| 1 |
C $Header: /u/gcmpack/MITgcm/pkg/seaice/seaice_solve4temp.F,v 1.26 2012/02/05 21:06:54 jmc Exp $ |
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C $Name: $ |
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|
| 4 |
#include "SEAICE_OPTIONS.h" |
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#ifdef ALLOW_EXF |
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# include "EXF_OPTIONS.h" |
| 7 |
#endif |
| 8 |
|
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CBOP |
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C !ROUTINE: SEAICE_SOLVE4TEMP |
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C !INTERFACE: |
| 12 |
SUBROUTINE SEAICE_SOLVE4TEMP( |
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I UG, HICE_ACTUAL, HSNOW_ACTUAL, |
| 14 |
#ifdef SEAICE_ADD_SUBLIMATION_TO_FWBUDGET |
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I F_lh_max, |
| 16 |
#endif |
| 17 |
U TSURF, |
| 18 |
O F_ia, IcePenetSW, |
| 19 |
O FWsublim, |
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I bi, bj, myTime, myIter, myThid ) |
| 21 |
|
| 22 |
C !DESCRIPTION: \bv |
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C *==========================================================* |
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C | SUBROUTINE SOLVE4TEMP |
| 25 |
C | o Calculate ice growth rate, surface fluxes and |
| 26 |
C | temperature of ice surface. |
| 27 |
C | see Hibler, MWR, 108, 1943-1973, 1980 |
| 28 |
C *==========================================================* |
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C \ev |
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|
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C !USES: |
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IMPLICIT NONE |
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C === Global variables === |
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#include "SIZE.h" |
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#include "GRID.h" |
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#include "EEPARAMS.h" |
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#include "PARAMS.h" |
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#include "FFIELDS.h" |
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#include "SEAICE_SIZE.h" |
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#include "SEAICE_PARAMS.h" |
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#include "SEAICE.h" |
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#ifdef SEAICE_VARIABLE_FREEZING_POINT |
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#include "DYNVARS.h" |
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#endif /* SEAICE_VARIABLE_FREEZING_POINT */ |
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#ifdef ALLOW_EXF |
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# include "EXF_FIELDS.h" |
| 47 |
#endif |
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#ifdef ALLOW_AUTODIFF_TAMC |
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# include "tamc.h" |
| 50 |
#endif |
| 51 |
|
| 52 |
C !INPUT PARAMETERS: |
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C UG :: atmospheric wind speed (m/s) |
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C HICE_ACTUAL :: actual ice thickness |
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C HSNOW_ACTUAL :: actual snow thickness |
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C TSURF :: surface temperature of ice/snow in Kelvin |
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C bi,bj :: tile indices |
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C myTime :: current time in simulation |
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C myIter :: iteration number in simulation |
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C myThid :: my Thread Id number |
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C !OUTPUT PARAMETERS: |
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C TSURF :: updated surface temperature of ice/snow in Kelvin |
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C F_ia :: upward seaice/snow surface heat flux to atmosphere (W/m^2) |
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C IcePenetSW :: short wave heat flux transmitted through ice (+=upward) |
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C FWsublim :: fresh water (mass) flux due to sublimation (+=up)(kg/m^2/s) |
