine	taugb10
	Band 10: 1390-1480 cm-1 (low key - h2o; high key - h2o)
subroutine	taugb11
	Band 11: 1480-1800 cm-1 (low - h2o; low minor - o2) (high key - h2o; high minor - o2)
subroutine	taugb12
	Band 12: 1800-2080 cm-1 (low - h2o,co2; high - nothing)
subroutine	taugb13
	Band 13: 2080-2250 cm-1 (low key-h2o,n2o; high minor-o3 minor)
subroutine	taugb14
	Band 14: 2250-2380 cm-1 (low - co2; high - co2)
subroutine	taugb15
	Band 15: 2380-2600 cm-1 (low - n2o,co2; low minor - n2) (high - nothing)
subroutine	taugb16
	Band 16: 2600-3250 cm-1 (low key- h2o,ch4; high key - ch4)
subroutine	rrtmg_lw::cldprop (cfrac, cliqp, reliq, cicep, reice, cdat1, cdat2, cdat3, cdat4, nlay, nlp1, ipseed, cldfmc, taucld )
	This subroutine computes the cloud optical depth(s) for each cloudy layer and g-point interval. More...
subroutine	rrtmg_lw::rtrnmr (semiss, delp, cldfrc, taucld, tautot, pklay, pklev, fracs, secdif, nlay, nlp1, totuflux, totdflux, htr, totuclfl, totdclfl, htrcl, htrb )
	This subroutine computes the upward/downward radiative fluxes, and heating rates for both clear or cloudy atmosphere. Clouds are assumed as in maximum-randomly overlaping in a vertical column. More...
subroutine	rrtmg_lw::rtrnmc (semiss, delp, cldfmc, taucld, tautot, pklay, pklev, fracs, secdif, nlay, nlp1, totuflux, totdflux, htr, totuclfl, totdclfl, htrcl, htrb )
	This subroutine computes the upward/downward radiative fluxes, and heating rates for both clear or cloudy atmosphere.Clouds are treated with the mcica stochastic approach. More...

Function/Subroutine Documentation

subroutine rrtmg_lw::cldprop ( real (kind=kind_phys), dimension(0:nlp1), intent(in)  cfrac, real (kind=kind_phys), dimension(nlay), intent(in)  cliqp, real (kind=kind_phys), dimension(nlay), intent(in)  reliq, real (kind=kind_phys), dimension(nlay), intent(in)  cicep, real (kind=kind_phys), dimension(nlay), intent(in)  reice, real (kind=kind_phys), dimension(nlay), intent(in)  cdat1, real (kind=kind_phys), dimension(nlay), intent(in)  cdat2, real (kind=kind_phys), dimension(nlay), intent(in)  cdat3, real (kind=kind_phys), dimension(nlay), intent(in)  cdat4, integer, intent(in)  nlay, integer, intent(in)  nlp1, integer, intent(in)  ipseed, real (kind=kind_phys), dimension(ngptlw,nlay), intent(out)  cldfmc, real (kind=kind_phys), dimension(nbands,nlay), intent(out)  taucld  )

private

Parameters

cfrac	layer cloud fraction — for ilwcliq > 0 (prognostic cloud scheme) - - -
cliqp	layer in-cloud liq water path ( \(g/m^2\))
reliq	mean eff radius for liq cloud (micron)
cicep	layer in-cloud ice water path ( \(g/m^2\))
reice	mean eff radius for ice cloud (micron)
cdat1	layer rain drop water path ( \(g/m^2\))
cdat2	effective radius for rain drop (micron)
cdat3	layer snow flake water path( \(g/m^2\))
cdat4	mean effective radius for snow flake(micron) — for ilwcliq = 0 (diagnostic cloud scheme) - - -
cliqp	not used
cicep	not used
reliq	not used
reice	not used
cdat1	layer cloud optical depth
cdat2	layer cloud single scattering albedo
cdat3	layer cloud asymmetry factor
cdat4	optional use
nlay	number of layer number
nlp1	number of veritcal levels
ipseed	permutation seed for generating random numbers (isubclw>0)
cldfmc	cloud fraction for each sub-column
taucld	cloud optical depth for bands (non-mcica)

