model/inc/PARAMS.h

C $Header: /u/gcmpack/MITgcm/model/inc/PARAMS.h,v 1.286 2017/04/04 23:19:33 jmc Exp $
C $Name:  $
C

CBOP
C     !ROUTINE: PARAMS.h
C     !INTERFACE:
C     #include PARAMS.h

C     !DESCRIPTION:
C     Header file defining model "parameters".  The values from the
C     model standard input file are stored into the variables held
C     here. Notes describing the parameters can also be found here.

CEOP

C--   Contants
C     Useful physical values
      Real*8 PI
      PARAMETER ( PI    = 3.14159265358979323844D0   )
      Real*8 deg2rad
      PARAMETER ( deg2rad = 2.D0*PI/360.D0           )

C--   COMMON /PARM_C/ Character valued parameters used by the model.
C     buoyancyRelation :: Flag used to indicate which relation to use to
C                         get buoyancy.
C     eosType         :: choose the equation of state:
C                        LINEAR, POLY3, UNESCO, JMD95Z, JMD95P, MDJWF, IDEALGAS
C     pickupSuff      :: force to start from pickup files (even if nIter0=0)
C                        and read pickup files with this suffix (max 10 Char.)
C     mdsioLocalDir   :: read-write tiled file from/to this directory name
C                        (+ 4 digits Processor-Rank) instead of current dir.
C     adTapeDir       :: read-write checkpointing tape files from/to this
C                        directory name instead of current dir. Conflicts
C                        mdsioLocalDir, so only one of the two can be set.
C     tRefFile      :: File containing reference Potential Temperat.  tRef (1.D)
C     sRefFile      :: File containing reference salinity/spec.humid. sRef (1.D)
C     rhoRefFile    :: File containing reference density profile rhoRef (1.D)
C     gravityFile   :: File containing gravity vertical profile (1.D)
C     delRFile      :: File containing vertical grid spacing delR  (1.D array)
C     delRcFile     :: File containing vertical grid spacing delRc (1.D array)
C     hybSigmFile   :: File containing hybrid-sigma vertical coord. coeff. (2x 1.D)
C     delXFile      :: File containing X-spacing grid definition (1.D array)
C     delYFile      :: File containing Y-spacing grid definition (1.D array)
C     horizGridFile :: File containing horizontal-grid definition
C                        (only when using curvilinear_grid)
C     bathyFile       :: File containing bathymetry. If not defined bathymetry
C                        is taken from inline function.
C     topoFile        :: File containing the topography of the surface (unit=m)
C                        (mainly used for the atmosphere = ground height).
C     addWwallFile    :: File containing 2-D additional Western  cell-edge wall
C     addSwallFile    :: File containing 2-D additional Southern cell-edge wall
C                        (e.g., to add "thin-wall" where it is =1)
C     hydrogThetaFile :: File containing initial hydrographic data (3-D)
C                        for potential temperature.
C     hydrogSaltFile  :: File containing initial hydrographic data (3-D)
C                        for salinity.
C     diffKrFile      :: File containing 3D specification of vertical diffusivity
C     viscAhDfile     :: File containing 3D specification of horizontal viscosity
C     viscAhZfile     :: File containing 3D specification of horizontal viscosity
C     viscA4Dfile     :: File containing 3D specification of horizontal viscosity
C     viscA4Zfile     :: File containing 3D specification of horizontal viscosity
C     zonalWindFile   :: File containing zonal wind data
C     meridWindFile   :: File containing meridional wind data
C     thetaClimFile   :: File containing surface theta climataology used
C                        in relaxation term -lambda(theta-theta*)
C     saltClimFile    :: File containing surface salt climataology used
C                        in relaxation term -lambda(salt-salt*)
C     surfQfile       :: File containing surface heat flux, excluding SW
C                        (old version, kept for backward compatibility)
C     surfQnetFile    :: File containing surface net heat flux
C     surfQswFile     :: File containing surface shortwave radiation
C     EmPmRfile       :: File containing surface fresh water flux
C           NOTE: for backward compatibility EmPmRfile is specified in
C                 m/s when using external_fields_load.F.  It is converted
C                 to kg/m2/s by multiplying by rhoConstFresh.
C     saltFluxFile    :: File containing surface salt flux
C     pLoadFile       :: File containing pressure loading
C     addMassFile     :: File containing source/sink of fluid in the interior
C     eddyPsiXFile    :: File containing zonal Eddy streamfunction data
C     eddyPsiYFile    :: File containing meridional Eddy streamfunction data
C     the_run_name    :: string identifying the name of the model "run"
      COMMON /PARM_C/
     &                buoyancyRelation, eosType,
     &                pickupSuff, mdsioLocalDir, adTapeDir,
     &                tRefFile, sRefFile, rhoRefFile, gravityFile,
     &                delRFile, delRcFile, hybSigmFile,
     &                delXFile, delYFile, horizGridFile,
     &                bathyFile, topoFile, addWwallFile, addSwallFile,
     &                viscAhDfile, viscAhZfile,
     &                viscA4Dfile, viscA4Zfile,
     &                hydrogThetaFile, hydrogSaltFile, diffKrFile,
     &                zonalWindFile, meridWindFile, thetaClimFile,
     &                saltClimFile,
     &                EmPmRfile, saltFluxFile,
     &                surfQfile, surfQnetFile, surfQswFile,
     &                lambdaThetaFile, lambdaSaltFile,
     &                uVelInitFile, vVelInitFile, pSurfInitFile,
     &                pLoadFile, addMassFile,
     &                eddyPsiXFile, eddyPsiYFile, geothermalFile,
     &                the_run_name
      CHARACTER*(MAX_LEN_FNAM) buoyancyRelation
      CHARACTER*(6)  eosType
      CHARACTER*(10) pickupSuff
      CHARACTER*(MAX_LEN_FNAM) mdsioLocalDir
      CHARACTER*(MAX_LEN_FNAM) adTapeDir
      CHARACTER*(MAX_LEN_FNAM) tRefFile
      CHARACTER*(MAX_LEN_FNAM) sRefFile
      CHARACTER*(MAX_LEN_FNAM) rhoRefFile
      CHARACTER*(MAX_LEN_FNAM) gravityFile
      CHARACTER*(MAX_LEN_FNAM) delRFile
      CHARACTER*(MAX_LEN_FNAM) delRcFile
      CHARACTER*(MAX_LEN_FNAM) hybSigmFile
      CHARACTER*(MAX_LEN_FNAM) delXFile
      CHARACTER*(MAX_LEN_FNAM) delYFile
      CHARACTER*(MAX_LEN_FNAM) horizGridFile
      CHARACTER*(MAX_LEN_FNAM) bathyFile, topoFile
      CHARACTER*(MAX_LEN_FNAM) addWwallFile, addSwallFile
      CHARACTER*(MAX_LEN_FNAM) hydrogThetaFile, hydrogSaltFile
      CHARACTER*(MAX_LEN_FNAM) diffKrFile
      CHARACTER*(MAX_LEN_FNAM) viscAhDfile
      CHARACTER*(MAX_LEN_FNAM) viscAhZfile
      CHARACTER*(MAX_LEN_FNAM) viscA4Dfile
      CHARACTER*(MAX_LEN_FNAM) viscA4Zfile
      CHARACTER*(MAX_LEN_FNAM) zonalWindFile
      CHARACTER*(MAX_LEN_FNAM) meridWindFile
      CHARACTER*(MAX_LEN_FNAM) thetaClimFile
      CHARACTER*(MAX_LEN_FNAM) saltClimFile
      CHARACTER*(MAX_LEN_FNAM) surfQfile
      CHARACTER*(MAX_LEN_FNAM) surfQnetFile
      CHARACTER*(MAX_LEN_FNAM) surfQswFile
      CHARACTER*(MAX_LEN_FNAM) EmPmRfile
      CHARACTER*(MAX_LEN_FNAM) saltFluxFile
      CHARACTER*(MAX_LEN_FNAM) uVelInitFile
      CHARACTER*(MAX_LEN_FNAM) vVelInitFile
      CHARACTER*(MAX_LEN_FNAM) pSurfInitFile
      CHARACTER*(MAX_LEN_FNAM) pLoadFile
      CHARACTER*(MAX_LEN_FNAM) addMassFile
      CHARACTER*(MAX_LEN_FNAM) eddyPsiXFile
      CHARACTER*(MAX_LEN_FNAM) eddyPsiYFile
      CHARACTER*(MAX_LEN_FNAM) geothermalFile
      CHARACTER*(MAX_LEN_FNAM) lambdaThetaFile
      CHARACTER*(MAX_LEN_FNAM) lambdaSaltFile
      CHARACTER*(MAX_LEN_PREC/2) the_run_name