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C---- Notes: |
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C 1) should add IcePenetSW to F_ia to get the net surface heat flux |
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C from the atmosphere (IcePenetSW not currently included in F_ia) |
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C 2) since zero ice/snow heat capacity is assumed, all the absorbed Short |
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C -Wave is used to warm the ice/snow surface (heating profile ignored). |
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C---------- |
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_RL UG (1:sNx,1:sNy) |
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_RL HICE_ACTUAL (1:sNx,1:sNy) |
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_RL HSNOW_ACTUAL(1:sNx,1:sNy) |
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#ifdef SEAICE_ADD_SUBLIMATION_TO_FWBUDGET |
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_RL F_lh_max (1:sNx,1:sNy) |
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#endif |
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_RL TSURF (1-OLx:sNx+OLx,1-OLy:sNy+OLy,nSx,nSy) |
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_RL F_ia (1:sNx,1:sNy) |
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_RL IcePenetSW (1:sNx,1:sNy) |
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_RL FWsublim (1:sNx,1:sNy) |
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INTEGER bi, bj |
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_RL myTime |
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INTEGER myIter, myThid |
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CEOP |
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|
| 87 |
#if defined(ALLOW_ATM_TEMP) && defined(ALLOW_DOWNWARD_RADIATION) |
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C !LOCAL VARIABLES: |
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C === Local variables === |
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C i, j :: Loop counters |
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C kSrf :: vertical index of surface layer |
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INTEGER i, j |
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#ifdef SEAICE_VARIABLE_FREEZING_POINT |
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INTEGER kSrf |
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#endif /* SEAICE_VARIABLE_FREEZING_POINT */ |
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INTEGER ITER |
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C TB :: ocean temperature in contact with ice (=seawater freezing point) (K) |
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_RL TB (1:sNx,1:sNy) |
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_RL D1, D1I |
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_RL D3(1:sNx,1:sNy) |
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_RL TMELT, XKI, XKS, HCUT, XIO |
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C SurfMeltTemp :: Temp (K) above which wet-albedo values are used |
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_RL SurfMeltTemp |
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C effConduct :: effective conductivity of combined ice and snow |
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_RL effConduct(1:sNx,1:sNy) |
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C lhSublim :: latent heat of sublimation (SEAICE_lhEvap + SEAICE_lhFusion) |
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_RL lhSublim |
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C t1,t2,t3,t4 :: powers of temperature |
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_RL t1, t2, t3, t4 |
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|
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C- Constants to calculate Saturation Vapor Pressure |
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C Maykut Polynomial Coeff. for Sat. Vapor Press |
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_RL C1, C2, C3, C4, C5, QS1 |
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C Extended temp-range expon. relation Coeff. for Sat. Vapor Press |
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_RL lnTEN |
