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mixed_layer.F90
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!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!! !!
!! GNU General Public License !!
!! !!
!! This file is part of the Flexible Modeling System (FMS). !!
!! !!
!! FMS is free software; you can redistribute it and/or modify it !!
!! under the terms of the GNU General Public License as published by !!
!! the Free Software Foundation, either version 3 of the License, or !!
!! (at your option) any later version. !!
!! !!
!! FMS is distributed in the hope that it will be useful, !!
!! but WITHOUT ANY WARRANTY; without even the implied warranty of !!
!! MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the !!
!! GNU General Public License for more details. !!
!! !!
!! You should have received a copy of the GNU General Public License !!
!! along with FMS. if not, see: http://www.gnu.org/licenses/gpl.txt !!
!! !!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
module mixed_layer_mod
!
! Implementation of mixed layer boundary condition
!
use fms_mod, only: set_domain, write_version_number, &
mpp_pe, mpp_root_pe, error_mesg, NOTE, FATAL, WARNING
use fms_mod, only: stdlog, check_nml_error, close_file,&
open_namelist_file, stdout, file_exist, &
read_data, write_data, open_file, &
nullify_domain, lowercase, field_size
use field_manager_mod, only: MODEL_ATMOS
use tracer_manager_mod, only: get_tracer_names, get_number_tracers
use constants_mod, only: HLV, PI, RHO_CP, CP_AIR, KELVIN
use diag_manager_mod, only: register_diag_field, register_static_field, send_data
use time_manager_mod, only: time_type
#ifdef COLUMN_MODEL
use column_grid_mod, only: get_deg_lon, get_deg_lat
use column_mod, only: get_surf_geopotential
use spec_mpp_mod, only: grid_domain
#else
use transforms_mod, only: get_deg_lat, get_deg_lon, grid_domain
! mj know about surface topography
use spectral_dynamics_mod,only: get_surf_geopotential
#endif
use vert_diff_mod, only: surf_diff_type
use mpp_domains_mod, only: mpp_get_global_domain !s added to enable qflux reading
! mj read SSTs
use interpolator_mod, only: interpolate_type,interpolator_init&
&,CONSTANT,interpolator
!mj q-flux
use qflux_mod, only: qflux_init,qflux,warmpool
implicit none
private
!=================================================================================================================================
character(len=128) :: version= &
'$Id: mixed_layer.F90,v 1.1.2.1 2013/01/24 20:35:37 pjp Exp $'
character(len=128) :: tagname= &
'$Name: $'
character(len=128), parameter :: mod_name='mixed_layer'
!=================================================================================================================================
public :: mixed_layer_init, mixed_layer, mixed_layer_end, albedo_calc
!=================================================================================================================================
logical :: evaporation = .true.
real :: qflux_amp = 0.0
real :: qflux_width = 16.0 ! width of qflux region in degrees
logical :: load_qflux = .false.
logical :: time_varying_qflux = .false.
real :: tconst = 305.0
real :: delta_T = 40.0
logical :: prescribe_initial_dist = .false.
real :: albedo_value = 0.06
!s Surface heat capacity options
real :: depth = 40.0, & !s 2013 implementation
land_depth = -1., & !mj 2013
trop_depth = -1., & !mj 2013
trop_cap_limit = 15., & !mj
heat_cap_limit = 60., & !mj
np_cap_factor = 1., & !mj
albedo_exp = 2., & !mj
albedo_cntr = 45., & !mj
albedo_wdth = 10., & !mj
higher_albedo = 0.10, & !mj
lat_glacier = 60., & !mj
land_h_capacity_prefactor = 1.0 !s where(land) heat_capcity = land_h_capacity_prefactor * depth * rho_cp
!s Surface albedo options
real :: land_albedo_prefactor = 1.0 !s where(land) albedo = land_albedo_prefactor * albedo_value
!s Begin mj extra options
integer :: albedo_choice = 1 ! 1->constant or following 'where(land)', 2->NH or SH step, 3->N-S symmetric step, 4->profile with albedo_exp, 5->tanh with albedo_cntr,albedo_wdth
logical :: do_qflux = .false. !mj
logical :: do_warmpool = .false. !mj
logical :: do_read_sst = .false. !mj
logical :: do_sc_sst = .false. !mj use specified SSTs
logical :: do_ape_sst = .false. ! use the AquaPlanet Experiement (APE) sst profile.
