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(*) Remap opacity diagnostic to tanh() #952

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Jul 20, 2019
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(*) Remap opacity diagnostic to tanh() #952

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12 changes: 10 additions & 2 deletions src/parameterizations/vertical/MOM_opacity.F90
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Original file line number Diff line number Diff line change
Expand Up @@ -82,6 +82,9 @@ module MOM_opacity
character*(10), parameter :: SINGLE_EXP_STRING = "SINGLE_EXP" !< String to specify the opacity scheme
character*(10), parameter :: DOUBLE_EXP_STRING = "DOUBLE_EXP" !< String to specify the opacity scheme

real, parameter :: op_diag_len = 1e-10 !< Lengthscale L used to remap opacity
!! from op to 1/L * tanh(op * L)

contains

!> This sets the opacity of sea water based based on one of several different schemes.
Expand Down Expand Up @@ -165,6 +168,7 @@ subroutine set_opacity(optics, sw_total, sw_vis_dir, sw_vis_dif, sw_nir_dir, sw_
endif
endif
endif

if (query_averaging_enabled(CS%diag)) then
if (CS%id_sw_pen > 0) then
!$OMP parallel do default(shared)
Expand Down Expand Up @@ -199,7 +203,10 @@ subroutine set_opacity(optics, sw_total, sw_vis_dir, sw_vis_dif, sw_nir_dir, sw_
do n=1,optics%nbands ; if (CS%id_opacity(n) > 0) then
!$OMP parallel do default(shared)
do k=1,nz ; do j=js,je ; do i=is,ie
tmp(i,j,k) = optics%opacity_band(n,i,j,k)
! Remap opacity (op) to 1/L * tanh(op * L) where L is one Angstrom.
! This gives a nearly identical value when op << 1/L but allows one to
! store the values when opacity is divergent (i.e. opaque).
tmp(i,j,k) = tanh(op_diag_len * optics%opacity_band(n,i,j,k)) / op_diag_len
enddo ; enddo ; enddo
call post_data(CS%id_opacity(n), tmp, CS%diag)
endif ; enddo
Expand Down Expand Up @@ -1093,7 +1100,8 @@ subroutine opacity_init(Time, G, GV, US, param_file, diag, CS, optics)
do n=1,optics%nbands
write(bandnum,'(i3)') n
shortname = 'opac_'//trim(adjustl(bandnum))
longname = 'Opacity for shortwave radiation in band '//trim(adjustl(bandnum))
longname = 'Opacity for shortwave radiation in band '//trim(adjustl(bandnum)) &
// ', saved as L^-1 tanh(Opacity * L) for L = 10^-10 m'
CS%id_opacity(n) = register_diag_field('ocean_model', shortname, diag%axesTL, Time, &
longname, 'm-1')
enddo
Expand Down