| 1 | subroutine hazecloud(ngrid,nlayer,nq,ptimestep, & |
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| 2 | pplay,pplev,pq,pdq,pdist_sol,mu0,pfluxuv,zdqhaze, & |
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| 3 | zdqphot_prec,zdqphot_ch4,zdqconv_prec,declin) |
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| 4 | |
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| 5 | ! zdqphot_ch4,zdqconv_prec,declin,zdqhaze_col) |
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| 6 | |
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| 7 | use comgeomfi_h |
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| 8 | use comcstfi_mod, only: pi, g |
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| 9 | use tracer_h, only: igcm_haze, igcm_ch4_gas, igcm_prec_haze, noms, mmol |
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| 10 | use geometry_mod, only: longitude, latitude ! in radians |
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| 11 | use callkeys_mod, only: hazeconservch4, diurnal |
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| 12 | |
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| 13 | implicit none |
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| 14 | |
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| 15 | !================================================================== |
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| 16 | ! Purpose |
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| 17 | ! ------- |
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| 18 | ! Production of haze in the atmosphere |
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| 19 | ! |
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| 20 | ! Inputs |
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| 21 | ! ------ |
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| 22 | ! ngrid Number of vertical columns |
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| 23 | ! nlayer Number of layers |
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| 24 | ! pplay(ngrid,nlayer) Pressure layers |
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| 25 | ! pplev(ngrid,nlayer+1) Pressure levels |
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| 26 | ! |
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| 27 | ! Outputs |
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| 28 | ! ------- |
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| 29 | ! |
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| 30 | ! Both |
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| 31 | ! ---- |
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| 32 | ! |
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| 33 | ! Authors |
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| 34 | ! ------- |
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| 35 | ! Tanguy Bertrand and Francois Forget (2014) |
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| 36 | ! |
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| 37 | !================================================================== |
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| 38 | |
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| 39 | |
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| 40 | !----------------------------------------------------------------------- |
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| 41 | ! Arguments |
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| 42 | |
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| 43 | INTEGER ngrid, nlayer, nq |
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| 44 | ! REAL lati(ngrid) |
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| 45 | ! REAL long(ngrid) |
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| 46 | ! REAL declin |
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| 47 | LOGICAL firstcall |
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| 48 | SAVE firstcall |
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| 49 | DATA firstcall/.true./ |
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| 50 | REAL ptimestep |
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| 51 | REAL pplay(ngrid,nlayer),pplev(ngrid,nlayer+1) |
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| 52 | REAL,INTENT(IN) :: pq(ngrid,nlayer,nq) |
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| 53 | REAL,INTENT(IN) :: pdq(ngrid,nlayer,nq) |
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| 54 | ! REAL,INTENT(IN) :: mmol(nq) |
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| 55 | REAL,INTENT(IN) :: pdist_sol ! distance SUN-pluto in AU |
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| 56 | REAL,INTENT(IN) :: pfluxuv ! Lyman alpha flux at specific Ls (ph/cm/s) |
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| 57 | REAL,INTENT(IN) :: mu0(ngrid) ! cosinus of solar incident flux |
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| 58 | REAL,INTENT(IN) :: declin ! distance SUN-pluto in AU |
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| 59 | REAL,INTENT(OUT) :: zdqhaze(ngrid,nlayer,nq) ! Final tendancy |
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| 60 | ! REAL,INTENT(OUT) :: zdqhaze_col(ngrid) ! Final tendancy haze prod |
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| 61 | !----------------------------------------------------------------------- |
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| 62 | ! Local variables |
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| 63 | |
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| 64 | INTEGER l,ig,iq |
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| 65 | REAL zq_ch4(ngrid,nlayer) |
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| 66 | REAL zq_prec(ngrid,nlayer) |
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| 67 | REAL tauch4(nlayer) |
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| 68 | REAL sigch4 ! aborption cross section ch4 cm-2 mol-1 |
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| 69 | REAL flym_sol_earth ! initial flux Earth ph.m-2.s-1 |
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| 70 | REAL flym_sol_pluto ! initial Lyman alpha SOLAR flux Pluto ph.m-2.s-1 |
