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jmc |
1.1 |
module radiation_mod |
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! ================================================================================== |
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! ================================================================================== |
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! use fms_mod, only: open_file, check_nml_error, & |
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! mpp_pe, close_file |
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use gcm_params_mod, only: gcm_LEN_MBUF, gcm_SQZ_R, gcm_stdMsgUnit |
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use constants_mod, only: stefan, cp_air, grav, pstd_mks |
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! use diag_manager_mod, only: register_diag_field, send_data |
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! use time_manager_mod, only: time_type, & |
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! operator(+), operator(-), operator(/=) |
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!================================================================================== |
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implicit none |
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private |
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!================================================================================== |
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! version information |
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jmc |
1.4 |
character(len=128) :: version='$Id: radiation_mod.F90,v 1.3 2012/10/16 15:21:39 jmc Exp $' |
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jmc |
1.1 |
character(len=128) :: tag='homemade' |
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!================================================================================== |
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! public interfaces |
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public :: radiation_init, radiation_down, radiation_up, radiation_end |
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!================================================================================== |
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! module variables |
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logical :: initialized =.false. |
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real :: solar_constant = 1360.0 |
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real :: del_sol = 1.4 |
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! modif omp: winter/summer hemisphere |
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real :: del_sw = 0.0 |
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real :: ir_tau_eq = 6.0 |
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real :: ir_tau_pole = 1.5 |
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jmc |
1.3 |
real :: linear_tau = 0.1 |
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real :: ir_tau_co2 = 0.8678 |
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real :: ir_tau_wv = 1.9979e+3 |
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jmc |
1.1 |
real :: atm_abs = 0.0 |
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real :: sw_diff = 0.0 |
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real :: albedo_value = 0.06 |
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real :: window = 0.0 ! spectral window transparent to LW |
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real :: wv_exponent = 4.0 |
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real :: solar_exponent = 4.0 |
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real, save :: pi, deg_to_rad , rad_to_deg |
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namelist/radiation_nml/ solar_constant, del_sol, & |
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jmc |
1.3 |
ir_tau_eq, ir_tau_pole, linear_tau, ir_tau_co2, ir_tau_wv, & |
| 57 |
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atm_abs, sw_diff, del_sw, albedo_value, window, wv_exponent, & |
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jmc |
1.1 |
solar_exponent |
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!================================================================================== |
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!-------------------- diagnostics fields ------------------------------- |
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!integer :: id_olr, id_swdn_sfc, id_swdn_toa, id_lwdn_sfc, id_lwup_sfc, & |
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! id_tdt_rad, id_flux_rad, id_flux_lw, id_flux_sw, id_entrop_rad, id_tdt_sw |
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character(len=10), parameter :: mod_name = 'two_stream' |
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real :: missing_value = -999. |
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contains |
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! ================================================================================== |
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! ================================================================================== |
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!subroutine radiation_init(is, ie, js, je, num_levels, axes, Time) |
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subroutine radiation_init(is, ie, js, je, num_levels, nSx,nSy, axes, Time, myThid) |
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!------------------------------------------------------------------------------------- |
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integer, intent(in), dimension(4) :: axes |
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!type(time_type), intent(in) :: Time |