logical :: specify_sst_over_ocean_only = .false.
logical :: do_calc_eff_heat_cap = .true. ! assumes specified SST are off the default.
character(len=256) :: sst_file
character(len=256) :: land_option = 'none'
real,dimension(10) :: slandlon=0,slandlat=0,elandlon=-1,elandlat=-1
!s End mj extra options
character(len=256) :: qflux_file_name = 'ocean_qflux'
character(len=256) :: qflux_field_name = 'ocean_qflux' !Only used when using a non-time-varying q-flux. Otherwise code assumes field_name = file_name.
character(len=256) :: ice_file_name = 'siconc_clim_amip'
real :: ice_albedo_value = 0.7
real :: ice_concentration_threshold = 0.5
logical :: update_albedo_from_ice = .false.
character(len=256) :: ice_albedo_method = 'step_function'
logical :: add_latent_heat_flux_anom = .false.
character(len=256) :: flux_lhe_anom_file_name = 'INPUT/flux_lhe_anom.nc'
character(len=256) :: flux_lhe_anom_field_name = 'flux_lhe_anom'
namelist/mixed_layer_nml/ evaporation, depth, qflux_amp, qflux_width, tconst,&
delta_T, prescribe_initial_dist,albedo_value, &
land_depth,trop_depth, & !mj
trop_cap_limit, heat_cap_limit, np_cap_factor, & !mj
do_qflux,do_warmpool, & !mj
albedo_choice,higher_albedo,albedo_exp, & !mj
albedo_cntr,albedo_wdth,lat_glacier, & !mj
do_read_sst,do_sc_sst,sst_file, & !mj
land_option,slandlon,slandlat, & !mj
elandlon,elandlat, & !mj
land_h_capacity_prefactor, & !s
land_albedo_prefactor, & !s
load_qflux,qflux_file_name,time_varying_qflux, &
update_albedo_from_ice, ice_file_name, &
ice_albedo_value, specify_sst_over_ocean_only, &
ice_concentration_threshold, ice_albedo_method,&
add_latent_heat_flux_anom,flux_lhe_anom_file_name,&
flux_lhe_anom_field_name, do_ape_sst, qflux_field_name
!=================================================================================================================================
logical :: module_is_initialized =.false.
logical :: used
integer :: iter, nhum
integer, dimension(4) :: axes
integer :: &
id_t_surf, & ! surface temperature
id_flux_lhe, & ! latent heat flux at surface
id_flux_oceanq, & ! oceanic Q flux
id_flux_t, & ! sensible heat flux at surface
id_heat_cap, & ! heat capacity
id_albedo, & ! mj albedo
id_ice_conc, & ! st ice concentration
id_delta_t_surf
real, allocatable, dimension(:,:) :: &
ocean_qflux, & ! Q-flux
ice_concentration, & ! ice_concentration
rad_lat_2d, & ! latitude in radians
flux_lhe_anom, flux_q_total
real, allocatable, dimension(:) :: deg_lat, deg_lon
real, allocatable, dimension(:,:) :: &
gamma_t, & ! Used to calculate the implicit
gamma_q, & ! correction to the diffusion in
fn_t, & ! the lowest layer
fn_q, & !
en_t, & !
en_q, & !
alpha_t, & !
alpha_q, & !
alpha_lw, & !
beta_t, & !
beta_q, & !
beta_lw, & !
t_surf_dependence, & !
corrected_flux, & !
