| [1585] | 1 | ! path: $Source: /storm/rc1/cvsroot/rc/rrtmg_lw/src/rrtmg_lw_rad.nomcica.f90,v $ |
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| 2 | ! author: $Author: miacono $ |
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| 3 | ! revision: $Revision: 1.12 $ |
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| 4 | ! created: $Date: 2011/04/08 20:25:01 $ |
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| 5 | ! |
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| 6 | |
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| 7 | module rrtmg_lw_rad |
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| 8 | |
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| 9 | ! -------------------------------------------------------------------------- |
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| 10 | ! | | |
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| 11 | ! | Copyright 2002-2009, Atmospheric & Environmental Research, Inc. (AER). | |
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| 12 | ! | This software may be used, copied, or redistributed as long as it is | |
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| 13 | ! | not sold and this copyright notice is reproduced on each copy made. | |
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| 14 | ! | This model is provided as is without any express or implied warranties. | |
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| 15 | ! | (http://www.rtweb.aer.com/) | |
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| 16 | ! | | |
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| 17 | ! -------------------------------------------------------------------------- |
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| 18 | ! |
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| 19 | ! **************************************************************************** |
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| 20 | ! * * |
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| 21 | ! * RRTMG_LW * |
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| 22 | ! * * |
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| 23 | ! * * |
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| 24 | ! * * |
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| 25 | ! * a rapid radiative transfer model * |
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| 26 | ! * for the longwave region * |
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| 27 | ! * for application to general circulation models * |
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| 28 | ! * * |
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| 29 | ! * * |
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| 30 | ! * Atmospheric and Environmental Research, Inc. * |
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| 31 | ! * 131 Hartwell Avenue * |
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| 32 | ! * Lexington, MA 02421 * |
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| 33 | ! * * |
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| 34 | ! * * |
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| 35 | ! * Eli J. Mlawer * |
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| 36 | ! * Jennifer S. Delamere * |
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| 37 | ! * Michael J. Iacono * |
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| 38 | ! * Shepard A. Clough * |
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| 39 | ! * * |
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| 40 | ! * * |
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| 41 | ! * * |
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| 42 | ! * * |
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| 43 | ! * * |
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| 44 | ! * * |
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| 45 | ! * email: emlawer@aer.com * |
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| 46 | ! * email: jdelamer@aer.com * |
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| 47 | ! * email: miacono@aer.com * |
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| 48 | ! * * |
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| 49 | ! * The authors wish to acknowledge the contributions of the * |
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| 50 | ! * following people: Steven J. Taubman, Karen Cady-Pereira, * |
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| 51 | ! * Patrick D. Brown, Ronald E. Farren, Luke Chen, Robert Bergstrom. * |
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| 52 | ! * * |
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| 53 | ! **************************************************************************** |
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| 54 | |
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| 55 | ! -------- Modules -------- |
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| 56 | use parkind, only : im => kind_im, rb => kind_rb |
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| 57 | use rrlw_vsn |
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| 58 | use rrtmg_lw_cldprop, only: cldprop |
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| 59 | ! *** Move the required call to rrtmg_lw_ini below and the following |
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| 60 | ! use association to the GCM initialization area *** |
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| 61 | ! use rrtmg_lw_init, only: rrtmg_lw_ini |
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| 62 | use rrtmg_lw_rtrn, only: rtrn |
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| 63 | use rrtmg_lw_rtrnmr, only: rtrnmr |
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| 64 | use rrtmg_lw_setcoef, only: setcoef |
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| 65 | use rrtmg_lw_taumol, only: taumol |
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| 66 | |
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| 67 | implicit none |
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| 68 | |
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| 69 | ! public interfaces/functions/subroutines |
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| 70 | public :: rrtmg_lw, inatm |
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| 71 | |
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| 72 | !------------------------------------------------------------------ |
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| 73 | contains |
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| 74 | !------------------------------------------------------------------ |
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| 75 | |
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| 76 | !------------------------------------------------------------------ |
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| 77 | ! Public subroutines |
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| 78 | !------------------------------------------------------------------ |
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| 79 | |
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| 80 | subroutine rrtmg_lw & |
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| 81 | (ncol ,nlay ,icld ,idrv , & |
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| 82 | play ,plev ,tlay ,tlev ,tsfc , & |
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| 83 | h2ovmr ,o3vmr ,co2vmr ,ch4vmr ,n2ovmr ,o2vmr, & |
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| 84 | cfc11vmr,cfc12vmr,cfc22vmr,ccl4vmr ,emis , & |
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| 85 | inflglw ,iceflglw,liqflglw,cldfr , & |
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| 86 | taucld ,cicewp ,cliqwp ,reice ,reliq , & |
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| 87 | tauaer , & |
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| 88 | uflx ,dflx ,hr ,uflxc ,dflxc, hrc, & |
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| 89 | duflx_dt,duflxc_dt ) |
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| 90 | |
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| 91 | ! -------- Description -------- |
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| 92 | |
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| 93 | ! This program is the driver subroutine for RRTMG_LW, the AER LW radiation |
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| 94 | ! model for application to GCMs, that has been adapted from RRTM_LW for |
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| 95 | ! improved efficiency. |