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real, intent(in) :: Time |
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integer, intent(in) :: is, ie, js, je, num_levels |
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integer, intent(in) :: nSx, nSy |
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integer, intent(in) :: myThid |
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!------------------------------------------------------------------------------------- |
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integer, dimension(3) :: half = (/1,2,4/) |
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!integer :: ierr, io |
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integer :: iUnit |
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CHARACTER*(gcm_LEN_MBUF) :: msgBuf |
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!----------------------------------------------------------------------------------------- |
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! read namelist and copy to logfile |
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! _BARRIER |
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! _BEGIN_MASTER(myThid) |
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CALL BARRIER(myThid) |
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IF ( myThid.EQ.1 ) THEN |
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WRITE(msgBuf,'(A)') 'RADIATION_INIT: opening data.atm_gray' |
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CALL PRINT_MESSAGE( msgBuf, gcm_stdMsgUnit, gcm_SQZ_R, myThid ) |
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CALL OPEN_COPY_DATA_FILE( & |
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'data.atm_gray', 'RADIATION_INIT', & |
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iUnit, & |
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myThid ) |
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! Read parameters from open data file |
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READ(UNIT=iUnit,NML=radiation_nml) |
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WRITE(msgBuf,'(A)') & |
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'RADIATION_INIT: finished reading data.atm_gray' |
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CALL PRINT_MESSAGE( msgBuf, gcm_stdMsgUnit, gcm_SQZ_R, myThid ) |
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! Close the open data file |
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CLOSE(iUnit) |
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pi = 4.0*atan(1.) |
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deg_to_rad = 2.*pi/360. |
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rad_to_deg = 360.0/2./pi |
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initialized = .true. |
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ENDIF |
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CALL BARRIER(myThid) |
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!----------------------------------------------------------------------- |
| 122 |
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!------------ initialize diagnostic fields --------------- |
| 123 |
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! id_olr = & |
| 125 |
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! register_diag_field ( mod_name, 'olr', axes(1:2), Time, & |
| 126 |
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! 'outgoing longwave radiation', & |
| 127 |
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! 'watts/m2', missing_value=missing_value ) |
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! id_swdn_sfc = & |
| 129 |
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! register_diag_field ( mod_name, 'swdn_sfc', axes(1:2), Time, & |
| 130 |
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! 'SW flux down at surface', & |
| 131 |
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! 'watts/m2', missing_value=missing_value ) |
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! id_swdn_toa = & |
| 133 |
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! register_diag_field ( mod_name, 'swdn_toa', axes(1:2), Time, & |
| 134 |
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! 'SW flux down at TOA', & |
| 135 |
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! 'watts/m2', missing_value=missing_value ) |
| 136 |
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! id_lwup_sfc = & |
| 137 |
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! register_diag_field ( mod_name, 'lwup_sfc', axes(1:2), Time, & |
| 138 |
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! 'LW flux up at surface', & |
| 139 |
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! 'watts/m2', missing_value=missing_value ) |
| 140 |
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! id_lwdn_sfc = & |
| 141 |
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! register_diag_field ( mod_name, 'lwdn_sfc', axes(1:2), Time, & |
| 142 |
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! 'LW flux down at surface', & |
| 143 |
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! 'watts/m2', missing_value=missing_value ) |
| 144 |
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! id_tdt_rad = & |
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! register_diag_field ( mod_name, 'tdt_rad', axes(1:3), Time, & |
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! 'Temperature tendency due to radiation', & |
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! 'K/s', missing_value=missing_value ) |
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! id_tdt_sw = & |
| 149 |
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! register_diag_field ( mod_name, 'tdt_sw', axes(1:3), Time, & |
| 150 |
