| 1 | ! radiation_interface.F90 - Monochromatic gas/cloud optics for testing |
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| 2 | ! |
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| 3 | ! (C) Copyright 2014- ECMWF. |
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| 4 | ! |
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| 5 | ! This software is licensed under the terms of the Apache Licence Version 2.0 |
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| 6 | ! which can be obtained at http://www.apache.org/licenses/LICENSE-2.0. |
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| 7 | ! |
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| 8 | ! In applying this licence, ECMWF does not waive the privileges and immunities |
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| 9 | ! granted to it by virtue of its status as an intergovernmental organisation |
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| 10 | ! nor does it submit to any jurisdiction. |
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| 11 | ! |
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| 12 | ! Author: Robin Hogan |
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| 13 | ! Email: r.j.hogan@ecmwf.int |
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| 14 | ! |
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| 15 | ! Modifications |
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| 16 | ! 2017-04-11 R. Hogan Receive "surface" dummy argument |
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| 17 | ! 2017-09-13 R. Hogan Revert |
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| 18 | ! 2018-08-29 R. Hogan Particulate single-scattering albedo / asymmetry from namelist |
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| 19 | |
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| 20 | module radiation_monochromatic |
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| 21 | |
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| 22 | implicit none |
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| 23 | |
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| 24 | public :: setup_gas_optics, gas_optics, set_gas_units, & |
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| 25 | & setup_cloud_optics, cloud_optics, & |
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| 26 | & setup_aerosol_optics, add_aerosol_optics |
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| 27 | |
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| 28 | contains |
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| 29 | |
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| 30 | ! Provides elemental function "delta_eddington" |
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| 31 | #include "radiation_delta_eddington.h" |
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| 32 | |
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| 33 | !--------------------------------------------------------------------- |
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| 34 | ! Setup the arrays in the config object corresponding to the |
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| 35 | ! monochromatic gas optics model. The directory argument is not |
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| 36 | ! used, since no look-up tables need to be loaded. |
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| 37 | subroutine setup_gas_optics(config, directory) |
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| 38 | |
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| 39 | use radiation_config, only : config_type |
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| 40 | |
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| 41 | type(config_type), intent(inout) :: config |
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| 42 | character(len=*), intent(in) :: directory |
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| 43 | |
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| 44 | ! In the monochromatic model we have simply one band and g-point |
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| 45 | ! in both the longwave and shortwave parts of the spectrum |
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| 46 | config%n_g_sw = 1 |
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| 47 | config%n_g_lw = 1 |
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| 48 | config%n_bands_sw = 1 |
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| 49 | config%n_bands_lw = 1 |
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| 50 | |
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| 51 | ! Allocate arrays |
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| 52 | allocate(config%i_band_from_g_sw (config%n_g_sw)) |
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| 53 | allocate(config%i_band_from_g_lw (config%n_g_lw)) |
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| 54 | allocate(config%i_band_from_reordered_g_sw(config%n_g_sw)) |
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| 55 | allocate(config%i_band_from_reordered_g_lw(config%n_g_lw)) |
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| 56 | allocate(config%i_g_from_reordered_g_sw(config%n_g_sw)) |
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| 57 | allocate(config%i_g_from_reordered_g_lw(config%n_g_lw)) |
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| 58 | |
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| 59 | ! Indices are trivial... |
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| 60 | config%i_band_from_g_sw = 1 |
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| 61 | config%i_band_from_g_lw = 1 |
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| 62 | config%i_g_from_reordered_g_sw = 1 |
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| 63 | config%i_g_from_reordered_g_lw = 1 |
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| 64 | config%i_band_from_reordered_g_sw = 1 |
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| 65 | config%i_band_from_reordered_g_lw = 1 |
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| 66 | |
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| 67 | end subroutine setup_gas_optics |
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| 68 | |
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| 69 | |
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| 70 | !--------------------------------------------------------------------- |
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| 71 | ! Dummy routine for scaling gas mixing ratios |
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| 72 | subroutine set_gas_units(gas) |
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| 73 | |
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| 74 | use radiation_gas, only : gas_type |
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| 75 | type(gas_type), intent(inout) :: gas |
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| 76 | |
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| 77 | end subroutine set_gas_units |
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| 78 | |
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| 79 | |
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| 80 | !--------------------------------------------------------------------- |
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| 81 | ! Dummy setup routine for cloud optics: in fact, no setup is |