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_RL aa1,aa2,bb1,bb2,Ppascals,cc0,cc1,cc2,cc3t |
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C specific humidity at ice surface variables |
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_RL mm_pi,mm_log10pi |
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|
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C F_c :: conductive heat flux through seaice+snow (+=upward) |
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C F_lwu :: upward long-wave surface heat flux (+=upward) |
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C F_sens :: sensible surface heat flux (+=upward) |
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C F_lh :: latent heat flux (sublimation) (+=upward) |
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C qhice :: saturation vapor pressure of snow/ice surface |
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C dqh_dTs :: derivative of qhice w.r.t snow/ice surf. temp |
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C dFia_dTs :: derivative of surf heat flux (F_ia) w.r.t surf. temp |
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_RL F_c (1:sNx,1:sNy) |
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_RL F_lwu (1:sNx,1:sNy) |
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_RL F_sens (1:sNx,1:sNy) |
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_RL F_lh (1:sNx,1:sNy) |
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_RL qhice (1:sNx,1:sNy) |
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_RL dqh_dTs (1:sNx,1:sNy) |
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_RL dFia_dTs (1:sNx,1:sNy) |
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_RL absorbedSW (1:sNx,1:sNy) |
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_RL penetSWFrac |
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_RL delTsurf |
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|
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C local copies of global variables |
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_RL tsurfLoc (1:sNx,1:sNy) |
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_RL tsurfPrev (1:sNx,1:sNy) |
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_RL atempLoc (1:sNx,1:sNy) |
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_RL lwdownLoc (1:sNx,1:sNy) |
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_RL ALB (1:sNx,1:sNy) |
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_RL ALB_ICE (1:sNx,1:sNy) |
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_RL ALB_SNOW (1:sNx,1:sNy) |
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C iceOrNot :: this is HICE_ACTUAL.GT.0. |
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LOGICAL iceOrNot(1:sNx,1:sNy) |
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#ifdef SEAICE_DEBUG |
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C F_io_net :: upward conductive heat flux through seaice+snow |
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C F_ia_net :: net heat flux divergence at the sea ice/snow surface: |
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C includes ice conductive fluxes and atmospheric fluxes (W/m^2) |
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_RL F_io_net |
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_RL F_ia_net |
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#endif /* SEAICE_DEBUG */ |
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|
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C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
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|
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#ifdef ALLOW_AUTODIFF_TAMC |
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CADJ INIT comlev1_solve4temp = COMMON, sNx*sNy*NMAX_TICE |
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#endif /* ALLOW_AUTODIFF_TAMC */ |
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|
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C- MAYKUT CONSTANTS FOR SAT. VAP. PRESSURE TEMP. POLYNOMIAL |
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C1= 2.7798202 _d -06 |
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C2= -2.6913393 _d -03 |
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C3= 0.97920849 _d +00 |