eff_heat_capacity, & ! Effective heat capacity
delta_t_surf, & ! Increment in surface temperature
zsurf, & ! mj know about topography
land_sea_heat_capacity,&
sst_new, & ! mj input SST
albedo_initial
logical, allocatable, dimension(:,:) :: land_mask
!mj read sst from input file
type(interpolate_type),save :: sst_interp
type(interpolate_type),save :: qflux_interp
type(interpolate_type),save :: ice_interp
type(interpolate_type),save :: flux_lhe_anom_interp
real inv_cp_air
!=================================================================================================================================
contains
!=================================================================================================================================
subroutine mixed_layer_init(is, ie, js, je, num_levels, t_surf, bucket_depth, axes, Time, albedo, rad_lonb_2d,rad_latb_2d, land, restart_file_bucket_depth)
type(time_type), intent(in) :: Time
real, intent(out), dimension(:,:) :: t_surf, albedo
real, intent(out), dimension(:,:,:) :: bucket_depth
integer, intent(in), dimension(4) :: axes
real, intent(in), dimension(:,:) :: rad_lonb_2d, rad_latb_2d
integer, intent(in) :: is, ie, js, je, num_levels
logical, intent(in), dimension(:,:) :: land
logical, intent(in) :: restart_file_bucket_depth
integer :: j
real :: rad_qwidth
integer:: ierr, io, unit, num_tr, n, global_num_lon, global_num_lat
character(32) :: tr_name
! mj shallower ocean in tropics, land-sea contrast
real :: trop_capacity,land_capacity,lon,lat,loc_cap
integer :: i,k
integer, dimension(4) :: siz
character(len=12) :: ctmp1=' by ', ctmp2=' by '
if(module_is_initialized) return
call write_version_number(version, tagname)
unit = open_namelist_file ()
ierr=1
do while (ierr /= 0)
read (unit, nml=mixed_layer_nml, iostat=io, end=10)
ierr = check_nml_error (io, 'mixed_layer_nml')
enddo
10 call close_file (unit)
if ( mpp_pe() == mpp_root_pe() ) write (stdlog(), nml=mixed_layer_nml)
call get_number_tracers (MODEL_ATMOS, num_prog=num_tr)
do n = 1,num_tr
call get_tracer_names( MODEL_ATMOS, n, tr_name )
if(lowercase(tr_name)=='sphum') then
nhum = n
endif
enddo
allocate(rad_lat_2d (is:ie, js:je))
allocate(ocean_qflux (is:ie, js:je))
allocate(ice_concentration (is:ie, js:je))
allocate(flux_lhe_anom (is:ie, js:je))
allocate(flux_q_total (is:ie, js:je))
allocate(deg_lat (js:je))
allocate(deg_lon (is:ie))
allocate(gamma_t (is:ie, js:je))
allocate(gamma_q (is:ie, js:je))
allocate(en_t (is:ie, js:je))
allocate(en_q (is:ie, js:je))
allocate(fn_t (is:ie, js:je))
allocate(fn_q (is:ie, js:je))
allocate(alpha_t (is:ie, js:je))
allocate(alpha_q (is:ie, js:je))
allocate(alpha_lw (is:ie, js:je))
allocate(beta_t (is:ie, js:je))
allocate(beta_q (is:ie, js:je))
allocate(beta_lw (is:ie, js:je))
allocate(delta_t_surf (is:ie, js:je))
allocate(eff_heat_capacity (is:ie, js:je))
allocate(corrected_flux (is:ie, js:je))
allocate(t_surf_dependence (is:ie, js:je))
allocate (albedo_initial (is:ie, js:je))
allocate(land_sea_heat_capacity (is:ie, js:je))
allocate(zsurf (is:ie, js:je))
allocate(sst_new (is:ie, js:je))
allocate(land_mask (is:ie, js:je)); land_mask=land
!
!see if restart file exists for the surface temperature
!