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| 82 | ! required for monochromatic case |
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| 83 | subroutine setup_cloud_optics(config) |
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| 84 | |
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| 85 | use radiation_config, only : config_type |
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| 86 | type(config_type), intent(inout) :: config |
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| 87 | |
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| 88 | end subroutine setup_cloud_optics |
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| 89 | |
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| 90 | |
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| 91 | !--------------------------------------------------------------------- |
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| 92 | ! Dummy subroutine since no aerosols are represented in |
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| 93 | ! monochromatic case |
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| 94 | subroutine setup_aerosol_optics(config) |
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| 95 | |
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| 96 | use radiation_config, only : config_type |
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| 97 | type(config_type), intent(inout) :: config |
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| 98 | |
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| 99 | end subroutine setup_aerosol_optics |
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| 100 | |
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| 101 | |
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| 102 | !--------------------------------------------------------------------- |
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| 103 | ! Compute gas optical depths, shortwave scattering, Planck function |
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| 104 | ! and incoming shortwave radiation at top-of-atmosphere |
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| 105 | subroutine gas_optics(ncol,nlev,istartcol,iendcol, & |
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| 106 | config, single_level, thermodynamics, gas, lw_albedo, & |
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| 107 | od_lw, od_sw, ssa_sw, planck_hl, lw_emission, & |
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| 108 | incoming_sw) |
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| 109 | |
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| 110 | use parkind1, only : jprb |
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| 111 | use radiation_config, only : config_type |
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| 112 | use radiation_thermodynamics, only : thermodynamics_type |
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| 113 | use radiation_single_level, only : single_level_type |
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| 114 | use radiation_gas, only : gas_type |
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| 115 | use radiation_constants, only : Pi, StefanBoltzmann |
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| 116 | |
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| 117 | ! Inputs |
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| 118 | integer, intent(in) :: ncol ! number of columns |
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| 119 | integer, intent(in) :: nlev ! number of model levels |
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| 120 | integer, intent(in) :: istartcol, iendcol ! range of columns to process |
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| 121 | type(config_type), intent(in) :: config |
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| 122 | type(single_level_type), intent(in) :: single_level |
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| 123 | type(thermodynamics_type),intent(in) :: thermodynamics |
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| 124 | type(gas_type), intent(in) :: gas |
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| 125 | |
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| 126 | ! Longwave albedo of the surface |
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| 127 | real(jprb), dimension(config%n_g_lw,istartcol:iendcol), & |
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| 128 | & intent(in) :: lw_albedo |
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| 129 | |
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| 130 | ! Outputs |
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| 131 | |
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| 132 | ! Gaseous layer optical depth in longwave and shortwave, and |
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| 133 | ! shortwave single scattering albedo (i.e. fraction of extinction |
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| 134 | ! due to Rayleigh scattering) at each g-point |
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| 135 | real(jprb), dimension(config%n_g_lw,nlev,istartcol:iendcol), intent(out) :: & |
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| 136 | & od_lw |
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| 137 | real(jprb), dimension(config%n_g_sw,nlev,istartcol:iendcol), intent(out) :: & |
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| 138 | & od_sw, ssa_sw |
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| 139 | |
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| 140 | ! The Planck function (emitted flux from a black body) at half |
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| 141 | ! levels and at the surface at each longwave g-point |
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| 142 | real(jprb), dimension(config%n_g_lw,nlev+1,istartcol:iendcol), intent(out) :: & |
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| 143 | & planck_hl |
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| 144 | real(jprb), dimension(config%n_g_lw,istartcol:iendcol), intent(out) :: & |
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| 145 | & lw_emission |
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| 146 | |
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| 147 | ! The incoming shortwave flux into a plane perpendicular to the |
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| 148 | ! incoming radiation at top-of-atmosphere in each of the shortwave |
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| 149 | ! g-points |
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| 150 | real(jprb), dimension(config%n_g_sw,istartcol:iendcol), intent(out) :: & |
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| 151 | & incoming_sw |
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| 152 | |
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| 153 | ! Ratio of the optical depth of the entire atmospheric column that |
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| 154 | ! is in the current layer |
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| 155 | real(jprb), dimension(istartcol:iendcol) :: extinction_fraction |
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| 156 | |
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| 157 | ! In the monochromatic model, the absorption by the atmosphere is |