C--   COMMON /PARM_I/ Integer valued parameters used by the model.
C     cg2dMaxIters        :: Maximum number of iterations in the
C                            two-dimensional con. grad solver.
C     cg2dChkResFreq      :: Frequency with which to check residual
C                            in con. grad solver.
C     cg2dPreCondFreq     :: Frequency for updating cg2d preconditioner
C                            (non-linear free-surf.)
C     cg2dUseMinResSol    :: =0 : use last-iteration/converged solution
C                            =1 : use solver minimum-residual solution
C     cg3dMaxIters        :: Maximum number of iterations in the
C                            three-dimensional con. grad solver.
C     cg3dChkResFreq      :: Frequency with which to check residual
C                            in con. grad solver.
C     printResidualFreq   :: Frequency for printing residual in CG iterations
C     nIter0              :: Start time-step number of for this run
C     nTimeSteps          :: Number of timesteps to execute
C     nTimeSteps_l2       :: Number of inner timesteps to execute per timestep
C     selectCoriMap       :: select setting of Coriolis parameter map:
C                           =0 f-Plane (Constant Coriolis, = f0)
C                           =1 Beta-Plane Coriolis (= f0 + beta.y)
C                           =2 Spherical Coriolis (= 2.omega.sin(phi))
C                           =3 Read Coriolis 2-d fields from files.
C     selectSigmaCoord    :: option related to sigma vertical coordinate
C     nonlinFreeSurf      :: option related to non-linear free surface
C                           =0 Linear free surface ; >0 Non-linear
C     select_rStar        :: option related to r* vertical coordinate
C                           =0 (default) use r coord. ; > 0 use r*
C     selectNHfreeSurf    :: option for Non-Hydrostatic (free-)Surface formulation:
C                           =0 (default) hydrostatic surf. ; > 0 add NH effects.
C     selectP_inEOS_Zc    :: select which pressure to use in EOS (for z-coords)
C                           =0: simply: -g*rhoConst*z
C                           =1: use pRef = integral{-g*rho(Tref,Sref,pRef)*dz}
C                           =2: use hydrostatic dynamical pressure
C                           =3: use full (Hyd+NH) dynamical pressure
C     selectAddFluid      :: option to add mass source/sink of fluid in the interior
C                            (3-D generalisation of oceanic real-fresh water flux)
C                           =0 off ; =1 add fluid ; =-1 virtual flux (no mass added)
C     selectImplicitDrag  :: select Implicit treatment of bottom/top drag
C                           = 0: fully explicit
C                           = 1: implicit on provisional velocity
C                                (i.e., before grad.Eta increment)
C                           = 2: fully implicit (combined with Impl Surf.Press)
C     momForcingOutAB     :: =1: take momentum forcing contribution
C                            out of (=0: in) Adams-Bashforth time stepping.
C     tracForcingOutAB    :: =1: take tracer (Temp,Salt,pTracers) forcing contribution
C                            out of (=0: in) Adams-Bashforth time stepping.
C     tempAdvScheme       :: Temp. Horiz.Advection scheme selector
C     tempVertAdvScheme   :: Temp. Vert. Advection scheme selector
C     saltAdvScheme       :: Salt. Horiz.advection scheme selector
C     saltVertAdvScheme   :: Salt. Vert. Advection scheme selector
C     selectKEscheme      :: Kinetic Energy scheme selector (Vector Inv.)
C     selectVortScheme    :: Scheme selector for Vorticity term (Vector Inv.)
C     selectBotDragQuadr  :: quadratic bottom drag discretisation option:
C                           =0: average KE from grid center to U & V location
C                           =1: use local velocity norm @ U & V location
C                           =2: same with wet-point averaging of other component
C     readBinaryPrec      :: Precision used for reading binary files
C     writeStatePrec      :: Precision used for writing model state.
C     writeBinaryPrec     :: Precision used for writing binary files
C     rwSuffixType        :: controls the format of the mds file suffix.
C                          =0 (default): use iteration number (myIter, I10.10);
C                          =1: 100*myTime (100th sec); =2: myTime (seconds);
C                          =3: myTime/360 (10th of hr); =4: myTime/3600 (hours).
C     monitorSelect       :: select group of variables to monitor
C                            =1 : dynvars ; =2 : + vort ; =3 : + surface
C-    debugLevel          :: controls printing of algorithm intermediate results
C                            and statistics ; higher -> more writing
C-    plotLevel           :: controls printing of field maps ; higher -> more flds

      COMMON /PARM_I/
     &        cg2dMaxIters, cg2dChkResFreq,
     &        cg2dPreCondFreq, cg2dUseMinResSol,
     &        cg3dMaxIters, cg3dChkResFreq,
     &        printResidualFreq,
     &        nIter0, nTimeSteps, nTimeSteps_l2, nEndIter,
     &        selectCoriMap,
     &        selectSigmaCoord,
     &        nonlinFreeSurf, select_rStar,
     &        selectNHfreeSurf, selectP_inEOS_Zc,
     &        selectAddFluid, selectImplicitDrag,
     &        momForcingOutAB, tracForcingOutAB,
     &        tempAdvScheme, tempVertAdvScheme,
     &        saltAdvScheme, saltVertAdvScheme,
     &        selectKEscheme, selectVortScheme,
     &        selectBotDragQuadr,
     &        readBinaryPrec, writeBinaryPrec, writeStatePrec,
     &        rwSuffixType, monitorSelect, debugLevel, plotLevel
      INTEGER cg2dMaxIters
      INTEGER cg2dChkResFreq
      INTEGER cg2dPreCondFreq
      INTEGER cg2dUseMinResSol
      INTEGER cg3dMaxIters
      INTEGER cg3dChkResFreq
      INTEGER printResidualFreq
      INTEGER nIter0
      INTEGER nTimeSteps
      INTEGER nTimeSteps_l2
      INTEGER nEndIter
      INTEGER selectCoriMap
      INTEGER selectSigmaCoord
      INTEGER nonlinFreeSurf
      INTEGER select_rStar
      INTEGER selectNHfreeSurf
      INTEGER selectP_inEOS_Zc
      INTEGER selectAddFluid
      INTEGER selectImplicitDrag
      INTEGER momForcingOutAB, tracForcingOutAB
      INTEGER tempAdvScheme, tempVertAdvScheme
      INTEGER saltAdvScheme, saltVertAdvScheme
      INTEGER selectKEscheme
      INTEGER selectVortScheme
      INTEGER selectBotDragQuadr
      INTEGER readBinaryPrec
      INTEGER writeStatePrec
      INTEGER writeBinaryPrec
      INTEGER rwSuffixType
      INTEGER monitorSelect
      INTEGER debugLevel
      INTEGER plotLevel