! latitude will be needed for oceanic q flux
!s Moved up slightly so that rad_lat_2d can be used in initial temperature distribution if necessary.
call get_deg_lat(deg_lat)
do j=js,je
rad_lat_2d(:,j) = deg_lat(j)*PI/180.
enddo
!mj get lon for land_sea_heat_capacity
call get_deg_lon(deg_lon)
!s Adding MiMA options
if(do_sc_sst) do_read_sst = .true.
trop_capacity = trop_depth*RHO_CP
land_capacity = land_depth*RHO_CP
if(trop_capacity .le. 0.) trop_capacity = depth*RHO_CP
if(land_capacity .le. 0.) land_capacity = depth*RHO_CP
!s End MiMA options
!mj read fixed SSTs
if( do_read_sst ) then
call interpolator_init( sst_interp, trim(sst_file)//'.nc', rad_lonb_2d, rad_latb_2d, data_out_of_bounds=(/CONSTANT/) )
endif
if (file_exist('INPUT/mixed_layer.res.nc')) then
call nullify_domain()
call read_data(trim('INPUT/mixed_layer.res'), 't_surf', t_surf, grid_domain)
if (restart_file_bucket_depth) then
call read_data(trim('INPUT/mixed_layer.res'), 'bucket_depth', bucket_depth, grid_domain)
endif
else if (file_exist('INPUT/swamp.res')) then
unit = open_file (file='INPUT/swamp.res', &
form='native', action='read')
call read_data (unit, t_surf)
call close_file (unit)
call error_mesg('mixed_layer','mixed_layer restart file not found, using swamp restart file', WARNING)
else if( do_read_sst ) then !s Added so that if we are reading sst values then we can restart using them.
call interpolator( sst_interp, Time, t_surf, trim(sst_file) )
elseif (prescribe_initial_dist) then
! call error_mesg('mixed_layer','mixed_layer restart file not found - initializing from prescribed distribution', WARNING)
t_surf(:,:) = tconst - delta_T*((3.*sin(rad_lat_2d)**2.)-1.)/3.
else
call error_mesg('mixed_layer','mixed_layer restart file not found - initializing from lowest model level temp', WARNING)
endif
if(trim(ice_albedo_method) == 'ramp_function') then
call error_mesg('mixed_layer','Alternative method ramp_function used for ice albedo output.', NOTE)
endif
id_t_surf = register_diag_field(mod_name, 't_surf', &
axes(1:2), Time, 'surface temperature','K')
id_flux_t = register_diag_field(mod_name, 'flux_t', &
axes(1:2), Time, 'sensible heat flux up at surface','watts/m2')
id_flux_lhe = register_diag_field(mod_name, 'flux_lhe', &
axes(1:2), Time, 'latent heat flux up at surface','watts/m2')
id_flux_oceanq = register_diag_field(mod_name, 'flux_oceanq', &
axes(1:2), Time, 'oceanic Q-flux','watts/m2')
id_heat_cap = register_static_field(mod_name, 'ml_heat_cap', &
axes(1:2), 'mixed layer heat capacity','joules/m^2/deg C')
id_delta_t_surf = register_diag_field(mod_name, 'delta_t_surf', &
axes(1:2), Time, 'change in sst','K')
if (update_albedo_from_ice) then
id_albedo = register_diag_field(mod_name, 'albedo', &
axes(1:2), Time, 'surface albedo', 'none')
id_ice_conc = register_diag_field(mod_name, 'ice_conc', &
axes(1:2), Time, 'ice_concentration', 'none')
else
id_albedo = register_static_field(mod_name, 'albedo', &
axes(1:2), 'surface albedo', 'none')
endif
ocean_qflux = 0.
! load Q flux
if (load_qflux) then
if (time_varying_qflux) then
call interpolator_init( qflux_interp, trim(qflux_file_name)//'.nc', rad_lonb_2d, rad_latb_2d, data_out_of_bounds=(/CONSTANT/) )
else
if(file_exist(trim('INPUT/'//qflux_file_name//'.nc'))) then
call mpp_get_global_domain(grid_domain, xsize=global_num_lon, ysize=global_num_lat)
call field_size(trim('INPUT/'//qflux_file_name//'.nc'), trim(qflux_field_name), siz)
if ( siz(1) == global_num_lon .or. siz(2) == global_num_lat ) then
call read_data(trim('INPUT/'//qflux_file_name//'.nc'), trim(qflux_field_name), ocean_qflux, grid_domain)
else
write(ctmp1(1: 4),'(i4)') siz(1)
write(ctmp1(9:12),'(i4)') siz(2)
write(ctmp2(1: 4),'(i4)') global_num_lon
write(ctmp2(9:12),'(i4)') global_num_lat
call error_mesg ('get_qflux','Qflux file contains data on a '// &
ctmp1//' grid, but atmos model grid is '//ctmp2, FATAL)
endif
else
call error_mesg('get_qflux','load_qflux="'//trim('True')//'"'// &
' but '//trim(qflux_file_name)//' does not exist', FATAL)
endif
endif
endif
!s Adding MiMA options for qfluxes.
