| 1 | ! path: $Source: /storm/rc1/cvsroot/rc/rrtmg_lw/src/rrtmg_lw_rtrnmc.f90,v $ |
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| 2 | ! author: $Author: mike $ |
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| 3 | ! revision: $Revision: 1.7 $ |
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| 4 | ! created: $Date: 2009/11/12 20:52:25 $ |
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| 5 | ! |
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| 6 | module rrtmg_lw_rtrnmc |
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| 7 | |
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| 8 | ! -------------------------------------------------------------------------- |
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| 9 | ! | | |
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| 10 | ! | Copyright 2002-2009, Atmospheric & Environmental Research, Inc. (AER). | |
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| 11 | ! | This software may be used, copied, or redistributed as long as it is | |
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| 12 | ! | not sold and this copyright notice is reproduced on each copy made. | |
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| 13 | ! | This model is provided as is without any express or implied warranties. | |
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| 14 | ! | (http://www.rtweb.aer.com/) | |
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| 15 | ! | | |
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| 16 | ! -------------------------------------------------------------------------- |
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| 17 | |
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| 18 | ! --------- Modules ---------- |
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| 19 | |
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| 20 | use parkind, only : im => kind_im, rb => kind_rb |
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| 21 | use parrrtm, only : mg, nbndlw, ngptlw |
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| 22 | use rrlw_con, only: fluxfac, heatfac |
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| 23 | use rrlw_wvn, only: delwave, ngb, ngs |
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| 24 | use rrlw_tbl, only: tblint, bpade, tau_tbl, exp_tbl, tfn_tbl |
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| 25 | use rrlw_vsn, only: hvrrtc, hnamrtc |
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| 26 | |
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| 27 | implicit none |
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| 28 | |
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| 29 | contains |
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| 30 | |
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| 31 | !----------------------------------------------------------------------------- |
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| 32 | subroutine rtrnmc(nlayers, istart, iend, iout, pz, semiss, ncbands, & |
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| 33 | cldfmc, taucmc, planklay, planklev, plankbnd, & |
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| 34 | pwvcm, fracs, taut, & |
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| 35 | totuflux, totdflux, fnet, htr, & |
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| 36 | totuclfl, totdclfl, fnetc, htrc, & |
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| 37 | idrv, dplankbnd_dt, dtotuflux_dt, dtotuclfl_dt ) |
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| 38 | !----------------------------------------------------------------------------- |
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| 39 | ! |
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| 40 | ! Original version: E. J. Mlawer, et al. RRTM_V3.0 |
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| 41 | ! Revision for GCMs: Michael J. Iacono; October, 2002 |
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| 42 | ! Revision for F90: Michael J. Iacono; June, 2006 |
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| 43 | ! Revision for dFdT option: M. J. Iacono and E. J. Mlawer, November 2009 |
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| 44 | ! |
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| 45 | ! This program calculates the upward fluxes, downward fluxes, and |
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| 46 | ! heating rates for an arbitrary clear or cloudy atmosphere. The input |
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| 47 | ! to this program is the atmospheric profile, all Planck function |
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| 48 | ! information, and the cloud fraction by layer. A variable diffusivity |
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| 49 | ! angle (SECDIFF) is used for the angle integration. Bands 2-3 and 5-9 |
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| 50 | ! use a value for SECDIFF that varies from 1.50 to 1.80 as a function of |
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| 51 | ! the column water vapor, and other bands use a value of 1.66. The Gaussian |
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| 52 | ! weight appropriate to this angle (WTDIFF=0.5) is applied here. Note that |
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| 53 | ! use of the emissivity angle for the flux integration can cause errors of |
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| 54 | ! 1 to 4 W/m2 within cloudy layers. |
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| 55 | ! Clouds are treated with the McICA stochastic approach and maximum-random |