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| 71 | REAL flym_ipm(ngrid) ! top of atm. Incident IPM (Interplanetary) flux Lyman alpha ph.m-2.s-1 |
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| 72 | REAL fluxlym_sol(nlayer+1) ! Local Solar flux Lyman alpha ph.m-2.s-1 |
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| 73 | REAL fluxlym_ipm(nlayer+1) ! Local IPM (Interplanetary) flux Lyman alpha ph.m-2.s-1 |
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| 74 | REAL mu_ipm(ngrid) ! local Mean incident flux for IPM Lyman alpha photons |
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| 75 | REAL mu_sol(ngrid) ! local Mean incident flux for solar lyman alpha photons |
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| 76 | |
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| 77 | REAL gradflux(nlayer) ! gradient flux Lyman alpha ph.m-2.s-1 |
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| 78 | REAL zdqphot_ch4(ngrid,nlayer) ! tendancy due to photolysis of ch4 |
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| 79 | REAL zdqphot_prec(ngrid,nlayer) ! tendancy due to photolysis of ch4 |
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| 80 | REAL zdqconv_prec(ngrid,nlayer) ! tendancy due to conversion of |
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| 81 | ! prec_haze into haze |
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| 82 | REAL kch4 ! fraction of Carbon from ch4 directly dissociated |
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| 83 | ! by prec_haze |
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| 84 | CHARACTER(len=10) :: tname |
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| 85 | REAL ncratio ! ration Nitrogen/Carbon observed in tholins |
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| 86 | REAL tcon ! Time constant: conversion in aerosol |
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| 87 | REAL avogadro ! avogadro constant |
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| 88 | |
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| 89 | REAL longit |
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| 90 | REAL latit |
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| 91 | REAL valmin |
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| 92 | REAL valmax |
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| 93 | REAL valmin_dl |
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| 94 | REAL puis |
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| 95 | REAL dist |
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| 96 | REAL long2 |
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| 97 | !----------------------------------------------------------------------- |
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| 98 | |
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| 99 | !---------------- INPUT ------------------------------------------------ |
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| 100 | |
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| 101 | avogadro = 6.022141e23 |
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| 102 | sigch4 = 1.85e-17 ! aborption cross section ch4 cm-2 mol-1 |
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| 103 | !! Initial Solar flux Lyman alpha on Earth (1AU) |
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| 104 | flym_sol_earth=pfluxuv*1.e15 ! ph.m-2.s-1 -> 5e+11 ph.cm-2.s-1 |
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| 105 | !! Initial Solar flux Lyman alpha on Pluto |
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| 106 | flym_sol_pluto=flym_sol_earth/(pdist_sol*pdist_sol) ! ph.m-2.s-1 |
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| 107 | ! option decrease by 12% the initial IPM flux to account for Interplanetary H absorption: |
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| 108 | ! Fig 3 Gladstone et al 2014 : Lyalpha at Pluto |
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| 109 | flym_sol_pluto=flym_sol_pluto*0.878 |
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| 110 | |
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| 111 | !!!! Top of atm. Incident IPM (Interplanetary) flux Lyman alpha ph.m-2.s-1 |
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| 112 | ! fit Fig. 4 in Randall Gladstone et al. (2015) |
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| 113 | ! -- New version : Integration over semi sphere of Gladstone data. |
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| 114 | ! Fit of results |
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| 115 | |
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| 116 | IF (ngrid.eq.1) THEN |
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| 117 | flym_ipm(1)=75.e10 |
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| 118 | mu_ipm(1) = 0.5 !max(mu0(1), 0.5) |
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| 119 | mu_sol(1)=0.25 |
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| 120 | ELSE IF (.not.diurnal) THEN |
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| 121 | flym_ipm(:)= mu0(:)*75.e10 |
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| 122 | mu_sol(:) = mu0(:) |
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| 123 | mu_ipm(:) = max(mu_sol(:), 0.5) |
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| 124 | ELSE |
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| 125 | ! 1) get longitude/latitude (rad) of anti-subsolar point (max de mu0 - 180) |
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| 126 | longit=longitude((MAXLOC(mu0,DIM=1,MASK=mu0.GT.0.9))) ! rad |
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| 127 | IF (longit.GE.0) THEN |
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| 128 | longit=longit-pi |
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| 129 | ELSE |
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| 130 | longit=longit+pi |
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| 131 | ENDIF |
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| 132 | latit=-declin ! rad |
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| 133 | |
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| 134 | ! 2) Define input parameter for the fit |
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| 135 | valmin=48.74e10 ! minimum value of ipm flux in ph/m2/s |
