| 1 | SUBROUTINE nirco2abs(ngrid,nlayer,pplay,dist_sol,nq,pq, |
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| 2 | $ mu0,fract,declin,pdtnirco2) |
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| 3 | |
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| 4 | use tracer_mod, only: igcm_co2, igcm_o |
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| 5 | use comgeomfi_h, only: sinlon, coslon, sinlat, coslat |
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| 6 | USE comcstfi_h, ONLY: pi |
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| 7 | USE time_phylmdz_mod, ONLY: daysec |
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| 8 | IMPLICIT NONE |
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| 9 | c======================================================================= |
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| 10 | c subject: |
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| 11 | c -------- |
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| 12 | c Computing heating rate due to |
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| 13 | c absorption by CO2 in the near-infrared |
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| 14 | c This version includes NLTE effects |
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| 15 | c |
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| 16 | c (Scheme to be described in Forget et al., JGR, 2003) |
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| 17 | c (old Scheme described in Forget et al., JGR, 1999) |
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| 18 | c |
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| 19 | c This version updated with a new functional fit, |
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| 20 | c see NLTE correction-factor of Lopez-Valverde et al (1998) |
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| 21 | c Stephen Lewis 2000 |
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| 22 | c |
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| 23 | c jul 2011 malv+fgg New corrections for NLTE implemented |
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| 24 | c 08/2002 : correction for bug when running with diurnal=F |
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| 25 | c |
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| 26 | c author: Frederic Hourdin 1996 |
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| 27 | c ------ |
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| 28 | c Francois Forget 1999 |
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| 29 | c |
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| 30 | c input: |
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| 31 | c ----- |
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| 32 | c ngrid number of gridpoint of horizontal grid |
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| 33 | c nlayer Number of layer |
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| 34 | c dist_sol sun-Mars distance (AU) |
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| 35 | c mu0(ngrid) |
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| 36 | c fract(ngrid) day fraction of the time interval |
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| 37 | c declin latitude of subslar point |
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| 38 | c |
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| 39 | c output: |
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| 40 | c ------- |
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| 41 | c |
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| 42 | c pdtnirco2(ngrid,nlayer) Heating rate (K/s) |
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| 43 | c |
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| 44 | c |
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| 45 | c======================================================================= |
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| 46 | c |
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| 47 | c 0. Declarations : |
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| 48 | c ------------------ |
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| 49 | c |
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| 50 | include "callkeys.h" |
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| 51 | include "nirdata.h" |
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| 52 | |
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| 53 | c----------------------------------------------------------------------- |
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| 54 | c Input/Output |
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| 55 | c ------------ |
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| 56 | integer,intent(in) :: ngrid ! number of (horizontal) grid points |
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| 57 | integer,intent(in) :: nlayer ! number of atmospheric layers |
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| 58 | real,intent(in) :: pplay(ngrid,nlayer) ! Pressure |
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| 59 | real,intent(in) :: dist_sol ! Sun-Mars distance (in AU) |
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| 60 | integer,intent(in) :: nq ! number of tracers |
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| 61 | real,intent(in) :: pq(ngrid,nlayer,nq) ! tracers |
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| 62 | real,intent(in) :: mu0(ngrid) ! solar angle |
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| 63 | real,intent(in) :: fract(ngrid) ! day fraction of the time interval |
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| 64 | real,intent(in) :: declin ! latitude of sub-solar point |
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| 65 | |
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| 66 | real,intent(out) :: pdtnirco2(ngrid,nlayer) ! heating rate (K/s) |
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| 67 | c |
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| 68 | c Local variables : |
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| 69 | c ----------------- |
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| 70 | INTEGER l,ig, n, nstep,i |
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| 71 | REAL co2heat0, zmu(ngrid) |
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| 72 | |
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| 73 | c special diurnal=F |
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| 74 | real mu0_int(ngrid),fract_int(ngrid),zday_int |
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| 75 | real ztim1,ztim2,ztim3,step |
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| 76 | |
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| 77 | c |
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| 78 | c local saved variables |
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| 79 | c --------------------- |
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| 80 | logical,save :: firstcall=.true. |
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| 81 | integer,save :: ico2=0 ! index of "co2" tracer |
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| 82 | integer,save :: io=0 ! index of "o" tracer |
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| 83 | c p0noonlte is a pressure below which non LTE effects are significant. |
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| 84 | c REAL p0nonlte |
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| 85 | c DATA p0nonlte/7.5e-3/ |
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| 86 | c SAVE p0nonlte |