C--   COMMON /PARM_L/ Logical valued parameters used by the model.
C- Coordinate + Grid params:
C     fluidIsAir       :: Set to indicate that the fluid major constituent
C                         is air
C     fluidIsWater     :: Set to indicate that the fluid major constituent
C                         is water
C     usingPCoords     :: Set to indicate that we are working in a pressure
C                         type coordinate (p or p*).
C     usingZCoords     :: Set to indicate that we are working in a height
C                         type coordinate (z or z*)
C     usingCartesianGrid :: If TRUE grid generation will be in a cartesian
C                           coordinate frame.
C     usingSphericalPolarGrid :: If TRUE grid generation will be in a
C                                spherical polar frame.
C     rotateGrid      :: rotate grid coordinates to geographical coordinates
C                        according to Euler angles phiEuler, thetaEuler, psiEuler
C     usingCylindricalGrid :: If TRUE grid generation will be Cylindrical
C     usingCurvilinearGrid :: If TRUE, use a curvilinear grid (to be provided)
C     hasWetCSCorners :: domain contains CS-type corners where dynamics is solved
C     deepAtmosphere :: deep model (drop the shallow-atmosphere approximation)
C     setInterFDr    :: set Interface depth (put cell-Center at the middle)
C     setCenterDr    :: set cell-Center depth (put Interface at the middle)
C     useMin4hFacEdges :: set hFacW,hFacS as minimum of adjacent hFacC factor
C- Momentum params:
C     no_slip_sides  :: Impose "no-slip" at lateral boundaries.
C     no_slip_bottom :: Impose "no-slip" at bottom boundary.
C     bottomVisc_pCell :: account for partial-cell in bottom visc. (no-slip BC)
C     useSmag3D      :: Use isotropic 3-D Smagorinsky
C     useFullLeith   :: Set to true to use full Leith viscosity(may be unstable
C                       on irregular grids)
C     useStrainTensionVisc:: Set to true to use Strain-Tension viscous terms
C     useAreaViscLength :: Set to true to use old scaling for viscous lengths,
C                          e.g., L2=Raz.  May be preferable for cube sphere.
C     momViscosity  :: Flag which turns momentum friction terms on and off.
C     momAdvection  :: Flag which turns advection of momentum on and off.
C     momForcing    :: Flag which turns external forcing of momentum on
C                      and off.
C     momPressureForcing :: Flag which turns pressure term in momentum equation
C                          on and off.
C     metricTerms   :: Flag which turns metric terms on or off.
C     useNHMTerms   :: If TRUE use non-hydrostatic metric terms.
C     useCoriolis   :: Flag which turns the coriolis terms on and off.
C     use3dCoriolis :: Turns the 3-D coriolis terms (in Omega.cos Phi) on - off
C     useCDscheme   :: use CD-scheme to calculate Coriolis terms.
C     vectorInvariantMomentum :: use Vector-Invariant form (mom_vecinv package)
C                                (default = F = use mom_fluxform package)
C     useJamartWetPoints :: Use wet-point method for Coriolis (Jamart & Ozer 1986)
C     useJamartMomAdv :: Use wet-point method for V.I. non-linear term
C     upwindVorticity :: bias interpolation of vorticity in the Coriolis term
C     highOrderVorticity :: use 3rd/4th order interp. of vorticity (V.I., advection)
C     useAbsVorticity :: work with f+zeta in Coriolis terms
C     upwindShear     :: use 1rst order upwind interp. (V.I., vertical advection)
C     momStepping    :: Turns momentum equation time-stepping off
C     calc_wVelocity :: Turns vertical velocity calculation off
C- Temp. & Salt params:
C     tempStepping   :: Turns temperature equation time-stepping on/off
C     saltStepping   :: Turns salinity equation time-stepping on/off
C     addFrictionHeating :: account for frictional heating
C     tempAdvection  :: Flag which turns advection of temperature on and off.
C     tempVertDiff4  :: use vertical bi-harmonic diffusion for temperature
C     tempIsActiveTr :: Pot.Temp. is a dynamically active tracer
C     tempForcing    :: Flag which turns external forcing of temperature on/off
C     saltAdvection  :: Flag which turns advection of salinity on and off.
C     saltVertDiff4  :: use vertical bi-harmonic diffusion for salinity
C     saltIsActiveTr :: Salinity  is a dynamically active tracer
C     saltForcing    :: Flag which turns external forcing of salinity on/off
C     maskIniTemp    :: apply mask to initial Pot.Temp.
C     maskIniSalt    :: apply mask to initial salinity
C     checkIniTemp   :: check for points with identically zero initial Pot.Temp.
C     checkIniSalt   :: check for points with identically zero initial salinity
C- Pressure solver related parameters (PARM02)
C     useSRCGSolver  :: Set to true to use conjugate gradient
C                       solver with single reduction (only one call of
C                       s/r mpi_allreduce), default is false
C- Time-stepping & free-surface params:
C     rigidLid            :: Set to true to use rigid lid
C     implicitFreeSurface :: Set to true to use implicit free surface
C     uniformLin_PhiSurf  :: Set to true to use a uniform Bo_surf in the
C                            linear relation Phi_surf = Bo_surf*eta
C     uniformFreeSurfLev  :: TRUE if free-surface level-index is uniform (=1)
C     exactConserv        :: Set to true to conserve exactly the total Volume
C     linFSConserveTr     :: Set to true to correct source/sink of tracer
C                            at the surface due to Linear Free Surface
C     useRealFreshWaterFlux :: if True (=Natural BCS), treats P+R-E flux
C                         as a real Fresh Water (=> changes the Sea Level)
C                         if F, converts P+R-E to salt flux (no SL effect)
C     storePhiHyd4Phys :: store hydrostatic potential for use in Physics/EOS
C                         this requires specific code for restart & exchange
C     quasiHydrostatic :: Using non-hydrostatic terms in hydrostatic algorithm
C     nonHydrostatic   :: Using non-hydrostatic algorithm
C     use3Dsolver      :: set to true to use 3-D pressure solver
C     implicitIntGravWave :: treat Internal Gravity Wave implicitly
C     staggerTimeStep   :: enable a Stagger time stepping U,V (& W) then T,S
C     applyExchUV_early :: Apply EXCH to U,V earlier, just before integr_continuity
C     doResetHFactors   :: Do reset thickness factors @ beginning of each time-step
C     implicitDiffusion :: Turns implicit vertical diffusion on
C     implicitViscosity :: Turns implicit vertical viscosity on
C     tempImplVertAdv   :: Turns on implicit vertical advection for Temperature
C     saltImplVertAdv   :: Turns on implicit vertical advection for Salinity
C     momImplVertAdv    :: Turns on implicit vertical advection for Momentum
C     multiDimAdvection :: Flag that enable multi-dimension advection
C     useMultiDimAdvec  :: True if multi-dim advection is used at least once
C     momDissip_In_AB   :: if False, put Dissipation tendency contribution
C                          out off Adams-Bashforth time stepping.
C     doAB_onGtGs       :: if the Adams-Bashforth time stepping is used, always
C                          apply AB on tracer tendencies (rather than on Tracer)
C- Other forcing params -
C     balanceEmPmR    :: substract global mean of EmPmR at every time step
C     balanceQnet     :: substract global mean of Qnet at every time step
C     balancePrintMean:: print substracted global means to STDOUT
C     doThetaClimRelax :: Set true if relaxation to temperature
C                        climatology is required.
C     doSaltClimRelax  :: Set true if relaxation to salinity
C                        climatology is required.
C     balanceThetaClimRelax :: substract global mean effect at every time step
C     balanceSaltClimRelax :: substract global mean effect at every time step
C     allowFreezing  :: Allows surface water to freeze and form ice
C     periodicExternalForcing :: Set true if forcing is time-dependant
C- I/O parameters -
C     globalFiles    :: Selects between "global" and "tiled" files.
C                       On some platforms with MPI, option globalFiles is either
C                       slow or does not work. Use useSingleCpuIO instead.
C     useSingleCpuIO :: moved to EEPARAMS.h
C     pickupStrictlyMatch :: check and stop if pickup-file do not stricly match
C     startFromPickupAB2 :: with AB-3 code, start from an AB-2 pickup
C     usePickupBeforeC54 :: start from old-pickup files, generated with code from
C                           before checkpoint-54a, Jul 06, 2004.
C     pickup_write_mdsio :: use mdsio to write pickups
C     pickup_read_mdsio  :: use mdsio to read  pickups
C     pickup_write_immed :: echo the pickup immediately (for conversion)
C     writePickupAtEnd   :: write pickup at the last timestep
C     timeave_mdsio      :: use mdsio for timeave output
C     snapshot_mdsio     :: use mdsio for "snapshot" (dumpfreq/diagfreq) output
C     monitor_stdio      :: use stdio for monitor output
C     dumpInitAndLast :: dumps model state to files at Initial (nIter0)
C                        & Last iteration, in addition multiple of dumpFreq iter.