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| 96 | ! |
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| 97 | ! NOTE: The call to RRTMG_LW_INI should be moved to the GCM initialization |
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| 98 | ! area, since this has to be called only once. |
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| 99 | ! |
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| 100 | ! This routine: |
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| 101 | ! a) calls INATM to read in the atmospheric profile from GCM; |
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| 102 | ! all layering in RRTMG is ordered from surface to toa. |
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| 103 | ! b) calls CLDPROP to set cloud optical depth based on input |
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| 104 | ! cloud properties |
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| 105 | ! c) calls SETCOEF to calculate various quantities needed for |
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| 106 | ! the radiative transfer algorithm |
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| 107 | ! d) calls TAUMOL to calculate gaseous optical depths for each |
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| 108 | ! of the 16 spectral bands |
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| 109 | ! e) calls RTRNMR (for both clear and cloudy profiles) to perform the |
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| 110 | ! radiative transfer calculation with a maximum-random cloud |
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| 111 | ! overlap method, or calls RTRN to use random cloud overlap. |
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| 112 | ! f) passes the necessary fluxes and cooling rates back to GCM |
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| 113 | ! |
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| 114 | ! Two modes of operation are possible: |
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| 115 | ! The mode is chosen by using either rrtmg_lw.nomcica.f90 (to not use |
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| 116 | ! McICA) or rrtmg_lw.f90 (to use McICA) to interface with a GCM. |
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| 117 | ! |
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| 118 | ! 1) Standard, single forward model calculation (imca = 0) |
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| 119 | ! 2) Monte Carlo Independent Column Approximation (McICA, Pincus et al., |
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| 120 | ! JC, 2003) method is applied to the forward model calculation (imca = 1) |
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| 121 | ! |
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| 122 | ! Two methods of cloud property input are possible: |
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| 123 | ! Cloud properties can be input in one of two ways (controlled by input |
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| 124 | ! flags inflglw, iceflglw, and liqflglw; see text file rrtmg_lw_instructions |
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| 125 | ! and subroutine rrtmg_lw_cldprop.f90 for further details): |
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| 126 | ! |
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| 127 | ! 1) Input cloud fraction and cloud optical depth directly (inflglw = 0) |
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| 128 | ! 2) Input cloud fraction and cloud physical properties (inflglw = 1 or 2); |
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| 129 | ! cloud optical properties are calculated by cldprop or cldprmc based |
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| 130 | ! on input settings of iceflglw and liqflglw. Ice particle size provided |
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| 131 | ! must be appropriately defined for the ice parameterization selected. |
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| 132 | ! |
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| 133 | ! One method of aerosol property input is possible: |
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| 134 | ! Aerosol properties can be input in only one way (controlled by input |
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| 135 | ! flag iaer; see text file rrtmg_lw_instructions for further details): |
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| 136 | ! |
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| 137 | ! 1) Input aerosol optical depth directly by layer and spectral band (iaer=10); |
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| 138 | ! band average optical depth at the mid-point of each spectral band. |
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| 139 | ! RRTMG_LW currently treats only aerosol absorption; |
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| 140 | ! scattering capability is not presently available. |
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| 141 | ! |
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| 142 | ! The optional calculation of the change in upward flux as a function of surface |
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| 143 | ! temperature is available (controlled by input flag idrv). This can be utilized |
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| 144 | ! to approximate adjustments to the upward flux profile caused only by a change in |
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| 145 | ! surface temperature between full radiation calls. This feature uses the pre- |
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| 146 | ! calculated derivative of the Planck function with respect to surface temperature. |
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| 147 | ! |
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| 148 | ! 1) Normal forward calculation for the input profile (idrv=0) |
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| 149 | ! 2) Normal forward calculation with optional calculation of the change |
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| 150 | ! in upward flux as a function of surface temperature for clear sky |
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| 151 | ! and total sky flux. Flux partial derivatives are provided in arrays |
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| 152 | ! duflx_dt and duflxc_dt for total and clear sky. (idrv=1) |
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| 153 | ! |
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| 154 | ! |
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| 155 | ! ------- Modifications ------- |
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| 156 | ! |
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| 157 | ! This version of RRTMG_LW has been modified from RRTM_LW to use a reduced |
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| 158 | ! set of g-points for application to GCMs. |
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| 159 | ! |
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| 160 | !-- Original version (derived from RRTM_LW), reduction of g-points, other |
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| 161 | ! revisions for use with GCMs. |
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| 162 | ! 1999: M. J. Iacono, AER, Inc. |
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| 163 | !-- Adapted for use with NCAR/CAM. |
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| 164 | ! May 2004: M. J. Iacono, AER, Inc. |
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| 165 | !-- Conversion to F90 formatting for consistency with rrtmg_sw. |
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| 166 | ! Feb 2007: M. J. Iacono, AER, Inc. |
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| 167 | !-- Modifications to formatting to use assumed-shape arrays. |
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| 168 | ! Aug 2007: M. J. Iacono, AER, Inc. |
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| 169 | !-- Modified to add longwave aerosol absorption. |
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| 170 | ! Apr 2008: M. J. Iacono, AER, Inc. |
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| 171 | !-- Added capability to calculate derivative of upward flux wrt surface temperature. |
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| 172 | ! Nov 2009: M. J. Iacono, E. J. Mlawer, AER, Inc. |
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| 173 | |