if ( do_qflux .or. do_warmpool) then
call qflux_init
!mj q-flux as in Merlis et al (2013) [Part II]
if ( do_qflux ) call qflux(rad_latb_2d(1,:),ocean_qflux)
!mj q-flux to create a tropical temperature perturbation
if ( do_warmpool) call warmpool(rad_lonb_2d(:,1),rad_latb_2d(1,:),ocean_qflux)
endif
!s End MiMA options for qfluxes
if (add_latent_heat_flux_anom) then
call interpolator_init( flux_lhe_anom_interp, trim(flux_lhe_anom_file_name)//'.nc', rad_lonb_2d, rad_latb_2d, data_out_of_bounds=(/CONSTANT/) )
endif
inv_cp_air = 1.0 / CP_AIR
!s Prescribe albedo distribution here so that it will be the same in both two_stream_gray later and rrtmg radiation.
albedo(:,:) = albedo_value
if(trim(land_option) .eq. 'input') then
where(land) albedo = land_albedo_prefactor * albedo
endif
!mj MiMA albedo choices.
select case (albedo_choice)
case (2) ! higher_albedo northward (lat_glacier>0) or southward (lat_glacier <0 ) of lat_glacier
do j = 1, size(t_surf,2)
lat = deg_lat(js+j-1)
! mj SH or NH only
if ( lat_glacier .ge. 0. ) then
if ( lat > lat_glacier ) then
albedo(:,j) = higher_albedo
else
albedo(:,j) = albedo_value
endif
else
if ( lat < lat_glacier ) then
albedo(:,j) = higher_albedo
else
albedo(:,j) = albedo_value
endif
endif
enddo
case (3) ! higher_albedo poleward of lat_glacier
do j = 1, size(t_surf,2)
lat = deg_lat(js+j-1)
if ( abs(lat) > lat_glacier ) then
albedo(:,j) = higher_albedo
else
albedo(:,j) = albedo_value
endif
enddo
case (4) ! exponential increase with albedo_exp
do j = 1, size(t_surf,2)
lat = abs(deg_lat(js+j-1))
albedo(:,j) = albedo_value + (higher_albedo-albedo_value)*(lat/90.)**albedo_exp
enddo
case (5) ! tanh increase around albedo_cntr with albedo_wdth
do j = 1, size(t_surf,2)
lat = abs(deg_lat(js+j-1))
albedo(:,j) = albedo_value + (higher_albedo-albedo_value)*&
0.5*(1+tanh((lat-albedo_cntr)/albedo_wdth))
enddo
end select
albedo_initial=albedo
if (update_albedo_from_ice) then
call interpolator_init( ice_interp, trim(ice_file_name)//'.nc', rad_lonb_2d, rad_latb_2d, data_out_of_bounds=(/CONSTANT/) )
call read_ice_conc(Time)
call albedo_calc(albedo,Time)
else
if ( id_albedo > 0 ) used = send_data ( id_albedo, albedo )
endif
! Note: do_calc_eff_heat_cap is true by default and control when the surface
! heat capacity is calculated (land and ocean).
if (do_sc_sst) then
! if using specified sst then do not calc the heat capacity
if (specify_sst_over_ocean_only) then
! unless the heat capacity over land is needed
do_calc_eff_heat_cap = .true.
else
do_calc_eff_heat_cap = .false.
endif
else
if (do_ape_sst) then
! if using specified sst without land, do not calc the heat capacity
do_calc_eff_heat_cap = .false.