General Algorithm

1. Compute cloud radiative properties for a cloudy column:
   - Compute cloud radiative properties for rain and snow (tauran,tausnw)
   - Calculation of absorption coefficients due to water clouds(tauliq)
   - Calculation of absorption coefficients due to ice clouds (tauice).
   - For prognostic cloud scheme: sum up the cloud optical property:
   \( taucld=tauice+tauliq+tauran+tausnw \)
2. if physparam::isubclw > 0, call mcica_subcol() to distribute cloud properties to each g-point.

References rrtmg_lw::mcica_subcol().

Referenced by rrtmg_lw::rrtmg_lw_run().

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subroutine rrtmg_lw::mcica_subcol ( real (kind=kind_phys), dimension(nlay), intent(in)  cldf, integer, intent(in)  nlay, integer, intent(in)  ipseed, logical, dimension(ngptlw,nlay), intent(out)  lcloudy  )

private

Parameters

cldf	layer cloud fraction
nlay	number of model vertical layers
ipseed	permute seed for random num generator
lcloudy	sub-colum cloud profile flag array

Referenced by rrtmg_lw::cldprop().

subroutine, public rrtmg_lw::rlwinit

(

integer, intent(in)

me

)

Parameters

me	print control for parallel process

subroutine, public rrtmg_lw::rrtmg_lw_run	(	real (kind=kind_phys), dimension(npts,nlay), intent(in)	plyr,
		real (kind=kind_phys), dimension(npts,nlp1), intent(in)	plvl,
		real (kind=kind_phys), dimension(npts,nlay), intent(in)	tlyr,
		real (kind=kind_phys), dimension(npts,nlp1), intent(in)	tlvl,
		real (kind=kind_phys), dimension(npts,nlay), intent(in)	qlyr,
		real (kind=kind_phys), dimension(npts,nlay), intent(in)	olyr,
		real (kind=kind_phys), dimension(npts,nlay), intent(in)	gasvmr_co2,
		real (kind=kind_phys), dimension(npts,nlay), intent(in)	gasvmr_n2o,
		real (kind=kind_phys), dimension(npts,nlay), intent(in)	gasvmr_ch4,
		real (kind=kind_phys), dimension(npts,nlay), intent(in)	gasvmr_o2,
		real (kind=kind_phys), dimension(npts,nlay), intent(in)	gasvmr_co,
		real (kind=kind_phys), dimension(npts,nlay), intent(in)	gasvmr_cfc11,
		real (kind=kind_phys), dimension(npts,nlay), intent(in)	gasvmr_cfc12,
		real (kind=kind_phys), dimension(npts,nlay), intent(in)	gasvmr_cfc22,
		real (kind=kind_phys), dimension(npts,nlay), intent(in)	gasvmr_ccl4,
		integer, dimension(npts), intent(in)	icseed,
		real (kind=kind_phys), dimension(npts,nlay,nbands), intent(in)	aeraod,
		real (kind=kind_phys), dimension(npts,nlay,nbands), intent(in)	aerssa,
		real (kind=kind_phys), dimension(npts), intent(in)	sfemis,
		real (kind=kind_phys), dimension(npts), intent(in)	sfgtmp,
		integer, intent(in)	npts,
		integer, intent(in)	nlay,
		integer, intent(in)	nlp1,
		logical, intent(in)	lprnt,
		real (kind=kind_phys), dimension(npts,nlay), intent(in)	cld_cf,
		logical, intent(in)	lslwr,
		real (kind=kind_phys), dimension(npts,nlay), intent(inout)	hlwc,
		type (topflw_type), dimension(npts), intent(inout)	topflx,
		type (sfcflw_type), dimension(npts), intent(inout)	sfcflx,
		real (kind=kind_phys), dimension(npts,nlay), intent(inout), optional	HLW0,
		real (kind=kind_phys), dimension(npts,nlay,nbands), intent(inout), optional	HLWB,
		type (proflw_type), dimension(npts,nlp1), intent(inout), optional	FLXPRF,
		real (kind=kind_phys), dimension(npts,nlay), intent(in), optional	cld_lwp,
		real (kind=kind_phys), dimension(npts,nlay), intent(in), optional	cld_ref_liq,
		real (kind=kind_phys), dimension(npts,nlay), intent(in), optional	cld_iwp,
		real (kind=kind_phys), dimension(npts,nlay), intent(in), optional	cld_ref_ice,
		real (kind=kind_phys), dimension(npts,nlay), intent(in), optional	cld_rwp,
		real (kind=kind_phys), dimension(npts,nlay), intent(in), optional	cld_ref_rain,
		real (kind=kind_phys), dimension(npts,nlay), intent(in), optional	cld_swp,
		real (kind=kind_phys), dimension(npts,nlay), intent(in), optional	cld_ref_snow,
		real (kind=kind_phys), dimension(npts,nlay), intent(in), optional	cld_od,
		character(len=*), intent(out)	errmsg,
		integer, intent(out)	errflg
	)