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| 87 | |
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| 88 | c parameters for CO2 heating fit |
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| 89 | real,parameter :: n_a=1.1956475 |
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| 90 | real,parameter :: n_p0=0.0015888279 |
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| 91 | real,parameter :: n_b=1.9628251 |
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| 92 | |
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| 93 | c Variables added to implement NLTE correction factor (feb 2011) |
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| 94 | real pyy(nlayer) |
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| 95 | real cor1(nlayer),oldoco2(nlayer),alfa2(nlayer) |
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| 96 | real p2011,cociente1,merge |
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| 97 | real cor0,oco2gcm |
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| 98 | |
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| 99 | c---------------------------------------------------------------------- |
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| 100 | |
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| 101 | c Initialisation |
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| 102 | c -------------- |
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| 103 | ! AS: OK firstcall absolute |
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| 104 | if (firstcall) then |
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| 105 | if (nircorr.eq.1) then |
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| 106 | ! we will need co2 and o tracers |
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| 107 | ico2=igcm_co2 |
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| 108 | if (ico2==0) then |
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| 109 | write(*,*) "nirco2abs error: I need a CO2 tracer" |
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| 110 | write(*,*) " when running with nircorr==1" |
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| 111 | call abort_physic("nirco2abs","need a CO2 tracer",1) |
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| 112 | endif |
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| 113 | io=igcm_o |
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| 114 | if (io==0) then |
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| 115 | write(*,*) "nirco2abs error: I need an O tracer" |
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| 116 | write(*,*) " when running with nircorr==1" |
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| 117 | call abort_physic("nirco2abs","need an O tracer",1) |
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| 118 | endif |
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| 119 | endif |
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| 120 | firstcall=.false. |
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| 121 | endif |
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| 122 | |
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| 123 | |
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| 124 | c co2heat is the heating by CO2 at 700Pa for a zero zenithal angle. |
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| 125 | co2heat0=n_a*(1.52/dist_sol)**2/daysec |
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| 126 | |
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| 127 | c Simple calcul for a given sun incident angle (if diurnal=T) |
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| 128 | c -------------------------------------------- |
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| 129 | |
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| 130 | IF (diurnal) THEN |
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| 131 | do ig=1,ngrid |
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| 132 | zmu(ig)=sqrt(1224.*mu0(ig)*mu0(ig)+1.)/35. |
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| 133 | |
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| 134 | if(nircorr.eq.1) then |
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| 135 | do l=1,nlayer |
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| 136 | pyy(l)=pplay(ig,l) |
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| 137 | enddo |
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| 138 | |
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| 139 | call interpnir(cor1,pyy,nlayer,corgcm,pres1d,npres) |
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| 140 | call interpnir(oldoco2,pyy,nlayer,oco21d,pres1d,npres) |
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| 141 | call interpnir(alfa2,pyy,nlayer,alfa,pres1d,npres) |
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| 142 | endif |
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| 143 | |
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| 144 | do l=1,nlayer |
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| 145 | ! Calculations for the O/CO2 correction |
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| 146 | if(nircorr.eq.1) then |
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| 147 | cor0=1./(1.+n_p0/pplay(ig,l))**n_b |
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| 148 | if(pq(ig,l,ico2).gt.1.e-6) then |
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| 149 | oco2gcm=pq(ig,l,io)/pq(ig,l,ico2) |
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| 150 | ! handle the rare cases when pq(ig,l,io)<0 |
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| 151 | if (pq(ig,l,io).lt.0) then |
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| 152 | write(*,*) "nirco2abs: warning ig=",ig," l=",l, |
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| 153 | & " pq(ig,l,io)=",pq(ig,l,io) |
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| 154 | oco2gcm=1.e6 |
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| 155 | endif |
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| 156 | else |
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| 157 | oco2gcm=1.e6 |
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| 158 | endif |
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| 159 | cociente1=oco2gcm/oldoco2(l) |
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| 160 | merge=alog10(cociente1)*alfa2(l)+alog10(cor0)* |
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| 161 | $ (1.-alfa2(l)) |
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| 162 | merge=10**merge |
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| 163 | p2011=sqrt(merge)*cor0 |
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| 164 | else if (nircorr.eq.0) then |
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| 165 | p2011=1. |
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| 166 | cor1(l)=1. |
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| 167 | endif |
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| 168 | |
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| 169 | if(fract(ig).gt.0.) pdtnirco2(ig,l)= |
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| 170 | & co2heat0*sqrt((700.*zmu(ig))/pplay(ig,l)) |
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| 171 | & /(1.+n_p0/pplay(ig,l))**n_b |
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| 172 | ! Corrections from tabulation |
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| 173 | $ * cor1(l) * p2011 |
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| 174 | c OLD SCHEME (forget et al. 1999) |
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| 175 | c s co2heat0*sqrt((700.*zmu(ig))/pplay(ig,l)) |