end if
endif
!s begin surface heat capacity calculation
if (do_calc_eff_heat_cap) then
land_sea_heat_capacity = depth*RHO_CP
if(trim(land_option) .ne. 'input') then
if ( trop_capacity .ne. depth*RHO_CP .or. np_cap_factor .ne. 1. ) then !s Lines above make trop_capacity=depth*RHO_CP if trop_capacity set to be < 0.
do j=js,je
lat = deg_lat(j)
if ( lat .gt. 0. ) then
loc_cap = depth*RHO_CP*np_cap_factor
else
loc_cap = depth*RHO_CP
endif
if ( abs(lat) .lt. trop_cap_limit ) then
land_sea_heat_capacity(:,j) = trop_capacity
elseif ( abs(lat) .lt. heat_cap_limit ) then
land_sea_heat_capacity(:,j) = trop_capacity*(1.-(abs(lat)-trop_cap_limit)/(heat_cap_limit-trop_cap_limit)) + (abs(lat)-trop_cap_limit)/(heat_cap_limit-trop_cap_limit)*loc_cap
elseif ( lat .gt. heat_cap_limit ) then
land_sea_heat_capacity(:,j) = loc_cap
end if
enddo
endif
! mj land heat capacity function of surface topography
if(trim(land_option) .eq. 'zsurf')then
call get_surf_geopotential(zsurf)
where ( zsurf .gt. 10. ) land_sea_heat_capacity = land_capacity
endif
! mj land heat capacity given through ?landlon, ?landlat
if(trim(land_option) .eq. 'lonlat')then
do j=js,je
lat = deg_lat(j)
do i=is,ie
lon = deg_lon(i)
do k=1,size(slandlat)
if ( lon .ge. slandlon(k) .and. lon .le. elandlon(k) &
&.and. lat .ge. slandlat(k) .and. lat .le. elandlat(k) )then
land_sea_heat_capacity(i,j) = land_capacity
endif
enddo
enddo
enddo
endif
else !trim(land_option) .eq. 'input'
where(land) land_sea_heat_capacity = land_h_capacity_prefactor*land_sea_heat_capacity
endif !end of if (trim(land_option) .ne. 'input')
endif !end of if(.not.do_sc_sst)
if ( id_heat_cap > 0 ) used = send_data ( id_heat_cap, land_sea_heat_capacity )
!s end surface heat capacity calculation
module_is_initialized = .true.
return
end subroutine mixed_layer_init
!=================================================================================================================================
subroutine mixed_layer ( &
Time, &
Time_next, &
js, je, &
t_surf, &
flux_t, &
flux_q, &
flux_r, &
dt, &
net_surf_sw_down, &
surf_lw_down, &
Tri_surf, &
dhdt_surf, &
dedt_surf, &
dedq_surf, &
drdt_surf, &
dhdt_atm, &
dedq_atm, &
albedo_out)
! ---- arguments -----------------------------------------------------------
type(time_type), intent(in) :: Time, Time_next
integer, intent(in) :: js, je
real, intent(in), dimension(:,:) :: net_surf_sw_down, surf_lw_down
real, intent(in), dimension(:,:) :: flux_t, flux_q, flux_r
real, intent(inout), dimension(:,:) :: t_surf
real, intent(in), dimension(:,:) :: dhdt_surf, dedt_surf, dedq_surf, &
drdt_surf, dhdt_atm, dedq_atm
real, intent(in) :: dt
real, intent(out), dimension(:,:) :: albedo_out
type(surf_diff_type), intent(inout) :: Tri_surf
logical, dimension(size(land_mask,1),size(land_mask,2)) :: land_ice_mask
!local variables
integer :: j
if(.not.module_is_initialized) then
call error_mesg('mixed_layer','mixed_layer module is not initialized',FATAL)
endif
if(update_albedo_from_ice) then
call read_ice_conc(Time_next)
land_ice_mask=.false.
where(land_mask.or.(ice_concentration.gt.ice_concentration_threshold))
land_ice_mask=.true.