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! 'Temperature tendency due to SW radiation', & |
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! 'K/s', missing_value=missing_value ) |
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! id_flux_rad = & |
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! register_diag_field ( mod_name, 'flux_rad', axes(half), Time, & |
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! 'Total radiative flux (positive up)', & |
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! 'W/m^2', missing_value=missing_value ) |
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! id_flux_lw = & |
| 157 |
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! register_diag_field ( mod_name, 'flux_lw', axes(half), Time, & |
| 158 |
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! 'Net longwave radiative flux (positive up)', & |
| 159 |
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! 'W/m^2', missing_value=missing_value ) |
| 160 |
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! id_flux_sw = & |
| 161 |
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! register_diag_field ( mod_name, 'flux_sw', axes(half), Time, & |
| 162 |
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! 'Net shortwave radiative flux (positive up)', & |
| 163 |
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! 'W/m^2', missing_value=missing_value ) |
| 164 |
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! id_entrop_rad = & |
| 165 |
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! register_diag_field ( mod_name, 'entrop_rad', axes(1:3), Time, & |
| 166 |
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! 'Entropy production by radiation', & |
| 167 |
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! '1/s', missing_value=missing_value ) |
| 168 |
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return |
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end subroutine radiation_init |
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! ================================================================================== |
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jmc |
1.3 |
subroutine radiation_down (is, js, Time_diag, lat, p_half, t, q, & |
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jmc |
1.1 |
! net_surf_sw_down, surf_lw_down) |
| 176 |
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net_surf_sw_down, surf_lw_down, & |
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albedo, dtrans, b, down, solar_down, & |
| 178 |
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myThid ) |
| 179 |
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! Begin the radiation calculation by computing downward fluxes. |
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! This part of the calculation does not depend on the surface temperature. |
| 182 |
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| 183 |
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integer, intent(in) :: is, js |
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!type(time_type), intent(in) :: Time_diag |
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real, intent(in) :: Time_diag |
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real, intent(in) , dimension(:,:) :: lat |
| 187 |
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real, intent(out) , dimension(:,:) :: net_surf_sw_down |
| 188 |
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real, intent(out) , dimension(:,:) :: surf_lw_down |
| 189 |
jmc |
1.3 |
real, intent(in) , dimension(:,:,:) :: t, q, p_half |
| 190 |
jmc |
1.1 |
real, intent(out), dimension(:,:) :: albedo |
| 191 |
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real, intent(out), dimension(:,:,:) :: dtrans |
| 192 |
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real, intent(out), dimension(:,:,:) :: b |
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real, intent(out), dimension(:,:,:) :: down |
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real, intent(out), dimension(:,:,:) :: solar_down |
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integer, intent(in) :: myThid |
| 196 |
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| 197 |
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integer :: i, j, k, n |
| 198 |
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integer :: im, jm |
| 199 |
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| 200 |
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logical :: used |
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| 202 |
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! ------------------------------------------------------------------------- |
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jmc |
1.3 |
!real, allocatable, dimension(:,:) :: swin |
| 204 |
jmc |
1.1 |
real, allocatable, dimension(:,:) :: ss, solar, tau_0, solar_tau_0, p2 |
| 205 |
jmc |
1.3 |
real, allocatable, dimension(:,:,:) :: solar_tau |
| 206 |
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real, allocatable, dimension(:,:) :: del_tau, tau_km, tau_kp |
| 207 |
jmc |
1.1 |
! ------------------------------------------------------------------------- |
| 208 |
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| 209 |
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n = size(t,3) |
| 210 |
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im = size(t,1) |
| 211 |
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jm = size(t,2) |
| 212 |
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| 213 |
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! ------------------------------------------------------------------------- |
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jmc |
1.3 |
!allocate (swin (im, jm)) |
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jmc |
1.1 |
allocate (ss (im, jm)) |
| 216 |