      COMMON /PARM_L/
     & fluidIsAir, fluidIsWater,
     & usingPCoords, usingZCoords,
     & usingCartesianGrid, usingSphericalPolarGrid, rotateGrid,
     & usingCylindricalGrid, usingCurvilinearGrid, hasWetCSCorners,
     & deepAtmosphere, setInterFDr, setCenterDr, useMin4hFacEdges,
     & no_slip_sides, no_slip_bottom, bottomVisc_pCell, useSmag3D,
     & useFullLeith, useStrainTensionVisc, useAreaViscLength,
     & momViscosity, momAdvection, momForcing,
     & momPressureForcing, metricTerms, useNHMTerms,
     & useCoriolis, use3dCoriolis,
     & useCDscheme, vectorInvariantMomentum,
     & useEnergyConservingCoriolis, useJamartWetPoints, useJamartMomAdv,
     & upwindVorticity, highOrderVorticity,
     & useAbsVorticity, upwindShear,
     & momStepping, calc_wVelocity, tempStepping, saltStepping,
     & addFrictionHeating,
     & tempAdvection, tempVertDiff4, tempIsActiveTr, tempForcing,
     & saltAdvection, saltVertDiff4, saltIsActiveTr, saltForcing,
     & maskIniTemp, maskIniSalt, checkIniTemp, checkIniSalt,
     & useSRCGSolver,
     & rigidLid, implicitFreeSurface,
     & uniformLin_PhiSurf, uniformFreeSurfLev,
     & exactConserv, linFSConserveTr, useRealFreshWaterFlux,
     & storePhiHyd4Phys, quasiHydrostatic, nonHydrostatic,
     & use3Dsolver, implicitIntGravWave, staggerTimeStep,
     & applyExchUV_early, doResetHFactors,
     & implicitDiffusion, implicitViscosity,
     & tempImplVertAdv, saltImplVertAdv, momImplVertAdv,
     & multiDimAdvection, useMultiDimAdvec,
     & momDissip_In_AB, doAB_onGtGs,
     & balanceEmPmR, balanceQnet, balancePrintMean,
     & balanceThetaClimRelax, balanceSaltClimRelax,
     & doThetaClimRelax, doSaltClimRelax,
     & allowFreezing,
     & periodicExternalForcing,
     & globalFiles,
     & pickupStrictlyMatch, usePickupBeforeC54, startFromPickupAB2,
     & pickup_read_mdsio, pickup_write_mdsio, pickup_write_immed,
     & writePickupAtEnd,
     & timeave_mdsio, snapshot_mdsio, monitor_stdio,
     & outputTypesInclusive, dumpInitAndLast

      LOGICAL fluidIsAir
      LOGICAL fluidIsWater
      LOGICAL usingPCoords
      LOGICAL usingZCoords
      LOGICAL usingCartesianGrid
      LOGICAL usingSphericalPolarGrid, rotateGrid
      LOGICAL usingCylindricalGrid
      LOGICAL usingCurvilinearGrid, hasWetCSCorners
      LOGICAL deepAtmosphere
      LOGICAL setInterFDr
      LOGICAL setCenterDr
      LOGICAL useMin4hFacEdges

      LOGICAL no_slip_sides
      LOGICAL no_slip_bottom
      LOGICAL bottomVisc_pCell
      LOGICAL useSmag3D
      LOGICAL useFullLeith
      LOGICAL useStrainTensionVisc
      LOGICAL useAreaViscLength
      LOGICAL momViscosity
      LOGICAL momAdvection
      LOGICAL momForcing
      LOGICAL momPressureForcing
      LOGICAL metricTerms
      LOGICAL useNHMTerms

      LOGICAL useCoriolis
      LOGICAL use3dCoriolis
      LOGICAL useCDscheme
      LOGICAL vectorInvariantMomentum
      LOGICAL useEnergyConservingCoriolis
      LOGICAL useJamartWetPoints
      LOGICAL useJamartMomAdv
      LOGICAL upwindVorticity
      LOGICAL highOrderVorticity
      LOGICAL useAbsVorticity
      LOGICAL upwindShear
      LOGICAL momStepping
      LOGICAL calc_wVelocity
      LOGICAL tempStepping
      LOGICAL saltStepping
      LOGICAL addFrictionHeating
      LOGICAL tempAdvection
      LOGICAL tempVertDiff4
      LOGICAL tempIsActiveTr
      LOGICAL tempForcing
      LOGICAL saltAdvection
      LOGICAL saltVertDiff4
      LOGICAL saltIsActiveTr
      LOGICAL saltForcing
      LOGICAL maskIniTemp
      LOGICAL maskIniSalt
      LOGICAL checkIniTemp
      LOGICAL checkIniSalt
      LOGICAL useSRCGSolver
      LOGICAL rigidLid
      LOGICAL implicitFreeSurface
      LOGICAL uniformLin_PhiSurf
      LOGICAL uniformFreeSurfLev
      LOGICAL exactConserv
      LOGICAL linFSConserveTr
      LOGICAL useRealFreshWaterFlux
      LOGICAL storePhiHyd4Phys
      LOGICAL quasiHydrostatic
      LOGICAL nonHydrostatic
      LOGICAL use3Dsolver
      LOGICAL implicitIntGravWave
      LOGICAL staggerTimeStep
      LOGICAL applyExchUV_early
      LOGICAL doResetHFactors
      LOGICAL implicitDiffusion
      LOGICAL implicitViscosity
      LOGICAL tempImplVertAdv
      LOGICAL saltImplVertAdv
      LOGICAL momImplVertAdv
      LOGICAL multiDimAdvection
      LOGICAL useMultiDimAdvec
      LOGICAL momDissip_In_AB
      LOGICAL doAB_onGtGs
      LOGICAL balanceEmPmR
      LOGICAL balanceQnet
      LOGICAL balancePrintMean
      LOGICAL doThetaClimRelax
      LOGICAL doSaltClimRelax
      LOGICAL balanceThetaClimRelax
      LOGICAL balanceSaltClimRelax
      LOGICAL allowFreezing
      LOGICAL periodicExternalForcing
      LOGICAL globalFiles
      LOGICAL pickupStrictlyMatch
      LOGICAL usePickupBeforeC54
      LOGICAL startFromPickupAB2
      LOGICAL pickup_read_mdsio, pickup_write_mdsio
      LOGICAL pickup_write_immed, writePickupAtEnd
      LOGICAL timeave_mdsio, snapshot_mdsio, monitor_stdio
      LOGICAL outputTypesInclusive
      LOGICAL dumpInitAndLast

