| 1 | MODULE hdo_surfex_mod |
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| 2 | |
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| 3 | IMPLICIT NONE |
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| 4 | |
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| 5 | CONTAINS |
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| 6 | |
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| 7 | subroutine hdo_surfex(ngrid,nlay,nq,ptimestep, |
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| 8 | & zt,zq,pqsurf, |
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| 9 | & old_h2o_vap,pdqsdif,dwatercap_dif, |
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| 10 | & hdoflux) |
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| 11 | |
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| 12 | use tracer_mod, only: igcm_h2o_vap, igcm_h2o_ice, |
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| 13 | & igcm_hdo_vap, igcm_hdo_ice, |
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| 14 | & qperemin |
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| 15 | use surfdat_h, only: watercaptag |
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| 16 | use geometry_mod, only: longitude_deg,latitude_deg |
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| 17 | |
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| 18 | implicit none |
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| 19 | c------------------------------------------------------------------ |
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| 20 | c Routine to compute the fluxes between air and surface |
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| 21 | c for HDO, based of the fluxes for H2O |
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| 22 | c L. Rossi.; M. Vals 2019 |
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| 23 | c------------------------------------------------------------------ |
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| 24 | include "callkeys.h" |
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| 25 | |
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| 26 | c------------------------------------------------------------------ |
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| 27 | c Arguments: |
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| 28 | c --------- |
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| 29 | c Inputs: |
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| 30 | INTEGER, INTENT(IN) :: ngrid,nlay |
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| 31 | INTEGER, INTENT(IN) :: nq ! nombre de traceurs |
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| 32 | |
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| 33 | REAL, INTENT(IN) :: ptimestep ! pas de temps physique (s) |
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| 34 | REAL, INTENT(IN) :: zt(ngrid,nlay) ! local value of temperature |
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| 35 | REAL, INTENT(IN) :: zq(ngrid,nlay,nq) ! local value of tracers |
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| 36 | REAL, INTENT(IN) :: pqsurf(ngrid,nq) |
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| 37 | REAL, INTENT(IN) :: old_h2o_vap(ngrid) ! traceur d'eau avant |
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| 38 | !traitement de l'eau (kg/kg) |
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| 39 | REAL, INTENT(IN) :: dwatercap_dif(ngrid) ! trend related to permanent ice |
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| 40 | REAL, INTENT(INOUT) :: pdqsdif(ngrid,nq) ! tendance towards surface |
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| 41 | ! (kg/kg.s-1) |
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| 42 | |
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| 43 | c Output: |
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| 44 | REAL, INTENT(OUT) :: hdoflux(ngrid) ! value of vapour flux of HDO |
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| 45 | |
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| 46 | c------------------------------------------------------------------ |
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| 47 | c Local variables: |
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| 48 | |
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| 49 | REAL alpha_c(ngrid) ! fractionation factor |
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| 50 | REAL extrasublim ! sublimation in excess of surface ice |
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| 51 | REAL tmpratio(ngrid) ! D/H ratio in flux to surf |
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| 52 | REAL h2oflux(ngrid) ! value of vapour flux of H2O |
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| 53 | ! same sign as pdqsdif |
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| 54 | |
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| 55 | INTEGER ig,l |
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| 56 | |
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| 57 | REAL DoH_vap(ngrid) |
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| 58 | |
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| 59 | c----------------------------------------------------------------------- |
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| 60 | c Calculation of the fluxes for HDO |
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| 61 | |
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| 62 | alpha_c(1:ngrid)=0. |
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| 63 | |
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| 64 | DO ig=1,ngrid |
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| 65 | |
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| 66 | h2oflux(ig) = pdqsdif(ig,igcm_h2o_ice) + |
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| 67 | & dwatercap_dif(ig) |
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| 68 | |
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| 69 | !! IF Sublimation |
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| 70 | if (h2oflux(ig).le.0.) then |
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| 71 | |