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| 158 | ! assumed proportional to the mass in each layer, so is defined in |
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| 159 | ! terms of a total zenith optical depth and then distributed with |
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| 160 | ! height according to the pressure. |
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| 161 | !real(jprb), parameter :: total_od_sw = 0.10536_jprb ! Transmittance 0.9 |
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| 162 | !real(jprb), parameter :: total_od_lw = 1.6094_jprb ! Transmittance 0.2 |
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| 163 | |
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| 164 | integer :: jlev |
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| 165 | |
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| 166 | do jlev = 1,nlev |
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| 167 | ! The fraction of the total optical depth in the current layer |
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| 168 | ! is proportional to the fraction of the mass of the atmosphere |
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| 169 | ! in the current layer, computed from pressure assuming |
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| 170 | ! hydrostatic balance |
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| 171 | extinction_fraction = & |
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| 172 | & (thermodynamics%pressure_hl(istartcol:iendcol,jlev+1) & |
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| 173 | & -thermodynamics%pressure_hl(istartcol:iendcol,jlev)) & |
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| 174 | & /thermodynamics%pressure_hl(istartcol:iendcol,nlev) |
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| 175 | |
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| 176 | ! Assign longwave and shortwave optical depths |
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| 177 | od_lw(1,jlev,:) = config%mono_lw_total_od*extinction_fraction |
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| 178 | od_sw(1,jlev,:) = config%mono_sw_total_od*extinction_fraction |
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| 179 | end do |
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| 180 | |
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| 181 | ! Shortwave single-scattering albedo is almost entirely Rayleigh |
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| 182 | ! scattering |
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| 183 | ssa_sw = 0.999999_jprb |
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| 184 | |
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| 185 | ! Entire shortwave spectrum represented in one band |
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| 186 | incoming_sw(1,:) = single_level%solar_irradiance |
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| 187 | |
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| 188 | if (single_level%is_simple_surface) then |
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| 189 | if (config%mono_lw_wavelength <= 0.0_jprb) then |
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| 190 | ! Entire longwave spectrum represented in one band |
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| 191 | lw_emission(1,istartcol:iendcol) & |
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| 192 | & = StefanBoltzmann * single_level%skin_temperature(istartcol:iendcol)**4 & |
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| 193 | & * single_level%lw_emissivity(istartcol:iendcol,1) |
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| 194 | do jlev = 1,nlev+1 |
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| 195 | planck_hl(1,jlev,istartcol:iendcol) = StefanBoltzmann * thermodynamics%temperature_hl(istartcol:iendcol,jlev)**4 |
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| 196 | end do |
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| 197 | else |
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| 198 | ! Single wavelength: multiply by pi to convert W sr-1 m-3 to W m-3 |
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| 199 | lw_emission(1,istartcol:iendcol) = Pi*planck_function(config%mono_lw_wavelength, & |
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| 200 | & single_level%skin_temperature(istartcol:iendcol)) & |
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| 201 | & * single_level%lw_emissivity(istartcol:iendcol,1) |
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| 202 | do jlev = 1,nlev+1 |
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| 203 | planck_hl(1,jlev,istartcol:iendcol) = Pi*planck_function(config%mono_lw_wavelength, & |
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| 204 | & thermodynamics%temperature_hl(istartcol:iendcol,jlev)) |
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| 205 | end do |
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| 206 | end if |
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| 207 | else |
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| 208 | lw_emission = transpose(single_level%lw_emission) |
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| 209 | end if |
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| 210 | |
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| 211 | end subroutine gas_optics |
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| 212 | |
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| 213 | |
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| 214 | !--------------------------------------------------------------------- |
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| 215 | ! Compute cloud optical depth, single-scattering albedo and |
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| 216 | ! g factor in the longwave and shortwave |
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| 217 | subroutine cloud_optics(nlev,istartcol,iendcol, & |
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| 218 | & config, thermodynamics, cloud, & |
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| 219 | & od_lw_cloud, ssa_lw_cloud, g_lw_cloud, & |
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| 220 | & od_sw_cloud, ssa_sw_cloud, g_sw_cloud) |
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| 221 | |
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| 222 | use parkind1, only : jprb |
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| 223 | use radiation_config, only : config_type |
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| 224 | use radiation_thermodynamics, only : thermodynamics_type |
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| 225 | use radiation_cloud, only : cloud_type |
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| 226 | use radiation_constants, only : AccelDueToGravity, & |
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| 227 | & DensityLiquidWater, DensitySolidIce |
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| 228 | |
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| 229 | ! Inputs |
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| 230 | integer, intent(in) :: nlev ! number of model levels |
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| 231 | integer, intent(in) :: istartcol, iendcol ! range of columns to process |