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C4= -158.63779 _d +00 |
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C5= 9653.1925 _d +00 |
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QS1=0.622 _d +00/1013.0 _d +00 |
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C- Extended temp-range expon. relation Coeff. for Sat. Vapor Press |
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lnTEN = LOG(10.0 _d 0) |
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aa1 = 2663.5 _d 0 |
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aa2 = 12.537 _d 0 |
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bb1 = 0.622 _d 0 |
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bb2 = 1.0 _d 0 - bb1 |
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Ppascals = 100000. _d 0 |
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C cc0 = TEN ** aa2 |
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cc0 = EXP(aa2*lnTEN) |
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cc1 = cc0*aa1*bb1*Ppascals*lnTEN |
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cc2 = cc0*bb2 |
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|
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#ifdef SEAICE_VARIABLE_FREEZING_POINT |
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kSrf = 1 |
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#endif /* SEAICE_VARIABLE_FREEZING_POINT */ |
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|
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C SENSIBLE HEAT CONSTANT |
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D1=SEAICE_dalton*SEAICE_cpAir*SEAICE_rhoAir |
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|
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C ICE LATENT HEAT CONSTANT |
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lhSublim = SEAICE_lhEvap + SEAICE_lhFusion |
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D1I=SEAICE_dalton*lhSublim*SEAICE_rhoAir |
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|
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C MELTING TEMPERATURE OF ICE |
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TMELT = celsius2K |
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|
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C ICE CONDUCTIVITY |
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XKI=SEAICE_iceConduct |
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|
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C SNOW CONDUCTIVITY |
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XKS=SEAICE_snowConduct |
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|
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C CUTOFF SNOW THICKNESS |
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C Snow-Thickness above HCUT: SW optically thick snow (=> snow-albedo). |
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C Snow-Thickness below HCUT: linear transition to ice-albedo |
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HCUT = SEAICE_snowThick |
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|
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C Wet/dry albebo temperature threshold |
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SEAICE_wetAlbTemp = - 1. _d -3 |
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|
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C PENETRATION SHORTWAVE RADIATION FACTOR |
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XIO=SEAICE_shortwave |
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|
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C Temperature Threshold for wet-albedo: |
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SurfMeltTemp = TMELT + SEAICE_wetAlbTemp |
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C old SOLVE4TEMP_LEGACY setting, consistent with former celsius2K value: |
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c TMELT = 273.16 _d +00 |
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c SurfMeltTemp = 273.159 _d +00 |
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|
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C Initialize variables |
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DO J=1,sNy |
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DO I=1,sNx |
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C HICE_ACTUAL is modified in this routine, but at the same time |
