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Alternative interface to EQN_OF_STATE="LINEAR" #842

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Merged
merged 2 commits into from
Feb 25, 2025
Merged

Alternative interface to EQN_OF_STATE="LINEAR" #842

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Alternative interface to EQN_OF_STATE="LINEAR"
awallcraft Feb 24, 2025
5a6e7c8
corrected spelling error
awallcraft Feb 24, 2025
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20 changes: 18 additions & 2 deletions src/equation_of_state/MOM_EOS.F90
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Original file line number Diff line number Diff line change
Expand Up @@ -1472,6 +1472,9 @@ subroutine EOS_init(param_file, EOS, US)
character(len=12) :: TFREEZE_DEFAULT ! The default freezing point expression
character(len=40) :: tmpstr
logical :: EOS_quad_default
real :: Rho_Tref_Sref ! Density at Tref degC and Sref ppt [kg m-3]
real :: Tref ! Reference temperature [degC]
real :: Sref ! Reference salinity [psu]

! Read all relevant parameters and write them to the model log.
call log_version(param_file, mdl, version, "")
Expand Down Expand Up @@ -1512,10 +1515,19 @@ subroutine EOS_init(param_file, EOS, US)
trim(tmpstr)//'"', 5)

if (EOS%form_of_EOS == EOS_LINEAR) then
! RHO(T,S) = RHO_TREF_SREF + DRHO_DT*(T-TREF) + DRHO_DS*(S-SREF)
! = RHO_TREF_SREF - DRHO_DT*TREF - DRHO_DS*SREF + DRHO_DT*T + DRHO_DS*S
! = RHO_T0_S0 + DRHO_DT*T + DRHO_DS*S
EOS%Compressible = .false.
call get_param(param_file, mdl, "RHO_T0_S0", EOS%Rho_T0_S0, &
call get_param(param_file, mdl, "RHO_TREF_SREF", Rho_Tref_Sref, &
"When EQN_OF_STATE="//trim(EOS_LINEAR_STRING)//", "//&
"this is the density at T=TREF, S=SREF.", units="kg m-3", default=1000.0)
call get_param(param_file, mdl, "TREF", Tref, &
"When EQN_OF_STATE="//trim(EOS_LINEAR_STRING)//", "//&
"this is the reference temperature.", units="degC", default=0.0)
call get_param(param_file, mdl, "SREF", Sref, &
"When EQN_OF_STATE="//trim(EOS_LINEAR_STRING)//", "//&
"this is the density at T=0, S=0.", units="kg m-3", default=1000.0)
"this is the reference salinity.", units="psu", default=0.0)
call get_param(param_file, mdl, "DRHO_DT", EOS%dRho_dT, &
"When EQN_OF_STATE="//trim(EOS_LINEAR_STRING)//", "//&
"this is the partial derivative of density with "//&
Expand All @@ -1524,6 +1536,10 @@ subroutine EOS_init(param_file, EOS, US)
"When EQN_OF_STATE="//trim(EOS_LINEAR_STRING)//", "//&
"this is the partial derivative of density with salinity.", &
units="kg m-3 ppt-1", default=0.8)
call get_param(param_file, mdl, "RHO_T0_S0", EOS%Rho_T0_S0, &
"When EQN_OF_STATE="//trim(EOS_LINEAR_STRING)//", "//&
"this is the density at T=0, S=0.", units="kg m-3", &
default=Rho_Tref_Sref - EOS%dRho_dT * Tref - EOS%dRho_dS * Sref)
call EOS_manual_init(EOS, form_of_EOS=EOS_LINEAR, Rho_T0_S0=EOS%Rho_T0_S0, dRho_dT=EOS%dRho_dT, dRho_dS=EOS%dRho_dS)
endif
if (EOS%form_of_EOS == EOS_WRIGHT) then
Expand Down