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| 56 | ! cloud overlap. |
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| 57 | ! This subroutine also provides the optional capability to calculate |
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| 58 | ! the derivative of upward flux respect to surface temperature using |
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| 59 | ! the pre-tabulated derivative of the Planck function with respect to |
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| 60 | ! temperature integrated over each spectral band. |
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| 61 | !*************************************************************************** |
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| 62 | |
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| 63 | ! ------- Declarations ------- |
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| 64 | |
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| 65 | ! ----- Input ----- |
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| 66 | integer(kind=im), intent(in) :: nlayers ! total number of layers |
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| 67 | integer(kind=im), intent(in) :: istart ! beginning band of calculation |
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| 68 | integer(kind=im), intent(in) :: iend ! ending band of calculation |
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| 69 | integer(kind=im), intent(in) :: iout ! output option flag |
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| 70 | |
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| 71 | ! Atmosphere |
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| 72 | real(kind=rb), intent(in) :: pz(0:) ! level (interface) pressures (hPa, mb) |
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| 73 | ! Dimensions: (0:nlayers) |
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| 74 | real(kind=rb), intent(in) :: pwvcm ! precipitable water vapor (cm) |
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| 75 | real(kind=rb), intent(in) :: semiss(:) ! lw surface emissivity |
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| 76 | ! Dimensions: (nbndlw) |
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| 77 | real(kind=rb), intent(in) :: planklay(:,:) ! |
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| 78 | ! Dimensions: (nlayers,nbndlw) |
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| 79 | real(kind=rb), intent(in) :: planklev(0:,:) ! |
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| 80 | ! Dimensions: (0:nlayers,nbndlw) |
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| 81 | real(kind=rb), intent(in) :: plankbnd(:) ! |
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| 82 | ! Dimensions: (nbndlw) |
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| 83 | real(kind=rb), intent(in) :: fracs(:,:) ! |
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| 84 | ! Dimensions: (nlayers,ngptw) |
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| 85 | real(kind=rb), intent(in) :: taut(:,:) ! gaseous + aerosol optical depths |
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| 86 | ! Dimensions: (nlayers,ngptlw) |
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| 87 | |
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| 88 | ! Clouds |
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| 89 | integer(kind=im), intent(in) :: ncbands ! number of cloud spectral bands |
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| 90 | real(kind=rb), intent(in) :: cldfmc(:,:) ! layer cloud fraction [mcica] |
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| 91 | ! Dimensions: (ngptlw,nlayers) |
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| 92 | real(kind=rb), intent(in) :: taucmc(:,:) ! layer cloud optical depth [mcica] |
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| 93 | ! Dimensions: (ngptlw,nlayers) |
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| 94 | integer(kind=im), intent(in) :: idrv ! flag for calculation of dF/dt from |
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| 95 | ! Planck derivative [0=off, 1=on] |
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| 96 | real(kind=rb), intent(in) :: dplankbnd_dt(:) ! derivative of Planck function wrt temp |
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| 97 | ! Dimensions: (nbndlw) |
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| 98 | |
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| 99 | ! ----- Output ----- |
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| 100 | real(kind=rb), intent(out) :: totuflux(0:) ! upward longwave flux (w/m2) |
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| 101 | ! Dimensions: (0:nlayers) |
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| 102 | real(kind=rb), intent(out) :: totdflux(0:) ! downward longwave flux (w/m2) |
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| 103 | ! Dimensions: (0:nlayers) |
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| 104 | real(kind=rb), intent(out) :: fnet(0:) ! net longwave flux (w/m2) |
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| 105 | ! Dimensions: (0:nlayers) |
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| 106 | real(kind=rb), intent(out) :: htr(0:) ! longwave heating rate (k/day) |
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| 107 | ! Dimensions: (0:nlayers) |
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| 108 | real(kind=rb), intent(out) :: totuclfl(0:) ! clear sky upward longwave flux (w/m2) |
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| 109 | ! Dimensions: (0:nlayers) |