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| 136 | valmax=115.014e10 ! maximal value of ipm flux in ph/m2/s |
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| 137 | valmin_dl=74.5e10 ! daylight minimum value |
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| 138 | puis=3.5 |
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| 139 | |
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| 140 | ! 3) Loop for each location and fit |
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| 141 | DO ig=1,ngrid |
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| 142 | ! calculation of cosinus of incident angle for IPM flux |
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| 143 | mu_sol(ig) = mu0(ig) |
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| 144 | mu_ipm(ig) = max(mu_sol(ig), 0.5) |
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| 145 | IF (mu0(ig).LT.1.e-4) THEN |
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| 146 | dist=acos(sin(latitude(ig))*sin(latit)+cos(latitude(ig))* & |
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| 147 | cos(latit)*cos(longit-longitude(ig)))*180/pi |
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| 148 | IF (dist.gt.90) dist=90 |
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| 149 | flym_ipm(ig)=(valmin_dl-valmin)/(90.**puis)*(dist)**puis & |
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| 150 | +valmin |
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| 151 | ELSE |
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| 152 | flym_ipm(ig)= mu0(ig)*(valmax-valmin_dl)+valmin_dl |
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| 153 | ENDIF |
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| 154 | ! proportional to lyman alpha solar flux (reference 2015 : 5e11 ph/cm2/s) |
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| 155 | flym_ipm(ig)=flym_ipm(ig)*pfluxuv/5. |
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| 156 | ENDDO ! nlayer |
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| 157 | |
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| 158 | |
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| 159 | ENDIF ! ngrid |
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| 160 | !--- |
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| 161 | |
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| 162 | !! Time constant of conversion in aerosol to be explore |
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| 163 | tcon= 1.e7 ! 153 ! 1.E7 !second |
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| 164 | ! tcon= 1. ! 153 ! 1.E7 !second |
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| 165 | !! Parameter of conversion precurseur to haze |
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| 166 | kch4=1. |
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| 167 | ncratio=0.5 ! boost for haze considering nitrogen contribution |
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| 168 | ! ratio n/c : =0.25 if there is 1N for 3C |
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| 169 | IF (firstcall) then |
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| 170 | write(*,*) 'hazecloud: haze parameters:' |
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| 171 | write(*,*) 'tcon, kch4, ncratio = ' , tcon, kch4, ncratio |
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| 172 | firstcall=.false. |
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| 173 | ENDIF |
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| 174 | ! note: mu0 = cos(solar zenith angle) |
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| 175 | ! max(mu0) = declin |
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| 176 | |
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| 177 | !!---------------------------------------------------------- |
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| 178 | !!---------------------------------------------------------- |
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| 179 | |
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| 180 | DO ig=1,ngrid |
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| 181 | |
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| 182 | zq_ch4(ig,:)=0. |
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| 183 | zq_prec(ig,:)=0. |
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| 184 | zdqconv_prec(ig,:)=0. |
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| 185 | zdqhaze(ig,:,:)=0. |
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| 186 | zdqphot_prec(ig,:)=0. |
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| 187 | zdqphot_ch4(ig,:)=0. |
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| 188 | tauch4(:)=0. |
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| 189 | gradflux(:)=0. |
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| 190 | fluxlym_sol(1:nlayer)=0. |
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| 191 | fluxlym_sol(nlayer+1)=flym_sol_pluto*mu_sol(ig) ! |
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| 192 | fluxlym_ipm(nlayer+1)= flym_ipm(ig) |
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| 193 | |
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| 194 | DO l=nlayer,1,-1 |
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| 195 | !! Actualisation tracer ch4 and prec_haze |
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| 196 | |
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| 197 | !IF (ngrid.eq.1) THEN |
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| 198 | !! option zq_ch4 = cte |
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| 199 | ! zq_ch4(ig,l)=0.01*0.5*16./28. ! Temporaire |
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| 200 | !ELSE |
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| 201 | zq_ch4(ig,l)=pq(ig,l,igcm_ch4_gas)+ & |
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| 202 | pdq(ig,l,igcm_ch4_gas)*ptimestep |
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| 203 | !ENDIF |
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| 204 | if (zq_ch4(ig,l).lt.0.) then |
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| 205 | zq_ch4(ig,l)=0. |
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| 206 | endif |
