RRTMG Clouds Module

This module computes cloud related quantities for radiation computations. More...

Detailed Description

Knowledge of cloud properties and their vertical structure is important for meteorological studies due to their impact on both the Earth's radiation budget and adiabatic heating within the atmosphere. Cloud properties in the US National Oceanic and Atmospheric Administration National Centers for Environmental Prediction Global Forecast System (GFS) include (i) cloud liquid/ice water path; (ii) the fraction of clouds; (iii) effective radius of water/ice droplet:

Cloud prediction model (namelist control parameter - NTCW, IMP_PHYSICS):
NTCW=0: legacy diagnostic cloud scheme based on RH-table lookup table
NTCW>0: prognostic cloud condensate
IMP_PHYSICS =98/99: Zhao-Carr-Sundqvist MP - Xu-Randall diagnostic cloud fraction
IMP_PHYSICS =11: GFDL MP - unified diagnostic cloud fraction provided by GFDL MP

Cloud overlapping method (namelist control parameter - IOVR_LW, IOVR_SW)
IOVR=0: randomly overlapping vertical cloud layers
IOVR=1: maximum-random overlapping vertical cloud layers

Sub-grid cloud approximation (namelist control parameter - ISUBC_LW=2, ISUBC_SW=2)
ISUBC=0: grid averaged quantities, without sub-grid cloud approximation
ISUBC=1: with McICA sub-grid approximation (use prescribed permutation seeds)
ISUBC=2: with McICA sub-grid approximation (use random permutation seeds)