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C used to decided where there is ice, therefore we save this information |
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C here in a separate array |
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iceOrNot (I,J) = HICE_ACTUAL(I,J) .GT. 0. _d 0 |
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IcePenetSW(I,J) = 0. _d 0 |
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absorbedSW(I,J) = 0. _d 0 |
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qhice (I,J) = 0. _d 0 |
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dqh_dTs (I,J) = 0. _d 0 |
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F_ia (I,J) = 0. _d 0 |
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F_lh (I,J) = 0. _d 0 |
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F_lwu (I,J) = 0. _d 0 |
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F_sens (I,J) = 0. _d 0 |
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C Make a local copy of LW, surface & atmospheric temperatures |
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tsurfLoc (I,J) = TSURF(I,J,bi,bj) |
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c tsurfLoc (I,J) = MIN( celsius2K+MAX_TICE, TSURF(I,J,bi,bj) ) |
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lwdownLoc(I,J) = MAX( MIN_LWDOWN, LWDOWN(I,J,bi,bj) ) |
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atempLoc (I,J) = MAX( celsius2K+MIN_ATEMP, ATEMP(I,J,bi,bj) ) |
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|
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C FREEZING TEMPERATURE OF SEAWATER |
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#ifdef SEAICE_VARIABLE_FREEZING_POINT |
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C Use a variable seawater freezing point |
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TB(I,J) = -0.0575 _d 0*salt(I,J,kSrf,bi,bj) + 0.0901 _d 0 |
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& + celsius2K |
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#else |
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C Use a constant freezing temperature (SEAICE_VARIABLE_FREEZING_POINT undef) |
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C old SOLVE4TEMP_LEGACY setting (not consistent with seaice_growth value) |
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c TB(I,J) = 271.2 _d 0 |
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TB(I,J) = celsius2K + SEAICE_freeze |
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#endif /* SEAICE_VARIABLE_FREEZING_POINT */ |
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|
| 251 |
C Now determine fixed (relative to tsurf) forcing term in heat budget |
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|
| 253 |
IF(HSNOW_ACTUAL(I,J).GT.0.0) THEN |
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C Stefan-Boltzmann constant times emissivity |
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D3(I,J)=SEAICE_snow_emiss*SEAICE_boltzmann |
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#ifdef EXF_LWDOWN_WITH_EMISSIVITY |
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C This is now [(1-emiss)*lwdown - lwdown] |
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lwdownLoc(I,J) = SEAICE_snow_emiss*lwdownLoc(I,J) |
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#else /* use the old hard wired inconsistent value */ |
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lwdownLoc(I,J) = 0.97 _d 0*lwdownLoc(I,J) |
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#endif /* EXF_LWDOWN_WITH_EMISSIVITY */ |
| 262 |
ELSE |
| 263 |
C Stefan-Boltzmann constant times emissivity |
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D3(I,J)=SEAICE_ice_emiss*SEAICE_boltzmann |
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#ifdef EXF_LWDOWN_WITH_EMISSIVITY |
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C This is now [(1-emiss)*lwdown - lwdown] |
| 267 |
lwdownLoc(I,J) = SEAICE_ice_emiss*lwdownLoc(I,J) |
| 268 |
#else /* use the old hard wired inconsistent value */ |
| 269 |
lwdownLoc(I,J) = 0.97 _d 0*lwdownLoc(I,J) |
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#endif /* EXF_LWDOWN_WITH_EMISSIVITY */ |
| 271 |
ENDIF |
| 272 |
ENDDO |
| 273 |
ENDDO |
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|
