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C $Header: /u/gcmpack/MITgcm_contrib/bling/pkg/bling_light.F,v 1.2 2016/02/28 21:49:24 mmazloff Exp $ |
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C $Name: $ |
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#include "BLING_OPTIONS.h" |
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CBOP |
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subroutine BLING_LIGHT( |
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I mld, |
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U irr_inst, irr_eff, |
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I bi, bj, imin, imax, jmin, jmax, |
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I myIter, myTime, myThid ) |
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C ================================================================= |
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C | subroutine bling_light |
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C | o calculate effective light for phytoplankton growth |
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C | There are multiple types of light. |
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C | - irr_inst is the instantaneous irradiance field. |
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C | - irr_mix is the same, but with the irr_inst averaged throughout |
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C | the mixed layer. This quantity is intended to represent the |
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C | light to which phytoplankton subject to turbulent transport in |
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C | the mixed-layer would be exposed. |
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C | - irr_mem is a temporally smoothed field carried between |
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C | timesteps, to represent photoadaptation. |
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C | - irr_eff is the effective irradiance for photosynthesis, |
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C | given either by irr_inst or irr_mix, depending on model |
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C | options and location. |
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C ================================================================= |
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implicit none |
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C === Global variables === |
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C irr_inst :: Instantaneous irradiance |
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C irr_mem :: Phyto irradiance memory |
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#include "SIZE.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 "GRID.h" |
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#include "DYNVARS.h" |
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#include "BLING_VARS.h" |
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#include "PTRACERS_SIZE.h" |
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#include "PTRACERS_PARAMS.h" |
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#ifdef ALLOW_AUTODIFF |
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# include "tamc.h" |
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#endif |
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C === Routine arguments === |
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C bi,bj :: tile indices |
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C iMin,iMax :: computation domain: 1rst index range |
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C jMin,jMax :: computation domain: 2nd index range |
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C myTime :: current time |
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C myIter :: current timestep |
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C myThid :: thread Id. number |
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INTEGER bi, bj, imin, imax, jmin, jmax |
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INTEGER myThid |
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INTEGER myIter |
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_RL myTime |
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C === Input === |
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_RL mld (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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C === Output === |
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C irr_inst :: instantaneous light |
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C irr_eff :: effective light for photosynthesis |
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_RL irr_inst (1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr) |
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_RL irr_eff (1-OLx:sNx+OLx,1-OLy:sNy+OLy,Nr) |
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C === Local variables === |
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_RL solar, albedo |
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_RL dayfrac, yday, delta |
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_RL lat, sun1, dayhrs |
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_RL cosz, frac, fluxi |
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_RL atten |
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_RL irr_surf (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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#ifdef ML_MEAN_LIGHT |
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_RL irr_mix (1-OLx:sNx+OLx,1-OLy:sNy+OLy) |
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_RL SumMLIrr |
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_RL tmp_ML |
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#endif |
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#ifndef READ_PAR |
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#ifndef USE_QSW |
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_RL sfac (1-OLy:sNy+OLy) |
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#endif |
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#endif |
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integer i,j,k |
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CEOP |
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DO k=1,Nr |
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DO j=jmin,jmax |
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DO i=imin,imax |
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irr_eff(i,j,k) = 0. _d 0 |
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ENDDO |
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ENDDO |
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ENDDO |
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c --------------------------------------------------------------------- |
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c Surface insolation |
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#ifndef USE_EXFQSW |
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c From pkg/dic/dic_insol |
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c find light as function of date and latitude |
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c based on paltridge and parson |
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solar = 1360. _d 0 !solar constant |
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albedo = 0.6 _d 0 !planetary albedo |
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C Case where a 2-d output array is needed: for now, stop here. |
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IF ( usingCurvilinearGrid .OR. rotateGrid ) THEN |
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STOP 'ABNORMAL END: S/R INSOL: 2-D output not implemented' |
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ENDIF |
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C find day (****NOTE for year starting in winter*****) |
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dayfrac=mod(myTime,360. _d 0*86400. _d 0) |
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& /(360. _d 0*86400. _d 0) !fraction of year |