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| 232 | type(config_type), intent(in) :: config |
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| 233 | type(thermodynamics_type),intent(in) :: thermodynamics |
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| 234 | type(cloud_type), intent(in) :: cloud |
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| 235 | |
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| 236 | ! Outputs |
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| 237 | |
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| 238 | ! Layer optical depth, single scattering albedo and g factor of |
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| 239 | ! clouds in each longwave band, where the latter two |
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| 240 | ! variables are only defined if cloud longwave scattering is |
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| 241 | ! enabled (otherwise both are treated as zero). |
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| 242 | real(jprb), dimension(config%n_bands_lw,nlev,istartcol:iendcol), intent(out) :: & |
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| 243 | & od_lw_cloud |
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| 244 | real(jprb), dimension(config%n_bands_lw_if_scattering,nlev,istartcol:iendcol), & |
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| 245 | & intent(out) :: ssa_lw_cloud, g_lw_cloud |
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| 246 | |
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| 247 | ! Layer optical depth, single scattering albedo and g factor of |
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| 248 | ! clouds in each shortwave band |
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| 249 | real(jprb), dimension(config%n_g_sw,nlev,istartcol:iendcol), intent(out) :: & |
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| 250 | & od_sw_cloud, ssa_sw_cloud, g_sw_cloud |
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| 251 | |
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| 252 | ! In-cloud liquid and ice water path in a layer, in kg m-2 |
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| 253 | real(jprb), dimension(nlev,istartcol:iendcol) :: lwp_kg_m2, iwp_kg_m2 |
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| 254 | |
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| 255 | integer :: jlev, jcol |
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| 256 | |
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| 257 | ! Factor to convert from gridbox-mean mass mixing ratio to |
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| 258 | ! in-cloud water path |
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| 259 | real(jprb) :: factor |
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| 260 | |
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| 261 | ! Convert cloud mixing ratio into liquid and ice water path |
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| 262 | ! in each layer |
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| 263 | do jlev = 1, nlev |
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| 264 | do jcol = istartcol, iendcol |
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| 265 | ! Factor to convert from gridbox-mean mass mixing ratio to |
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| 266 | ! in-cloud water path involves the pressure difference in |
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| 267 | ! Pa, acceleration due to gravity and cloud fraction |
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| 268 | ! adjusted to avoid division by zero. |
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| 269 | factor = ( thermodynamics%pressure_hl(jcol,jlev+1) & |
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| 270 | & -thermodynamics%pressure_hl(jcol,jlev ) ) & |
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| 271 | & / (AccelDueToGravity & |
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| 272 | & * max(epsilon(1.0_jprb), cloud%fraction(jcol,jlev))) |
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| 273 | lwp_kg_m2(jlev,jcol) = factor * cloud%q_liq(jcol,jlev) |
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| 274 | iwp_kg_m2(jlev,jcol) = factor * cloud%q_ice(jcol,jlev) |
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| 275 | end do |
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| 276 | end do |
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| 277 | |
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| 278 | ! Geometric optics approximation: particles treated as much larger |
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| 279 | ! than the wavelength in both shortwave and longwave |
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| 280 | od_sw_cloud(1,:,:) & |
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| 281 | & = (3.0_jprb/(2.0_jprb*DensityLiquidWater)) & |
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| 282 | & * lwp_kg_m2 / transpose(cloud%re_liq(istartcol:iendcol,:)) & |
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| 283 | & + (3.0_jprb / (2.0_jprb * DensitySolidIce)) & |
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| 284 | & * iwp_kg_m2 / transpose(cloud%re_ice(istartcol:iendcol,:)) |
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| 285 | od_lw_cloud(1,:,:) = lwp_kg_m2 * 137.22_jprb & |
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| 286 | & + (3.0_jprb / (2.0_jprb * DensitySolidIce)) & |
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| 287 | & * iwp_kg_m2 / transpose(cloud%re_ice(istartcol:iendcol,:)) |
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| 288 | |
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| 289 | if (config%iverbose >= 4) then |
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| 290 | do jcol = istartcol,iendcol |
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| 291 | write(*,'(a,i0,a,f7.3,a,f7.3)') 'Profile ', jcol, ': shortwave optical depth = ', & |
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| 292 | & sum(od_sw_cloud(1,:,jcol)*cloud%fraction(jcol,:)), & |
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| 293 | & ', longwave optical depth = ', & |
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| 294 | & sum(od_lw_cloud(1,:,jcol)*cloud%fraction(jcol,:)) |
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| 295 | ! print *, 'LWP = ', sum(lwp_kg_m2(:,istartcol)*cloud%fraction(istartcol,:)) |
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| 296 | end do |
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| 297 | end if |
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| 298 | |
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| 299 | ssa_sw_cloud = config%mono_sw_single_scattering_albedo |
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| 300 | g_sw_cloud = config%mono_sw_asymmetry_factor |
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| 301 | |
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| 302 | ! In-place delta-Eddington scaling |
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| 303 | call delta_eddington(od_sw_cloud, ssa_sw_cloud, g_sw_cloud) |
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| 304 | |
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| 305 | if (config%do_lw_cloud_scattering) then |