| 275 |
DO J=1,sNy |
| 276 |
DO I=1,sNx |
| 277 |
|
| 278 |
C DECIDE ON ALBEDO |
| 279 |
IF ( iceOrNot(I,J) ) THEN |
| 280 |
|
| 281 |
IF ( YC(I,J,bi,bj) .LT. 0.0 _d 0 ) THEN |
| 282 |
IF (tsurfLoc(I,J) .GE. SurfMeltTemp) THEN |
| 283 |
ALB_ICE (I,J) = SEAICE_wetIceAlb_south |
| 284 |
ALB_SNOW(I,J) = SEAICE_wetSnowAlb_south |
| 285 |
ELSE ! no surface melting |
| 286 |
ALB_ICE (I,J) = SEAICE_dryIceAlb_south |
| 287 |
ALB_SNOW(I,J) = SEAICE_drySnowAlb_south |
| 288 |
ENDIF |
| 289 |
ELSE !/ Northern Hemisphere |
| 290 |
IF (tsurfLoc(I,J) .GE. SurfMeltTemp) THEN |
| 291 |
ALB_ICE (I,J) = SEAICE_wetIceAlb |
| 292 |
ALB_SNOW(I,J) = SEAICE_wetSnowAlb |
| 293 |
ELSE ! no surface melting |
| 294 |
ALB_ICE (I,J) = SEAICE_dryIceAlb |
| 295 |
ALB_SNOW(I,J) = SEAICE_drySnowAlb |
| 296 |
ENDIF |
| 297 |
ENDIF !/ Albedo for snow and ice |
| 298 |
|
| 299 |
C If actual snow thickness exceeds the cutoff thickness, use snow albedo |
| 300 |
IF (HSNOW_ACTUAL(I,J) .GT. HCUT) THEN |
| 301 |
ALB(I,J) = ALB_SNOW(I,J) |
| 302 |
ELSEIF ( HCUT.LE.ZERO ) THEN |
| 303 |
ALB(I,J) = ALB_ICE(I,J) |
| 304 |
ELSE |
| 305 |
C otherwise, use linear transition between ice and snow albedo |
| 306 |
ALB(I,J) = MIN( ALB_ICE(I,J) + HSNOW_ACTUAL(I,J)/HCUT |
| 307 |
& *(ALB_SNOW(I,J) -ALB_ICE(I,J)) |
| 308 |
& , ALB_SNOW(I,J) ) |
| 309 |
ENDIF |
| 310 |
|
| 311 |
C Determine the fraction of shortwave radiative flux remaining |
| 312 |
C at ocean interface after scattering through the snow and ice. |
| 313 |
C If snow is present, no radiation penetrates through snow+ice |
| 314 |
IF (HSNOW_ACTUAL(I,J) .GT. 0.0 _d 0) THEN |
| 315 |
penetSWFrac = 0.0 _d 0 |
| 316 |
ELSE |
| 317 |
penetSWFrac = XIO*EXP(-1.5 _d 0 * HICE_ACTUAL(I,J)) |
| 318 |
ENDIF |
| 319 |
C The shortwave radiative flux leaving ocean beneath ice (+=up). |
| 320 |
IcePenetSW(I,J) = -(1.0 _d 0 - ALB(I,J)) |
| 321 |
& *penetSWFrac * SWDOWN(I,J,bi,bj) |
| 322 |
C The shortwave radiative flux convergence in the seaice. |
| 323 |
absorbedSW(I,J) = (1.0 _d 0 - ALB(I,J)) |
| 324 |
& *(1.0 _d 0 - penetSWFrac)* SWDOWN(I,J,bi,bj) |
| 325 |
|
| 326 |
C The effective conductivity of the two-layer snow/ice system. |
| 327 |
C Set a minimum sea ice thickness of 5 cm to bound |
| 328 |
C the magnitude of conductive heat fluxes. |
| 329 |
Cif * now taken care of by SEAICE_hice_reg in seaice_growth |
| 330 |
c hice_tmp = max(HICE_ACTUAL(I,J),5. _d -2) |
| 331 |
effConduct(I,J) = XKI * XKS / |
| 332 |
& (XKS * HICE_ACTUAL(I,J) + XKI * HSNOW_ACTUAL(I,J)) |
| 333 |
|
| 334 |
#ifdef SEAICE_DEBUG |
| 335 |
IF ( (I .EQ. SEAICE_debugPointI) .AND. |
| 336 |
& (J .EQ. SEAICE_debugPointJ) ) THEN |
| 337 |
print '(A,i6)','-----------------------------------' |
| 338 |
print '(A,i6)','ibi merged initialization ', myIter |
| 339 |
print '(A,i6,4(1x,D24.15))', |
| 340 |
& 'ibi iter, TSL, TS ',myIter, |
| 341 |
& tsurfLoc(I,J), TSURF(I,J,bi,bj) |
| 342 |
print '(A,i6,4(1x,D24.15))', |
| 343 |
& 'ibi iter, TMELT ',myIter,TMELT |
| 344 |
print '(A,i6,4(1x,D24.15))', |
| 345 |
& 'ibi iter, HIA, EFKCON ',myIter, |
| 346 |
& HICE_ACTUAL(I,J), effConduct(I,J) |
| 347 |
print '(A,i6,4(1x,D24.15))', |
| 348 |
& 'ibi iter, HSNOW ',myIter, |
| 349 |
& HSNOW_ACTUAL(I,J), ALB(I,J) |
| 350 |
print '(A,i6)','-----------------------------------' |
| 351 |
print '(A,i6)','ibi energy balance iterat ', myIter |
| 352 |
ENDIF |
| 353 |
#endif /* SEAICE_DEBUG */ |
| 354 |
|
| 355 |
ENDIF !/* iceOrNot */ |
| 356 |
ENDDO !/* i */ |
| 357 |
ENDDO !/* j */ |
| 358 |
|
| 359 |
C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
| 360 |
DO ITER=1,IMAX_TICE |
| 361 |
DO J=1,sNy |
| 362 |
DO I=1,sNx |
| 363 |
#ifdef ALLOW_AUTODIFF_TAMC |
| 364 |
iicekey = I + sNx*(J-1) + (ITER-1)*sNx*sNy |
| 365 |
CADJ STORE tsurfLoc(i,j) = comlev1_solve4temp, |
| 366 |
CADJ & key = iicekey, byte = isbyte |
| 367 |
#endif /* ALLOW_AUTODIFF_TAMC */ |
| 368 |
|
| 369 |
C- save tsurf from previous iter |
| 370 |
tsurfPrev(I,J) = tsurfLoc(I,J) |
| 371 |
IF ( iceOrNot(I,J) ) THEN |
| 372 |
|
| 373 |
t1 = tsurfLoc(I,J) |
| 374 |
t2 = t1*t1 |
| 375 |
t3 = t2*t1 |
| 376 |
t4 = t2*t2 |
| 377 |
|
| 378 |
C-- Calculate the specific humidity in the BL above the snow/ice |
| 379 |
IF ( useMaykutSatVapPoly ) THEN |
| 380 |
C- Use the Maykut polynomial |
| 381 |
qhice(I,J)=QS1*(C1*t4+C2*t3 +C3*t2+C4*t1+C5) |
| 382 |
dqh_dTs(I,J) = 0. _d 0 |