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| 174 | ! --------- Modules ---------- |
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| 175 | |
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| 176 | use parrrtm, only : nbndlw, ngptlw, maxxsec, mxmol |
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| 177 | use rrlw_con, only: fluxfac, heatfac, oneminus, pi |
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| 178 | use rrlw_wvn, only: ng, ngb, nspa, nspb, wavenum1, wavenum2, delwave |
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| 179 | |
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| 180 | ! ------- Declarations ------- |
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| 181 | |
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| 182 | ! ----- Input ----- |
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| 183 | ! Note: All volume mixing ratios are in dimensionless units of mole fraction obtained |
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| 184 | ! by scaling mass mixing ratio (g/g) with the appropriate molecular weights (g/mol) |
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| 185 | integer(kind=im), intent(in) :: ncol ! Number of horizontal columns |
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| 186 | integer(kind=im), intent(in) :: nlay ! Number of model layers |
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| 187 | integer(kind=im), intent(inout) :: icld ! Cloud overlap method |
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| 188 | ! 0: Clear only |
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| 189 | ! 1: Random |
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| 190 | ! 2: Maximum/random |
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| 191 | ! 3: Maximum |
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| 192 | integer(kind=im), intent(in) :: idrv ! Flag for calculation of dFdT, the change |
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| 193 | ! in upward flux as a function of |
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| 194 | ! surface temperature [0=off, 1=on] |
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| 195 | ! 0: Normal forward calculation |
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| 196 | ! 1: Normal forward calculation with |
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| 197 | ! duflx_dt and duflxc_dt output |
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| 198 | |
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| 199 | real(kind=rb), intent(in) :: play(:,:) ! Layer pressures (hPa, mb) |
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| 200 | ! Dimensions: (ncol,nlay) |
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| 201 | real(kind=rb), intent(in) :: plev(:,:) ! Interface pressures (hPa, mb) |
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| 202 | ! Dimensions: (ncol,nlay+1) |
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| 203 | real(kind=rb), intent(in) :: tlay(:,:) ! Layer temperatures (K) |
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| 204 | ! Dimensions: (ncol,nlay) |
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| 205 | real(kind=rb), intent(in) :: tlev(:,:) ! Interface temperatures (K) |
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| 206 | ! Dimensions: (ncol,nlay+1) |
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| 207 | real(kind=rb), intent(in) :: tsfc(:) ! Surface temperature (K) |
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| 208 | ! Dimensions: (ncol) |
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| 209 | real(kind=rb), intent(in) :: h2ovmr(:,:) ! H2O volume mixing ratio |
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| 210 | ! Dimensions: (ncol,nlay) |
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| 211 | real(kind=rb), intent(in) :: o3vmr(:,:) ! O3 volume mixing ratio |
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| 212 | ! Dimensions: (ncol,nlay) |
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| 213 | real(kind=rb), intent(in) :: co2vmr(:,:) ! CO2 volume mixing ratio |
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| 214 | ! Dimensions: (ncol,nlay) |
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| 215 | real(kind=rb), intent(in) :: ch4vmr(:,:) ! Methane volume mixing ratio |
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| 216 | ! Dimensions: (ncol,nlay) |
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| 217 | real(kind=rb), intent(in) :: n2ovmr(:,:) ! Nitrous oxide volume mixing ratio |
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| 218 | ! Dimensions: (ncol,nlay) |
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| 219 | real(kind=rb), intent(in) :: o2vmr(:,:) ! Oxygen volume mixing ratio |
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| 220 | ! Dimensions: (ncol,nlay) |
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| 221 | real(kind=rb), intent(in) :: cfc11vmr(:,:) ! CFC11 volume mixing ratio |
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| 222 | ! Dimensions: (ncol,nlay) |
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| 223 | real(kind=rb), intent(in) :: cfc12vmr(:,:) ! CFC12 volume mixing ratio |
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| 224 | ! Dimensions: (ncol,nlay) |
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| 225 | real(kind=rb), intent(in) :: cfc22vmr(:,:) ! CFC22 volume mixing ratio |
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| 226 | ! Dimensions: (ncol,nlay) |
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| 227 | real(kind=rb), intent(in) :: ccl4vmr(:,:) ! CCL4 volume mixing ratio |
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| 228 | ! Dimensions: (ncol,nlay) |
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| 229 | real(kind=rb), intent(in) :: emis(:,:) ! Surface emissivity |
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| 230 | ! Dimensions: (ncol,nbndlw) |
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| 231 | |
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| 232 | integer(kind=im), intent(in) :: inflglw ! Flag for cloud optical properties |
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| 233 | integer(kind=im), intent(in) :: iceflglw ! Flag for ice particle specification |
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| 234 | integer(kind=im), intent(in) :: liqflglw ! Flag for liquid droplet specification |
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| 235 | |
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| 236 | real(kind=rb), intent(in) :: cldfr(:,:) ! Cloud fraction |
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| 237 | ! Dimensions: (ncol,nlay) |
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| 238 | real(kind=rb), intent(in) :: cicewp(:,:) ! Cloud ice water path (g/m2) |
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| 239 | ! Dimensions: (ncol,nlay) |
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| 240 | real(kind=rb), intent(in) :: cliqwp(:,:) ! Cloud liquid water path (g/m2) |
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| 241 | ! Dimensions: (ncol,nlay) |
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| 242 | real(kind=rb), intent(in) :: reice(:,:) ! Cloud ice particle effective size (microns) |
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| 243 | ! Dimensions: (ncol,nlay) |
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| 244 | ! specific definition of reice depends on setting of iceflglw: |
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| 245 | ! iceflglw = 0: ice effective radius, r_ec, (Ebert and Curry, 1992), |
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| 246 | ! r_ec must be >= 10.0 microns |
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| 247 | ! iceflglw = 1: ice effective radius, r_ec, (Ebert and Curry, 1992), |
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| 248 | ! r_ec range is limited to 13.0 to 130.0 microns |
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| 249 | ! iceflglw = 2: ice effective radius, r_k, (Key, Streamer Ref. Manual, 1996) |
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| 250 | ! r_k range is limited to 5.0 to 131.0 microns |
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| 251 | ! iceflglw = 3: generalized effective size, dge, (Fu, 1996), |
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| 252 | ! dge range is limited to 5.0 to 140.0 microns |
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| 253 | ! [dge = 1.0315 * r_ec] |
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| 254 | real(kind=rb), intent(in) :: reliq(:,:) ! Cloud water drop effective radius (microns) |