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allocate (solar (im, jm)) |
| 217 |
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allocate (tau_0 (im, jm)) |
| 218 |
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allocate (solar_tau_0 (im, jm)) |
| 219 |
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allocate (p2 (im, jm)) |
| 220 |
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allocate (solar_tau (im, jm, n+1)) |
| 221 |
jmc |
1.3 |
if ( wv_exponent .eq. 0. ) then |
| 222 |
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allocate (del_tau (im, jm)) |
| 223 |
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else |
| 224 |
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allocate (tau_km (im, jm)) |
| 225 |
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allocate (tau_kp (im, jm)) |
| 226 |
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endif |
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jmc |
1.1 |
! ------------------------------------------------------------------------- |
| 228 |
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| 229 |
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ss = sin(lat) |
| 230 |
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p2 = (1. - 3.*ss*ss)/4. |
| 231 |
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| 232 |
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solar = 0.25*solar_constant*(1.0 + del_sol*p2 + del_sw * ss) |
| 233 |
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| 234 |
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tau_0 = ir_tau_eq + (ir_tau_pole - ir_tau_eq)*ss*ss |
| 235 |
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| 236 |
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solar_tau_0 = (1.0 - sw_diff*ss*ss)*atm_abs |
| 237 |
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| 238 |
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! set a constant albedo for testing |
| 239 |
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albedo(:,:) = albedo_value |
| 240 |
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| 241 |
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do k = 1, n+1 |
| 242 |
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solar_tau(:,:,k) = solar_tau_0(:,:) & |
| 243 |
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*(p_half(:,:,k)/p_half(:,:,n+1))**solar_exponent |
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jmc |
1.3 |
end do |
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jmc |
1.1 |
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| 246 |
jmc |
1.3 |
if ( wv_exponent .eq. 0. ) then |
| 247 |
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! longwave optical thickness function of specific humidity (M.Byrne & P.O'Gorman): |
| 248 |
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do k = 1, n |
| 249 |
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del_tau = ( ir_tau_co2 + ir_tau_wv * q(:,:,k) ) & |
| 250 |
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* ( p_half(:,:,k+1)-p_half(:,:,k) ) / p_half(:,:,n+1) |
| 251 |
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dtrans(:,:,k) = exp( - del_tau ) |
| 252 |
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end do |
| 253 |
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| 254 |
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else |
| 255 |
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! longwave optical thickness function of latitude and pressure |
| 256 |
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k = 1 |
| 257 |
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tau_kp = tau_0(:,:) * ( & |
| 258 |
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linear_tau * p_half(:,:,k)/p_half(:,:,n+1) & |
| 259 |
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+ (1.0 - linear_tau)*(p_half(:,:,k)/p_half(:,:,n+1))**wv_exponent & |
| 260 |
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) |
| 261 |
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do k = 1, n |
| 262 |
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tau_km = tau_kp |
| 263 |
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tau_kp = tau_0(:,:) * ( & |
| 264 |
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linear_tau * p_half(:,:,k+1)/p_half(:,:,n+1) & |
| 265 |
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+ (1.0 - linear_tau)*(p_half(:,:,k+1)/p_half(:,:,n+1))**wv_exponent & |
| 266 |
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) |
| 267 |
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dtrans(:,:,k) = exp( -(tau_kp - tau_km) ) |
| 268 |
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end do |
| 269 |
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| 270 |
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endif |
| 271 |
jmc |
1.1 |
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| 272 |
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! no radiation from spectral window |
| 273 |
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b = (1.0-window)*stefan*t*t*t*t |
| 274 |
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| 275 |
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down(:,:,1) = 0.0 |
| 276 |
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do k = 1,n |
| 277 |
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down(:,:,k+1) = down(:,:,k)*dtrans(:,:,k) + b(:,:,k)*(1.0 - dtrans(:,:,k)) |
| 278 |
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end do |
| 279 |
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| 280 |
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do k = 1,n+1 |
| 281 |
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solar_down(:,:,k) = solar(:,:)*exp(-solar_tau(:,:,k)) |
| 282 |
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end do |
| 283 |
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| 284 |