end where
else
land_ice_mask=land_mask
endif
call albedo_calc(albedo_out,Time_next)
!s Add latent heat flux anomalies before any of the calculations take place
if (add_latent_heat_flux_anom) then
call interpolator( flux_lhe_anom_interp, Time, flux_lhe_anom, trim(flux_lhe_anom_file_name) )
flux_q_total = flux_q + flux_lhe_anom
else
flux_q_total = flux_q
endif
! Need to calculate the implicit changes to the lowest level delta_q and delta_t
! - see the discussion in vert_diff.tech.ps
! Care is needed to differentiate between the sensible heat flux and the
! diffusive flux of temperature
gamma_t = 1.0 / (1.0 - Tri_surf%dtmass * (Tri_surf%dflux_t + dhdt_atm * inv_cp_air))
gamma_q = 1.0 / (1.0 - Tri_surf%dtmass * (Tri_surf%dflux_tr(:,:,nhum) + dedq_atm))
fn_t = gamma_t * (Tri_surf%delta_t + Tri_surf%dtmass * flux_t * inv_cp_air)
fn_q = gamma_q * (Tri_surf%delta_tr(:,:,nhum) + Tri_surf%dtmass * flux_q_total)
en_t = gamma_t * Tri_surf%dtmass * dhdt_surf * inv_cp_air
en_q = gamma_q * Tri_surf%dtmass * dedt_surf
!
! Note flux_sw doesn't depend on surface or lowest layer values
! Note drdt_atm is not used - should be fixed
!
alpha_t = flux_t * inv_cp_air + dhdt_atm * inv_cp_air * fn_t
alpha_q = flux_q_total + dedq_atm * fn_q
alpha_lw = flux_r
beta_t = dhdt_surf * inv_cp_air + dhdt_atm * inv_cp_air * en_t
beta_q = dedt_surf + dedq_atm * en_q
beta_lw = drdt_surf
! If time-varying qflux then update value
if(load_qflux.and.time_varying_qflux) then
call interpolator( qflux_interp, Time, ocean_qflux, trim(qflux_file_name) )
if(update_albedo_from_ice) then
where (land_ice_mask) ocean_qflux=0.
endif
endif
!
! Implement mixed layer surface boundary condition
!
corrected_flux = - net_surf_sw_down - surf_lw_down + alpha_t * CP_AIR + alpha_lw - ocean_qflux
t_surf_dependence = beta_t * CP_AIR + beta_lw
if (evaporation) then
corrected_flux = corrected_flux + alpha_q * HLV
t_surf_dependence = t_surf_dependence + beta_q * HLV
endif
!s Surface heat_capacity calculation based on that in MiMA by mj
if(do_sc_sst) then !mj sst read from input file
! read at the new time, as that is what we are stepping to
call interpolator( sst_interp, Time_next, sst_new, trim(sst_file) )
if(specify_sst_over_ocean_only) then
where (.not.land_ice_mask) delta_t_surf = sst_new - t_surf
where (.not.land_ice_mask) t_surf = t_surf + delta_t_surf
else
delta_t_surf = sst_new - t_surf
t_surf = t_surf + delta_t_surf
endif
end if
if (do_ape_sst) then
!
! AquaPlanet Experiment protocol (APE) from
! Williams et al 2012 tech report: "The APE Atlas"
!
! use analytic form for setting SST at each timestep.
! see appendix equation 1 of Neale and Hoskins 2000
! "A standard test for AGCMs including their
! physical parametrizations: I: the proposal"
! using a constant longitude.
do j=js,je
if ( (rad_lat_2d(1,j) .gt. -PI/3.) .and. (rad_lat_2d(1,j) .lt. PI/3.) ) then
! between 60N-60S
sst_new(:,j) = KELVIN+( 27.0*( 1. - (sin( 3./2. * rad_lat_2d(:,j) )**2 ) ))
!write(6,*) 'SST profile', rad_lat_2d(1,j)*180/PI, ' j:', j, ' sst:', sst_new(1,j)
else
! from 60N/S to pole
sst_new(:,j) = KELVIN
!write(6,*) 'SST is zero', rad_lat_2d(1,j)*180/PI, ' j:', j, ' sst:', sst_new(1,j)
endif
enddo
delta_t_surf = sst_new - t_surf
t_surf = sst_new
endif
if (do_calc_eff_heat_cap) then
!s use the land_sea_heat_capacity calculated in mixed_layer_init
! Now update the mixed layer surface temperature using an implicit step
!