C--   COMMON /PARM_R/ "Real" valued parameters used by the model.
C     cg2dTargetResidual
C          :: Target residual for cg2d solver; no unit (RHS normalisation)
C     cg2dTargetResWunit
C          :: Target residual for cg2d solver; W unit (No RHS normalisation)
C     cg3dTargetResidual
C               :: Target residual for cg3d solver.
C     cg2dpcOffDFac :: Averaging weight for preconditioner off-diagonal.
C     Note. 20th May 1998
C           I made a weird discovery! In the model paper we argue
C           for the form of the preconditioner used here ( see
C           A Finite-volume, Incompressible Navier-Stokes Model
C           ...., Marshall et. al ). The algebra gives a simple
C           0.5 factor for the averaging of ac and aCw to get a
C           symmettric pre-conditioner. By using a factor of 0.51
C           i.e. scaling the off-diagonal terms in the
C           preconditioner down slightly I managed to get the
C           number of iterations for convergence in a test case to
C           drop form 192 -> 134! Need to investigate this further!
C           For now I have introduced a parameter cg2dpcOffDFac which
C           defaults to 0.51 but can be set at runtime.
C     delR      :: Vertical grid spacing ( units of r ).
C     delRc     :: Vertical grid spacing between cell centers (r unit).
C     delX      :: Separation between cell faces (m) or (deg), depending
C     delY         on input flags. Note: moved to header file SET_GRID.h
C     xgOrigin   :: Origin of the X-axis (Cartesian Grid) / Longitude of Western
C                :: most cell face (Lat-Lon grid) (Note: this is an "inert"
C                :: parameter but it makes geographical references simple.)
C     ygOrigin   :: Origin of the Y-axis (Cartesian Grid) / Latitude of Southern
C                :: most face (Lat-Lon grid).
C     rSphere    :: Radius of sphere for a spherical polar grid ( m ).
C     recip_rSphere :: Reciprocal radius of sphere ( m^-1 ).
C     radius_fromHorizGrid :: sphere Radius of input horiz. grid (Curvilinear Grid)
C     seaLev_Z   :: the reference height of sea-level (usually zero)
C     top_Pres   :: pressure (P-Coords) or reference pressure (Z-Coords) at the top
C     rSigmaBnd  :: vertical position (in r-unit) of r/sigma transition (Hybrid-Sigma)
C     gravity    :: Acceleration due to constant gravity ( m/s^2 )
C     recip_gravity :: Reciprocal gravity acceleration ( s^2/m )
C     gBaro      :: Accel. due to gravity used in barotropic equation ( m/s^2 )
C     gravFacC   :: gravity factor (vs surf. gravity) vert. profile at cell-Center
C     gravFacF   :: gravity factor (vs surf. gravity) vert. profile at cell-interF
C     rhoNil     :: Reference density for the linear equation of state
C     rhoConst   :: Vertically constant reference density (Boussinesq)
C     rho1Ref    :: reference vertical profile for density (anelastic)
C     rhoFacC    :: normalized (by rhoConst) reference density at cell-Center
C     rhoFacF    :: normalized (by rhoConst) reference density at cell-interFace
C     rhoConstFresh :: Constant reference density for fresh water (rain)
C     thetaConst :: Constant reference for potential temperature
C     tRef       :: reference vertical profile for potential temperature
C     sRef       :: reference vertical profile for salinity/specific humidity
C     pRef4EOS   :: reference pressure used in EOS (case selectP_inEOS_Zc=1)
C     phiRef     :: reference potential (press/rho, geopot) profile (m^2/s^2)
C     dBdrRef    :: vertical gradient of reference buoyancy  [(m/s/r)^2]:
C                :: z-coord: = N^2_ref = Brunt-Vaissala frequency [s^-2]
C                :: p-coord: = -(d.alpha/dp)_ref          [(m^2.s/kg)^2]
C     rVel2wUnit :: units conversion factor (Non-Hydrostatic code),
C                :: from r-coordinate vertical velocity to vertical velocity [m/s].
C                :: z-coord: = 1 ; p-coord: wSpeed [m/s] = rVel [Pa/s] * rVel2wUnit
C     wUnit2rVel :: units conversion factor (Non-Hydrostatic code),
C                :: from vertical velocity [m/s] to r-coordinate vertical velocity.
C                :: z-coord: = 1 ; p-coord: rVel [Pa/s] = wSpeed [m/s] * wUnit2rVel
C     mass2rUnit :: units conversion factor (surface forcing),
C                :: from mass per unit area [kg/m2] to vertical r-coordinate unit.
C                :: z-coord: = 1/rhoConst ( [kg/m2] / rho = [m] ) ;
C                :: p-coord: = gravity    ( [kg/m2] *  g = [Pa] ) ;
C     rUnit2mass :: units conversion factor (surface forcing),
C                :: from vertical r-coordinate unit to mass per unit area [kg/m2].
C                :: z-coord: = rhoConst  ( [m] * rho = [kg/m2] ) ;
C                :: p-coord: = 1/gravity ( [Pa] /  g = [kg/m2] ) ;
C     f0         :: Reference coriolis parameter ( 1/s )
C                   ( Southern edge f for beta plane )
C     beta       :: df/dy ( s^-1.m^-1 )
C     fPrime     :: Second Coriolis parameter ( 1/s ), related to Y-component
C                   of rotation (reference value = 2.Omega.Cos(Phi))
C     omega      :: Angular velocity ( rad/s )
C     rotationPeriod :: Rotation period (s) (= 2.pi/omega)
C     viscArNr   :: vertical profile of Eddy viscosity coeff.
C                   for vertical mixing of momentum ( units of r^2/s )
C     viscAh     :: Eddy viscosity coeff. for mixing of
C                   momentum laterally ( m^2/s )
C     viscAhW    :: Eddy viscosity coeff. for mixing of vertical
C                   momentum laterally, no effect for hydrostatic
C                   model, defaults to viscAhD if unset ( m^2/s )
C                   Not used if variable horiz. viscosity is used.
C     viscA4     :: Biharmonic viscosity coeff. for mixing of
C                   momentum laterally ( m^4/s )
C     viscA4W    :: Biharmonic viscosity coeff. for mixing of vertical
C                   momentum laterally, no effect for hydrostatic
C                   model, defaults to viscA4D if unset ( m^2/s )
C                   Not used if variable horiz. viscosity is used.
C     viscAhD    :: Eddy viscosity coeff. for mixing of momentum laterally
C                   (act on Divergence part) ( m^2/s )
C     viscAhZ    :: Eddy viscosity coeff. for mixing of momentum laterally
C                   (act on Vorticity  part) ( m^2/s )
C     viscA4D    :: Biharmonic viscosity coeff. for mixing of momentum laterally
C                   (act on Divergence part) ( m^4/s )
C     viscA4Z    :: Biharmonic viscosity coeff. for mixing of momentum laterally
C                   (act on Vorticity  part) ( m^4/s )
C     smag3D_coeff :: Isotropic 3-D Smagorinsky coefficient (-)
C     viscC2leith  :: Leith non-dimensional viscosity factor (grad(vort))
C     viscC2leithD :: Modified Leith non-dimensional visc. factor (grad(div))
C     viscC4leith  :: Leith non-dimensional viscosity factor (grad(vort))
C     viscC4leithD :: Modified Leith non-dimensional viscosity factor (grad(div))
C     viscC2smag   :: Smagorinsky non-dimensional viscosity factor (harmonic)
C     viscC4smag   :: Smagorinsky non-dimensional viscosity factor (biharmonic)
C     viscAhMax    :: Maximum eddy viscosity coeff. for mixing of
C                    momentum laterally ( m^2/s )
C     viscAhReMax  :: Maximum gridscale Reynolds number for eddy viscosity
C                     coeff. for mixing of momentum laterally (non-dim)
C     viscAhGrid   :: non-dimensional grid-size dependent viscosity
C     viscAhGridMax:: maximum and minimum harmonic viscosity coefficients ...
C     viscAhGridMin::  in terms of non-dimensional grid-size dependent visc.
C     viscA4Max    :: Maximum biharmonic viscosity coeff. for mixing of
C                     momentum laterally ( m^4/s )
C     viscA4ReMax  :: Maximum Gridscale Reynolds number for
C                     biharmonic viscosity coeff. momentum laterally (non-dim)
C     viscA4Grid   :: non-dimensional grid-size dependent bi-harmonic viscosity
C     viscA4GridMax:: maximum and minimum biharmonic viscosity coefficients ...
C     viscA4GridMin::  in terms of non-dimensional grid-size dependent viscosity
C     diffKhT   :: Laplacian diffusion coeff. for mixing of
C                 heat laterally ( m^2/s )
C     diffK4T   :: Biharmonic diffusion coeff. for mixing of
C                 heat laterally ( m^4/s )
C     diffKrNrT :: vertical profile of Laplacian diffusion coeff.
C                 for mixing of heat vertically ( units of r^2/s )
C     diffKr4T  :: vertical profile of Biharmonic diffusion coeff.
C                 for mixing of heat vertically ( units of r^4/s )
C     diffKhS  ::  Laplacian diffusion coeff. for mixing of
C                 salt laterally ( m^2/s )
C     diffK4S   :: Biharmonic diffusion coeff. for mixing of
C                 salt laterally ( m^4/s )
C     diffKrNrS :: vertical profile of Laplacian diffusion coeff.
C                 for mixing of salt vertically ( units of r^2/s ),
C     diffKr4S  :: vertical profile of Biharmonic diffusion coeff.
C                 for mixing of salt vertically ( units of r^4/s )