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| 207 | |
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| 208 | !! option zq_ch4 = cte |
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| 209 | ! zq_ch4(ig,l)=0.1*16./28. ! Temporaire |
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| 210 | |
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| 211 | zq_prec(ig,l)=pq(ig,l,igcm_prec_haze)+ & |
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| 212 | pdq(ig,l,igcm_prec_haze)*ptimestep |
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| 213 | |
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| 214 | !! Calculation optical depth ch4 in Lyman alpha for each layer l |
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| 215 | tauch4(l)=sigch4*1.e-4*avogadro* & |
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| 216 | (zq_ch4(ig,l)/(mmol(igcm_ch4_gas)*1.e-3))* & |
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| 217 | (pplev(ig,l)-pplev(ig,l+1))/g |
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| 218 | !! Calculation of Flux in each layer l |
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| 219 | if (mu_sol(ig).gt.1.e-6) then |
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| 220 | fluxlym_sol(l)=fluxlym_sol(l+1)*exp(-tauch4(l)/mu_sol(ig)) |
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| 221 | endif |
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| 222 | |
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| 223 | fluxlym_ipm(l)=fluxlym_ipm(l+1)*exp(-tauch4(l)/mu_ipm(ig)) |
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| 224 | |
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| 225 | gradflux(l)=fluxlym_sol(l+1)-fluxlym_sol(l) & |
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| 226 | + fluxlym_ipm(l+1)-fluxlym_ipm(l) |
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| 227 | !! tendancy on ch4 |
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| 228 | !! considering 1 photon destroys 1 ch4 by photolysis |
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| 229 | zdqphot_ch4(ig,l)=-mmol(igcm_ch4_gas)*1.e-3/avogadro* & |
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| 230 | gradflux(l)*g/(pplev(ig,l)-pplev(ig,l+1)) |
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| 231 | |
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| 232 | !! tendency of prec created by photolysis of ch4 |
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| 233 | zdqphot_prec(ig,l)=-zdqphot_ch4(ig,l) |
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| 234 | |
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| 235 | !! update precurseur zq_prec |
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| 236 | zq_prec(ig,l)=zq_prec(ig,l)+ & |
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| 237 | zdqphot_prec(ig,l)*ptimestep |
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| 238 | |
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| 239 | !! Conversion of prec_haze into haze |
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| 240 | !! controlled by the time constant tcon |
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| 241 | !! New tendancy for prec_haze |
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| 242 | zdqconv_prec(ig,l) = -zq_prec(ig,l)* & |
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| 243 | (1-exp(-ptimestep/tcon))/ptimestep |
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| 244 | |
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| 245 | ENDDO ! nlayer |
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| 246 | |
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| 247 | !! Final tendancy for prec_haze and haze |
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| 248 | |
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| 249 | DO iq=1,nq |
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| 250 | tname=noms(iq) |
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| 251 | !print*, 'TB17 tname=',tname,tname(1:4) |
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| 252 | if (tname(1:4).eq."haze") then |
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| 253 | zdqhaze(ig,:,iq) = -zdqconv_prec(ig,:)* & |
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| 254 | kch4*(1.+ncratio*14./12.) |
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| 255 | else if (noms(iq).eq."prec_haze") then |
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| 256 | zdqhaze(ig,:,igcm_prec_haze)= zdqphot_prec(ig,:) + & |
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| 257 | zdqconv_prec(ig,:) |
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| 258 | |
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| 259 | else if (noms(iq).eq."ch4_gas".and.(.not.hazeconservch4)) then |
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| 260 | zdqhaze(ig,:,igcm_ch4_gas)= zdqphot_ch4(ig,:) |
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| 261 | endif |
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| 262 | ENDDO |
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| 263 | |
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| 264 | ENDDO ! ngrid |
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| 265 | |
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| 266 | |
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| 267 | !! tendency kg/m2/s for haze column: |
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| 268 | ! zdqhaze_col(:)=0. |
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| 269 | ! DO ig=1,ngrid |
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| 270 | ! DO l=1,nlayer |
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| 271 | ! zdqhaze_col(ig)=zdqhaze_col(ig)+zdqhaze(ig,l,igcm_haze)* & |
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| 272 | ! (pplev(ig,l)-pplev(ig,l+1))/g |
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| 273 | ! ENDDO |
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| 274 | ! ENDDO |
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| 275 | |
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| 276 | end subroutine hazecloud |
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| 277 | |
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