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| 176 | c s / (1+p0nonlte/pplay(ig,l)) |
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| 177 | enddo |
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| 178 | enddo |
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| 179 | |
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| 180 | |
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| 181 | c Averaging over diurnal cycle (if diurnal=F) |
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| 182 | c ------------------------------------------- |
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| 183 | c NIR CO2 abs is slightly non linear. To remove the diurnal |
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| 184 | c cycle, it is better to average the heating rate over 1 day rather |
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| 185 | c than using the mean mu0 computed by mucorr in physiq.F (FF, 1998) |
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| 186 | |
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| 187 | ELSE ! if (.not.diurnal) then |
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| 188 | |
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| 189 | nstep = 20 ! number of integration step /sol |
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| 190 | mu0_int(1:ngrid) = 0. |
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| 191 | ztim1 = 0. |
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| 192 | do n=1,nstep |
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| 193 | zday_int = (n-1)/float(nstep) |
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| 194 | ztim2=COS(declin)*COS(2.*pi*(zday_int-.5)) |
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| 195 | ztim3=-COS(declin)*SIN(2.*pi*(zday_int-.5)) |
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| 196 | CALL solang(ngrid,sinlon,coslon,sinlat,coslat, |
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| 197 | s ztim1,ztim2,ztim3, |
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| 198 | s mu0_int,fract_int) |
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| 199 | do ig=1,ngrid |
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| 200 | zmu(ig)=sqrt(1224.*mu0_int(ig)*mu0_int(ig)+1.)/35. |
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| 201 | |
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| 202 | if(nircorr.eq.1) then |
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| 203 | do l=1,nlayer |
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| 204 | pyy(l)=pplay(ig,l) |
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| 205 | enddo |
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| 206 | call interpnir(cor1,pyy,nlayer,corgcm,pres1d,npres) |
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| 207 | call interpnir(oldoco2,pyy,nlayer,oco21d,pres1d,npres) |
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| 208 | call interpnir(alfa2,pyy,nlayer,alfa,pres1d,npres) |
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| 209 | endif |
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| 210 | |
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| 211 | do l=1,nlayer |
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| 212 | if(nircorr.eq.1) then |
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| 213 | cor0=1./(1.+n_p0/pplay(ig,l))**n_b |
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| 214 | oco2gcm=pq(ig,l,io)/pq(ig,l,ico2) |
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| 215 | cociente1=oco2gcm/oldoco2(l) |
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| 216 | merge=alog10(cociente1)*alfa2(l)+alog10(cor0)* |
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| 217 | $ (1.-alfa2(l)) |
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| 218 | merge=10**merge |
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| 219 | p2011=sqrt(merge)*cor0 |
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| 220 | else if (nircorr.eq.0) then |
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| 221 | p2011=1. |
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| 222 | cor1(l)=1. |
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| 223 | endif |
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| 224 | |
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| 225 | if(fract_int(ig).gt.0.) pdtnirco2(ig,l)= |
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| 226 | & pdtnirco2(ig,l) + (1/float(nstep))* |
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| 227 | & co2heat0*sqrt((700.*zmu(ig))/pplay(ig,l)) |
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| 228 | & /(1.+n_p0/pplay(ig,l))**n_b |
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| 229 | ! Corrections from tabulation |
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| 230 | $ * cor1(l) * p2011 |
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| 231 | enddo |
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| 232 | enddo |
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| 233 | end do |
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| 234 | END IF |
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| 235 | |
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| 236 | end |
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| 237 | |
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| 238 | |
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| 239 | |
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| 240 | subroutine interpnir(escout,p,nlayer,escin,pin,nl) |
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| 241 | C |
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| 242 | C subroutine to perform linear interpolation in pressure from 1D profile |
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| 243 | C escin(nl) sampled on pressure grid pin(nl) to profile |
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| 244 | C escout(nlayer) on pressure grid p(nlayer). |
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| 245 | C |
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| 246 | real escout(nlayer),p(nlayer) |
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| 247 | real escin(nl),pin(nl),wm,wp |
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| 248 | integer nl,nlayer,n1,n,nm,np |
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| 249 | do n1=1,nlayer |
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| 250 | if(p(n1) .gt. 1500. .or. p(n1) .lt. 1.0e-13) then |
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| 251 | escout(n1) = 0.0 |
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| 252 | else |
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| 253 | do n = 1,nl-1 |
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| 254 | if (p(n1).le.pin(n).and.p(n1).ge.pin(n+1)) then |
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| 255 | nm=n |
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| 256 | np=n+1 |
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| 257 | wm=abs(pin(np)-p(n1))/(pin(nm)-pin(np)) |
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| 258 | wp=1.0 - wm |
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| 259 | endif |
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| 260 | enddo |
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| 261 | escout(n1) = escin(nm)*wm + escin(np)*wp |
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| 262 | endif |
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| 263 | enddo |
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| 264 | end |
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