| 383 |
ELSE |
| 384 |
C- Use exponential relation approx., more accurate at low temperatures |
| 385 |
C log 10 of the sat vap pressure |
| 386 |
mm_log10pi = -aa1 / t1 + aa2 |
| 387 |
C The saturation vapor pressure (SVP) in the surface |
| 388 |
C boundary layer (BL) above the snow/ice. |
| 389 |
c mm_pi = TEN **(mm_log10pi) |
| 390 |
C The following form does the same, but is faster |
| 391 |
mm_pi = EXP(mm_log10pi*lnTEN) |
| 392 |
qhice(I,J) = bb1*mm_pi/( Ppascals -(1.0 _d 0 - bb1)*mm_pi ) |
| 393 |
C A constant for SVP derivative w.r.t TICE |
| 394 |
c cc3t = TEN **(aa1 / t1) |
| 395 |
C The following form does the same, but is faster |
| 396 |
cc3t = EXP(aa1 / t1 * lnTEN) |
| 397 |
C d(qh)/d(TICE) |
| 398 |
dqh_dTs(I,J) = cc1*cc3t/((cc2-cc3t*Ppascals)**2 *t2) |
| 399 |
ENDIF |
| 400 |
|
| 401 |
C Calculate the flux terms based on the updated tsurfLoc |
| 402 |
F_c(I,J) = effConduct(I,J)*(TB(I,J)-tsurfLoc(I,J)) |
| 403 |
F_lh(I,J) = D1I*UG(I,J)*(qhice(I,J)-AQH(I,J,bi,bj)) |
| 404 |
#ifdef SEAICE_ADD_SUBLIMATION_TO_FWBUDGET |
| 405 |
C if the latent heat flux implied by tsurfLoc exceeds |
| 406 |
C F_lh_max, cap F_lh and decouple the flux magnitude from TICE |
| 407 |
IF (F_lh(I,J) .GT. F_lh_max(I,J)) THEN |
| 408 |
F_lh(I,J) = F_lh_max(I,J) |
| 409 |
dqh_dTs(I,J) = ZERO |
| 410 |
ENDIF |
| 411 |
#endif /* SEAICE_ADD_SUBLIMATION_TO_FWBUDGET */ |
| 412 |
|
| 413 |
F_lwu(I,J) = t4 * D3(I,J) |
| 414 |
F_sens(I,J)= D1 * UG(I,J) * (t1 - atempLoc(I,J)) |
| 415 |
F_ia(I,J) = -lwdownLoc(I,J) -absorbedSW(I,J) + F_lwu(I,J) |
| 416 |
& + F_sens(I,J) + F_lh(I,J) |
| 417 |
C d(F_ia)/d(Tsurf) |
| 418 |
dFia_dTs(I,J) = 4.0 _d 0*D3(I,J)*t3 + D1*UG(I,J) |
| 419 |
& + D1I*UG(I,J)*dqh_dTs(I,J) |
| 420 |
|
| 421 |
#ifdef SEAICE_DEBUG |
| 422 |
IF ( (I .EQ. SEAICE_debugPointI) .AND. |
| 423 |
& (J .EQ. SEAICE_debugPointJ) ) THEN |
| 424 |
print '(A,i6,4(1x,D24.15))', |
| 425 |
& 'ice-iter qhICE, ', ITER,qhIce(I,J) |
| 426 |
print '(A,i6,4(1x,D24.15))', |
| 427 |
& 'ice-iter dFiDTs1 F_ia ', ITER, |
| 428 |
& dFia_dTs(I,J)+effConduct(I,J), F_ia(I,J)-F_c(I,J) |
| 429 |
ENDIF |
| 430 |
#endif /* SEAICE_DEBUG */ |
| 431 |
|
| 432 |
C- Update tsurf as solution of : Fc = Fia + d/dT(Fia - Fc) *delta.tsurf |
| 433 |
tsurfLoc(I,J) = tsurfLoc(I,J) |
| 434 |
& + ( F_c(I,J)-F_ia(I,J) ) / ( effConduct(I,J)+dFia_dTs(I,J) ) |
| 435 |
|
| 436 |
IF ( useMaykutSatVapPoly ) THEN |
| 437 |
tsurfLoc(I,J) = MAX( celsius2K+MIN_TICE, tsurfLoc(I,J) ) |
| 438 |
ENDIF |
| 439 |
C If the search leads to tsurfLoc < 50 Kelvin, restart the search |
| 440 |
C at tsurfLoc = TMELT. Note that one solution to the energy balance problem |
| 441 |
C is an extremely low temperature - a temperature far below realistic values. |
| 442 |
c IF (tsurfLoc(I,J) .LT. 50.0 _d 0 ) tsurfLoc(I,J) = TMELT |
| 443 |
C Comments & code above not relevant anymore (from older version, when |
| 444 |
C trying Maykut-Polynomial & dqh_dTs > 0 ?): commented out |
| 445 |
tsurfLoc(I,J) = MIN( tsurfLoc(I,J), TMELT ) |
| 446 |
|
| 447 |
#ifdef SEAICE_DEBUG |
| 448 |
IF ( (I .EQ. SEAICE_debugPointI) .AND. |
| 449 |
& (J .EQ. SEAICE_debugPointJ) ) THEN |
| 450 |
print '(A,i6,4(1x,D24.15))', |
| 451 |
& 'ice-iter tsurfLc,|dif|', ITER, |
| 452 |
& tsurfLoc(I,J), |
| 453 |
& LOG10(ABS(tsurfLoc(I,J) - t1)) |
| 454 |
ENDIF |
| 455 |
#endif /* SEAICE_DEBUG */ |
| 456 |
|
| 457 |
ENDIF !/* iceOrNot */ |
| 458 |
ENDDO !/* i */ |
| 459 |
ENDDO !/* j */ |
| 460 |
ENDDO !/* Iterations */ |
| 461 |
C---+----1----+----2----+----3----+----4----+----5----+----6----+----7-|--+----| |
| 462 |
|
| 463 |
DO J=1,sNy |
| 464 |
DO I=1,sNx |
| 465 |
IF ( iceOrNot(I,J) ) THEN |
| 466 |
|
| 467 |
C Save updated tsurf and finalize the flux terms |
| 468 |
TSURF(I,J,bi,bj) = tsurfLoc(I,J) |
| 469 |
|
| 470 |
#ifdef SEAICE_MODIFY_GROWTH_ADJ |
| 471 |
Cgf no additional dependency through solver, snow, etc. |
| 472 |
IF ( SEAICEadjMODE.GE.2 ) THEN |
| 473 |
CALL ZERO_ADJ_1D( 1, TSURF(I,J,bi,bj), myThid) |
| 474 |
absorbedSW(I,J) = 0.3 _d 0 *SWDOWN(I,J,bi,bj) |
| 475 |
IcePenetSW(I,J)= 0. _d 0 |
| 476 |
ENDIF |
| 477 |
IF ( postSolvTempIter.EQ.2 .OR. SEAICEadjMODE.GE.2 ) THEN |
| 478 |
t1 = TSURF(I,J,bi,bj) |
| 479 |
#else /* SEAICE_MODIFY_GROWTH_ADJ */ |
| 480 |
|
| 481 |
IF ( postSolvTempIter.EQ.2 ) THEN |
| 482 |
C Recalculate the fluxes based on the (possibly) adjusted TSURF |
| 483 |
t1 = tsurfLoc(I,J) |
