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Added the full water loading term to the hydrostatic pressure computations in the physics interfaces #1450

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Added the full water loading term to the hydrostatic pressure computations in the physics interfaces #1450

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bc68e41
This commit adds the full water loading term to the hydrostatic equation
skamaroc Apr 27, 2026
5066866
This commit add changes to the water loading term in the hydrostatic
skamaroc May 7, 2026
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113 changes: 86 additions & 27 deletions src/core_atmosphere/physics/mpas_atmphys_interface.F
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Original file line number Diff line number Diff line change
Expand Up @@ -267,7 +267,7 @@ subroutine MPAS_to_physics(configs,mesh,state,time_lev,diag,diag_physics,its,ite
integer:: i,k,j

real(kind=RKIND):: z0,z1,z2,w1,w2
real(kind=RKIND):: rho_a,rho1,rho2,tem1,tem2
real(kind=RKIND):: rho_a,rho1,rho2,dz1,dz2,rdz

!-----------------------------------------------------------------------------------------------------------------
!call mpas_log_write('')
Expand Down Expand Up @@ -313,6 +313,7 @@ subroutine MPAS_to_physics(configs,mesh,state,time_lev,diag,diag_physics,its,ite
call mpas_pool_get_dimension(state,'index_qg',index_qg)

call mpas_pool_get_array(state,'scalars',scalars,time_lev)

qv => scalars(index_qv,:,:)
qc => scalars(index_qc,:,:)
qr => scalars(index_qr,:,:)
Expand All @@ -322,10 +323,13 @@ subroutine MPAS_to_physics(configs,mesh,state,time_lev,diag,diag_physics,its,ite

call mpas_pool_get_array(diag_physics,'plrad',plrad)

if( trim(microp_scheme) .ne. "mp_kessler") then

do j = jts, jte
do k = kts, kte
do i = its, ite

call mpas_log_write(" mp_wsm6 or thompson in physics interface ")
!water vapor and moist arrays:
qv_p(i,k,j) = max(0.,qv(k,i))
qc_p(i,k,j) = max(0.,qc(k,i))
Expand All @@ -334,13 +338,46 @@ subroutine MPAS_to_physics(configs,mesh,state,time_lev,diag,diag_physics,its,ite
qs_p(i,k,j) = max(0.,qs(k,i))
qg_p(i,k,j) = max(0.,qg(k,i))

enddo
enddo
enddo

else

call mpas_log_write(" mp_kessler in physics interface ")

do j = jts, jte
do k = kts, kte
do i = its, ite

!water vapor and moist arrays:
qv_p(i,k,j) = max(0.,qv(k,i))
qc_p(i,k,j) = max(0.,qc(k,i))
qr_p(i,k,j) = max(0.,qr(k,i))
qi_p(i,k,j) = 0.0
qs_p(i,k,j) = 0.0
qg_p(i,k,j) = 0.0

enddo
enddo
enddo

end if

do j = jts, jte
do k = kts, kte
do i = its, ite

!arrays located at theta points:
u_p(i,k,j) = u(k,i)
v_p(i,k,j) = v(k,i)

zz_p(i,k,j) = zz(k,i)
rho_p(i,k,j) = zz(k,i) * rho_zz(k,i)
rho_p(i,k,j) = rho_p(i,k,j)*(1._RKIND + qv_p(i,k,j))
! rho_p(i,k,j) = rho_p(i,k,j)*(1._RKIND + qv_p(i,k,j))
! Added full water loading, WCS 20260427
rho_p(i,k,j) = rho_p(i,k,j)* &
(1._RKIND + qv_p(i,k,j)+qc_p(i,k,j)+qr_p(i,k,j)+qi_p(i,k,j)+qs_p(i,k,j)+qg_p(i,k,j))
th_p(i,k,j) = theta_m(k,i) / (1._RKIND + R_v/R_d * qv_p(i,k,j))
t_p(i,k,j) = th_p(i,k,j)*exner(k,i)

Expand Down Expand Up @@ -424,18 +461,15 @@ subroutine MPAS_to_physics(configs,mesh,state,time_lev,diag,diag_physics,its,ite
case default
end select pbl_select