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| 255 | ! Dimensions: (ncol,nlay) |
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| 256 | real(kind=rb), intent(in) :: taucld(:,:,:) ! In-cloud optical depth |
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| 257 | ! Dimensions: (nbndlw,ncol,nlay) |
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| 258 | ! real(kind=rb), intent(in) :: ssacld(:,:,:) ! In-cloud single scattering albedo |
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| 259 | ! Dimensions: (nbndlw,ncol,nlay) |
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| 260 | ! for future expansion |
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| 261 | ! (lw scattering not yet available) |
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| 262 | ! real(kind=rb), intent(in) :: asmcld(:,:,:) ! In-cloud asymmetry parameter |
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| 263 | ! Dimensions: (nbndlw,ncol,nlay) |
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| 264 | ! for future expansion |
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| 265 | ! (lw scattering not yet available) |
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| 266 | real(kind=rb), intent(in) :: tauaer(:,:,:) ! aerosol optical depth |
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| 267 | ! Dimensions: (ncol,nlay,nbndlw) |
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| 268 | ! real(kind=rb), intent(in) :: ssaaer(:,:,:) ! aerosol single scattering albedo |
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| 269 | ! Dimensions: (ncol,nlay,nbndlw) |
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| 270 | ! for future expansion |
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| 271 | ! (lw aerosols/scattering not yet available) |
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| 272 | ! real(kind=rb), intent(in) :: asmaer(:,:,:) ! aerosol asymmetry parameter |
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| 273 | ! Dimensions: (ncol,nlay,nbndlw) |
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| 274 | ! for future expansion |
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| 275 | ! (lw aerosols/scattering not yet available) |
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| 276 | |
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| 277 | |
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| 278 | ! ----- Output ----- |
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| 279 | |
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| 280 | real(kind=rb), intent(out) :: uflx(:,:) ! Total sky longwave upward flux (W/m2) |
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| 281 | ! Dimensions: (ncol,nlay+1) |
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| 282 | real(kind=rb), intent(out) :: dflx(:,:) ! Total sky longwave downward flux (W/m2) |
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| 283 | ! Dimensions: (ncol,nlay+1) |
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| 284 | real(kind=rb), intent(out) :: hr(:,:) ! Total sky longwave radiative heating rate (K/d) |
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| 285 | ! Dimensions: (ncol,nlay) |
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| 286 | real(kind=rb), intent(out) :: uflxc(:,:) ! Clear sky longwave upward flux (W/m2) |
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| 287 | ! Dimensions: (ncol,nlay+1) |
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| 288 | real(kind=rb), intent(out) :: dflxc(:,:) ! Clear sky longwave downward flux (W/m2) |
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| 289 | ! Dimensions: (ncol,nlay+1) |
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| 290 | real(kind=rb), intent(out) :: hrc(:,:) ! Clear sky longwave radiative heating rate (K/d) |
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| 291 | ! Dimensions: (ncol,nlay) |
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| 292 | |
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| 293 | ! ----- Optional Output ----- |
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| 294 | real(kind=rb), intent(out), optional :: duflx_dt(:,:) |
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| 295 | ! change in upward longwave flux (w/m2/k) |
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| 296 | ! with respect to surface temperature |
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| 297 | ! Dimensions: (ncol,nlay+1) |
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| 298 | real(kind=rb), intent(out), optional :: duflxc_dt(:,:) |
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| 299 | ! change in clear sky upward longwave flux (w/m2/k) |
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| 300 | ! with respect to surface temperature |
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| 301 | ! Dimensions: (ncol,nlay+1) |
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| 302 | |
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| 303 | ! ----- Local ----- |
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| 304 | |
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| 305 | ! Control |
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| 306 | integer(kind=im) :: nlayers ! total number of layers |
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| 307 | integer(kind=im) :: istart ! beginning band of calculation |
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| 308 | integer(kind=im) :: iend ! ending band of calculation |
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| 309 | integer(kind=im) :: iout ! output option flag (inactive) |
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| 310 | integer(kind=im) :: iaer ! aerosol option flag |
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| 311 | integer(kind=im) :: iplon ! column loop index |
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| 312 | integer(kind=im) :: imca ! flag for mcica [0=off, 1=on] |
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| 313 | integer(kind=im) :: k ! layer loop index |
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| 314 | integer(kind=im) :: ig ! g-point loop index |
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| 315 | |
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| 316 | ! Atmosphere |
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| 317 | real(kind=rb) :: pavel(nlay+1) ! layer pressures (mb) |
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| 318 | real(kind=rb) :: tavel(nlay+1) ! layer temperatures (K) |
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| 319 | real(kind=rb) :: pz(0:nlay+1) ! level (interface) pressures (hPa, mb) |
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| 320 | real(kind=rb) :: tz(0:nlay+1) ! level (interface) temperatures (K) |
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| 321 | real(kind=rb) :: tbound ! surface temperature (K) |
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| 322 | real(kind=rb) :: coldry(nlay+1) ! dry air column density (mol/cm2) |
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| 323 | real(kind=rb) :: wbrodl(nlay+1) ! broadening gas column density (mol/cm2) |
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| 324 | real(kind=rb) :: wkl(mxmol,nlay+1) ! molecular amounts (mol/cm-2) |
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| 325 | real(kind=rb) :: wx(maxxsec,nlay+1) ! cross-section amounts (mol/cm-2) |
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| 326 | real(kind=rb) :: pwvcm ! precipitable water vapor (cm) |
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| 327 | real(kind=rb) :: semiss(nbndlw) ! lw surface emissivity |
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| 328 | real(kind=rb) :: fracs(nlay+1,ngptlw) ! |
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| 329 | real(kind=rb) :: taug(nlay+1,ngptlw) ! gaseous optical depths |
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| 330 | real(kind=rb) :: taut(nlay+1,ngptlw) ! gaseous + aerosol optical depths |
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| 331 | |
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| 332 | real(kind=rb) :: taua(nlay+1,nbndlw) ! aerosol optical depth |
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| 333 | ! real(kind=rb) :: ssaa(nlay+1,nbndlw) ! aerosol single scattering albedo |
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| 334 | ! for future expansion |
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| 335 | ! (lw aerosols/scattering not yet available) |
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| 336 | ! real(kind=rb) :: asma(nlay+1,nbndlw) ! aerosol asymmetry parameter |