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| 72 | if (pqsurf(ig,igcm_h2o_ice).gt.qperemin) then |
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| 73 | pdqsdif(ig,igcm_hdo_ice) = |
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| 74 | & pdqsdif(ig,igcm_h2o_ice)* |
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| 75 | & (pqsurf(ig,igcm_hdo_ice)/ |
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| 76 | & pqsurf(ig,igcm_h2o_ice) ) |
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| 77 | else |
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| 78 | pdqsdif(ig,igcm_hdo_ice) = 0. |
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| 79 | endif |
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| 80 | |
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| 81 | pdqsdif(ig,igcm_hdo_ice)= |
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| 82 | & max(pdqsdif(ig,igcm_hdo_ice), |
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| 83 | & -pqsurf(ig,igcm_hdo_ice)/ptimestep) |
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| 84 | |
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| 85 | hdoflux(ig) = pdqsdif(ig,igcm_hdo_ice) |
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| 86 | |
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| 87 | if(watercaptag(ig)) then |
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| 88 | |
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| 89 | !if we sublimate more than qsurf |
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| 90 | if ((-h2oflux(ig)*ptimestep) |
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| 91 | & .gt.pqsurf(ig,igcm_h2o_ice)) then |
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| 92 | |
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| 93 | C dwatercap_dif is how much we sublimate in excess of |
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| 94 | C pqsurf for H2O |
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| 95 | C hdoflux(ig) is the flux of HDO from atm. to surf. |
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| 96 | c The D/H of the old ice is supposed to be 5 SMOW |
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| 97 | c We need D/H of the flux to be 5, so we need |
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| 98 | c dwatercap_dif* 5 * 2 * 155.76e-6 (=1 SMOW) |
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| 99 | hdoflux(ig)= hdoflux(ig) |
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| 100 | & +(dwatercap_dif(ig)*(2.*155.76e-6)*5.) |
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| 101 | endif |
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| 102 | endif ! watercap |
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| 103 | |
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| 104 | else ! condensation |
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| 105 | |
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| 106 | if (hdofrac) then !do we use fractionation? |
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| 107 | c alpha_c(ig) = exp(16288./zt(ig,1)**2.-9.34e-2) |
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| 108 | alpha_c = exp(13525./zt(ig,1)**2.-5.59e-2) !Lamb |
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| 109 | else |
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| 110 | alpha_c(ig) = 1. |
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| 111 | endif |
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| 112 | |
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| 113 | if (old_h2o_vap(ig).gt.qperemin) then |
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| 114 | pdqsdif(ig,igcm_hdo_ice)= |
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| 115 | & alpha_c(ig)*pdqsdif(ig,igcm_h2o_ice)* |
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| 116 | & (zq(ig,1,igcm_hdo_vap)/ |
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| 117 | & old_h2o_vap(ig)) |
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| 118 | else |
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| 119 | pdqsdif(ig,igcm_hdo_ice)= 0. |
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| 120 | endif |
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| 121 | |
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| 122 | if (hdofrac) then !do we use fractionation? |
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| 123 | pdqsdif(ig,igcm_hdo_ice)= |
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| 124 | & min( pdqsdif(ig,igcm_hdo_ice), |
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| 125 | & (zq(ig,1,igcm_hdo_vap)/ptimestep) ) |
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| 126 | endif |
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| 127 | |
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| 128 | hdoflux(ig)=pdqsdif(ig,igcm_hdo_ice) |
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| 129 | |
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| 130 | endif !sublimation |
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| 131 | |
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| 132 | ENDDO ! of DO ig=1,ngrid |
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| 133 | |
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| 134 | c CALL WRITEDIAGFI(ngrid,'extrasublim', |
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| 135 | c & 'extrasublimation', |
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| 136 | c & ' ',2,tmpratio) |
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| 137 | c CALL WRITEDIAGFI(ngrid,'alpha_c_s', |
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| 138 | c & 'alpha_c_s', |
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| 139 | c & ' ',2,alpha_c) |
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| 140 | |
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| 141 | return |
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| 142 | end subroutine hdo_surfex |
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| 143 | c------------------------------------------------------------------ |
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| 144 | |
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| 145 | end module hdo_surfex_mod |
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