| [2312] | 1 | MODULE hdo_surfex_mod |
|---|
| 2 | |
|---|
| 3 | IMPLICIT NONE |
|---|
| 4 | |
|---|
| 5 | CONTAINS |
|---|
| 6 | |
|---|
| 7 | subroutine hdo_surfex(ngrid,nlay,nq,ptimestep, |
|---|
| 8 | & zt,zq,pqsurf, |
|---|
| [2316] | 9 | & old_h2o_vap,pdqsdif,dwatercap_dif, |
|---|
| [2312] | 10 | & hdoflux) |
|---|
| 11 | |
|---|
| 12 | use tracer_mod, only: igcm_h2o_vap, igcm_h2o_ice, |
|---|
| [2324] | 13 | & igcm_hdo_vap, igcm_hdo_ice, |
|---|
| 14 | & qperemin |
|---|
| [2312] | 15 | use surfdat_h, only: watercaptag |
|---|
| 16 | use geometry_mod, only: longitude_deg,latitude_deg |
|---|
| 17 | |
|---|
| 18 | implicit none |
|---|
| 19 | c------------------------------------------------------------------ |
|---|
| 20 | c Routine to compute the fluxes between air and surface |
|---|
| 21 | c for HDO, based of the fluxes for H2O |
|---|
| 22 | c L. Rossi.; M. Vals 2019 |
|---|
| 23 | c------------------------------------------------------------------ |
|---|
| 24 | include "callkeys.h" |
|---|
| 25 | |
|---|
| 26 | c------------------------------------------------------------------ |
|---|
| 27 | c Arguments: |
|---|
| 28 | c --------- |
|---|
| 29 | c Inputs: |
|---|
| 30 | INTEGER, INTENT(IN) :: ngrid,nlay |
|---|
| 31 | INTEGER, INTENT(IN) :: nq ! nombre de traceurs |
|---|
| 32 | |
|---|
| 33 | REAL, INTENT(IN) :: ptimestep ! pas de temps physique (s) |
|---|
| 34 | REAL, INTENT(IN) :: zt(ngrid,nlay) ! local value of temperature |
|---|
| 35 | REAL, INTENT(IN) :: zq(ngrid,nlay,nq) ! local value of tracers |
|---|
| 36 | REAL, INTENT(IN) :: pqsurf(ngrid,nq) |
|---|
| 37 | REAL, INTENT(IN) :: old_h2o_vap(ngrid) ! traceur d'eau avant |
|---|
| 38 | !traitement de l'eau (kg/kg) |
|---|
| [2316] | 39 | REAL, INTENT(IN) :: dwatercap_dif(ngrid) ! trend related to permanent ice |
|---|
| [2312] | 40 | REAL, INTENT(INOUT) :: pdqsdif(ngrid,nq) ! tendance towards surface |
|---|
| 41 | ! (kg/kg.s-1) |
|---|
| 42 | |
|---|
| 43 | c Output: |
|---|
| 44 | REAL, INTENT(OUT) :: hdoflux(ngrid) ! value of vapour flux of HDO |
|---|
| 45 | |
|---|
| 46 | c------------------------------------------------------------------ |
|---|
| 47 | c Local variables: |
|---|
| 48 | |
|---|
| 49 | REAL alpha_c(ngrid) ! fractionation factor |
|---|
| 50 | REAL extrasublim ! sublimation in excess of surface ice |
|---|
| 51 | REAL tmpratio(ngrid) ! D/H ratio in flux to surf |
|---|
| [2316] | 52 | REAL h2oflux(ngrid) ! value of vapour flux of H2O |
|---|
| 53 | ! same sign as pdqsdif |
|---|
| [2312] | 54 | |
|---|
| 55 | INTEGER ig,l |
|---|
| 56 | |
|---|
| 57 | REAL DoH_vap(ngrid) |
|---|
| 58 | |
|---|
| 59 | c----------------------------------------------------------------------- |
|---|
| 60 | c Calculation of the fluxes for HDO |
|---|
| 61 | |
|---|
| 62 | alpha_c(1:ngrid)=0. |
|---|
| 63 | |
|---|
| 64 | DO ig=1,ngrid |
|---|
| [2316] | 65 | |
|---|
| 66 | h2oflux(ig) = pdqsdif(ig,igcm_h2o_ice) + |
|---|
| 67 | & dwatercap_dif(ig) |
|---|
| [2312] | 68 | |
|---|
| 69 | !! IF Sublimation |