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| 110 | real(kind=rb), intent(out) :: totdclfl(0:) ! clear sky downward longwave flux (w/m2) |
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| 111 | ! Dimensions: (0:nlayers) |
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| 112 | real(kind=rb), intent(out) :: fnetc(0:) ! clear sky net longwave flux (w/m2) |
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| 113 | ! Dimensions: (0:nlayers) |
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| 114 | real(kind=rb), intent(out) :: htrc(0:) ! clear sky longwave heating rate (k/day) |
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| 115 | ! Dimensions: (0:nlayers) |
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| 116 | real(kind=rb), intent(out) :: dtotuflux_dt(0:) ! change in upward longwave flux (w/m2/k) |
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| 117 | ! with respect to surface temperature |
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| 118 | ! Dimensions: (0:nlayers) |
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| 119 | real(kind=rb), intent(out) :: dtotuclfl_dt(0:) ! change in upward longwave flux (w/m2/k) |
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| 120 | ! with respect to surface temperature |
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| 121 | ! Dimensions: (0:nlayers) |
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| 122 | |
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| 123 | ! ----- Local ----- |
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| 124 | ! Declarations for radiative transfer |
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| 125 | real(kind=rb) :: abscld(nlayers,ngptlw) |
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| 126 | real(kind=rb) :: atot(nlayers) |
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| 127 | real(kind=rb) :: atrans(nlayers) |
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| 128 | real(kind=rb) :: bbugas(nlayers) |
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| 129 | real(kind=rb) :: bbutot(nlayers) |
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| 130 | real(kind=rb) :: clrurad(0:nlayers) |
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| 131 | real(kind=rb) :: clrdrad(0:nlayers) |
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| 132 | real(kind=rb) :: efclfrac(nlayers,ngptlw) |
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| 133 | real(kind=rb) :: uflux(0:nlayers) |
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| 134 | real(kind=rb) :: dflux(0:nlayers) |
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| 135 | real(kind=rb) :: urad(0:nlayers) |
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| 136 | real(kind=rb) :: drad(0:nlayers) |
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| 137 | real(kind=rb) :: uclfl(0:nlayers) |
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| 138 | real(kind=rb) :: dclfl(0:nlayers) |
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| 139 | real(kind=rb) :: odcld(nlayers,ngptlw) |
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| 140 | |
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| 141 | |
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| 142 | real(kind=rb) :: secdiff(nbndlw) ! secant of diffusivity angle |
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| 143 | real(kind=rb) :: a0(nbndlw),a1(nbndlw),a2(nbndlw)! diffusivity angle adjustment coefficients |
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| 144 | real(kind=rb) :: wtdiff, rec_6 |
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| 145 | real(kind=rb) :: transcld, radld, radclrd, plfrac, blay, dplankup, dplankdn |
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| 146 | real(kind=rb) :: odepth, odtot, odepth_rec, odtot_rec, gassrc |
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| 147 | real(kind=rb) :: tblind, tfactot, bbd, bbdtot, tfacgas, transc, tausfac |
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| 148 | real(kind=rb) :: rad0, reflect, radlu, radclru |
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| 149 | |
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| 150 | real(kind=rb) :: duflux_dt(0:nlayers) |
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| 151 | real(kind=rb) :: duclfl_dt(0:nlayers) |
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| 152 | real(kind=rb) :: d_urad_dt(0:nlayers) |
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| 153 | real(kind=rb) :: d_clrurad_dt(0:nlayers) |
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| 154 | real(kind=rb) :: d_rad0_dt, d_radlu_dt, d_radclru_dt |
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| 155 | |
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| 156 | integer(kind=im) :: icldlyr(nlayers) ! flag for cloud in layer |
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| 157 | integer(kind=im) :: ibnd, ib, iband, lay, lev, l, ig ! loop indices |
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| 158 | integer(kind=im) :: igc ! g-point interval counter |
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| 159 | integer(kind=im) :: iclddn ! flag for cloud in down path |
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| 160 | integer(kind=im) :: ittot, itgas, itr ! lookup table indices |
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| 161 | |
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| 162 | ! ------- Definitions ------- |
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| 163 | ! input |
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| 164 | ! nlayers ! number of model layers |
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| 165 | ! ngptlw ! total number of g-point subintervals |