1. Change random number seed value for each radiation invocation (isubclw =1 or 2).
2. Read surface emissivity.
3. Prepare atmospheric profile for use in rrtm.
4. Set absorber amount for h2o, co2, and o3.
5. Set up column amount for rare gases n2o,ch4,o2,co,ccl4,cf11,cf12, cf22, convert from volume mixing ratio to molec/cm2 based on coldry (scaled to 1.0e-20).
6. Set aerosol optical properties.
7. Read cloud optical properties.
8. Compute precipitable water vapor for diffusivity angle adjustments.
9. Compute column amount for broadening gases.
10. Compute diffusivity angle adjustments.
11. For cloudy atmosphere, call cldprop() to set cloud optical properties.
12. Calling setcoef() to compute various coefficients needed in radiative transfer calculations.
13. Call taumol() to calculte the gaseous optical depths and Plank fractions for each longwave spectral band.
14. Call the radiative transfer routine based on cloud scheme selection. Compute the upward/downward radiative fluxes, and heating rates for both clear or cloudy atmosphere.
    - call rtrn(): clouds are assumed as randomly overlaping in a vertical column
    - call rtrnmr(): clouds are assumed as in maximum-randomly overlaping in a vertical column;
    - call rtrnmc(): clouds are treated with the mcica stochastic approach.
15. Save outputs.

References rrtmg_lw::cldprop(), rrtmg_lw::rtrn(), rrtmg_lw::rtrnmc(), rrtmg_lw::rtrnmr(), rrtmg_lw::setcoef(), and rrtmg_lw::taumol().

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subroutine rrtmg_lw::rtrn ( real (kind=kind_phys), dimension(nbands), intent(in)  semiss, real (kind=kind_phys), dimension(nlay), intent(in)  delp, real (kind=kind_phys), dimension(0:nlp1), intent(in)  cldfrc, real (kind=kind_phys), dimension(nbands,nlay), intent(in)  taucld, real (kind=kind_phys), dimension(ngptlw,nlay), intent(in)  tautot, real (kind=kind_phys), dimension(nbands,0:nlay), intent(in)  pklay, real (kind=kind_phys), dimension(nbands,0:nlay), intent(in)  pklev, real (kind=kind_phys), dimension(ngptlw,nlay), intent(in)  fracs, real (kind=kind_phys), dimension(nbands), intent(in)  secdif, integer, intent(in)  nlay, integer, intent(in)  nlp1, real (kind=kind_phys), dimension(0:nlay), intent(out)  totuflux, real (kind=kind_phys), dimension(0:nlay), intent(out)  totdflux, real (kind=kind_phys), dimension(nlay), intent(out)  htr, real (kind=kind_phys), dimension(0:nlay), intent(out)  totuclfl, real (kind=kind_phys), dimension(0:nlay), intent(out)  totdclfl, real (kind=kind_phys), dimension(nlay), intent(out)  htrcl, real (kind=kind_phys), dimension(nlay,nbands), intent(out)  htrb  )