!calculation of the surface pressure using hydrostatic assumption down to the surface::
!calculation of the surface pressure using hydrostatic integration down to the surface::
! rho_p includes full water loading
do j = jts,jte
do i = its,ite
tem1 = zgrid(2,i)-zgrid(1,i)
tem2 = zgrid(3,i)-zgrid(2,i)
rho1 = rho_zz(1,i) * zz(1,i) * (1. + qv_p(i,1,j))
rho2 = rho_zz(2,i) * zz(2,i) * (1. + qv_p(i,2,j))
! surface_pressure(i) = 0.5*gravity*(zgrid(2,i)-zgrid(1,i)) &
! * (rho1 + 0.5*(rho2-rho1)*tem1/(tem1+tem2))
surface_pressure(i) = 0.5*gravity*(zgrid(2,i)-zgrid(1,i)) &
* (rho1 - 0.5*(rho2-rho1)*tem1/(tem1+tem2))
surface_pressure(i) = surface_pressure(i) + pressure_p(1,i) + pressure_b(1,i)
dz1 = zgrid(2,i)-zgrid(1,i)
dz2 = zgrid(3,i)-zgrid(2,i)
surface_pressure(i) = pressure_p(1,i) + pressure_b(1,i) &
+ 0.5*gravity*(zgrid(2,i)-zgrid(1,i)) &
* (rho_p(i,1,j) + 0.5*(rho_p(i,1,j)-rho_p(i,2,j))*dz1/(dz1+dz2))
enddo

do k = kts,kte
Expand All @@ -461,7 +495,7 @@ subroutine MPAS_to_physics(configs,mesh,state,time_lev,diag,diag_physics,its,ite
do i = its,ite
if(pres_p(i,1,j) .le. pres_p(i,2,j)) then
call mpas_log_write('')
call mpas_log_write('--- subroutine MPAS_to_phys - pressure(1) < pressure(2):')
call mpas_log_write('--- subroutine MPAS_to_phys - nhyd pressure(1) < nhyd pressure(2):')
call mpas_log_write('i =$i', intArgs=(/i/))
call mpas_log_write('latCell=$r', realArgs=(/latCell(i)/degrad/))
call mpas_log_write('lonCell=$r', realArgs=(/lonCell(i)/degrad/))
Expand All @@ -479,9 +513,9 @@ subroutine MPAS_to_physics(configs,mesh,state,time_lev,diag,diag_physics,its,ite
do j = jts,jte
do k = kts+1,kte
do i = its,ite
tem1 = 1./(zgrid(k+1,i)-zgrid(k-1,i))
fzm_p(i,k,j) = (zgrid(k,i)-zgrid(k-1,i)) * tem1
fzp_p(i,k,j) = (zgrid(k+1,i)-zgrid(k,i)) * tem1
rdz = 1./(zgrid(k+1,i)-zgrid(k-1,i))
fzm_p(i,k,j) = (zgrid(k,i)-zgrid(k-1,i)) * rdz
fzp_p(i,k,j) = (zgrid(k+1,i)-zgrid(k,i)) * rdz
t2_p(i,k,j) = fzm_p(i,k,j)*t_p(i,k,j) + fzp_p(i,k,j)*t_p(i,k-1,j)
pres2_p(i,k,j) = fzm_p(i,k,j)*pres_p(i,k,j) + fzp_p(i,k,j)*pres_p(i,k-1,j)
enddo
Expand Down Expand Up @@ -523,14 +557,15 @@ subroutine MPAS_to_physics(configs,mesh,state,time_lev,diag,diag_physics,its,ite
enddo

!calculation of the hydrostatic pressure:
! Added full water loading, WCS 20260427
do j = jts,jte
do i = its,ite
!pressure at w-points:
k = kte+1
pres2_hyd_p(i,k,j) = pres2_p(i,k,j)
pres2_hydd_p(i,k,j) = pres2_p(i,k,j)
do k = kte,1,-1
rho_a = rho_p(i,k,j) / (1.+qv_p(i,k,j))
rho_a = rho_p(i,k,j) / (1.+qv_p(i,k,j)+qc_p(i,k,j)+qr_p(i,k,j)+qi_p(i,k,j)+qs_p(i,k,j)+qg_p(i,k,j))
pres2_hyd_p(i,k,j) = pres2_hyd_p(i,k+1,j) + gravity*rho_p(i,k,j)*dz_p(i,k,j)
pres2_hydd_p(i,k,j) = pres2_hydd_p(i,k+1,j) + gravity*rho_a*dz_p(i,k,j)
enddo
Expand Down Expand Up @@ -864,7 +899,7 @@ subroutine microphysics_to_MPAS(configs,mesh,state,time_lev,diag,diag_physics,te
!local variables:
integer:: icount
integer:: i,k,j
real(kind=RKIND):: rho1,rho2,tem1,tem2
real(kind=RKIND):: rho1,rho2,dz1,dz2