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| 166 | ! nbndlw ! number of longwave spectral bands |
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| 167 | ! ncbands ! number of spectral bands for clouds |
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| 168 | ! secdiff ! diffusivity angle |
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| 169 | ! wtdiff ! weight for radiance to flux conversion |
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| 170 | ! pavel ! layer pressures (mb) |
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| 171 | ! pz ! level (interface) pressures (mb) |
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| 172 | ! tavel ! layer temperatures (k) |
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| 173 | ! tz ! level (interface) temperatures(mb) |
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| 174 | ! tbound ! surface temperature (k) |
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| 175 | ! cldfrac ! layer cloud fraction |
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| 176 | ! taucloud ! layer cloud optical depth |
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| 177 | ! itr ! integer look-up table index |
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| 178 | ! icldlyr ! flag for cloudy layers |
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| 179 | ! iclddn ! flag for cloud in column at any layer |
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| 180 | ! semiss ! surface emissivities for each band |
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| 181 | ! reflect ! surface reflectance |
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| 182 | ! bpade ! 1/(pade constant) |
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| 183 | ! tau_tbl ! clear sky optical depth look-up table |
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| 184 | ! exp_tbl ! exponential look-up table for transmittance |
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| 185 | ! tfn_tbl ! tau transition function look-up table |
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| 186 | |
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| 187 | ! local |
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| 188 | ! atrans ! gaseous absorptivity |
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| 189 | ! abscld ! cloud absorptivity |
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| 190 | ! atot ! combined gaseous and cloud absorptivity |
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| 191 | ! odclr ! clear sky (gaseous) optical depth |
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| 192 | ! odcld ! cloud optical depth |
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| 193 | ! odtot ! optical depth of gas and cloud |
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| 194 | ! tfacgas ! gas-only pade factor, used for planck fn |
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| 195 | ! tfactot ! gas and cloud pade factor, used for planck fn |
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| 196 | ! bbdgas ! gas-only planck function for downward rt |
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| 197 | ! bbugas ! gas-only planck function for upward rt |
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| 198 | ! bbdtot ! gas and cloud planck function for downward rt |
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| 199 | ! bbutot ! gas and cloud planck function for upward calc. |
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| 200 | ! gassrc ! source radiance due to gas only |
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| 201 | ! efclfrac ! effective cloud fraction |
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| 202 | ! radlu ! spectrally summed upward radiance |
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| 203 | ! radclru ! spectrally summed clear sky upward radiance |
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| 204 | ! urad ! upward radiance by layer |
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| 205 | ! clrurad ! clear sky upward radiance by layer |
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| 206 | ! radld ! spectrally summed downward radiance |
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| 207 | ! radclrd ! spectrally summed clear sky downward radiance |
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| 208 | ! drad ! downward radiance by layer |
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| 209 | ! clrdrad ! clear sky downward radiance by layer |
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| 210 | ! d_radlu_dt ! spectrally summed upward radiance |
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| 211 | ! d_radclru_dt ! spectrally summed clear sky upward radiance |
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| 212 | ! d_urad_dt ! upward radiance by layer |
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| 213 | ! d_clrurad_dt ! clear sky upward radiance by layer |
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| 214 | |
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| 215 | ! output |
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| 216 | ! totuflux ! upward longwave flux (w/m2) |
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| 217 | ! totdflux ! downward longwave flux (w/m2) |
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| 218 | ! fnet ! net longwave flux (w/m2) |
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| 219 | ! htr ! longwave heating rate (k/day) |
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| 220 | ! totuclfl ! clear sky upward longwave flux (w/m2) |
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| 221 | ! totdclfl ! clear sky downward longwave flux (w/m2) |