private

Original Code Description: this program calculates the upward fluxes, downward fluxes, and heating rates for an arbitrary clear or cloudy atmosphere. The input to this program is the atmospheric profile, all Planck function information, and the cloud fraction by layer. A variable diffusivity angle (secdif) is used for the angle integration. Bands 2-3 and 5-9 use a value for secdif that varies from 1.50 to 1.80 as a function of the column water vapor, and other bands use a value of 1.66. The gaussian weight appropriate to this angle (wtdiff =0.5) is applied here. Note that use of the emissivity angle for the flux integration can cause errors of 1 to 4 \(W/m^2\) within cloudy layers. Clouds are treated with a random cloud overlap method.

Parameters

semiss	lw surface emissivity
delp	layer pressure thickness (mb)
cldfrc	layer cloud fraction
taucld	layer cloud opt depth
tautot	total optical depth (gas+aerosols)
pklay	integrated planck function at lay temp
pklev	integrated planck func at lev temp
fracs	planck fractions
secdif	secant of diffusivity angle
nlay	number of vertical layers
nlp1	number of vertical levels (interfaces)
totuflux	total sky upward flux \((w/m^2)\)
totdflux	total sky downward flux \((w/m^2)\)
htr	total sky heating rate (k/sec or k/day)
totuclfl	clear sky upward flux \((w/m^2)\)
totdclfl	clear sky downward flux \((w/m^2)\)
htrcl	clear sky heating rate (k/sec or k/day)
htrb	spectral band lw heating rate (k/day)

1. Downward radiative transfer loop.
2. Compute spectral emissivity & reflectance, include the contribution of spectrally varying longwave emissivity and reflection from the surface to the upward radiative transfer.
3. Compute total sky radiance.
4. Compute clear sky radiance
5. Upward radiative transfer loop.
6. Process longwave output from band for total and clear streams. Calculate upward, downward, and net flux.

Referenced by rrtmg_lw::rrtmg_lw_run().

subroutine rrtmg_lw::rtrnmc ( real (kind=kind_phys), dimension(nbands), intent(in)  semiss, real (kind=kind_phys), dimension(nlay), intent(in)  delp, real (kind=kind_phys), dimension(ngptlw,nlay), intent(in)  cldfmc, real (kind=kind_phys), dimension(nbands,nlay), intent(in)  taucld, real (kind=kind_phys), dimension(ngptlw,nlay), intent(in)  tautot, real (kind=kind_phys), dimension(nbands,0:nlay), intent(in)  pklay, real (kind=kind_phys), dimension(nbands,0:nlay), intent(in)  pklev, real (kind=kind_phys), dimension(ngptlw,nlay), intent(in)  fracs, real (kind=kind_phys), dimension(nbands), intent(in)  secdif, integer, intent(in)  nlay, integer, intent(in)  nlp1, real (kind=kind_phys), dimension(0:nlay), intent(out)  totuflux, real (kind=kind_phys), dimension(0:nlay), intent(out)  totdflux, real (kind=kind_phys), dimension(nlay), intent(out)  htr, real (kind=kind_phys), dimension(0:nlay), intent(out)  totuclfl, real (kind=kind_phys), dimension(0:nlay), intent(out)  totdclfl, real (kind=kind_phys), dimension(nlay), intent(out)  htrcl, real (kind=kind_phys), dimension(nlay,nbands), intent(out)  htrb  )

private

Parameters

semiss	lw surface emissivity
delp	layer pressure thickness (mb)
cldfmc	layer cloud fraction (sub-column)
taucld	layer cloud opt depth
tautot	total optical depth (gas+aerosols)
pklay	integrated planck func at lay temp
pklev	integrated planck func at lev temp
fracs	planck fractions
secdif	secant of diffusivity angle
nlay	number of vertical layers
nlp1	number of vertical levels (interfaces)
totuflux	total sky upward flux \((w/m^2)\)
totdflux	total sky downward flux \((w/m^2)\)
htr	total sky heating rate (k/sec or k/day)
totuclfl	clear sky upward flux \((w/m^2)\)
totdclfl	clear sky downward flux \((w/m^2)\)
htrcl	clear sky heating rate (k/sec or k/day)
htrb	spectral band lw heating rate (k/day)