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surf_lw_down = down(:,:,n+1) |
| 285 |
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net_surf_sw_down = solar_down(:,:,n+1)*(1. - albedo(:,:)) |
| 286 |
jmc |
1.3 |
!swin = solar_down(:,:,1) |
| 287 |
jmc |
1.1 |
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| 288 |
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!------- downward sw flux surface ------- |
| 289 |
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! if ( id_swdn_sfc > 0 ) then |
| 290 |
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! used = send_data ( id_swdn_sfc, net_surf_sw_down, Time_diag) |
| 291 |
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! endif |
| 292 |
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!------- incoming sw flux toa ------- |
| 293 |
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! if ( id_swdn_toa > 0 ) then |
| 294 |
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! used = send_data ( id_swdn_toa, swin, Time_diag) |
| 295 |
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! endif |
| 296 |
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!------- downward lw flux surface ------- |
| 297 |
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! if ( id_lwdn_sfc > 0 ) then |
| 298 |
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! used = send_data ( id_lwdn_sfc, surf_lw_down, Time_diag) |
| 299 |
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! endif |
| 300 |
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| 301 |
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! ------------------------------------------------------------------------- |
| 302 |
jmc |
1.3 |
!deallocate (swin) |
| 303 |
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deallocate (solar_tau) |
| 304 |
jmc |
1.1 |
deallocate (ss, solar, tau_0, solar_tau_0, p2) |
| 305 |
jmc |
1.3 |
if ( wv_exponent .eq. 0. ) then |
| 306 |
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deallocate (del_tau) |
| 307 |
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else |
| 308 |
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deallocate (tau_km, tau_kp) |
| 309 |
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endif |
| 310 |
jmc |
1.1 |
! ------------------------------------------------------------------------- |
| 311 |
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| 312 |
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return |
| 313 |
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end subroutine radiation_down |
| 314 |
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| 315 |
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! ================================================================================== |
| 316 |
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| 317 |
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!subroutine radiation_up (is, js, Time_diag, lat, p_half, t_surf, t, tdt) |
| 318 |
jmc |
1.2 |
subroutine radiation_up ( is, js, Time_diag, lat, p_half, t_surf, t, tdt, olr, & |
| 319 |
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albedo, dtrans, b, down, solar_down, & |
| 320 |
jmc |
1.1 |
myThid ) |
| 321 |
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| 322 |
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! Now complete the radiation calculation by computing the upward and net fluxes. |
| 323 |
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| 324 |
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integer, intent(in) :: is, js |
| 325 |
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!type(time_type), intent(in) :: Time_diag |
| 326 |
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real, intent(in) :: Time_diag |
| 327 |
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real, intent(in) , dimension(:,:) :: lat |
| 328 |
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real, intent(in) , dimension(:,:) :: t_surf |
| 329 |
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real, intent(in) , dimension(:,:,:) :: t, p_half |
| 330 |
|
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real, intent(inout), dimension(:,:,:) :: tdt |
| 331 |
jmc |
1.2 |
real, intent(out), dimension(:,:) :: olr |
| 332 |
jmc |
1.1 |
real, intent(in), dimension(:,:) :: albedo |
| 333 |
|
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real, intent(in), dimension(:,:,:) :: dtrans |
| 334 |
|
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real, intent(in), dimension(:,:,:) :: b |
| 335 |
|
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real, intent(in), dimension(:,:,:) :: down |
| 336 |
|
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real, intent(in), dimension(:,:,:) :: solar_down |
| 337 |
|
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integer, intent(in) :: myThid |
| 338 |
|
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|
| 339 |
|
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integer :: i, j, k, n |
| 340 |
|
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integer :: im, jm |
| 341 |
|
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| 342 |
|
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logical :: used |
| 343 |
|
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| 344 |
|
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! ------------------------------------------------------------------------- |
| 345 |
|
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real, allocatable, dimension(:,:) :: b_surf |
| 346 |
|
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real, allocatable, dimension(:,:,:) :: tdt_rad, entrop_rad, tdt_sw |
| 347 |
|
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real, allocatable, dimension(:,:,:) :: up, net, flux_rad, flux_sw |
| 348 |
|
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! ------------------------------------------------------------------------- |
