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C $Header: /u/gcmpack/MITgcm_contrib/atnguyen/code_21Dec2012_saltplume/salt_plume_frac.F,v 1.1 2012/12/21 10:00:29 atn Exp $ |
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C $Name: $ |
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|
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#include "SALT_PLUME_OPTIONS.h" |
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|
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CBOP |
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C !ROUTINE: SALT_PLUME_FRAC |
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C !INTERFACE: |
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SUBROUTINE SALT_PLUME_FRAC( |
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I imax, fact,SPDepth, |
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U plumek, |
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I myTime, myIter, myThid ) |
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|
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C !DESCRIPTION: \bv |
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C *==========================================================* |
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C | SUBROUTINE SALT_PLUME_FRAC |
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C | o Compute saltplume penetration. |
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C *==========================================================* |
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C | Compute fraction of saltplume (flux) penetrating to |
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C | specified depth, plumek, due to rejected salt |
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C | during freezing. |
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C | For example, if surface value is Saltplume0, |
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C | and each level gets equal fraction 1/5 down to SPDepth=5, |
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C | SALT_PLUME_FRAC will report plumek = 4/5 on output if the input |
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C | plumek = 1. Else, output plumek = 0. |
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C | Reference : Duffy et al, (GRL 1999) |
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C | |
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C | ===== |
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C | Written by : ATN (based on SWFRAC) |
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C | Date : Sep 13, 2007 |
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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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#include "SIZE.h" |
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#include "SALT_PLUME.h" |
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#include "EEPARAMS.h" |
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|
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C !INPUT/OUTPUT PARAMETERS: |
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C input arguments |
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C imax :: number of vertical grid points |
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C fact :: scale factor to apply to depth array |
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C SPDpeth :: corresponding SaltPlumeDepth(i,j) at this grid point |
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C myTime :: Current time in simulation |
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C myIter :: Current iteration number in simulation |
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C myThid :: My Thread Id. number |
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INTEGER imax |
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_RL fact |
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_RL myTime |
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INTEGER myIter |
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INTEGER myThid |
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C input/output arguments |
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C SPDEPTH(2):: identical value of salt_plume_depth |
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C plumek :: on input: vertical depth for desired plume fraction |
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C (fact*plumek) is negative distance (m) from surface |
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C plumek :: on output: saltplume contribution fraction |
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_RL plumek(imax), SPDepth(imax) |
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CEOP |
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|
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#ifdef ALLOW_SALT_PLUME |
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|
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C !LOCAL VARIABLES: |
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_RL facz, dd, dd20 |
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INTEGER i |
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#ifndef TARGET_NEC_SX |
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INTEGER kk |
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#endif |
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_RL three, S, So, tiny |
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parameter( three = 3. _d 0, tiny = 1. _d -5 ) |
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C This is an abbreviation of 1./(exp(1.)-1.) |
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_RL recip_expOneM1 |
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parameter( recip_expOneM1 = 0.581976706869326343 ) |
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|
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IF(plumek(1).LE.SPDepth(1) .and. plumek(2).GE.SPDepth(1)) THEN |
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plumek(2) = SPDepth(1) |
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ENDIF |
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|
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DO i = 1,imax |
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facz = abs(fact*plumek(i)) |
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IF (SPDepth(i).GE.facz .and. SPDepth(i) .GT. zeroRL) THEN |
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|
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C Default: uniform distribution, PlumeMethod=1, Npower=0 |
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IF (PlumeMethod .EQ. 1) THEN |
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dd20 = (abs(SPDepth(i))) |
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#ifdef TARGET_NEC_SX |
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IF ( dd20 .GT. 0. _d 0 ) THEN |
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S = (facz/dd20) |
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C crazy attempt to make the code faster and raise tempN to |
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C (Npower+1) |
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IF (Npower .GT. 0) S = S*S**Npower |
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ELSE |
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S = 0. _d 0 |
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ENDIF |
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plumek(i) = max(zeroRL,S) |
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#else |
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S = oneRL !input depth temp |
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So = oneRL |
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DO kk=1,Npower+1 |
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S = facz*S !raise to the Npower+1 |
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So = dd20*So |
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ENDDO |
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plumek(i) = max(zeroRL,S/So) |