!-----------------------------------------------------------------------------------------------------------------

Expand Down Expand Up @@ -946,23 +981,47 @@ subroutine microphysics_to_MPAS(configs,mesh,state,time_lev,diag,diag_physics,te
endif

!update surface pressure and calculates the surface pressure tendency:

if( trim(mp_scheme) .eq. "mp_kessler") then

do j = jts,jte
do i = its,ite
tem1 = zgrid(2,i)-zgrid(1,i)
tem2 = zgrid(3,i)-zgrid(2,i)
rho1 = rho_zz(1,i) * zz(1,i) * (1. + qv_p(i,1,j))
rho2 = rho_zz(2,i) * zz(2,i) * (1. + qv_p(i,2,j))
dz1 = zgrid(2,i)-zgrid(1,i)
dz2 = zgrid(3,i)-zgrid(2,i)
! rho1 = rho_zz(1,i) * zz(1,i) * (1. + qv_p(i,1,j))
! rho2 = rho_zz(2,i) * zz(2,i) * (1. + qv_p(i,2,j))
! Added full wtare loading term, WCS 20260427
rho1 = rho_zz(1,i) * zz(1,i) * (1. + qv_p(i,1,j)+qc_p(i,1,j)+qr_p(i,1,j))
rho2 = rho_zz(2,i) * zz(2,i) * (1. + qv_p(i,2,j)+qc_p(i,2,j)+qr_p(i,2,j))
tend_sfc_pressure(i) = surface_pressure(i)
surface_pressure(i) = pressure_p(1,i) + pressure_b(1,i) &
+ 0.5*gravity*(zgrid(2,i)-zgrid(1,i)) &
* (rho1 - 0.5*(rho2-rho1)*dz1/(dz1+dz2))
tend_sfc_pressure(i) = (surface_pressure(i)-tend_sfc_pressure(i)) / dt_dyn
enddo
enddo

else

do j = jts,jte
do i = its,ite
dz1 = zgrid(2,i)-zgrid(1,i)
dz2 = zgrid(3,i)-zgrid(2,i)
! rho1 = rho_zz(1,i) * zz(1,i) * (1. + qv_p(i,1,j))
! rho2 = rho_zz(2,i) * zz(2,i) * (1. + qv_p(i,2,j))
! Added full wtare loading term, WCS 20260427
rho1 = rho_zz(1,i) * zz(1,i) * (1. + qv_p(i,1,j)+qc_p(i,1,j)+qr_p(i,1,j)+qi_p(i,1,j)+qs_p(i,1,j)+qg_p(i,1,j))
rho2 = rho_zz(2,i) * zz(2,i) * (1. + qv_p(i,2,j)+qc_p(i,2,j)+qr_p(i,2,j)+qi_p(i,2,j)+qs_p(i,2,j)+qg_p(i,2,j))
tend_sfc_pressure(i) = surface_pressure(i)
! surface_pressure(i) = 0.5*gravity*(zgrid(2,i)-zgrid(1,i)) &
! * (rho1 + 0.5*(rho2-rho1)*tem1/(tem1+tem2))
surface_pressure(i) = 0.5*gravity*(zgrid(2,i)-zgrid(1,i)) &
* (rho1 - 0.5*(rho2-rho1)*tem1/(tem1+tem2))
surface_pressure(i) = surface_pressure(i) + pressure_p(1,i) + pressure_b(1,i)
surface_pressure(i) = pressure_p(1,i) + pressure_b(1,i) &
+ 0.5*gravity*(zgrid(2,i)-zgrid(1,i)) &
* (rho1 - 0.5*(rho2-rho1)*dz1/(dz1+dz2))
tend_sfc_pressure(i) = (surface_pressure(i)-tend_sfc_pressure(i)) / dt_dyn
enddo
enddo

end if

!update cloud water species and aerosols as functions of cloud microphysics schemes:
mp_select: select case(trim(mp_scheme))
case("mp_thompson","mp_thompson_aerosols","mp_wsm6")
Expand Down