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| 222 | ! fnetc ! clear sky net longwave flux (w/m2) |
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| 223 | ! htrc ! clear sky longwave heating rate (k/day) |
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| 224 | ! dtotuflux_dt ! change in upward longwave flux (w/m2/k) |
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| 225 | ! ! with respect to surface temperature |
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| 226 | ! dtotuclfl_dt ! change in clear sky upward longwave flux (w/m2/k) |
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| 227 | ! ! with respect to surface temperature |
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| 228 | |
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| 229 | |
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| 230 | ! This secant and weight corresponds to the standard diffusivity |
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| 231 | ! angle. This initial value is redefined below for some bands. |
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| 232 | data wtdiff /0.5_rb/ |
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| 233 | data rec_6 /0.166667_rb/ |
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| 234 | |
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| 235 | ! Reset diffusivity angle for Bands 2-3 and 5-9 to vary (between 1.50 |
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| 236 | ! and 1.80) as a function of total column water vapor. The function |
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| 237 | ! has been defined to minimize flux and cooling rate errors in these bands |
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| 238 | ! over a wide range of precipitable water values. |
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| 239 | data a0 / 1.66_rb, 1.55_rb, 1.58_rb, 1.66_rb, & |
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| 240 | 1.54_rb, 1.454_rb, 1.89_rb, 1.33_rb, & |
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| 241 | 1.668_rb, 1.66_rb, 1.66_rb, 1.66_rb, & |
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| 242 | 1.66_rb, 1.66_rb, 1.66_rb, 1.66_rb / |
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| 243 | data a1 / 0.00_rb, 0.25_rb, 0.22_rb, 0.00_rb, & |
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| 244 | 0.13_rb, 0.446_rb, -0.10_rb, 0.40_rb, & |
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| 245 | -0.006_rb, 0.00_rb, 0.00_rb, 0.00_rb, & |
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| 246 | 0.00_rb, 0.00_rb, 0.00_rb, 0.00_rb / |
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| 247 | data a2 / 0.00_rb, -12.0_rb, -11.7_rb, 0.00_rb, & |
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| 248 | -0.72_rb,-0.243_rb, 0.19_rb,-0.062_rb, & |
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| 249 | 0.414_rb, 0.00_rb, 0.00_rb, 0.00_rb, & |
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| 250 | 0.00_rb, 0.00_rb, 0.00_rb, 0.00_rb / |
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| 251 | |
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| 252 | hvrrtc = '$Revision: 1.7 $' |
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| 253 | |
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| 254 | do ibnd = 1,nbndlw |
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| 255 | if (ibnd.eq.1 .or. ibnd.eq.4 .or. ibnd.ge.10) then |
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| 256 | secdiff(ibnd) = 1.66_rb |
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| 257 | else |
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| 258 | secdiff(ibnd) = a0(ibnd) + a1(ibnd)*exp(a2(ibnd)*pwvcm) |
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| 259 | if (secdiff(ibnd) .gt. 1.80_rb) secdiff(ibnd) = 1.80_rb |
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| 260 | if (secdiff(ibnd) .lt. 1.50_rb) secdiff(ibnd) = 1.50_rb |
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| 261 | endif |
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| 262 | enddo |
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| 263 | |
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| 264 | urad(0) = 0.0_rb |
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| 265 | drad(0) = 0.0_rb |
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| 266 | totuflux(0) = 0.0_rb |
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| 267 | totdflux(0) = 0.0_rb |
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| 268 | clrurad(0) = 0.0_rb |
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| 269 | clrdrad(0) = 0.0_rb |
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| 270 | totuclfl(0) = 0.0_rb |
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| 271 | totdclfl(0) = 0.0_rb |
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| 272 | if (idrv .eq. 1) then |
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| 273 | d_urad_dt(0) = 0.0_rb |
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| 274 | d_clrurad_dt(0) = 0.0_rb |
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| 275 | dtotuflux_dt(0) = 0.0_rb |
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| 276 | dtotuclfl_dt(0) = 0.0_rb |
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| 277 | endif |
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| 278 | |
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| 279 | do lay = 1, nlayers |
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| 280 | urad(lay) = 0.0_rb |
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| 281 | drad(lay) = 0.0_rb |
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| 282 | totuflux(lay) = 0.0_rb |