C     diffKrBL79surf :: T/S surface diffusivity (m^2/s) Bryan and Lewis, 1979
C     diffKrBL79deep :: T/S deep diffusivity (m^2/s) Bryan and Lewis, 1979
C     diffKrBL79scl  :: depth scale for arctan fn (m) Bryan and Lewis, 1979
C     diffKrBL79Ho   :: depth offset for arctan fn (m) Bryan and Lewis, 1979
C     BL79LatVary    :: polarwise of this latitude diffKrBL79 is applied with
C                       gradual transition to diffKrBLEQ towards Equator
C     diffKrBLEQsurf :: same as diffKrBL79surf but at Equator
C     diffKrBLEQdeep :: same as diffKrBL79deep but at Equator
C     diffKrBLEQscl  :: same as diffKrBL79scl but at Equator
C     diffKrBLEQHo   :: same as diffKrBL79Ho but at Equator
C     deltaT    :: Default timestep ( s )
C     deltaTClock  :: Timestep used as model "clock". This determines the
C                    IO frequencies and is used in tagging output. It can
C                    be totally different to the dynamical time. Typically
C                    it will be the deep-water timestep for accelerated runs.
C                    Frequency of checkpointing and dumping of the model state
C                    are referenced to this clock. ( s )
C     deltaTMom    :: Timestep for momemtum equations ( s )
C     dTtracerLev  :: Timestep for tracer equations ( s ), function of level k
C     deltaTFreeSurf :: Timestep for free-surface equation ( s )
C     freeSurfFac  :: Parameter to turn implicit free surface term on or off
C                     freeSurFac = 1. uses implicit free surface
C                     freeSurFac = 0. uses rigid lid
C     abEps        :: Adams-Bashforth-2 stabilizing weight
C     alph_AB      :: Adams-Bashforth-3 primary factor
C     beta_AB      :: Adams-Bashforth-3 secondary factor
C     implicSurfPress :: parameter of the Crank-Nickelson time stepping :
C                     Implicit part of Surface Pressure Gradient ( 0-1 )
C     implicDiv2DFlow :: parameter of the Crank-Nickelson time stepping :
C                     Implicit part of barotropic flow Divergence ( 0-1 )
C     implicitNHPress :: parameter of the Crank-Nickelson time stepping :
C                     Implicit part of Non-Hydrostatic Pressure Gradient ( 0-1 )
C     hFacMin      :: Minimum fraction size of a cell (affects hFacC etc...)
C     hFacMinDz    :: Minimum dimensional size of a cell (affects hFacC etc..., m)
C     hFacMinDp    :: Minimum dimensional size of a cell (affects hFacC etc..., Pa)
C     hFacMinDr    :: Minimum dimensional size of a cell (-> hFacC etc..., r units)
C     hFacInf      :: Threshold (inf and sup) for fraction size of surface cell
C     hFacSup          that control vanishing and creating levels
C     tauCD         :: CD scheme coupling timescale ( s )
C     rCD           :: CD scheme normalised coupling parameter (= 1 - deltaT/tauCD)
C     epsAB_CD      :: Adams-Bashforth-2 stabilizing weight used in CD scheme
C     baseTime      :: model base time (time origin) = time @ iteration zero
C     startTime     :: Starting time for this integration ( s ).
C     endTime       :: Ending time for this integration ( s ).
C     chkPtFreq     :: Frequency of rolling check pointing ( s ).
C     pChkPtFreq    :: Frequency of permanent check pointing ( s ).
C     dumpFreq      :: Frequency with which model state is written to
C                      post-processing files ( s ).
C     diagFreq      :: Frequency with which model writes diagnostic output
C                      of intermediate quantities.
C     afFacMom      :: Advection of momentum term tracer parameter
C     vfFacMom      :: Momentum viscosity tracer parameter
C     pfFacMom      :: Momentum pressure forcing tracer parameter
C     cfFacMom      :: Coriolis term tracer parameter
C     foFacMom      :: Momentum forcing tracer parameter
C     mtFacMom      :: Metric terms tracer parameter
C     cosPower      :: Power of cosine of latitude to multiply viscosity
C     cAdjFreq      :: Frequency of convective adjustment
C
C     taveFreq      :: Frequency with which time-averaged model state
C                      is written to post-processing files ( s ).
C     tave_lastIter :: (for state variable only) fraction of the last time
C                      step (of each taveFreq period) put in the time average.
C                      (fraction for 1rst iter = 1 - tave_lastIter)
C     tauThetaClimRelax :: Relaxation to climatology time scale ( s ).
C     tauSaltClimRelax :: Relaxation to climatology time scale ( s ).
C     latBandClimRelax :: latitude band where Relaxation to Clim. is applied,
C                         i.e. where |yC| <= latBandClimRelax
C     externForcingPeriod :: Is the period of which forcing varies (eg. 1 month)
C     externForcingCycle :: Is the repeat time of the forcing (eg. 1 year)
C                          (note: externForcingCycle must be an integer
C                           number times externForcingPeriod)
C     convertFW2Salt :: salinity, used to convert Fresh-Water Flux to Salt Flux
C                       (use model surface (local) value if set to -1)
C     temp_EvPrRn :: temperature of Rain & Evap.
C     salt_EvPrRn :: salinity of Rain & Evap.
C     temp_addMass :: temperature of addMass array
C     salt_addMass :: salinity of addMass array
C        (notes: a) tracer content of Rain/Evap only used if both
C                     NonLin_FrSurf & useRealFreshWater are set.
C                b) use model surface (local) value if set to UNSET_RL)
C     hMixCriteria:: criteria for mixed-layer diagnostic
C     dRhoSmall   :: parameter for mixed-layer diagnostic
C     hMixSmooth  :: Smoothing parameter for mixed-layer diag (default=0=no smoothing)
C     ivdc_kappa  :: implicit vertical diffusivity for convection [m^2/s]
C     sideDragFactor     :: side-drag scaling factor (used only if no_slip_sides)
C                           (default=2: full drag ; =1: gives half-slip BC)
C     bottomDragLinear    :: Linear    bottom-drag coefficient (units of [r]/s)
C     bottomDragQuadratic :: Quadratic bottom-drag coefficient (units of [r]/m)
C               (if using zcoordinate, units becomes linear: m/s, quadratic: [-])
C     smoothAbsFuncRange :: 1/2 of interval around zero, for which FORTRAN ABS
C                           is to be replace by a smoother function
C                           (affects myabs, mymin, mymax)
C     nh_Am2        :: scales the non-hydrostatic terms and changes internal scales
C                      (i.e. allows convection at different Rayleigh numbers)
C     tCylIn        :: Temperature of the cylinder inner boundary
C     tCylOut       :: Temperature of the cylinder outer boundary
C     phiEuler      :: Euler angle, rotation about original z-axis
C     thetaEuler    :: Euler angle, rotation about new x-axis
C     psiEuler      :: Euler angle, rotation about new z-axis
      COMMON /PARM_R/ cg2dTargetResidual, cg2dTargetResWunit,
     & cg2dpcOffDFac, cg3dTargetResidual,
     & delR, delRc, xgOrigin, ygOrigin, rSphere, recip_rSphere,
     & radius_fromHorizGrid, seaLev_Z, top_Pres, rSigmaBnd,
     & deltaT, deltaTMom, dTtracerLev, deltaTFreeSurf, deltaTClock,
     & abEps, alph_AB, beta_AB,
     & f0, beta, fPrime, omega, rotationPeriod,
     & viscFacAdj, viscAh, viscAhW, smag3D_coeff,
     & viscAhMax, viscAhGrid, viscAhGridMax, viscAhGridMin,
     & viscC2leith, viscC2leithD,
     & viscC2smag, viscC4smag,
     & viscAhD, viscAhZ, viscA4D, viscA4Z,
     & viscA4, viscA4W, viscA4Max,
     & viscA4Grid, viscA4GridMax, viscA4GridMin,
     & viscAhReMax, viscA4ReMax,
     & viscC4leith, viscC4leithD, viscArNr,
     & diffKhT, diffK4T, diffKrNrT, diffKr4T,
     & diffKhS, diffK4S, diffKrNrS, diffKr4S,
     & diffKrBL79surf, diffKrBL79deep, diffKrBL79scl, diffKrBL79Ho,
     & BL79LatVary,
     & diffKrBLEQsurf, diffKrBLEQdeep, diffKrBLEQscl, diffKrBLEQHo,
     & tauCD, rCD, epsAB_CD,
     & freeSurfFac, implicSurfPress, implicDiv2DFlow, implicitNHPress,
     & hFacMin, hFacMinDz, hFacInf, hFacSup,
     & gravity, recip_gravity, gBaro,
     & gravFacC, recip_gravFacC, gravFacF, recip_gravFacF,
     & rhoNil, rhoConst, recip_rhoConst, rho1Ref,
     & rhoFacC, recip_rhoFacC, rhoFacF, recip_rhoFacF, rhoConstFresh,
     & thetaConst, tRef, sRef, pRef4EOS, phiRef, dBdrRef,
     & rVel2wUnit, wUnit2rVel, mass2rUnit, rUnit2mass,
     & baseTime, startTime, endTime,
     & chkPtFreq, pChkPtFreq, dumpFreq, adjDumpFreq,
     & diagFreq, taveFreq, tave_lastIter, monitorFreq, adjMonitorFreq,
     & afFacMom, vfFacMom, pfFacMom, cfFacMom, foFacMom, mtFacMom,
     & cosPower, cAdjFreq,
     & tauThetaClimRelax, tauSaltClimRelax, latBandClimRelax,
     & externForcingCycle, externForcingPeriod,
     & convertFW2Salt, temp_EvPrRn, salt_EvPrRn,
     & temp_addMass, salt_addMass, hFacMinDr, hFacMinDp,
     & ivdc_kappa, hMixCriteria, dRhoSmall, hMixSmooth,
     & sideDragFactor, bottomDragLinear, bottomDragQuadratic, nh_Am2,
     & smoothAbsFuncRange,
     & tCylIn, tCylOut,
     & phiEuler, thetaEuler, psiEuler