| 484 |
#endif /* SEAICE_MODIFY_GROWTH_ADJ */ |
| 485 |
t2 = t1*t1 |
| 486 |
t3 = t2*t1 |
| 487 |
t4 = t2*t2 |
| 488 |
|
| 489 |
IF ( useMaykutSatVapPoly ) THEN |
| 490 |
qhice(I,J)=QS1*(C1*t4+C2*t3 +C3*t2+C4*t1+C5) |
| 491 |
ELSE |
| 492 |
C log 10 of the sat vap pressure |
| 493 |
mm_log10pi = -aa1 / t1 + aa2 |
| 494 |
C saturation vapor pressure |
| 495 |
c mm_pi = TEN **(mm_log10pi) |
| 496 |
C The following form does the same, but is faster |
| 497 |
mm_pi = EXP(mm_log10pi*lnTEN) |
| 498 |
C over ice specific humidity |
| 499 |
qhice(I,J) = bb1*mm_pi/( Ppascals -(1.0 _d 0 - bb1)*mm_pi ) |
| 500 |
ENDIF |
| 501 |
F_c(I,J) = effConduct(I,J) * (TB(I,J) - t1) |
| 502 |
F_lh(I,J) = D1I * UG(I,J)*(qhice(I,J)-AQH(I,J,bi,bj)) |
| 503 |
#ifdef SEAICE_ADD_SUBLIMATION_TO_FWBUDGET |
| 504 |
IF (F_lh(I,J) .GT. F_lh_max(I,J)) THEN |
| 505 |
F_lh(I,J) = F_lh_max(I,J) |
| 506 |
ENDIF |
| 507 |
#endif /* SEAICE_ADD_SUBLIMATION_TO_FWBUDGET */ |
| 508 |
F_lwu(I,J) = t4 * D3(I,J) |
| 509 |
F_sens(I,J) = D1 * UG(I,J) * (t1 - atempLoc(I,J)) |
| 510 |
C The flux between the ice/snow surface and the atmosphere. |
| 511 |
F_ia(I,J) = -lwdownLoc(I,J) -absorbedSW(I,J) + F_lwu(I,J) |
| 512 |
& + F_sens(I,J) + F_lh(I,J) |
| 513 |
|
| 514 |
ELSEIF ( postSolvTempIter.EQ.1 ) THEN |
| 515 |
C Update fluxes (consistent with the linearized formulation) |
| 516 |
delTsurf = tsurfLoc(I,J)-tsurfPrev(I,J) |
| 517 |
F_c(I,J) = effConduct(I,J)*(TB(I,J)-tsurfLoc(I,J)) |
| 518 |
F_ia(I,J) = F_ia(I,J) + dFia_dTs(I,J)*delTsurf |
| 519 |
F_lh(I,J) = F_lh(I,J) |
| 520 |
& + D1I*UG(I,J)*dqh_dTs(I,J)*delTsurf |
| 521 |
|
| 522 |
c ELSEIF ( postSolvTempIter.EQ.0 ) THEN |
| 523 |
C Take fluxes from last iteration |
| 524 |
|
| 525 |
ELSEIF ( postSolvTempIter.NE.0 ) THEN |
| 526 |
STOP 'SEAICE_SOLVE4TEMP: invalid postSolvTempIter' |
| 527 |
ENDIF |
| 528 |
|
| 529 |
C Fresh water flux (kg/m^2/s) from latent heat of sublimation. |
| 530 |
C F_lh is positive upward (sea ice looses heat) and FWsublim |
| 531 |
C is also positive upward (atmosphere gains freshwater) |
| 532 |
FWsublim(I,J) = F_lh(I,J)/lhSublim |
| 533 |
|
| 534 |
#ifdef SEAICE_DEBUG |
| 535 |
C Calculate the net ice-ocean and ice-atmosphere fluxes |
| 536 |
IF (F_c(I,J) .GT. 0.0 _d 0) THEN |
| 537 |
F_io_net = F_c(I,J) |
| 538 |
F_ia_net = 0.0 _d 0 |
| 539 |
ELSE |
| 540 |
F_io_net = 0.0 _d 0 |
| 541 |
F_ia_net = F_ia(I,J) |
| 542 |
ENDIF !/* conductive fluxes up or down */ |
| 543 |
|
| 544 |
IF ( (I .EQ. SEAICE_debugPointI) .AND. |
| 545 |
& (J .EQ. SEAICE_debugPointJ) ) THEN |
| 546 |
print '(A)','----------------------------------------' |
| 547 |
print '(A,i6)','ibi complete ', myIter |
| 548 |
print '(A,4(1x,D24.15))', |
| 549 |
& 'ibi T(SURF, surfLoc,atmos) ', |
| 550 |
& TSURF(I,J,bi,bj), tsurfLoc(I,J),atempLoc(I,J) |
| 551 |
print '(A,4(1x,D24.15))', |
| 552 |
& 'ibi LWL ', lwdownLoc(I,J) |
| 553 |
print '(A,4(1x,D24.15))', |
| 554 |
& 'ibi QSW(Total, Penetrating)', |
| 555 |
& SWDOWN(I,J,bi,bj), IcePenetSW(I,J) |
| 556 |
print '(A,4(1x,D24.15))', |
| 557 |
& 'ibi qh(ATM ICE) ', |
| 558 |
& AQH(I,J,bi,bj),qhice(I,J) |
| 559 |
print '(A,4(1x,D24.15))', |
| 560 |
& 'ibi F(lwd,swi,lwu) ', |
| 561 |
& -lwdownLoc(I,J), -absorbedSW(I,J), F_lwu(I,J) |
| 562 |
print '(A,4(1x,D24.15))', |
| 563 |
& 'ibi F(c,lh,sens) ', |
| 564 |
& F_c(I,J), F_lh(I,J), F_sens(I,J) |
| 565 |
#ifdef SEAICE_ADD_SUBLIMATION_TO_FWBUDGET |
| 566 |
IF (F_lh_max(I,J) .GT. ZERO) THEN |
| 567 |
print '(A,4(1x,D24.15))', |
| 568 |
& 'ibi F_lh_max, F_lh/lhmax) ', |
| 569 |
& F_lh_max(I,J), F_lh(I,J)/ F_lh_max(I,J) |
| 570 |
ELSE |
| 571 |
print '(A,4(1x,D24.15))', |
| 572 |
& 'ibi F_lh_max = ZERO! ' |
| 573 |
ENDIF |
| 574 |
print '(A,4(1x,D24.15))', |
| 575 |
& 'ibi FWsub, FWsubm*dT/rhoI ', |
| 576 |
& FWsublim(I,J), |
| 577 |
& FWsublim(I,J)*SEAICE_deltaTtherm/SEAICE_rhoICE |
| 578 |
#endif /* SEAICE_ADD_SUBLIMATION_TO_FWBUDGET */ |
| 579 |
print '(A,4(1x,D24.15))', |
| 580 |
& 'ibi F_ia, F_ia_net, F_c ', |
| 581 |
& F_ia(I,J), F_ia_net, F_c(I,J) |
| 582 |
print '(A)','----------------------------------------' |
| 583 |
ENDIF |
| 584 |
#endif /* SEAICE_DEBUG */ |
| 585 |
|
| 586 |
ENDIF !/* iceOrNot */ |
| 587 |
ENDDO !/* i */ |
| 588 |
ENDDO !/* j */ |
| 589 |
|
| 590 |
#endif /* ALLOW_ATM_TEMP && ALLOW_DOWNWARD_RADIATION */ |
| 591 |
RETURN |
| 592 |
END |
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