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| 337 | ! for future expansion |
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| 338 | ! (lw aerosols/scattering not yet available) |
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| 339 | |
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| 340 | ! Atmosphere - setcoef |
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| 341 | integer(kind=im) :: laytrop ! tropopause layer index |
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| 342 | integer(kind=im) :: jp(nlay+1) ! lookup table index |
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| 343 | integer(kind=im) :: jt(nlay+1) ! lookup table index |
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| 344 | integer(kind=im) :: jt1(nlay+1) ! lookup table index |
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| 345 | real(kind=rb) :: planklay(nlay+1,nbndlw)! |
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| 346 | real(kind=rb) :: planklev(0:nlay+1,nbndlw)! |
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| 347 | real(kind=rb) :: plankbnd(nbndlw) ! |
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| 348 | real(kind=rb) :: dplankbnd_dt(nbndlw) ! |
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| 349 | |
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| 350 | real(kind=rb) :: colh2o(nlay+1) ! column amount (h2o) |
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| 351 | real(kind=rb) :: colco2(nlay+1) ! column amount (co2) |
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| 352 | real(kind=rb) :: colo3(nlay+1) ! column amount (o3) |
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| 353 | real(kind=rb) :: coln2o(nlay+1) ! column amount (n2o) |
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| 354 | real(kind=rb) :: colco(nlay+1) ! column amount (co) |
|---|
| 355 | real(kind=rb) :: colch4(nlay+1) ! column amount (ch4) |
|---|
| 356 | real(kind=rb) :: colo2(nlay+1) ! column amount (o2) |
|---|
| 357 | real(kind=rb) :: colbrd(nlay+1) ! column amount (broadening gases) |
|---|
| 358 | |
|---|
| 359 | integer(kind=im) :: indself(nlay+1) |
|---|
| 360 | integer(kind=im) :: indfor(nlay+1) |
|---|
| 361 | real(kind=rb) :: selffac(nlay+1) |
|---|
| 362 | real(kind=rb) :: selffrac(nlay+1) |
|---|
| 363 | real(kind=rb) :: forfac(nlay+1) |
|---|
| 364 | real(kind=rb) :: forfrac(nlay+1) |
|---|
| 365 | |
|---|
| 366 | integer(kind=im) :: indminor(nlay+1) |
|---|
| 367 | real(kind=rb) :: minorfrac(nlay+1) |
|---|
| 368 | real(kind=rb) :: scaleminor(nlay+1) |
|---|
| 369 | real(kind=rb) :: scaleminorn2(nlay+1) |
|---|
| 370 | |
|---|
| 371 | real(kind=rb) :: & ! |
|---|
| 372 | fac00(nlay+1), fac01(nlay+1), & |
|---|
| 373 | fac10(nlay+1), fac11(nlay+1) |
|---|
| 374 | real(kind=rb) :: & ! |
|---|
| 375 | rat_h2oco2(nlay+1),rat_h2oco2_1(nlay+1), & |
|---|
| 376 | rat_h2oo3(nlay+1),rat_h2oo3_1(nlay+1), & |
|---|
| 377 | rat_h2on2o(nlay+1),rat_h2on2o_1(nlay+1), & |
|---|
| 378 | rat_h2och4(nlay+1),rat_h2och4_1(nlay+1), & |
|---|
| 379 | rat_n2oco2(nlay+1),rat_n2oco2_1(nlay+1), & |
|---|
| 380 | rat_o3co2(nlay+1),rat_o3co2_1(nlay+1) |
|---|
| 381 | |
|---|
| 382 | ! Atmosphere/clouds - cldprop |
|---|
| 383 | integer(kind=im) :: ncbands ! number of cloud spectral bands |
|---|
| 384 | integer(kind=im) :: inflag ! flag for cloud property method |
|---|
| 385 | integer(kind=im) :: iceflag ! flag for ice cloud properties |
|---|
| 386 | integer(kind=im) :: liqflag ! flag for liquid cloud properties |
|---|
| 387 | |
|---|
| 388 | real(kind=rb) :: cldfrac(nlay+1) ! layer cloud fraction |
|---|
| 389 | real(kind=rb) :: tauc(nbndlw,nlay+1) ! in-cloud optical depth |
|---|
| 390 | ! real(kind=rb) :: ssac(nbndlw,nlay+1) ! in-cloud single scattering albedo |
|---|
| 391 | ! for future expansion |
|---|
| 392 | ! (lw scattering not yet available) |
|---|
| 393 | ! real(kind=rb) :: asmc(nbndlw,nlay+1) ! in-cloud asymmetry parameter |
|---|
| 394 | ! for future expansion |
|---|
| 395 | ! (lw scattering not yet available) |
|---|
| 396 | real(kind=rb) :: ciwp(nlay+1) ! cloud ice water path |
|---|
| 397 | real(kind=rb) :: clwp(nlay+1) ! cloud liquid water path |
|---|
| 398 | real(kind=rb) :: rel(nlay+1) ! cloud liquid particle effective radius (microns) |
|---|
| 399 | real(kind=rb) :: rei(nlay+1) ! cloud ice particle effective size (microns) |
|---|
| 400 | real(kind=rb) :: taucloud(nlay+1,nbndlw)! layer in-cloud optical depth |
|---|
| 401 | |
|---|
| 402 | ! Output |
|---|
| 403 | real(kind=rb) :: totuflux(0:nlay+1) ! upward longwave flux (w/m2) |
|---|
| 404 | real(kind=rb) :: totdflux(0:nlay+1) ! downward longwave flux (w/m2) |
|---|
| 405 | real(kind=rb) :: fnet(0:nlay+1) ! net longwave flux (w/m2) |
|---|
| 406 | real(kind=rb) :: htr(0:nlay+1) ! longwave heating rate (k/day) |
|---|
| 407 | real(kind=rb) :: totuclfl(0:nlay+1) ! clear sky upward longwave flux (w/m2) |
|---|
| 408 | real(kind=rb) :: totdclfl(0:nlay+1) ! clear sky downward longwave flux (w/m2) |
|---|
| 409 | real(kind=rb) :: fnetc(0:nlay+1) ! clear sky net longwave flux (w/m2) |
|---|
| 410 | real(kind=rb) :: htrc(0:nlay+1) ! clear sky longwave heating rate (k/day) |
|---|
| 411 | real(kind=rb) :: dtotuflux_dt(0:nlay+1) ! change in upward longwave flux (w/m2/k) |
|---|
| 412 | ! with respect to surface temperature |
|---|
| 413 | real(kind=rb) :: dtotuclfl_dt(0:nlay+1) ! change in clear sky upward longwave flux (w/m2/k) |
|---|
| 414 | ! with respect to surface temperature |
|---|
| 415 | |
|---|
| 416 | ! |
|---|
| 417 | ! Initializations |
|---|
| 418 | |
|---|
| 419 | oneminus = 1._rb - 1.e-6_rb |
|---|
| 420 | pi = 2._rb*asin(1._rb) |
|---|
| 421 | fluxfac = pi * 2.e4_rb ! orig: fluxfac = pi * 2.d4 |
|---|
| 422 | istart = 1 |
|---|
| 423 | iend = 16 |
|---|
| 424 | iout = 0 |
|---|
| 425 | |
|---|
| 426 | ! Set imca to select calculation type: |
|---|
| 427 | ! imca = 0, use standard forward model calculation |
|---|
| 428 | ! imca = 1, use McICA for Monte Carlo treatment of sub-grid cloud variability |
|---|
| 429 | |
|---|
| 430 | ! *** This version does not use McICA (imca = 0) *** |
|---|
| 431 | |
|---|
| 432 | ! Set default icld to select of clear or cloud calculation and cloud overlap method |
|---|
| 433 | ! icld = 0, clear only |
|---|
| 434 | ! icld = 1, with clouds using random cloud overlap |
|---|
| 435 | ! icld = 2, with clouds using maximum/random cloud overlap |
|---|
| 436 | ! icld = 3, with clouds using maximum cloud overlap (McICA only) |
|---|
| 437 | if (icld.lt.0.or.icld.gt.3) icld = 2 |
|---|
| 438 | |
|---|
| 439 | ! Set iaer to select aerosol option |
|---|
| 440 | ! iaer = 0, no aerosols |
|---|
| 441 | ! icld = 10, input total aerosol optical depth (tauaer) directly |
|---|
| 442 | iaer = 10 |
|---|
| 443 | |
|---|
| 444 | ! Call model and data initialization, compute lookup tables, perform |
|---|
| 445 | ! reduction of g-points from 256 to 140 for input absorption coefficient |
|---|
| 446 | ! data and other arrays. |
|---|
| 447 | ! |
|---|
| 448 | ! In a GCM this call should be placed in the model initialization |
|---|
| 449 | ! area, since this has to be called only once. |
|---|
| 450 | ! call rrtmg_lw_ini(cpdair) |
|---|
| 451 | |
|---|
| 452 | ! This is the main longitude/column loop within RRTMG. |
|---|
| 453 | do iplon = 1, ncol |
|---|
| 454 | |
|---|
| 455 | ! Prepare atmospheric profile from GCM for use in RRTMG, and define |
|---|
| 456 | ! other input parameters. |
|---|
| 457 | |
|---|
| 458 | call inatm (iplon, nlay, icld, iaer, & |
|---|
| 459 | play, plev, tlay, tlev, tsfc, h2ovmr, & |
|---|
| 460 | o3vmr, co2vmr, ch4vmr, n2ovmr, o2vmr, cfc11vmr, cfc12vmr, & |
|---|
| 461 | cfc22vmr, ccl4vmr, emis, inflglw, iceflglw, liqflglw, & |
|---|
| 462 | cldfr, taucld, cicewp, cliqwp, reice, reliq, tauaer, & |
|---|
| 463 | nlayers, pavel, pz, tavel, tz, tbound, semiss, coldry, & |
|---|
| 464 | wkl, wbrodl, wx, pwvcm, inflag, iceflag, liqflag, & |
|---|
| 465 | cldfrac, tauc, ciwp, clwp, rei, rel, taua) |
|---|
| 466 | |
|---|
| 467 | ! For cloudy atmosphere, use cldprop to set cloud optical properties based on |
|---|
| 468 | ! input cloud physical properties. Select method based on choices described |
|---|
| 469 | ! in cldprop. Cloud fraction, water path, liquid droplet and ice particle |
|---|
| 470 | ! effective radius must be passed into cldprop. Cloud fraction and cloud |
|---|
| 471 | ! optical depth are transferred to rrtmg_lw arrays in cldprop. |
|---|
| 472 | |
|---|
| 473 | call cldprop(nlayers, inflag, iceflag, liqflag, cldfrac, tauc, & |
|---|
| 474 | ciwp, clwp, rei, rel, ncbands, taucloud) |
|---|
| 475 | |
|---|