General Algorithm

1. Downward radiative transfer loop.
   - Clear sky, gases contribution
   - Total sky, gases+clouds contribution
   - Cloudy layer
   - Total sky radiance
   - Clear sky radiance
2. Compute spectral emissivity & reflectance, include the contribution of spectrally varying longwave emissivity and reflection from the surface to the upward radiative transfer.
3. Compute total sky radiance
4. Compute clear sky radiance
5. Upward radiative transfer loop
   - Compute total sky radiance
   - Compute clear sky radiance
6. Process longwave output from band for total and clear streams. Calculate upward, downward, and net flux.

Referenced by rrtmg_lw::rrtmg_lw_run().

subroutine rrtmg_lw::rtrnmr ( real (kind=kind_phys), dimension(nbands), intent(in)  semiss, real (kind=kind_phys), dimension(nlay), intent(in)  delp, real (kind=kind_phys), dimension(0:nlp1), intent(in)  cldfrc, real (kind=kind_phys), dimension(nbands,nlay), intent(in)  taucld, real (kind=kind_phys), dimension(ngptlw,nlay), intent(in)  tautot, real (kind=kind_phys), dimension(nbands,0:nlay), intent(in)  pklay, real (kind=kind_phys), dimension(nbands,0:nlay), intent(in)  pklev, real (kind=kind_phys), dimension(ngptlw,nlay), intent(in)  fracs, real (kind=kind_phys), dimension(nbands), intent(in)  secdif, integer, intent(in)  nlay, integer, intent(in)  nlp1, real (kind=kind_phys), dimension(0:nlay), intent(out)  totuflux, real (kind=kind_phys), dimension(0:nlay), intent(out)  totdflux, real (kind=kind_phys), dimension(nlay), intent(out)  htr, real (kind=kind_phys), dimension(0:nlay), intent(out)  totuclfl, real (kind=kind_phys), dimension(0:nlay), intent(out)  totdclfl, real (kind=kind_phys), dimension(nlay), intent(out)  htrcl, real (kind=kind_phys), dimension(nlay,nbands), intent(out)  htrb  )

private

Parameters

semiss	lw surface emissivity
delp	layer pressure thickness (mb)
cldfrc	layer cloud fraction
taucld	layer cloud opt depth
tautot	total optical depth (gas+aerosols)
pklay	integrated planck func at lay temp
pklev	integrated planck func at lev temp
fracs	planck fractions
secdif	secant of diffusivity angle
nlay	number of vertical layers
nlp1	number of vertical levels (interfaces)
totuflux	total sky upward flux ( \(w/m^2\))
totdflux	total sky downward flux ( \(w/m^2\))
htr	total sky heating rate (k/sec or k/day)
totuclfl	clear sky upward flux ( \(w/m^2\))
totdclfl	clear sky downward flux ( \(w/m^2\))
htrcl	clear sky heating rate (k/sec or k/day)
htrb	spectral band lw heating rate (k/day)

General Algorithm

1. Setup maximum/random cloud overlap.
2. Initialize for radiative transfer
3. Downward radiative transfer loop:
   • cloudy layer
   • total sky radiance
   • clear sky radiance
4. Compute spectral emissivity & reflectance, include the contribution of spectrally varying longwave emissivity and reflection from the surface to the upward radiative transfer.
5. Compute total sky radiance.
6. Compute clear sky radiance.
7. Upward radiative transfer loop:
   • cloudy layer radiance
   • total sky radiance
   • clear sky radiance
8. Process longwave output from band for total and clear streams. calculate upward, downward, and net flux.