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| 283 | totdflux(lay) = 0.0_rb |
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| 284 | clrurad(lay) = 0.0_rb |
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| 285 | clrdrad(lay) = 0.0_rb |
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| 286 | totuclfl(lay) = 0.0_rb |
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| 287 | totdclfl(lay) = 0.0_rb |
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| 288 | icldlyr(lay) = 0 |
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| 289 | if (idrv .eq. 1) then |
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| 290 | d_urad_dt(lay) = 0.0_rb |
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| 291 | d_clrurad_dt(lay) = 0.0_rb |
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| 292 | dtotuflux_dt(lay) = 0.0_rb |
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| 293 | dtotuclfl_dt(lay) = 0.0_rb |
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| 294 | endif |
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| 295 | |
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| 296 | ! Change to band loop? |
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| 297 | do ig = 1, ngptlw |
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| 298 | if (cldfmc(ig,lay) .eq. 1._rb) then |
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| 299 | ib = ngb(ig) |
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| 300 | odcld(lay,ig) = secdiff(ib) * taucmc(ig,lay) |
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| 301 | transcld = exp(-odcld(lay,ig)) |
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| 302 | abscld(lay,ig) = 1._rb - transcld |
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| 303 | efclfrac(lay,ig) = abscld(lay,ig) * cldfmc(ig,lay) |
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| 304 | icldlyr(lay) = 1 |
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| 305 | else |
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| 306 | odcld(lay,ig) = 0.0_rb |
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| 307 | abscld(lay,ig) = 0.0_rb |
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| 308 | efclfrac(lay,ig) = 0.0_rb |
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| 309 | endif |
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| 310 | enddo |
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| 311 | |
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| 312 | enddo |
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| 313 | |
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| 314 | igc = 1 |
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| 315 | ! Loop over frequency bands. |
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| 316 | do iband = istart, iend |
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| 317 | |
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| 318 | ! Reinitialize g-point counter for each band if output for each band is requested. |
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| 319 | if (iout.gt.0.and.iband.ge.2) igc = ngs(iband-1)+1 |
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| 320 | |
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| 321 | ! Loop over g-channels. |
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| 322 | 1000 continue |
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| 323 | |
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| 324 | ! Radiative transfer starts here. |
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| 325 | radld = 0._rb |
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| 326 | radclrd = 0._rb |
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| 327 | iclddn = 0 |
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| 328 | |
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| 329 | ! Downward radiative transfer loop. |
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| 330 | |
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| 331 | do lev = nlayers, 1, -1 |
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| 332 | plfrac = fracs(lev,igc) |
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| 333 | blay = planklay(lev,iband) |
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| 334 | dplankup = planklev(lev,iband) - blay |
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| 335 | dplankdn = planklev(lev-1,iband) - blay |
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| 336 | odepth = secdiff(iband) * taut(lev,igc) |
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| 337 | if (odepth .lt. 0.0_rb) odepth = 0.0_rb |
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| 338 | ! Cloudy layer |
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| 339 | if (icldlyr(lev).eq.1) then |
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| 340 | iclddn = 1 |
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| 341 | odtot = odepth + odcld(lev,igc) |
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| 342 | if (odtot .lt. 0.06_rb) then |
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| 343 | atrans(lev) = odepth - 0.5_rb*odepth*odepth |
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| 344 | odepth_rec = rec_6*odepth |
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| 345 | gassrc = plfrac*(blay+dplankdn*odepth_rec)*atrans(lev) |
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| 346 | |
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| 347 | atot(lev) = odtot - 0.5_rb*odtot*odtot |
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| 348 | odtot_rec = rec_6*odtot |
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| 349 | bbdtot = plfrac * (blay+dplankdn*odtot_rec) |