      _RL cg2dTargetResidual
      _RL cg2dTargetResWunit
      _RL cg3dTargetResidual
      _RL cg2dpcOffDFac
      _RL delR(Nr)
      _RL delRc(Nr+1)
      _RL xgOrigin
      _RL ygOrigin
      _RL rSphere
      _RL recip_rSphere
      _RL radius_fromHorizGrid
      _RL seaLev_Z
      _RL top_Pres
      _RL rSigmaBnd
      _RL deltaT
      _RL deltaTClock
      _RL deltaTMom
      _RL dTtracerLev(Nr)
      _RL deltaTFreeSurf
      _RL abEps, alph_AB, beta_AB
      _RL f0
      _RL beta
      _RL fPrime
      _RL omega
      _RL rotationPeriod
      _RL freeSurfFac
      _RL implicSurfPress
      _RL implicDiv2DFlow
      _RL implicitNHPress
      _RL hFacMin
      _RL hFacMinDz
      _RL hFacMinDp
      _RL hFacMinDr
      _RL hFacInf
      _RL hFacSup
      _RL viscArNr(Nr)
      _RL viscFacAdj
      _RL viscAh
      _RL viscAhW
      _RL viscAhD
      _RL viscAhZ
      _RL smag3D_coeff
      _RL viscAhMax
      _RL viscAhReMax
      _RL viscAhGrid, viscAhGridMax, viscAhGridMin
      _RL viscC2leith
      _RL viscC2leithD
      _RL viscC2smag
      _RL viscA4
      _RL viscA4W
      _RL viscA4D
      _RL viscA4Z
      _RL viscA4Max
      _RL viscA4ReMax
      _RL viscA4Grid, viscA4GridMax, viscA4GridMin
      _RL viscC4leith
      _RL viscC4leithD
      _RL viscC4smag
      _RL diffKhT
      _RL diffK4T
      _RL diffKrNrT(Nr)
      _RL diffKr4T(Nr)
      _RL diffKhS
      _RL diffK4S
      _RL diffKrNrS(Nr)
      _RL diffKr4S(Nr)
      _RL diffKrBL79surf
      _RL diffKrBL79deep
      _RL diffKrBL79scl
      _RL diffKrBL79Ho
      _RL BL79LatVary
      _RL diffKrBLEQsurf
      _RL diffKrBLEQdeep
      _RL diffKrBLEQscl
      _RL diffKrBLEQHo
      _RL tauCD, rCD, epsAB_CD
      _RL gravity,       recip_gravity
      _RL gBaro
      _RL gravFacC(Nr),   recip_gravFacC(Nr)
      _RL gravFacF(Nr+1), recip_gravFacF(Nr+1)
      _RL rhoNil
      _RL rhoConst,      recip_rhoConst
      _RL rho1Ref(Nr)
      _RL rhoFacC(Nr),   recip_rhoFacC(Nr)
      _RL rhoFacF(Nr+1), recip_rhoFacF(Nr+1)
      _RL rhoConstFresh
      _RL thetaConst
      _RL tRef(Nr)
      _RL sRef(Nr)
      _RL pRef4EOS(Nr)
      _RL phiRef(2*Nr+1)
      _RL dBdrRef(Nr)
      _RL rVel2wUnit(Nr+1), wUnit2rVel(Nr+1)
      _RL mass2rUnit, rUnit2mass
      _RL baseTime
      _RL startTime
      _RL endTime
      _RL chkPtFreq
      _RL pChkPtFreq
      _RL dumpFreq
      _RL adjDumpFreq
      _RL diagFreq
      _RL taveFreq
      _RL tave_lastIter
      _RL monitorFreq
      _RL adjMonitorFreq
      _RL afFacMom
      _RL vfFacMom
      _RL pfFacMom
      _RL cfFacMom
      _RL foFacMom
      _RL mtFacMom
      _RL cosPower
      _RL cAdjFreq
      _RL tauThetaClimRelax
      _RL tauSaltClimRelax
      _RL latBandClimRelax
      _RL externForcingCycle
      _RL externForcingPeriod
      _RL convertFW2Salt
      _RL temp_EvPrRn
      _RL salt_EvPrRn
      _RL temp_addMass
      _RL salt_addMass
      _RL ivdc_kappa
      _RL hMixCriteria
      _RL dRhoSmall
      _RL hMixSmooth
      _RL sideDragFactor
      _RL bottomDragLinear
      _RL bottomDragQuadratic
      _RL smoothAbsFuncRange
      _RL nh_Am2
      _RL tCylIn, tCylOut
      _RL phiEuler, thetaEuler, psiEuler