| 349 |
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| 350 |
|
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n = size(t,3) |
| 351 |
|
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im = size(t,1) |
| 352 |
|
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jm = size(t,2) |
| 353 |
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| 354 |
|
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! ------------------------------------------------------------------------- |
| 355 |
|
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allocate (tdt_rad (im, jm, n)) |
| 356 |
|
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allocate (tdt_sw (im, jm, n)) |
| 357 |
|
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allocate (entrop_rad (im, jm, n)) |
| 358 |
|
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allocate (up (im, jm, n+1)) |
| 359 |
|
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allocate (net (im, jm, n+1)) |
| 360 |
|
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allocate (flux_rad (im, jm, n+1)) |
| 361 |
|
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allocate (flux_sw (im, jm, n+1)) |
| 362 |
|
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allocate (b_surf (im, jm)) |
| 363 |
|
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! ------------------------------------------------------------------------- |
| 364 |
|
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|
| 365 |
|
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! total flux from surface |
| 366 |
|
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b_surf = stefan*t_surf*t_surf*t_surf*t_surf |
| 367 |
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| 368 |
|
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! first deal with non-window upward flux |
| 369 |
|
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up(:,:,n+1) = b_surf*(1.0-window) |
| 370 |
|
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do k = n,1,-1 |
| 371 |
|
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up(:,:,k) = up(:,:,k+1)*dtrans(:,:,k) + b(:,:,k)*(1.0 - dtrans(:,:,k)) |
| 372 |
|
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end do |
| 373 |
|
|
|
| 374 |
|
|
! add upward flux in spectral window |
| 375 |
|
|
do k = 1,n+1 |
| 376 |
|
|
up(:,:,k) = up(:,:,k) + b_surf(:,:)*window |
| 377 |
|
|
end do |
| 378 |
|
|
|
| 379 |
|
|
do k = 1,n+1 |
| 380 |
|
|
net(:,:,k) = up(:,:,k)-down(:,:,k) |
| 381 |
|
|
flux_sw(:,:,k) = albedo(:,:)*solar_down(:,:,n+1) - solar_down(:,:,k) |
| 382 |
|
|
flux_rad(:,:,k) = net(:,:,k) + flux_sw(:,:,k) |
| 383 |
|
|
end do |
| 384 |
|
|
|
| 385 |
|
|
do k = 1,n |
| 386 |
|
|
tdt_rad(:,:,k) = (net(:,:,k+1) - net(:,:,k) - solar_down(:,:,k+1) + solar_down(:,:,k)) & |
| 387 |
|
|
*grav/(cp_air*(p_half(:,:,k+1)-p_half(:,:,k))) |
| 388 |
|
|
tdt_sw(:,:,k) = (- solar_down(:,:,k+1) + solar_down(:,:,k)) & |
| 389 |
|
|
*grav/(cp_air*(p_half(:,:,k+1)-p_half(:,:,k))) |
| 390 |
|
|
tdt(:,:,k) = tdt(:,:,k) + tdt_rad(:,:,k) |
| 391 |
|
|
end do |
| 392 |
|
|
|
| 393 |
|
|
olr = up(:,:,1) |
| 394 |
|
|
|
| 395 |
|
|
!------- outgoing lw flux toa (olr) ------- |
| 396 |
|
|
! if ( id_olr > 0 ) then |
| 397 |
|
|
! used = send_data ( id_olr, olr, Time_diag) |
| 398 |
|
|
! endif |
| 399 |
|
|
!------- upward lw flux surface ------- |
| 400 |
|
|
! if ( id_lwup_sfc > 0 ) then |
| 401 |
|
|
! used = send_data ( id_lwup_sfc, b_surf, Time_diag) |
| 402 |
|
|
! endif |
| 403 |
|
|
!------- temperature tendency due to radiation ------------ |
| 404 |
|
|
! if ( id_tdt_rad > 0 ) then |
| 405 |
|
|
! used = send_data ( id_tdt_rad, tdt_rad, Time_diag) |
| 406 |
|
|
! endif |
| 407 |
|
|
! if ( id_tdt_sw > 0 ) then |
| 408 |
|
|
! used = send_data ( id_tdt_sw, tdt_sw, Time_diag) |
| 409 |
|
|
! endif |
| 410 |
|
|
!------- total radiative flux (at half levels) ----------- |
| 411 |
|
|
! if ( id_flux_rad > 0 ) then |
| 412 |
|
|
! used = send_data ( id_flux_rad, flux_rad, Time_diag) |
| 413 |
|
|
! endif |
| 414 |
|
|
!------- longwave radiative flux (at half levels) -------- |
| 415 |
|
|
! if ( id_flux_lw > 0 ) then |
| 416 |
|
|
! used = send_data ( id_flux_lw, net, Time_diag) |
| 417 |
|
|
! endif |
| 418 |
|
|
! if ( id_flux_sw > 0 ) then |
| 419 |
|
|
! used = send_data ( id_flux_sw, flux_sw, Time_diag) |
| 420 |
|
|
! endif |
| 421 |
|
|
! if ( id_entrop_rad > 0 ) then |
| 422 |
|
|
! do k=1,n |
| 423 |
|
|
! entrop_rad(:,:,k) =tdt_rad(:,:,k)/t(:,:,k)*p_half(:,:,n+1)/1.e5 |
| 424 |
|
|
! end do |
| 425 |
|
|
! used = send_data ( id_entrop_rad, entrop_rad, Time_diag) |
| 426 |
|
|
! endif |
| 427 |
|
|
|
| 428 |
|
|
! ------------------------------------------------------------------------- |
| 429 |
|
|
deallocate (tdt_rad, tdt_sw, entrop_rad) |
| 430 |
jmc |
1.2 |
deallocate (up, net, flux_rad, flux_sw) |
| 431 |
jmc |
1.1 |
deallocate (b_surf) |
| 432 |
|
|
! ------------------------------------------------------------------------- |
| 433 |
|
|
|
| 434 |
|
|
return |
| 435 |
|
|
end subroutine radiation_up |
| 436 |
|
|
|
| 437 |
|
|
! ================================================================================== |
| 438 |
|
|
|
| 439 |
|
|
subroutine radiation_end |
| 440 |
|
|
|
| 441 |
|
|
!deallocate (b, tdt_rad, tdt_sw, entrop_rad) |
| 442 |
|
|
!!deallocate (up, down, net, solar_down, flux_rad, flux_sw) |
| 443 |
|
|
!deallocate (up, net, flux_rad, flux_sw) |
| 444 |
|
|
!deallocate (b_surf, olr, swin, albedo) |
| 445 |
|
|
!!deallocate (dtrans) |
| 446 |
|
|
!deallocate (tau, solar_tau) |
| 447 |
|
|
!deallocate (ss, solar, tau_0, solar_tau_0, p2) |
| 448 |
|
|
|
| 449 |
|
|
end subroutine radiation_end |
| 450 |
|
|
|
| 451 |
|
|
! ================================================================================== |
| 452 |
|
|
|
| 453 |
|
|
end module radiation_mod |
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