Referenced by rrtmg_lw::rrtmg_lw_run().

subroutine rrtmg_lw::setcoef ( real (kind=kind_phys), dimension(nlay), intent(in)  pavel, real (kind=kind_phys), dimension(nlay), intent(in)  tavel, real (kind=kind_phys), dimension(0:nlay), intent(in)  tz, real (kind=kind_phys), intent(in)  stemp, real (kind=kind_phys), dimension(nlay), intent(in)  h2ovmr, real (kind=kind_phys), dimension(nlay,maxgas), intent(in)  colamt, real (kind=kind_phys), dimension(nlay), intent(in)  coldry, real (kind=kind_phys), dimension(nlay), intent(in)  colbrd, integer, intent(in)  nlay, integer, intent(in)  nlp1, integer, intent(out)  laytrop, real (kind=kind_phys), dimension(nbands,0:nlay), intent(out)  pklay, real (kind=kind_phys), dimension(nbands,0:nlay), intent(out)  pklev, integer, dimension(nlay), intent(out)  jp, integer, dimension(nlay), intent(out)  jt, integer, dimension(nlay), intent(out)  jt1, real (kind=kind_phys), dimension(nlay,nrates,2), intent(out)  rfrate, real (kind=kind_phys), dimension(nlay), intent(out)  fac00, real (kind=kind_phys), dimension(nlay), intent(out)  fac01, real (kind=kind_phys), dimension(nlay), intent(out)  fac10, real (kind=kind_phys), dimension(nlay), intent(out)  fac11, real (kind=kind_phys), dimension(nlay), intent(out)  selffac, real (kind=kind_phys), dimension(nlay), intent(out)  selffrac, integer, dimension(nlay), intent(out)  indself, real (kind=kind_phys), dimension(nlay), intent(out)  forfac, real (kind=kind_phys), dimension(nlay), intent(out)  forfrac, integer, dimension(nlay), intent(out)  indfor, real (kind=kind_phys), dimension(nlay), intent(out)  minorfrac, real (kind=kind_phys), dimension(nlay), intent(out)  scaleminor, real (kind=kind_phys), dimension(nlay), intent(out)  scaleminorn2, integer, dimension(nlay), intent(out)  indminor  )

private

Parameters

pavel	layer pressure (mb)
tavel	layer temperature (K)
tz	level(interface) temperatures (K)
stemp	surface ground temperature (K)
h2ovmr	layer w.v. volumn mixing ratio (kg/kg)
colamt	column amounts of absorbing gases. 2nd indices range: 1-maxgas, for watervapor,carbon dioxide, ozone, nitrous oxide, methane,oxigen, carbon monoxide,etc. \((mol/cm^2)\)
coldry	dry air column amount
colbrd	column amount of broadening gases
nlay	total number of vertical layers
nlp1	total number of vertical levels
laytrop	tropopause layer index (unitless)
pklay	integrated planck func at lay temp
pklev	integrated planck func at lev temp
jp	indices of lower reference pressure
jt,jt1	indices of lower reference temperatures
rfrate	ref ratios of binary species param (:,m,:)m=1-h2o/co2,2-h2o/o3,3-h2o/n2o, 4-h2o/ch4,5-n2o/co2,6-o3/co2 (:,:,n)n=1,2: the rates of ref press at the 2 sides of the layer
facij	factors multiply the reference ks, i,j=0/1 for lower/higher of the 2 appropriate temperatures and altitudes.
selffac	scale factor for w. v. self-continuum equals (w. v. density)/(atmospheric density at 296k and 1013 mb)
selffrac	factor for temperature interpolation of reference w. v. self-continuum data
indself	index of lower ref temp for selffac
forfac	scale factor for w. v. foreign-continuum
forfrac	factor for temperature interpolation of reference w.v. foreign-continuum data
indfor	index of lower ref temp for forfac
minorfrac	factor for minor gases
scaleminor,scaleminorn2	scale factors for minor gases
indminor	index of lower ref temp for minor gases

Referenced by rrtmg_lw::rrtmg_lw_run().