|---|
| 70 | if (h2oflux(ig).le.0.) then |
|---|
| 71 | |
|---|
| [2324] | 72 | if (pqsurf(ig,igcm_h2o_ice).gt.qperemin) then |
|---|
| [2312] | 73 | pdqsdif(ig,igcm_hdo_ice) = |
|---|
| 74 | & pdqsdif(ig,igcm_h2o_ice)* |
|---|
| 75 | & (pqsurf(ig,igcm_hdo_ice)/ |
|---|
| 76 | & pqsurf(ig,igcm_h2o_ice) ) |
|---|
| 77 | else |
|---|
| 78 | pdqsdif(ig,igcm_hdo_ice) = 0. |
|---|
| 79 | endif |
|---|
| 80 | |
|---|
| 81 | pdqsdif(ig,igcm_hdo_ice)= |
|---|
| 82 | & max(pdqsdif(ig,igcm_hdo_ice), |
|---|
| 83 | & -pqsurf(ig,igcm_hdo_ice)/ptimestep) |
|---|
| 84 | |
|---|
| 85 | hdoflux(ig) = pdqsdif(ig,igcm_hdo_ice) |
|---|
| 86 | |
|---|
| 87 | if(watercaptag(ig)) then |
|---|
| 88 | |
|---|
| 89 | !if we sublimate more than qsurf |
|---|
| 90 | if ((-h2oflux(ig)*ptimestep) |
|---|
| 91 | & .gt.pqsurf(ig,igcm_h2o_ice)) then |
|---|
| 92 | |
|---|
| [2316] | 93 | C dwatercap_dif is how much we sublimate in excess of |
|---|
| [2312] | 94 | C pqsurf for H2O |
|---|
| 95 | C hdoflux(ig) is the flux of HDO from atm. to surf. |
|---|
| 96 | c The D/H of the old ice is supposed to be 5 SMOW |
|---|
| 97 | c We need D/H of the flux to be 5, so we need |
|---|
| [2316] | 98 | c dwatercap_dif* 5 * 2 * 155.76e-6 (=1 SMOW) |
|---|
| [2312] | 99 | hdoflux(ig)= hdoflux(ig) |
|---|
| [2316] | 100 | & +(dwatercap_dif(ig)*(2.*155.76e-6)*5.) |
|---|
| 101 | endif |
|---|
| 102 | endif ! watercap |
|---|
| [2312] | 103 | |
|---|
| 104 | else ! condensation |
|---|
| 105 | |
|---|
| 106 | if (hdofrac) then !do we use fractionation? |
|---|
| [2378] | 107 | c alpha_c(ig) = exp(16288./zt(ig,1)**2.-9.34e-2) |
|---|
| 108 | alpha_c = exp(13525./zt(ig,1)**2.-5.59e-2) !Lamb |
|---|
| [2312] | 109 | else |
|---|
| 110 | alpha_c(ig) = 1. |
|---|
| 111 | endif |
|---|
| 112 | |
|---|
| [2324] | 113 | if (old_h2o_vap(ig).gt.qperemin) then |
|---|
| [2312] | 114 | pdqsdif(ig,igcm_hdo_ice)= |
|---|
| 115 | & alpha_c(ig)*pdqsdif(ig,igcm_h2o_ice)* |
|---|
| 116 | & (zq(ig,1,igcm_hdo_vap)/ |
|---|
| 117 | & old_h2o_vap(ig)) |
|---|
| 118 | else |
|---|
| 119 | pdqsdif(ig,igcm_hdo_ice)= 0. |
|---|
| 120 | endif |
|---|
| 121 | |
|---|
| 122 | if (hdofrac) then !do we use fractionation? |
|---|
| 123 | pdqsdif(ig,igcm_hdo_ice)= |
|---|
| 124 | & min( pdqsdif(ig,igcm_hdo_ice), |
|---|
| 125 | & (zq(ig,1,igcm_hdo_vap)/ptimestep) ) |
|---|
| 126 | endif |
|---|
| 127 | |
|---|
| 128 | hdoflux(ig)=pdqsdif(ig,igcm_hdo_ice) |
|---|
| 129 | |
|---|
| 130 | endif !sublimation |
|---|
| 131 | |
|---|
| 132 | ENDDO ! of DO ig=1,ngrid |
|---|
| 133 | |
|---|
| 134 | c CALL WRITEDIAGFI(ngrid,'extrasublim', |
|---|
| 135 | c & 'extrasublimation', |
|---|
| 136 | c & ' ',2,tmpratio) |
|---|
| 137 | c CALL WRITEDIAGFI(ngrid,'alpha_c_s', |
|---|
| 138 | c & 'alpha_c_s', |
|---|
| 139 | c & ' ',2,alpha_c) |
|---|
| 140 | |
|---|
| 141 | return |
|---|
| 142 | end subroutine hdo_surfex |
|---|
| 143 | c------------------------------------------------------------------ |
|---|
| 144 | |
|---|
| 145 | end module hdo_surfex_mod |
|---|