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| 350 | bbd = plfrac*(blay+dplankdn*odepth_rec) |
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| 351 | radld = radld - radld * (atrans(lev) + & |
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| 352 | efclfrac(lev,igc) * (1. - atrans(lev))) + & |
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| 353 | gassrc + cldfmc(igc,lev) * & |
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| 354 | (bbdtot * atot(lev) - gassrc) |
|---|
| 355 | drad(lev-1) = drad(lev-1) + radld |
|---|
| 356 | |
|---|
| 357 | bbugas(lev) = plfrac * (blay+dplankup*odepth_rec) |
|---|
| 358 | bbutot(lev) = plfrac * (blay+dplankup*odtot_rec) |
|---|
| 359 | |
|---|
| 360 | elseif (odepth .le. 0.06_rb) then |
|---|
| 361 | atrans(lev) = odepth - 0.5_rb*odepth*odepth |
|---|
| 362 | odepth_rec = rec_6*odepth |
|---|
| 363 | gassrc = plfrac*(blay+dplankdn*odepth_rec)*atrans(lev) |
|---|
| 364 | |
|---|
| 365 | odtot = odepth + odcld(lev,igc) |
|---|
| 366 | tblind = odtot/(bpade+odtot) |
|---|
| 367 | ittot = tblint*tblind + 0.5_rb |
|---|
| 368 | tfactot = tfn_tbl(ittot) |
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| 369 | bbdtot = plfrac * (blay + tfactot*dplankdn) |
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| 370 | bbd = plfrac*(blay+dplankdn*odepth_rec) |
|---|
| 371 | atot(lev) = 1. - exp_tbl(ittot) |
|---|
| 372 | |
|---|
| 373 | radld = radld - radld * (atrans(lev) + & |
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| 374 | efclfrac(lev,igc) * (1._rb - atrans(lev))) + & |
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| 375 | gassrc + cldfmc(igc,lev) * & |
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| 376 | (bbdtot * atot(lev) - gassrc) |
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| 377 | drad(lev-1) = drad(lev-1) + radld |
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| 378 | |
|---|
| 379 | bbugas(lev) = plfrac * (blay + dplankup*odepth_rec) |
|---|
| 380 | bbutot(lev) = plfrac * (blay + tfactot * dplankup) |
|---|
| 381 | |
|---|
| 382 | else |
|---|
| 383 | |
|---|
| 384 | tblind = odepth/(bpade+odepth) |
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| 385 | itgas = tblint*tblind+0.5_rb |
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| 386 | odepth = tau_tbl(itgas) |
|---|
| 387 | atrans(lev) = 1._rb - exp_tbl(itgas) |
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| 388 | tfacgas = tfn_tbl(itgas) |
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| 389 | gassrc = atrans(lev) * plfrac * (blay + tfacgas*dplankdn) |
|---|
| 390 | |
|---|
| 391 | odtot = odepth + odcld(lev,igc) |
|---|
| 392 | tblind = odtot/(bpade+odtot) |
|---|
| 393 | ittot = tblint*tblind + 0.5_rb |
|---|
| 394 | tfactot = tfn_tbl(ittot) |
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| 395 | bbdtot = plfrac * (blay + tfactot*dplankdn) |
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| 396 | bbd = plfrac*(blay+tfacgas*dplankdn) |
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| 397 | atot(lev) = 1._rb - exp_tbl(ittot) |
|---|
| 398 | |
|---|
| 399 | radld = radld - radld * (atrans(lev) + & |
|---|
| 400 | efclfrac(lev,igc) * (1._rb - atrans(lev))) + & |
|---|
| 401 | gassrc + cldfmc(igc,lev) * & |
|---|
| 402 | (bbdtot * atot(lev) - gassrc) |
|---|
| 403 | drad(lev-1) = drad(lev-1) + radld |
|---|
| 404 | bbugas(lev) = plfrac * (blay + tfacgas * dplankup) |
|---|
| 405 | bbutot(lev) = plfrac * (blay + tfactot * dplankup) |
|---|
| 406 | endif |
|---|
| 407 | ! Clear layer |
|---|
| 408 | else |
|---|
| 409 | if (odepth .le. 0.06_rb) then |
|---|
| 410 | atrans(lev) = odepth-0.5_rb*odepth*odepth |
|---|
| 411 | odepth = rec_6*odepth |
|---|
| 412 | bbd = plfrac*(blay+dplankdn*odepth) |
|---|
| 413 | bbugas(lev) = plfrac*(blay+dplankup*odepth) |
|---|
| 414 | else |
|---|
| 415 | tblind = odepth/(bpade+odepth) |
|---|
| 416 | itr = tblint*tblind+0.5_rb |
|---|
| 417 | transc = exp_tbl(itr) |
|---|
| 418 | atrans(lev) = 1._rb-transc |
|---|
| 419 | tausfac = tfn_tbl(itr) |
|---|
| 420 | bbd = plfrac*(blay+tausfac*dplankdn) |
|---|
| 421 | bbugas(lev) = plfrac * (blay + tausfac * dplankup) |
|---|
| 422 | endif |
|---|
| 423 | radld = radld + (bbd-radld)*atrans(lev) |
|---|
| 424 | drad(lev-1) = drad(lev-1) + radld |
|---|
| 425 | endif |
|---|
| 426 | ! Set clear sky stream to total sky stream as long as layers |
|---|
| 427 | ! remain clear. Streams diverge when a cloud is reached (iclddn=1), |
|---|
| 428 | ! and clear sky stream must be computed separately from that point. |
|---|
| 429 | if (iclddn.eq.1) then |
|---|
| 430 | radclrd = radclrd + (bbd-radclrd) * atrans(lev) |
|---|
| 431 | clrdrad(lev-1) = clrdrad(lev-1) + radclrd |
|---|
| 432 | else |
|---|
| 433 | radclrd = radld |
|---|
| 434 | clrdrad(lev-1) = drad(lev-1) |
|---|
| 435 | endif |
|---|
| 436 | enddo |
|---|
| 437 | |
|---|
| 438 | ! Spectral emissivity & reflectance |
|---|
| 439 | ! Include the contribution of spectrally varying longwave emissivity |
|---|
| 440 | ! and reflection from the surface to the upward radiative transfer. |
|---|
| 441 | ! Note: Spectral and Lambertian reflection are identical for the |
|---|
| 442 | ! diffusivity angle flux integration used here. |
|---|
| 443 | ! Note: The emissivity is applied to plankbnd and dplankbnd_dt when |
|---|
| 444 | ! they are defined in subroutine setcoef. |
|---|
| 445 | |
|---|
| 446 | rad0 = fracs(1,igc) * plankbnd(iband) |
|---|
| 447 | if (idrv .eq. 1) then |
|---|
| 448 | d_rad0_dt = fracs(1,igc) * dplankbnd_dt(iband) |
|---|
| 449 | endif |
|---|
| 450 | |
|---|
| 451 | ! Add in specular reflection of surface downward radiance. |
|---|
| 452 | reflect = 1._rb - semiss(iband) |