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yday = 2. _d 0*PI*dayfrac !convert to radians |
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delta = (0.006918 _d 0 |
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& -(0.399912 _d 0*cos(yday)) !cosine zenith angle |
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& +(0.070257 _d 0*sin(yday)) !(paltridge+platt) |
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& -(0.006758 _d 0*cos(2. _d 0*yday)) |
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& +(0.000907 _d 0*sin(2. _d 0*yday)) |
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& -(0.002697 _d 0*cos(3. _d 0*yday)) |
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& +(0.001480 _d 0*sin(3. _d 0*yday)) ) |
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DO j=1-OLy,sNy+OLy |
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C latitude in radians |
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lat=YC(1,j,1,bj)*deg2rad |
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C latitute in radians, backed out from coriolis parameter |
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C (makes latitude independent of grid) |
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IF ( usingCartesianGrid .OR. usingCylindricalGrid ) |
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& lat = asin( fCori(1,j,1,bj)/(2. _d 0*omega) ) |
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sun1 = -sin(delta)/cos(delta) * sin(lat)/cos(lat) |
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IF (sun1.LE.-0.999 _d 0) sun1=-0.999 _d 0 |
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IF (sun1.GE. 0.999 _d 0) sun1= 0.999 _d 0 |
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dayhrs = abs(acos(sun1)) |
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cosz = ( sin(delta)*sin(lat)+ !average zenith angle |
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& (cos(delta)*cos(lat)*sin(dayhrs)/dayhrs) ) |
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IF (cosz.LE.5. _d -3) cosz= 5. _d -3 |
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frac = dayhrs/PI !fraction of daylight in day |
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C daily average photosynthetically active solar radiation just below surface |
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fluxi = solar*(1. _d 0-albedo)*cosz*frac*parfrac |
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C convert to sfac |
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sfac(j) = MAX(1. _d -5,fluxi) |
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ENDDO !j |
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#endif |
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c --------------------------------------------------------------------- |
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c instantaneous light, mixed layer averaged light |
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DO j=jmin,jmax |
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DO i=imin,imax |
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c Photosynthetically-available radiations (PAR) |
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#ifdef USE_EXFQSW |
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irr_surf(i,j) = max(epsln, |
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& -parfrac*Qsw(i,j,bi,bj)*maskC(i,j,1,bi,bj)) |
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#else |
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irr_surf(i,j) = sfac(j) |
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#endif |
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cav IF ( .NOT. QSW_underice ) THEN |
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c if using Qsw but not seaice/thsice or coupled, then |
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c ice fraction needs to be taken into account |
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cav irr_surf(i,j) = irr_surf(i,j)*(1. _d 0 - FIce(i,j,bi,bj)) |
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cav ENDIF |
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#ifdef ML_MEAN_LIGHT |
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SumMLIrr = 0. _d 0 |
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tmp_ML = 0. _d 0 |
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#endif |
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DO k=1,Nr |
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IF (hFacC(i,j,k,bi,bj).gt.0) THEN |
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IF (k.eq.1) THEN |
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c Light attenuation in middle of top layer |
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atten = k0*drF(1)/2. _d 0*hFacC(i,j,1,bi,bj) |
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irr_inst(i,j,1) = irr_surf(i,j)*exp(-atten) |
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ELSE |
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c Attenuation from one more layer |
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atten = k0*drF(k)/2. _d 0*hFacC(i,j,k,bi,bj) |
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& + k0*drF(k-1)/2. _d 0*hFacC(i,j,k-1,bi,bj) |
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irr_inst(i,j,k) = |
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& irr_inst(i,j,k-1)*exp(-atten) |
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ENDIF |
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#ifdef ML_MEAN_LIGHT |
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c Mean irradiance in the mixed layer |
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IF ((-rf(k+1) .le. mld(i,j)).and. |
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& (-rf(k+1).lt.200. _d 0)) THEN |
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SumMLIrr = SumMLIrr+drF(k)*irr_inst(i,j,k) |
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tmp_ML = tmp_ML + drF(k) |
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irr_mix(i,j) = SumMLIrr/tmp_ML |
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ENDIF |
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#endif |
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ENDIF |
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ENDDO |
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ENDDO |
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ENDDO |
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DO k=1,Nr |
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DO j=jmin,jmax |
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DO i=imin,imax |
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IF (hFacC(i,j,k,bi,bj) .gt. 0. _d 0) THEN |
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irr_eff(i,j,k) = irr_inst(i,j,k) |
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#ifdef ML_MEAN_LIGHT |
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c Inside mixed layer, effective light is set to mean mixed layer light |
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IF ((-rf(k+1) .le. mld(i,j)).and. |
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& (-rf(k+1).lt.200. _d 0)) THEN |
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irr_eff(i,j,k) = irr_mix(i,j) |
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ENDIF |
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#endif |
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ENDIF |
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ENDDO |
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ENDDO |
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ENDDO |
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#ifdef ALLOW_DIAGNOSTICS |
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IF ( useDiagnostics ) THEN |
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CALL DIAGNOSTICS_FILL(Qsw,'BLGQSW ',0,1,1,bi,bj,myThid) |
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CALL DIAGNOSTICS_FILL(irr_inst,'BLGIRRIS',0,Nr,2,bi,bj,myThid) |
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ENDIF |
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#endif |
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RETURN |
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END |
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