| 476 | ! Calculate information needed by the radiative transfer routine |
|---|
| 477 | ! that is specific to this atmosphere, especially some of the |
|---|
| 478 | ! coefficients and indices needed to compute the optical depths |
|---|
| 479 | ! by interpolating data from stored reference atmospheres. |
|---|
| 480 | |
|---|
| 481 | call setcoef(nlayers, istart, pavel, tavel, tz, tbound, semiss, & |
|---|
| 482 | coldry, wkl, wbrodl, & |
|---|
| 483 | laytrop, jp, jt, jt1, planklay, planklev, plankbnd, & |
|---|
| 484 | idrv, dplankbnd_dt, & |
|---|
| 485 | colh2o, colco2, colo3, coln2o, colco, colch4, colo2, & |
|---|
| 486 | colbrd, fac00, fac01, fac10, fac11, & |
|---|
| 487 | rat_h2oco2, rat_h2oco2_1, rat_h2oo3, rat_h2oo3_1, & |
|---|
| 488 | rat_h2on2o, rat_h2on2o_1, rat_h2och4, rat_h2och4_1, & |
|---|
| 489 | rat_n2oco2, rat_n2oco2_1, rat_o3co2, rat_o3co2_1, & |
|---|
| 490 | selffac, selffrac, indself, forfac, forfrac, indfor, & |
|---|
| 491 | minorfrac, scaleminor, scaleminorn2, indminor) |
|---|
| 492 | |
|---|
| 493 | ! Calculate the gaseous optical depths and Planck fractions for |
|---|
| 494 | ! each longwave spectral band. |
|---|
| 495 | |
|---|
| 496 | call taumol(nlayers, pavel, wx, coldry, & |
|---|
| 497 | laytrop, jp, jt, jt1, planklay, planklev, plankbnd, & |
|---|
| 498 | colh2o, colco2, colo3, coln2o, colco, colch4, colo2, & |
|---|
| 499 | colbrd, fac00, fac01, fac10, fac11, & |
|---|
| 500 | rat_h2oco2, rat_h2oco2_1, rat_h2oo3, rat_h2oo3_1, & |
|---|
| 501 | rat_h2on2o, rat_h2on2o_1, rat_h2och4, rat_h2och4_1, & |
|---|
| 502 | rat_n2oco2, rat_n2oco2_1, rat_o3co2, rat_o3co2_1, & |
|---|
| 503 | selffac, selffrac, indself, forfac, forfrac, indfor, & |
|---|
| 504 | minorfrac, scaleminor, scaleminorn2, indminor, & |
|---|
| 505 | fracs, taug) |
|---|
| 506 | |
|---|
| 507 | ! Combine gaseous and aerosol optical depths, if aerosol active |
|---|
| 508 | if (iaer .eq. 0) then |
|---|
| 509 | do k = 1, nlayers |
|---|
| 510 | do ig = 1, ngptlw |
|---|
| 511 | taut(k,ig) = taug(k,ig) |
|---|
| 512 | enddo |
|---|
| 513 | enddo |
|---|
| 514 | elseif (iaer .eq. 10) then |
|---|
| 515 | do k = 1, nlayers |
|---|
| 516 | do ig = 1, ngptlw |
|---|
| 517 | taut(k,ig) = taug(k,ig) + taua(k,ngb(ig)) |
|---|
| 518 | enddo |
|---|
| 519 | enddo |
|---|
| 520 | endif |
|---|
| 521 | |
|---|
| 522 | ! Call the radiative transfer routine. |
|---|
| 523 | ! Either routine can be called to do clear sky calculation. If clouds |
|---|
| 524 | ! are present, then select routine based on cloud overlap assumption |
|---|
| 525 | ! to be used. Clear sky calculation is done simultaneously. |
|---|
| 526 | |
|---|
| 527 | if (icld .eq. 1) then |
|---|
| 528 | call rtrn(nlayers, istart, iend, iout, pz, semiss, ncbands, & |
|---|
| 529 | cldfrac, taucloud, planklay, planklev, plankbnd, & |
|---|
| 530 | pwvcm, fracs, taut, & |
|---|
| 531 | totuflux, totdflux, fnet, htr, & |
|---|
| 532 | totuclfl, totdclfl, fnetc, htrc, & |
|---|
| 533 | idrv, dplankbnd_dt, dtotuflux_dt, dtotuclfl_dt ) |
|---|
| 534 | else |
|---|
| 535 | call rtrnmr(nlayers, istart, iend, iout, pz, semiss, ncbands, & |
|---|
| 536 | cldfrac, taucloud, planklay, planklev, plankbnd, & |
|---|
| 537 | pwvcm, fracs, taut, & |
|---|
| 538 | totuflux, totdflux, fnet, htr, & |
|---|
| 539 | totuclfl, totdclfl, fnetc, htrc, & |
|---|
| 540 | idrv, dplankbnd_dt, dtotuflux_dt, dtotuclfl_dt ) |
|---|
| 541 | endif |
|---|
| 542 | |
|---|
| 543 | ! Transfer up and down fluxes and heating rate to output arrays. |
|---|
| 544 | ! Vertical indexing goes from bottom to top; reverse here for GCM if necessary. |
|---|
| 545 | |
|---|
| 546 | do k = 0, nlayers |
|---|
| 547 | uflx(iplon,k+1) = totuflux(k) |
|---|
| 548 | dflx(iplon,k+1) = totdflux(k) |
|---|
| 549 | uflxc(iplon,k+1) = totuclfl(k) |
|---|
| 550 | dflxc(iplon,k+1) = totdclfl(k) |
|---|
| 551 | enddo |
|---|
| 552 | do k = 0, nlayers-1 |
|---|
| 553 | hr(iplon,k+1) = htr(k) |
|---|
| 554 | hrc(iplon,k+1) = htrc(k) |
|---|
| 555 | enddo |
|---|
| 556 | |
|---|
| 557 | ! If idrv=1 option is active, transfer upward flux derivatives to output arrays. |
|---|
| 558 | |
|---|
| 559 | if (idrv .eq. 1) then |
|---|
| 560 | do k = 0, nlayers |
|---|
| 561 | duflx_dt(iplon,k+1) = dtotuflux_dt(k) |
|---|
| 562 | duflxc_dt(iplon,k+1) = dtotuclfl_dt(k) |
|---|
| 563 | enddo |
|---|
| 564 | endif |
|---|
| 565 | |
|---|
| 566 | ! End longitude/column loop |
|---|
| 567 | enddo |
|---|
| 568 | |
|---|
| 569 | end subroutine rrtmg_lw |
|---|
| 570 | |
|---|
| 571 | !*************************************************************************** |
|---|
| 572 | subroutine inatm (iplon, nlay, icld, iaer, & |
|---|
| 573 | play, plev, tlay, tlev, tsfc, h2ovmr, & |
|---|
| 574 | o3vmr, co2vmr, ch4vmr, n2ovmr, o2vmr, cfc11vmr, cfc12vmr, & |
|---|
| 575 | cfc22vmr, ccl4vmr, emis, inflglw, iceflglw, liqflglw, & |
|---|
| 576 | cldfr, taucld, cicewp, cliqwp, reice, reliq, tauaer, & |
|---|
| 577 | nlayers, pavel, pz, tavel, tz, tbound, semiss, coldry, & |
|---|
| 578 | wkl, wbrodl, wx, pwvcm, inflag, iceflag, liqflag, & |
|---|
| 579 | cldfrac, tauc, ciwp, clwp, rei, rel, taua) |
|---|
| 580 | !*************************************************************************** |
|---|
| 581 | ! |
|---|
| 582 | ! Input atmospheric profile from GCM, and prepare it for use in RRTMG_LW. |
|---|
| 583 | ! Set other RRTMG_LW input parameters. |
|---|
| 584 | ! |
|---|
| 585 | !*************************************************************************** |
|---|
| 586 | |
|---|
| 587 | ! --------- Modules ---------- |
|---|
| 588 | |
|---|
| 589 | use parrrtm, only : nbndlw, ngptlw, nmol, maxxsec, mxmol |
|---|
| 590 | use rrlw_con, only: fluxfac, heatfac, oneminus, pi, grav, avogad |
|---|
| 591 | use rrlw_wvn, only: ng, nspa, nspb, wavenum1, wavenum2, delwave, ixindx |
|---|
| 592 | |
|---|
| 593 | ! ------- Declarations ------- |
|---|
| 594 | |
|---|
| 595 | ! ----- Input ----- |
|---|
| 596 | ! Note: All volume mixing ratios are in dimensionless units of mole fraction obtained |
|---|
| 597 | ! by scaling mass mixing ratio (g/g) with the appropriate molecular weights (g/mol) |
|---|
| 598 | integer(kind=im), intent(in) :: iplon ! column loop index |
|---|
| 599 | integer(kind=im), intent(in) :: nlay ! Number of model layers |
|---|
| 600 | integer(kind=im), intent(in) :: icld ! clear/cloud and cloud overlap flag |
|---|
| 601 | integer(kind=im), intent(in) :: iaer ! aerosol option flag |
|---|
| 602 | |
|---|
| 603 | real(kind=rb), intent(in) :: play(:,:) ! Layer pressures (hPa, mb) |
|---|
| 604 | ! Dimensions: (ncol,nlay) |
|---|
| 605 | real(kind=rb), intent(in) :: plev(:,:) ! Interface pressures (hPa, mb) |
|---|
| 606 | ! Dimensions: (ncol,nlay+1) |
|---|
| 607 | real(kind=rb), intent(in) :: tlay(:,:) ! Layer temperatures (K) |
|---|
| 608 | ! Dimensions: (ncol,nlay) |
|---|
| 609 | real(kind=rb), intent(in) :: tlev(:,:) ! Interface temperatures (K) |
|---|
| 610 | ! Dimensions: (ncol,nlay+1) |
|---|
| 611 | real(kind=rb), intent(in) :: tsfc(:) ! Surface temperature (K) |
|---|
| 612 | ! Dimensions: (ncol) |
|---|
| 613 | real(kind=rb), intent(in) :: h2ovmr(:,:) ! H2O volume mixing ratio |
|---|
| 614 | ! Dimensions: (ncol,nlay) |
|---|
| 615 | real(kind=rb), intent(in) :: o3vmr(:,:) ! O3 volume mixing ratio |
|---|
| 616 | ! Dimensions: (ncol,nlay) |
|---|
| 617 | real(kind=rb), intent(in) :: co2vmr(:,:) ! CO2 volume mixing ratio |
|---|
| 618 | ! Dimensions: (ncol,nlay) |
|---|
| 619 | real(kind=rb), intent(in) :: ch4vmr(:,:) ! Methane volume mixing ratio |
|---|
| 620 | ! Dimensions: (ncol,nlay) |
|---|
| 621 | real(kind=rb), intent(in) :: n2ovmr(:,:) ! Nitrous oxide volume mixing ratio |
|---|
| 622 | ! Dimensions: (ncol,nlay) |
|---|
| 623 | real(kind=rb), intent(in) :: o2vmr(:,:) ! Oxygen volume mixing ratio |
|---|
| 624 | ! Dimensions: (ncol,nlay) |
|---|
| 625 | real(kind=rb), intent(in) :: cfc11vmr(:,:) ! CFC11 volume mixing ratio |
|---|
| 626 | ! Dimensions: (ncol,nlay) |
|---|
| 627 | real(kind=rb), intent(in) :: cfc12vmr(:,:) ! CFC12 volume mixing ratio |
|---|
| 628 | ! Dimensions: (ncol,nlay) |
|---|
| 629 | real(kind=rb), intent(in) :: cfc22vmr(:,:) ! CFC22 volume mixing ratio |
|---|
| 630 | ! Dimensions: (ncol,nlay) |
|---|
| 631 | real(kind=rb), intent(in) :: ccl4vmr(:,:) ! CCL4 volume mixing ratio |
|---|
| 632 | ! Dimensions: (ncol,nlay) |
|---|
| 633 | real(kind=rb), intent(in) :: emis(:,:) ! Surface emissivity |
|---|
| 634 | ! Dimensions: (ncol,nbndlw) |
|---|
| 635 | |
|---|
| 636 | integer(kind=im), intent(in) :: inflglw ! Flag for cloud optical properties |
|---|
| 637 | integer(kind=im), intent(in) :: iceflglw ! Flag for ice particle specification |
|---|