Version

NCEP-Radiation_clouds v5.1 Nov 2012

Functions/Subroutines
subroutine	module_microphysics::rsipath2 (plyr, plvl, tlyr, qlyr, qcwat, qcice, qrain, rrime, IM, LEVS, iflip, flgmin, cwatp, cicep, rainp, snowp, recwat, rerain, resnow, snden )
	This program is a modified version of Ferrier's original "rshipath" subprogram. It computes layer's cloud liquid, ice, rain, and snow water condensate path and the partical effective radius for liquid droplet, rain drop, and snow flake. More...
subroutine, public	module_radiation_clouds::cld_init (si, NLAY, imp_physics, me)
	This subroutine is an initialization program for cloud-radiation calculations and sets up boundary layer cloud top. More...
subroutine, public	module_radiation_clouds::progcld1 (plyr, plvl, tlyr, tvly, qlyr, qstl, rhly, clw, xlat, xlon, slmsk, dz, delp, IX, NLAY, NLP1, uni_cld, lmfshal, lmfdeep2, cldcov, effrl, effri, effrr, effrs, effr_in, clouds, clds, mtop, mbot, de_lgth )
	This subroutine computes cloud related quantities using zhao/moorthi's prognostic cloud microphysics scheme. More...
subroutine, public	module_radiation_clouds::progcld2 (plyr, plvl, tlyr, tvly, qlyr, qstl, rhly, clw, xlat, xlon, slmsk, dz, delp, f_ice, f_rain, r_rime, flgmin, IX, NLAY, NLP1, lmfshal, lmfdeep2, clouds, clds, mtop, mbot, de_lgth )
	This subroutine computes cloud related quantities using Ferrier's prognostic cloud microphysics scheme. More...
subroutine, public	module_radiation_clouds::progcld3 (plyr, plvl, tlyr, tvly, qlyr, qstl, rhly, clw, cnvw, cnvc, xlat, xlon, slmsk, dz, delp, ix, nlay, nlp1, deltaq, sup, kdt, me, clouds, clds, mtop, mbot, de_lgth )
	This subroutine computes cloud related quantities using zhao/moorthi's prognostic cloud microphysics scheme + pdfcld. More...
subroutine, public	module_radiation_clouds::progcld4 (plyr, plvl, tlyr, tvly, qlyr, qstl, rhly, clw, cnvw, cnvc, xlat, xlon, slmsk, cldtot, dz, delp, IX, NLAY, NLP1, clouds, clds, mtop, mbot, de_lgth )
	This subroutine computes cloud related quantities using GFDL Lin MP prognostic cloud microphysics scheme. More...
subroutine, public	module_radiation_clouds::progcld4o (plyr, plvl, tlyr, tvly, qlyr, qstl, rhly, clw, xlat, xlon, slmsk, dz, delp, ntrac, ntcw, ntiw, ntrw, ntsw, ntgl, ntclamt, IX, NLAY, NLP1, clouds, clds, mtop, mbot, de_lgth )
	This subroutine computes cloud related quantities using GFDL Lin MP prognostic cloud microphysics scheme. Moist species from MP are fed into the corresponding arrays for calculation of cloud fractions. More...
subroutine, public	module_radiation_clouds::progcld5 (plyr, plvl, tlyr, qlyr, qstl, rhly, clw, xlat, xlon, slmsk, dz, delp, ntrac, ntcw, ntiw, ntrw, ntsw, ntgl, IX, NLAY, NLP1, uni_cld, lmfshal, lmfdeep2, cldcov, re_cloud, re_ice, re_snow, clouds, clds, mtop, mbot, de_lgth )
	This subroutine computes cloud related quantities using Thompson/WSM6 cloud microphysics scheme. More...
subroutine, public	module_radiation_clouds::progclduni (plyr, plvl, tlyr, tvly, ccnd, ncnd, xlat, xlon, slmsk, dz, delp, IX, NLAY, NLP1, cldtot, effrl, effri, effrr, effrs, effr_in, clouds, clds, mtop, mbot, de_lgth )
	This subroutine computes cloud related quantities using for unified cloud microphysics scheme. More...
subroutine, public	module_radiation_clouds::gethml (plyr, ptop1, cldtot, cldcnv, dz, de_lgth, IX, NLAY, clds, mtop, mbot )
	This subroutine computes high, mid, low, total, and boundary cloud fractions and cloud top/bottom layer indices for model diagnostic output. The three cloud domain boundaries are defined by ptopc. The cloud overlapping method is defined by control flag 'iovr', which is also used by LW and SW radiation programs. More...
subroutine, public	module_radiation_clouds::get_alpha_exp (nlon, nlay, dzlay, iovrlp, latdeg, juldat, yearlen, cldf, alpha)
	This program derives the exponential transition, alpha, from maximum to random overlap needed to define the fractional cloud vertical correlation for the exponential (EXP, iovrlp=4) or the exponential-random (ER, iovrlp=5) cloud overlap options for RRTMGP. For exponential, the transition from maximum to random with distance through model layers occurs without regard to the configuration of clear and cloudy layers. For the ER method, each block of adjacent cloudy layers is treated with a separate transition from maximum to random, and blocks of cloudy layers separated by one or more clear layers are correlated randomly. /param nlon : number of model longitude points /param nlay : vertical layer dimension /param dzlay(nlon,nlay) : distance between the center of model layers /param iovrlp : cloud overlap method : 0 = random : 1 = maximum-random : 2 = maximum : 3 = decorrelation (NOAA/Hou) : 4 = exponential (AER) : 5 = exponential-random (AER) /param latdeg(nlon) : latitude (in degrees 90 -> -90) /param juldat : day of the year (fractional julian day) /param yearlen : current length of the year (365/366 days) /param cldf(nlon,nlay) : cloud fraction /param idcor : decorrelation length method : 0 = constant value (AER; decorr_con) : 1 = latitude and day of year varying value (AER; Oreopoulos, et al., 2012) /param decorr_con : decorrelation length constant. More...
subroutine, public	module_radiation_clouds::get_alpha_dcorr (nCol, nLev, lat, con_pi, deltaZ, de_lgth, cloud_overlap_param)
	This subroutine computes high, mid, low, total, and boundary cloud fractions and cloud top/bottom layer indices for model diagnostic output. The three cloud domain boundaries are defined by ptopc. The cloud overlapping method is defined by control flag 'iovr', which is also used by LW and SW radiation programs. More...