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| 306 | ssa_lw_cloud = config%mono_lw_single_scattering_albedo |
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| 307 | g_lw_cloud = config%mono_lw_asymmetry_factor |
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| 308 | ! In-place delta-Eddington scaling |
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| 309 | call delta_eddington(od_lw_cloud, ssa_lw_cloud, g_lw_cloud) |
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| 310 | end if |
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| 311 | |
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| 312 | end subroutine cloud_optics |
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| 313 | |
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| 314 | |
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| 315 | !--------------------------------------------------------------------- |
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| 316 | ! Dummy subroutine since no aerosols are represented in |
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| 317 | ! monochromatic case |
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| 318 | subroutine add_aerosol_optics(nlev,istartcol,iendcol, & |
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| 319 | & config, thermodynamics, gas, aerosol, & |
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| 320 | & od_lw, ssa_lw, g_lw, od_sw, ssa_sw, g_sw) |
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| 321 | |
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| 322 | use parkind1, only : jprb |
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| 323 | |
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| 324 | use radiation_config, only : config_type |
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| 325 | use radiation_thermodynamics, only : thermodynamics_type |
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| 326 | use radiation_gas, only : gas_type |
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| 327 | use radiation_aerosol, only : aerosol_type |
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| 328 | |
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| 329 | integer, intent(in) :: nlev ! number of model levels |
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| 330 | integer, intent(in) :: istartcol, iendcol ! range of columns to process |
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| 331 | type(config_type), intent(in), target :: config |
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| 332 | type(thermodynamics_type),intent(in) :: thermodynamics |
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| 333 | type(gas_type), intent(in) :: gas |
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| 334 | type(aerosol_type), intent(in) :: aerosol |
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| 335 | ! Optical depth, single scattering albedo and asymmetry factor of |
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| 336 | ! the atmosphere (gases on input, gases and aerosols on output) |
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| 337 | ! for each g point. Note that longwave ssa and asymmetry and |
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| 338 | ! shortwave asymmetry are all zero for gases, so are not yet |
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| 339 | ! defined on input and are therefore intent(out). |
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| 340 | real(jprb), dimension(config%n_g_lw,nlev,istartcol:iendcol), intent(inout) :: od_lw |
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| 341 | real(jprb), dimension(config%n_g_lw_if_scattering,nlev,istartcol:iendcol), & |
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| 342 | & intent(out) :: ssa_lw, g_lw |
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| 343 | real(jprb), dimension(config%n_g_sw,nlev,istartcol:iendcol), intent(inout) & |
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| 344 | & :: od_sw, ssa_sw |
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| 345 | real(jprb), dimension(config%n_g_sw,nlev,istartcol:iendcol), intent(out) :: g_sw |
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| 346 | |
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| 347 | g_sw(:,:,istartcol:iendcol) = 0.0_jprb |
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| 348 | |
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| 349 | if (config%do_lw_aerosol_scattering) then |
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| 350 | ssa_lw(:,:,istartcol:iendcol) = 0.0_jprb |
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| 351 | g_lw(:,:,istartcol:iendcol) = 0.0_jprb |
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| 352 | end if |
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| 353 | |
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| 354 | end subroutine add_aerosol_optics |
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| 355 | |
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| 356 | !--------------------------------------------------------------------- |
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| 357 | ! Planck function in terms of wavelength |
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| 358 | elemental function planck_function(wavelength, temperature) |
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| 359 | |
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| 360 | use parkind1, only : jprb |
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| 361 | |
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| 362 | use radiation_constants, only : BoltzmannConstant, PlanckConstant, & |
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| 363 | & SpeedOfLight |
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| 364 | |
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| 365 | real(jprb), intent(in) :: wavelength ! metres |
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| 366 | real(jprb), intent(in) :: temperature ! Kelvin |
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| 367 | |
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| 368 | ! Output in W sr-1 m-3 |
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| 369 | real(jprb) :: planck_function |
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| 370 | |
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| 371 | if (temperature > 0.0_jprb) then |
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| 372 | planck_function = 2.0_jprb * PlanckConstant * SpeedOfLight**2 & |
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| 373 | & / (wavelength**5 & |
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| 374 | & * (exp(PlanckConstant*SpeedOfLight & |
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| 375 | & /(wavelength*BoltzmannConstant*temperature)) - 1.0_jprb)) |
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| 376 | else |
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| 377 | planck_function = 0.0_jprb |
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| 378 | end if |
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| 379 | |
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| 380 | end function planck_function |
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| 381 | |
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| 382 | end module radiation_monochromatic |
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