| 638 | integer(kind=im), intent(in) :: liqflglw ! Flag for liquid droplet specification |
|---|
| 639 | |
|---|
| 640 | real(kind=rb), intent(in) :: cldfr(:,:) ! Cloud fraction |
|---|
| 641 | ! Dimensions: (ncol,nlay) |
|---|
| 642 | real(kind=rb), intent(in) :: cicewp(:,:) ! Cloud ice water path (g/m2) |
|---|
| 643 | ! Dimensions: (ncol,nlay) |
|---|
| 644 | real(kind=rb), intent(in) :: cliqwp(:,:) ! Cloud liquid water path (g/m2) |
|---|
| 645 | ! Dimensions: (ncol,nlay) |
|---|
| 646 | real(kind=rb), intent(in) :: reice(:,:) ! Cloud ice effective size (microns) |
|---|
| 647 | ! Dimensions: (ncol,nlay) |
|---|
| 648 | real(kind=rb), intent(in) :: reliq(:,:) ! Cloud water drop effective radius (microns) |
|---|
| 649 | ! Dimensions: (ncol,nlay) |
|---|
| 650 | real(kind=rb), intent(in) :: taucld(:,:,:) ! In-cloud optical depth |
|---|
| 651 | ! Dimensions: (nbndlw,ncol,nlay) |
|---|
| 652 | real(kind=rb), intent(in) :: tauaer(:,:,:) ! Aerosol optical depth |
|---|
| 653 | ! Dimensions: (ncol,nlay,nbndlw) |
|---|
| 654 | |
|---|
| 655 | ! ----- Output ----- |
|---|
| 656 | ! Atmosphere |
|---|
| 657 | integer(kind=im), intent(out) :: nlayers ! number of layers |
|---|
| 658 | |
|---|
| 659 | real(kind=rb), intent(out) :: pavel(:) ! layer pressures (mb) |
|---|
| 660 | ! Dimensions: (nlay) |
|---|
| 661 | real(kind=rb), intent(out) :: tavel(:) ! layer temperatures (K) |
|---|
| 662 | ! Dimensions: (nlay) |
|---|
| 663 | real(kind=rb), intent(out) :: pz(0:) ! level (interface) pressures (hPa, mb) |
|---|
| 664 | ! Dimensions: (0:nlay) |
|---|
| 665 | real(kind=rb), intent(out) :: tz(0:) ! level (interface) temperatures (K) |
|---|
| 666 | ! Dimensions: (0:nlay) |
|---|
| 667 | real(kind=rb), intent(out) :: tbound ! surface temperature (K) |
|---|
| 668 | real(kind=rb), intent(out) :: coldry(:) ! dry air column density (mol/cm2) |
|---|
| 669 | ! Dimensions: (nlay) |
|---|
| 670 | real(kind=rb), intent(out) :: wbrodl(:) ! broadening gas column density (mol/cm2) |
|---|
| 671 | ! Dimensions: (nlay) |
|---|
| 672 | real(kind=rb), intent(out) :: wkl(:,:) ! molecular amounts (mol/cm-2) |
|---|
| 673 | ! Dimensions: (mxmol,nlay) |
|---|
| 674 | real(kind=rb), intent(out) :: wx(:,:) ! cross-section amounts (mol/cm-2) |
|---|
| 675 | ! Dimensions: (maxxsec,nlay) |
|---|
| 676 | real(kind=rb), intent(out) :: pwvcm ! precipitable water vapor (cm) |
|---|
| 677 | real(kind=rb), intent(out) :: semiss(:) ! lw surface emissivity |
|---|
| 678 | ! Dimensions: (nbndlw) |
|---|
| 679 | |
|---|
| 680 | ! Atmosphere/clouds - cldprop |
|---|
| 681 | integer(kind=im), intent(out) :: inflag ! flag for cloud property method |
|---|
| 682 | integer(kind=im), intent(out) :: iceflag ! flag for ice cloud properties |
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| 683 | integer(kind=im), intent(out) :: liqflag ! flag for liquid cloud properties |
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| 684 | |
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| 685 | real(kind=rb), intent(out) :: cldfrac(:) ! layer cloud fraction |
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| 686 | ! Dimensions: (nlay) |
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| 687 | real(kind=rb), intent(out) :: ciwp(:) ! cloud ice water path |
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| 688 | ! Dimensions: (nlay) |
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| 689 | real(kind=rb), intent(out) :: clwp(:) ! cloud liquid water path |
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| 690 | ! Dimensions: (nlay) |
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| 691 | real(kind=rb), intent(out) :: rel(:) ! cloud liquid particle effective radius (microns) |
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| 692 | ! Dimensions: (nlay) |
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| 693 | real(kind=rb), intent(out) :: rei(:) ! cloud ice particle effective size (microns) |
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| 694 | ! Dimensions: (nlay) |
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| 695 | real(kind=rb), intent(out) :: tauc(:,:) ! in-cloud optical depth |
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| 696 | ! Dimensions: (nbndlw,nlay) |
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| 697 | real(kind=rb), intent(out) :: taua(:,:) ! aerosol optical depth |
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| 698 | ! Dimensions: (nlay,nbndlw) |
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| 699 | |
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| 700 | |
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| 701 | ! ----- Local ----- |
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| 702 | real(kind=rb), parameter :: amd = 28.9660_rb ! Effective molecular weight of dry air (g/mol) |
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| 703 | real(kind=rb), parameter :: amw = 18.0160_rb ! Molecular weight of water vapor (g/mol) |
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| 704 | ! real(kind=rb), parameter :: amc = 44.0098_rb ! Molecular weight of carbon dioxide (g/mol) |
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| 705 | ! real(kind=rb), parameter :: amo = 47.9998_rb ! Molecular weight of ozone (g/mol) |
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| 706 | ! real(kind=rb), parameter :: amo2 = 31.9999_rb ! Molecular weight of oxygen (g/mol) |
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| 707 | ! real(kind=rb), parameter :: amch4 = 16.0430_rb ! Molecular weight of methane (g/mol) |
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| 708 | ! real(kind=rb), parameter :: amn2o = 44.0128_rb ! Molecular weight of nitrous oxide (g/mol) |
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| 709 | ! real(kind=rb), parameter :: amc11 = 137.3684_rb ! Molecular weight of CFC11 (g/mol) - CCL3F |
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| 710 | ! real(kind=rb), parameter :: amc12 = 120.9138_rb ! Molecular weight of CFC12 (g/mol) - CCL2F2 |
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| 711 | ! real(kind=rb), parameter :: amc22 = 86.4688_rb ! Molecular weight of CFC22 (g/mol) - CHCLF2 |
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| 712 | ! real(kind=rb), parameter :: amcl4 = 153.823_rb ! Molecular weight of CCL4 (g/mol) - CCL4 |
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| 713 | |
|---|
| 714 | ! Set molecular weight ratios (for converting mmr to vmr) |
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| 715 | ! e.g. h2ovmr = h2ommr * amdw) |
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| 716 | real(kind=rb), parameter :: amdw = 1.607793_rb ! Molecular weight of dry air / water vapor |
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| 717 | real(kind=rb), parameter :: amdc = 0.658114_rb ! Molecular weight of dry air / carbon dioxide |
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| 718 | real(kind=rb), parameter :: amdo = 0.603428_rb ! Molecular weight of dry air / ozone |
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| 719 | real(kind=rb), parameter :: amdm = 1.805423_rb ! Molecular weight of dry air / methane |
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| 720 | real(kind=rb), parameter :: amdn = 0.658090_rb ! Molecular weight of dry air / nitrous oxide |
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| 721 | real(kind=rb), parameter :: amdo2 = 0.905140_rb ! Molecular weight of dry air / oxygen |
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| 722 | real(kind=rb), parameter :: amdc1 = 0.210852_rb ! Molecular weight of dry air / CFC11 |
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| 723 | real(kind=rb), parameter :: amdc2 = 0.239546_rb ! Molecular weight of dry air / CFC12 |
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| 724 | |
|---|
| 725 | integer(kind=im) :: isp, l, ix, n, imol, ib ! Loop indices |
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| 726 | real(kind=rb) :: amm, amttl, wvttl, wvsh, summol |
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| 727 | |
|---|
| 728 | ! Add one to nlayers here to include extra model layer at top of atmosphere |
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| 729 | nlayers = nlay |
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| 730 | |
|---|
| 731 | ! Initialize all molecular amounts and cloud properties to zero here, then pass input amounts |
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| 732 | ! into RRTM arrays below. |
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| 733 | |
|---|
| 734 | wkl(:,:) = 0.0_rb |
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| 735 | wx(:,:) = 0.0_rb |