C--   COMMON /PARM_A/ Thermodynamics constants ?
      COMMON /PARM_A/ HeatCapacity_Cp
      _RL HeatCapacity_Cp

C--   COMMON /PARM_ATM/ Atmospheric physical parameters (Ideal Gas EOS, ...)
C     celsius2K :: convert centigrade (Celsius) degree to Kelvin
C     atm_Po    :: standard reference pressure
C     atm_Cp    :: specific heat (Cp) of the (dry) air at constant pressure
C     atm_Rd    :: gas constant for dry air
C     atm_kappa :: kappa = R/Cp (R: constant of Ideal Gas EOS)
C     atm_Rq    :: water vapour specific volume anomaly relative to dry air
C                  (e.g. typical value = (29/18 -1) 10^-3 with q [g/kg])
C     integr_GeoPot :: option to select the way we integrate the geopotential
C                     (still a subject of discussions ...)
C     selectFindRoSurf :: select the way surf. ref. pressure (=Ro_surf) is
C             derived from the orography. Implemented: 0,1 (see INI_P_GROUND)
      COMMON /PARM_ATM/
     &            celsius2K,
     &            atm_Cp, atm_Rd, atm_kappa, atm_Rq, atm_Po,
     &            integr_GeoPot, selectFindRoSurf
      _RL celsius2K
      _RL atm_Po, atm_Cp, atm_Rd, atm_kappa, atm_Rq
      INTEGER integr_GeoPot, selectFindRoSurf

C Logical flags for selecting packages
      LOGICAL useGAD
      LOGICAL useOBCS
      LOGICAL useSHAP_FILT
      LOGICAL useZONAL_FILT
      LOGICAL useOPPS
      LOGICAL usePP81
      LOGICAL useKL10
      LOGICAL useMY82
      LOGICAL useGGL90
      LOGICAL useKPP
      LOGICAL useGMRedi
      LOGICAL useDOWN_SLOPE
      LOGICAL useBBL
      LOGICAL useCAL
      LOGICAL useEXF
      LOGICAL useBulkForce
      LOGICAL useEBM
      LOGICAL useCheapAML
      LOGICAL useAUTODIFF
      LOGICAL useGrdchk
      LOGICAL useSMOOTH
      LOGICAL usePROFILES
      LOGICAL useECCO
      LOGICAL useCTRL
      LOGICAL useSBO
      LOGICAL useFLT
      LOGICAL usePTRACERS
      LOGICAL useGCHEM
      LOGICAL useRBCS
      LOGICAL useOffLine
      LOGICAL useMATRIX
      LOGICAL useFRAZIL
      LOGICAL useSEAICE
      LOGICAL useSALT_PLUME
      LOGICAL useShelfIce
      LOGICAL useStreamIce
      LOGICAL useICEFRONT
      LOGICAL useThSIce
      LOGICAL useLand
      LOGICAL useATM2d
      LOGICAL useAIM
      LOGICAL useAtm_Phys
      LOGICAL useFizhi
      LOGICAL useGridAlt
      LOGICAL useDiagnostics
      LOGICAL useREGRID
      LOGICAL useLayers
      LOGICAL useMNC
      LOGICAL useRunClock
      LOGICAL useEMBED_FILES
      LOGICAL useMYPACKAGE
      COMMON /PARM_PACKAGES/
     &        useGAD, useOBCS, useSHAP_FILT, useZONAL_FILT,
     &        useOPPS, usePP81, useKL10, useMY82, useGGL90, useKPP,
     &        useGMRedi, useBBL, useDOWN_SLOPE,
     &        useCAL, useEXF, useBulkForce, useEBM, useCheapAML,
     &        useGrdchk, useSMOOTH, usePROFILES, useECCO, useCTRL,
     &        useSBO, useFLT, useAUTODIFF,
     &        usePTRACERS, useGCHEM, useRBCS, useOffLine, useMATRIX,
     &        useFRAZIL, useSEAICE, useSALT_PLUME, useShelfIce,
     &        useStreamIce, useICEFRONT, useThSIce, useLand,
     &        useATM2D, useAIM, useAtm_Phys, useFizhi, useGridAlt,
     &        useDiagnostics, useREGRID, useLayers, useMNC,
     &        useRunClock, useEMBED_FILES,
     &        useMYPACKAGE

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