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#endif /* TARGET_NEC_SX */ |
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|
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ELSEIF (PlumeMethod .EQ. 2) THEN !exponential distribution |
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dd = abs(SPDepth(i)) |
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So=exp(oneRL)-oneRL |
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S =exp(facz/dd)-oneRL |
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plumek(i) = max(zeroRL,S/So) |
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|
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C PlumeMethod = 3, distribute salt LINEARLY between SPDepth and SPDepth/SPovershoot |
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C (1-SPovershoot)% has already been taken into account in SPDepth calculation, |
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C i.e., SPDepth = SPovershoot*SPDepth. |
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ELSEIF (PlumeMethod .EQ. 3) THEN !overshoot 20% |
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dd20 = (abs(SPDepth(i))) |
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dd = dd20/SPovershoot |
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So=dd20-dd |
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S =facz-dd |
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IF( (facz.GE.dd).AND.(facz.LT.dd20) ) THEN |
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plumek(i) = max(zeroRL,S/So) |
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ELSE |
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plumek(i) = zeroRL |
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ENDIF |
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C PlumeMethod = 5, dumping all salt at the top layer |
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ELSEIF (PlumeMethod .EQ. 5) THEN |
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IF( (facz.GE.0.0).AND.(facz.LT.1.0) ) THEN |
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plumek(i) = zeroRL |
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ELSE |
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plumek(i) = oneRL |
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ENDIF |
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ELSEIF (PlumeMethod .EQ. 6) THEN |
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C PLumeMethod = 6, currently only works for Npower = 1 and 2. |
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dd20 = (abs(SPDepth(i))) |
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#ifdef TARGET_NEC_SX |
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IF ( dd20 .GT. 0. _d 0 ) THEN |
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S = (facz/dd20) |
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C crazy attempt to make the code faster and raise tempN to |
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C (Npower+1) |
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IF (Npower .GT. 0) S = S*S**Npower |
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So = 1. _d 0/dd20 |
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ELSE |
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S = 0. _d 0 |
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So = 0. _d 0 |
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ENDIF |
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IF(Npower.EQ.1) THEN !Npower=1 |
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plumek(i) = max(zeroRL,twoRL*So*facz-S) |
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ELSE !Npower=2 |
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plumek(i) = max(zeroRL, |
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& three*So*facz - three*So*So*facz*facz |
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& + tempN) |
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ENDIF |
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#else |
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S = oneRL !input depth temp |
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So = oneRL |
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DO kk=1,Npower+1 |
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S = facz*S !raise to the Npower+1 |
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So = dd20*So |
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ENDDO |
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IF(Npower.EQ.1) THEN !Npower=1 |
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plumek(i) = max(zeroRL,twoRL/dd20*facz-S/So) |
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ELSE !Npower=2 |
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plumek(i) = max(zeroRL, |
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& three/dd20*facz - three/(dd20*dd20)*facz*facz |
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& + S/So) |
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ENDIF |
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#endif /* TARGET_NEC_SX */ |
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|
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ELSEIF (PlumeMethod .EQ. 7) THEN |
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C PLumeMethod = 7, dump an offset parabolla with more salt at surface |
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C tapered to zero at depth SPDepth/2, then increased until SPDepth |
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C need input SPDepth, NPower = percentage of SPDepth |
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C Ex: if Npower = 10 -> (10/2)=5% of SPDepth |
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C NPower can be negative integer here. |
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C 0 -> parabola centered at SPDepth/2; |
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C + -> parabola offset, salt @ surface < @ SPDepth |
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C - -> parabola offset, salt @ surface > @ SPDepth |
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C S and So are dummy variables |
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dd = (abs(SPDepth(i))) |
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dd20 = dd*(oneRL/twoRL-Npower/200. _d 0) |
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So = (dd*dd*dd/three) |
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& -(dd*dd) *dd20 |
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& +(dd) *dd20*dd20 |
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S = (facz*facz *facz/three) |
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& - (facz*facz)*dd20 |
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& + (facz) *dd20*dd20 |
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plumek(i) = max(zeroRL,(S/So)) |
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|
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#ifndef TARGET_NEC_SX |
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ELSE |
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WRITE(*,*) 'salt_plume_frac: PLumeMethod =', PLumeMethod, |
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& 'not implemented' |
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STOP 'ABNORMAL in S/R SALT_PLUME_FRAC' |
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#endif /* not TARGET_NEC_SX */ |
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ENDIF |
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ELSE |
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plumek(i) = zeroRL |
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ENDIF |
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ENDDO |
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|
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#endif /* ALLOW_SALT_PLUME */ |
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|
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RETURN |
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END |
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