subroutine rrtmg_lw::taumol ( integer, intent(in)  laytrop, real (kind=kind_phys), dimension(nlay), intent(in)  pavel, real (kind=kind_phys), dimension(nlay), intent(in)  coldry, real (kind=kind_phys), dimension(nlay,maxgas), intent(in)  colamt, real (kind=kind_phys), dimension(nlay), intent(in)  colbrd, real (kind=kind_phys), dimension(nlay,maxxsec), intent(in)  wx, real (kind=kind_phys), dimension(nbands,nlay), intent(in)  tauaer, real (kind=kind_phys), dimension(nlay,nrates,2), intent(in)  rfrate, real (kind=kind_phys), dimension(nlay), intent(in)  fac00, real (kind=kind_phys), dimension(nlay), intent(in)  fac01, real (kind=kind_phys), dimension(nlay), intent(in)  fac10, real (kind=kind_phys), dimension(nlay), intent(in)  fac11, integer, dimension(nlay), intent(in)  jp, integer, dimension(nlay), intent(in)  jt, integer, dimension(nlay), intent(in)  jt1, real (kind=kind_phys), dimension(nlay), intent(in)  selffac, real (kind=kind_phys), dimension(nlay), intent(in)  selffrac, integer, dimension(nlay), intent(in)  indself, real (kind=kind_phys), dimension(nlay), intent(in)  forfac, real (kind=kind_phys), dimension(nlay), intent(in)  forfrac, integer, dimension(nlay), intent(in)  indfor, real (kind=kind_phys), dimension(nlay), intent(in)  minorfrac, real (kind=kind_phys), dimension(nlay), intent(in)  scaleminor, real (kind=kind_phys), dimension(nlay), intent(in)  scaleminorn2, integer, dimension(nlay), intent(in)  indminor, integer, intent(in)  nlay, real (kind=kind_phys), dimension(ngptlw,nlay), intent(out)  fracs, real (kind=kind_phys), dimension(ngptlw,nlay), intent(out)  tautot  )

private

Parameters

laytrop	tropopause layer index (unitless) layer at which switch is made for key species
pavel	layer pressures (mb)
coldry	column amount for dry air \((mol/cm^2)\)
colamt	column amounts of h2o, co2, o3, n2o, ch4,o2, co \((mol/cm^2)\)
colbrd	column amount of broadening gases
wx	cross-section amounts \((mol/cm^2)\)
tauaer	aerosol optical depth
rfrate	reference ratios of binary species parameter (:,m,:)m=1-h2o/co2,2-h2o/o3,3-h2o/n2o,4-h2o/ch4, 5-n2o/co2,6-o3/co2 (:,:,n)n=1,2: the rates of ref press at the 2 sides of the layer
facij	factors multiply the reference ks, i,j of 0/1 for lower/higher of the 2 appropriate temperatures and altitudes
jp	index of lower reference pressure
jt,jt1	indices of lower reference temperatures for pressure levels jp and jp+1, respectively
selffac	scale factor for water vapor self-continuum equals (water vapor density)/(atmospheric density at 296k and 1013 mb)
selffrac	factor for temperature interpolation of reference water vapor self-continuum data
indself	index of lower reference temperature for the self-continuum interpolation
forfac	scale factor for w. v. foreign-continuum
forfrac	factor for temperature interpolation of reference w.v. foreign-continuum data
indfor	index of lower reference temperature for the foreign-continuum interpolation
minorfrac	factor for minor gases
scaleminor,scaleminorn2	scale factors for minor gases
indminor	index of lower reference temperature for minor gases
nlay	total number of layers
fracs	planck fractions
tautot	total optical depth (gas+aerosols)

References taugb01(), taugb02(), taugb03(), taugb04(), taugb05(), taugb06(), taugb07(), taugb08(), taugb09(), taugb10(), taugb11(), taugb12(), taugb13(), taugb14(), taugb15(), and taugb16().

Referenced by rrtmg_lw::rrtmg_lw_run().

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