|---|
| 453 | radlu = rad0 + reflect * radld |
|---|
| 454 | radclru = rad0 + reflect * radclrd |
|---|
| 455 | |
|---|
| 456 | |
|---|
| 457 | ! Upward radiative transfer loop. |
|---|
| 458 | urad(0) = urad(0) + radlu |
|---|
| 459 | clrurad(0) = clrurad(0) + radclru |
|---|
| 460 | if (idrv .eq. 1) then |
|---|
| 461 | d_radlu_dt = d_rad0_dt |
|---|
| 462 | d_urad_dt(0) = d_urad_dt(0) + d_radlu_dt |
|---|
| 463 | d_radclru_dt = d_rad0_dt |
|---|
| 464 | d_clrurad_dt(0) = d_clrurad_dt(0) + d_radclru_dt |
|---|
| 465 | endif |
|---|
| 466 | |
|---|
| 467 | do lev = 1, nlayers |
|---|
| 468 | ! Cloudy layer |
|---|
| 469 | if (icldlyr(lev) .eq. 1) then |
|---|
| 470 | gassrc = bbugas(lev) * atrans(lev) |
|---|
| 471 | radlu = radlu - radlu * (atrans(lev) + & |
|---|
| 472 | efclfrac(lev,igc) * (1._rb - atrans(lev))) + & |
|---|
| 473 | gassrc + cldfmc(igc,lev) * & |
|---|
| 474 | (bbutot(lev) * atot(lev) - gassrc) |
|---|
| 475 | urad(lev) = urad(lev) + radlu |
|---|
| 476 | if (idrv .eq. 1) then |
|---|
| 477 | d_radlu_dt = d_radlu_dt * cldfmc(igc,lev) * (1.0_rb - atot(lev)) + & |
|---|
| 478 | d_radlu_dt * (1.0_rb - cldfmc(igc,lev)) * (1.0_rb - atrans(lev)) |
|---|
| 479 | d_urad_dt(lev) = d_urad_dt(lev) + d_radlu_dt |
|---|
| 480 | endif |
|---|
| 481 | ! Clear layer |
|---|
| 482 | else |
|---|
| 483 | radlu = radlu + (bbugas(lev)-radlu)*atrans(lev) |
|---|
| 484 | urad(lev) = urad(lev) + radlu |
|---|
| 485 | if (idrv .eq. 1) then |
|---|
| 486 | d_radlu_dt = d_radlu_dt * (1.0_rb - atrans(lev)) |
|---|
| 487 | d_urad_dt(lev) = d_urad_dt(lev) + d_radlu_dt |
|---|
| 488 | endif |
|---|
| 489 | endif |
|---|
| 490 | ! Set clear sky stream to total sky stream as long as all layers |
|---|
| 491 | ! are clear (iclddn=0). Streams must be calculated separately at |
|---|
| 492 | ! all layers when a cloud is present (ICLDDN=1), because surface |
|---|
| 493 | ! reflectance is different for each stream. |
|---|
| 494 | if (iclddn.eq.1) then |
|---|
| 495 | radclru = radclru + (bbugas(lev)-radclru)*atrans(lev) |
|---|
| 496 | clrurad(lev) = clrurad(lev) + radclru |
|---|
| 497 | else |
|---|
| 498 | radclru = radlu |
|---|
| 499 | clrurad(lev) = urad(lev) |
|---|
| 500 | endif |
|---|
| 501 | if (idrv .eq. 1) then |
|---|
| 502 | if (iclddn.eq.1) then |
|---|
| 503 | d_radclru_dt = d_radclru_dt * (1.0_rb - atrans(lev)) |
|---|
| 504 | d_clrurad_dt(lev) = d_clrurad_dt(lev) + d_radclru_dt |
|---|
| 505 | else |
|---|
| 506 | d_radclru_dt = d_radlu_dt |
|---|
| 507 | d_clrurad_dt(lev) = d_urad_dt(lev) |
|---|
| 508 | endif |
|---|
| 509 | endif |
|---|
| 510 | enddo |
|---|
| 511 | |
|---|
| 512 | ! Increment g-point counter |
|---|
| 513 | igc = igc + 1 |
|---|
| 514 | ! Return to continue radiative transfer for all g-channels in present band |
|---|
| 515 | if (igc .le. ngs(iband)) go to 1000 |
|---|
| 516 | |
|---|
| 517 | ! Process longwave output from band for total and clear streams. |
|---|
| 518 | ! Calculate upward, downward, and net flux. |
|---|
| 519 | do lev = nlayers, 0, -1 |
|---|
| 520 | uflux(lev) = urad(lev)*wtdiff |
|---|
| 521 | dflux(lev) = drad(lev)*wtdiff |
|---|
| 522 | urad(lev) = 0.0_rb |
|---|
| 523 | drad(lev) = 0.0_rb |
|---|
| 524 | totuflux(lev) = totuflux(lev) + uflux(lev) * delwave(iband) |
|---|
| 525 | totdflux(lev) = totdflux(lev) + dflux(lev) * delwave(iband) |
|---|
| 526 | uclfl(lev) = clrurad(lev)*wtdiff |
|---|
| 527 | dclfl(lev) = clrdrad(lev)*wtdiff |
|---|
| 528 | clrurad(lev) = 0.0_rb |
|---|
| 529 | clrdrad(lev) = 0.0_rb |
|---|
| 530 | totuclfl(lev) = totuclfl(lev) + uclfl(lev) * delwave(iband) |
|---|
| 531 | totdclfl(lev) = totdclfl(lev) + dclfl(lev) * delwave(iband) |
|---|
| 532 | enddo |
|---|
| 533 | |
|---|
| 534 | ! Calculate total change in upward flux wrt surface temperature |
|---|
| 535 | if (idrv .eq. 1) then |
|---|
| 536 | do lev = nlayers, 0, -1 |
|---|
| 537 | duflux_dt(lev) = d_urad_dt(lev) * wtdiff |
|---|
| 538 | d_urad_dt(lev) = 0.0_rb |
|---|
| 539 | dtotuflux_dt(lev) = dtotuflux_dt(lev) + duflux_dt(lev) * delwave(iband) * fluxfac |
|---|
| 540 | duclfl_dt(lev) = d_clrurad_dt(lev) * wtdiff |
|---|
| 541 | d_clrurad_dt(lev) = 0.0_rb |
|---|
| 542 | dtotuclfl_dt(lev) = dtotuclfl_dt(lev) + duclfl_dt(lev) * delwave(iband) * fluxfac |
|---|
| 543 | enddo |
|---|
| 544 | endif |
|---|
| 545 | |
|---|
| 546 | ! End spectral band loop |
|---|
| 547 | enddo |
|---|
| 548 | |
|---|
| 549 | ! Calculate fluxes at surface |
|---|
| 550 | totuflux(0) = totuflux(0) * fluxfac |
|---|
| 551 | totdflux(0) = totdflux(0) * fluxfac |
|---|
| 552 | fnet(0) = totuflux(0) - totdflux(0) |
|---|
| 553 | totuclfl(0) = totuclfl(0) * fluxfac |
|---|
| 554 | totdclfl(0) = totdclfl(0) * fluxfac |
|---|
| 555 | fnetc(0) = totuclfl(0) - totdclfl(0) |
|---|
| 556 | |
|---|
| 557 | ! Calculate fluxes at model levels |
|---|
| 558 | do lev = 1, nlayers |
|---|
| 559 | totuflux(lev) = totuflux(lev) * fluxfac |
|---|
| 560 | totdflux(lev) = totdflux(lev) * fluxfac |
|---|
| 561 | fnet(lev) = totuflux(lev) - totdflux(lev) |
|---|
| 562 | totuclfl(lev) = totuclfl(lev) * fluxfac |
|---|
| 563 | totdclfl(lev) = totdclfl(lev) * fluxfac |
|---|
| 564 | fnetc(lev) = totuclfl(lev) - totdclfl(lev) |
|---|
| 565 | l = lev - 1 |
|---|
| 566 | |
|---|
| 567 | ! Calculate heating rates at model layers |
|---|
| 568 | htr(l)=heatfac*(fnet(l)-fnet(lev))/(pz(l)-pz(lev)) |
|---|
| 569 | htrc(l)=heatfac*(fnetc(l)-fnetc(lev))/(pz(l)-pz(lev)) |
|---|
| 570 | enddo |
|---|
| 571 | |
|---|
| 572 | ! Set heating rate to zero in top layer |
|---|
| 573 | htr(nlayers) = 0.0_rb |
|---|
| 574 | htrc(nlayers) = 0.0_rb |
|---|
| 575 | |
|---|
| 576 | end subroutine rtrnmc |
|---|
| 577 | |
|---|
| 578 | end module rrtmg_lw_rtrnmc |
|---|
| 579 | |
|---|