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| 736 | cldfrac(:) = 0.0_rb |
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| 737 | tauc(:,:) = 0.0_rb |
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| 738 | ciwp(:) = 0.0_rb |
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| 739 | clwp(:) = 0.0_rb |
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| 740 | rei(:) = 0.0_rb |
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| 741 | rel(:) = 0.0_rb |
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| 742 | taua(:,:) = 0.0_rb |
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| 743 | amttl = 0.0_rb |
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| 744 | wvttl = 0.0_rb |
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| 745 | |
|---|
| 746 | ! Set surface temperature. |
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| 747 | tbound = tsfc(iplon) |
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| 748 | |
|---|
| 749 | ! Install input GCM arrays into RRTMG_LW arrays for pressure, temperature, |
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| 750 | ! and molecular amounts. |
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| 751 | ! Pressures are input in mb, or are converted to mb here. |
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| 752 | ! Molecular amounts are input in volume mixing ratio, or are converted from |
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| 753 | ! mass mixing ratio (or specific humidity for h2o) to volume mixing ratio |
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| 754 | ! here. These are then converted to molecular amount (molec/cm2) below. |
|---|
| 755 | ! The dry air column COLDRY (in molec/cm2) is calculated from the level |
|---|
| 756 | ! pressures, pz (in mb), based on the hydrostatic equation and includes a |
|---|
| 757 | ! correction to account for h2o in the layer. The molecular weight of moist |
|---|
| 758 | ! air (amm) is calculated for each layer. |
|---|
| 759 | ! Note: In RRTMG, layer indexing goes from bottom to top, and coding below |
|---|
| 760 | ! assumes GCM input fields are also bottom to top. Input layer indexing |
|---|
| 761 | ! from GCM fields should be reversed here if necessary. |
|---|
| 762 | |
|---|
| 763 | pz(0) = plev(iplon,1) |
|---|
| 764 | tz(0) = tlev(iplon,1) |
|---|
| 765 | do l = 1, nlayers |
|---|
| 766 | pavel(l) = play(iplon,l) |
|---|
| 767 | tavel(l) = tlay(iplon,l) |
|---|
| 768 | pz(l) = plev(iplon,l+1) |
|---|
| 769 | tz(l) = tlev(iplon,l+1) |
|---|
| 770 | ! For h2o input in vmr: |
|---|
| 771 | wkl(1,l) = h2ovmr(iplon,l) |
|---|
| 772 | ! For h2o input in mmr: |
|---|
| 773 | ! wkl(1,l) = h2o(iplon,l)*amdw |
|---|
| 774 | ! For h2o input in specific humidity; |
|---|
| 775 | ! wkl(1,l) = (h2o(iplon,l)/(1._rb - h2o(iplon,l)))*amdw |
|---|
| 776 | wkl(2,l) = co2vmr(iplon,l) |
|---|
| 777 | wkl(3,l) = o3vmr(iplon,l) |
|---|
| 778 | wkl(4,l) = n2ovmr(iplon,l) |
|---|
| 779 | wkl(6,l) = ch4vmr(iplon,l) |
|---|
| 780 | wkl(7,l) = o2vmr(iplon,l) |
|---|
| 781 | amm = (1._rb - wkl(1,l)) * amd + wkl(1,l) * amw |
|---|
| 782 | coldry(l) = (pz(l-1)-pz(l)) * 1.e3_rb * avogad / & |
|---|
| 783 | (1.e2_rb * grav * amm * (1._rb + wkl(1,l))) |
|---|
| 784 | enddo |
|---|
| 785 | |
|---|
| 786 | ! Set cross section molecule amounts from input; convert to vmr if necessary |
|---|
| 787 | do l=1, nlayers |
|---|
| 788 | wx(1,l) = ccl4vmr(iplon,l) |
|---|
| 789 | wx(2,l) = cfc11vmr(iplon,l) |
|---|
| 790 | wx(3,l) = cfc12vmr(iplon,l) |
|---|
| 791 | wx(4,l) = cfc22vmr(iplon,l) |
|---|
| 792 | enddo |
|---|
| 793 | |
|---|
| 794 | ! The following section can be used to set values for an additional layer (from |
|---|
| 795 | ! the GCM top level to 1.e-4 mb) for improved calculation of TOA fluxes. |
|---|
| 796 | ! Temperature and molecular amounts in the extra model layer are set to |
|---|
| 797 | ! their values in the top GCM model layer, though these can be modified |
|---|
| 798 | ! here if necessary. |
|---|
| 799 | ! If this feature is utilized, increase nlayers by one above, limit the two |
|---|
| 800 | ! loops above to (nlayers-1), and set the top most (extra) layer values here. |
|---|
| 801 | |
|---|
| 802 | ! pavel(nlayers) = 0.5_rb * pz(nlayers-1) |
|---|
| 803 | ! tavel(nlayers) = tavel(nlayers-1) |
|---|
| 804 | ! pz(nlayers) = 1.e-4_rb |
|---|
| 805 | ! tz(nlayers-1) = 0.5_rb * (tavel(nlayers)+tavel(nlayers-1)) |
|---|
| 806 | ! tz(nlayers) = tz(nlayers-1) |
|---|
| 807 | ! wkl(1,nlayers) = wkl(1,nlayers-1) |
|---|
| 808 | ! wkl(2,nlayers) = wkl(2,nlayers-1) |
|---|
| 809 | ! wkl(3,nlayers) = wkl(3,nlayers-1) |
|---|
| 810 | ! wkl(4,nlayers) = wkl(4,nlayers-1) |
|---|
| 811 | ! wkl(6,nlayers) = wkl(6,nlayers-1) |
|---|
| 812 | ! wkl(7,nlayers) = wkl(7,nlayers-1) |
|---|
| 813 | ! amm = (1._rb - wkl(1,nlayers-1)) * amd + wkl(1,nlayers-1) * amw |
|---|
| 814 | ! coldry(nlayers) = (pz(nlayers-1)) * 1.e3_rb * avogad / & |
|---|
| 815 | ! (1.e2_rb * grav * amm * (1._rb + wkl(1,nlayers-1))) |
|---|
| 816 | ! wx(1,nlayers) = wx(1,nlayers-1) |
|---|
| 817 | ! wx(2,nlayers) = wx(2,nlayers-1) |
|---|
| 818 | ! wx(3,nlayers) = wx(3,nlayers-1) |
|---|
| 819 | ! wx(4,nlayers) = wx(4,nlayers-1) |
|---|
| 820 | |
|---|
| 821 | ! At this point all moleculular amounts in wkl and wx are in volume mixing ratio; |
|---|
| 822 | ! convert to molec/cm2 based on coldry for use in rrtm. also, compute precipitable |
|---|
| 823 | ! water vapor for diffusivity angle adjustments in rtrn and rtrnmr. |
|---|
| 824 | |
|---|
| 825 | do l = 1, nlayers |
|---|
| 826 | summol = 0.0_rb |
|---|
| 827 | do imol = 2, nmol |
|---|
| 828 | summol = summol + wkl(imol,l) |
|---|
| 829 | enddo |
|---|
| 830 | wbrodl(l) = coldry(l) * (1._rb - summol) |
|---|
| 831 | do imol = 1, nmol |
|---|
| 832 | wkl(imol,l) = coldry(l) * wkl(imol,l) |
|---|
| 833 | enddo |
|---|
| 834 | amttl = amttl + coldry(l)+wkl(1,l) |
|---|
| 835 | wvttl = wvttl + wkl(1,l) |
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| 836 | do ix = 1,maxxsec |
|---|
| 837 | if (ixindx(ix) .ne. 0) then |
|---|
| 838 | wx(ixindx(ix),l) = coldry(l) * wx(ix,l) * 1.e-20_rb |
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| 839 | endif |
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| 840 | enddo |
|---|
| 841 | enddo |
|---|
| 842 | |
|---|
| 843 | wvsh = (amw * wvttl) / (amd * amttl) |
|---|
| 844 | pwvcm = wvsh * (1.e3_rb * pz(0)) / (1.e2_rb * grav) |
|---|
| 845 | |
|---|
| 846 | ! Set spectral surface emissivity for each longwave band. |
|---|
| 847 | |
|---|
| 848 | do n=1,nbndlw |
|---|
| 849 | semiss(n) = emis(iplon,n) |
|---|
| 850 | ! semiss(n) = 1.0_rb |
|---|
| 851 | enddo |
|---|
| 852 | |
|---|
| 853 | ! Transfer aerosol optical properties to RRTM variable; |
|---|
| 854 | ! modify to reverse layer indexing here if necessary. |
|---|
| 855 | |
|---|
| 856 | if (iaer .ge. 1) then |
|---|
| 857 | do l = 1, nlayers |
|---|
| 858 | do ib = 1, nbndlw |
|---|
| 859 | taua(l,ib) = tauaer(iplon,l,ib) |
|---|
| 860 | enddo |
|---|
| 861 | enddo |
|---|
| 862 | endif |
|---|
| 863 | |
|---|
| 864 | ! Transfer cloud fraction and cloud optical properties to RRTM variables, |
|---|
| 865 | ! modify to reverse layer indexing here if necessary. |
|---|
| 866 | |
|---|
| 867 | if (icld .ge. 1) then |
|---|
| 868 | inflag = inflglw |
|---|
| 869 | iceflag = iceflglw |
|---|
| 870 | liqflag = liqflglw |
|---|
| 871 | |
|---|
| 872 | ! Move incoming GCM cloud arrays to RRTMG cloud arrays. |
|---|
| 873 | ! For GCM input, incoming reice is defined based on selected ice parameterization (inflglw) |
|---|
| 874 | |
|---|
| 875 | do l = 1, nlayers |
|---|
| 876 | cldfrac(l) = cldfr(iplon,l) |
|---|
| 877 | ciwp(l) = cicewp(iplon,l) |
|---|
| 878 | clwp(l) = cliqwp(iplon,l) |
|---|
| 879 | rei(l) = reice(iplon,l) |
|---|
| 880 | rel(l) = reliq(iplon,l) |
|---|
| 881 | do n=1,nbndlw |
|---|
| 882 | tauc(n,l) = taucld(n,iplon,l) |
|---|
| 883 | ! ssac(n,l) = ssacld(n,iplon,l) |
|---|
| 884 | ! asmc(n,l) = asmcld(n,iplon,l) |
|---|
| 885 | enddo |
|---|
| 886 | enddo |
|---|
| 887 | |
|---|
| 888 | ! If an extra layer is being used in RRTMG, set all cloud properties to zero in the extra layer. |
|---|
| 889 | |
|---|
| 890 | ! cldfrac(nlayers) = 0.0_rb |
|---|
| 891 | ! tauc(:nbndlw,nlayers) = 0.0_rb |
|---|
| 892 | ! ciwp(nlayers) = 0.0_rb |
|---|
| 893 | ! clwp(nlayers) = 0.0_rb |
|---|
| 894 | ! rei(nlayers) = 0.0_rb |
|---|
| 895 | ! rel(nlayers) = 0.0_rb |
|---|
| 896 | ! taua(nlayers,:) = 0.0_rb |
|---|
| 897 | |
|---|
| 898 | endif |
|---|
| 899 | |
|---|
| 900 | end subroutine inatm |
|---|
| 901 | |
|---|
| 902 | end module rrtmg_lw_rad |
|---|
| 903 | |
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