eff_heat_capacity = land_sea_heat_capacity + t_surf_dependence * dt !s need to investigate how this works
if (any(eff_heat_capacity .eq. 0.0)) then
write(*,*) 'mixed_layer: error', eff_heat_capacity
call error_mesg('mixed_layer', 'Avoiding division by zero',fatal)
end if
if(do_sc_sst.and.specify_sst_over_ocean_only) then
where (land_ice_mask) delta_t_surf = - corrected_flux * dt / eff_heat_capacity
where (land_ice_mask) t_surf = t_surf + delta_t_surf
else
delta_t_surf = - corrected_flux * dt / eff_heat_capacity
t_surf = t_surf + delta_t_surf
endif
endif !s end of if(do_sc_sst).
!
! Finally calculate the increments for the lowest atmospheric layer
!
Tri_surf%delta_t = fn_t + en_t * delta_t_surf
if (evaporation) Tri_surf%delta_tr(:,:,nhum) = fn_q + en_q * delta_t_surf
!
! Note:
! When using an implicit step there is not a clearly defined flux for a given timestep
! We have taken a time-step, send the values at the next time level.
if(id_t_surf > 0) used = send_data(id_t_surf, t_surf, Time_next)
if(id_flux_t > 0) used = send_data(id_flux_t, flux_t, Time_next)
if(id_flux_lhe > 0) used = send_data(id_flux_lhe, HLV * flux_q_total, Time_next)
if(id_flux_oceanq > 0) used = send_data(id_flux_oceanq, ocean_qflux, Time_next)
if(id_delta_t_surf > 0) used = send_data(id_delta_t_surf, delta_t_surf, Time_next)
end subroutine mixed_layer
!=================================================================================================================================
subroutine albedo_calc(albedo_inout,Time)
real, intent(out), dimension(:,:) :: albedo_inout
type(time_type), intent(in) :: Time
albedo_inout=albedo_initial
if(update_albedo_from_ice) then
if(trim(ice_albedo_method) == 'step_function') then
where(ice_concentration.gt.ice_concentration_threshold)
albedo_inout=ice_albedo_value
end where
else if(trim(ice_albedo_method) == 'ramp_function') then
albedo_inout = albedo_inout*(1.0-ice_concentration) + ice_albedo_value*ice_concentration
else
call error_mesg('mixed_layer','"'//trim(ice_albedo_method)//'"'//' is not a valid method for determining'// &
'albedo when ice is present. Choices are: step_function or ramp_function.', FATAL)
endif
if ( id_ice_conc > 0 ) used = send_data ( id_ice_conc, ice_concentration, Time )
if ( id_albedo > 0 ) used = send_data ( id_albedo, albedo_inout, Time )
endif
end subroutine albedo_calc
!=================================================================================================================================
subroutine read_ice_conc(Time)
type(time_type), intent(in) :: Time
call interpolator( ice_interp, Time, ice_concentration, trim(ice_file_name) )
if ( id_ice_conc > 0 ) used = send_data ( id_ice_conc, ice_concentration, Time )
end subroutine read_ice_conc
!=================================================================================================================================
subroutine mixed_layer_end(t_surf, bucket_depth, restart_file_bucket_depth)
real, intent(inout), dimension(:,:) :: t_surf
real, intent(inout), dimension(:,:,:) :: bucket_depth
logical, intent(in) :: restart_file_bucket_depth
integer:: unit
if(.not.module_is_initialized) return
! write a restart file for the surface temperature
call nullify_domain()
call write_data(trim('RESTART/mixed_layer.res'), 't_surf', t_surf, grid_domain)
if (restart_file_bucket_depth) then
call write_data(trim('RESTART/mixed_layer.res'), 'bucket_depth', bucket_depth, grid_domain)
endif
module_is_initialized = .false.
end subroutine mixed_layer_end
!=================================================================================================================================
end module mixed_layer_mod