1 | ! |
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2 | ! $Id: micphy_tstep.F90 4727 2023-10-19 14:02:57Z abarral $ |
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3 | ! |
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4 | SUBROUTINE micphy_tstep(pdtphys,tr_seri,t_seri,pplay,paprs,rh,is_strato) |
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5 | |
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6 | USE geometry_mod, ONLY : latitude_deg !NL- latitude corr. to local domain |
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7 | USE dimphy, ONLY : klon,klev |
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8 | USE aerophys |
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9 | USE infotrac_phy, ONLY : nbtr_bin, nbtr_sulgas, nbtr, id_H2SO4_strat |
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10 | USE phys_local_var_mod, ONLY: mdw, budg_3D_nucl, budg_3D_cond_evap, budg_h2so4_to_part, R2SO4, DENSO4, f_r_wet |
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11 | USE nucleation_tstep_mod |
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12 | USE cond_evap_tstep_mod |
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13 | USE sulfate_aer_mod, ONLY : STRAACT |
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14 | USE YOMCST, ONLY : RPI, RD, RG |
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15 | USE print_control_mod, ONLY: lunout |
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16 | USE strataer_local_var_mod |
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17 | |
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18 | IMPLICIT NONE |
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19 | |
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20 | !-------------------------------------------------------- |
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21 | |
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22 | ! transfer variables when calling this routine |
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23 | REAL,INTENT(IN) :: pdtphys ! Pas d'integration pour la physique (seconde) |
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24 | REAL,DIMENSION(klon,klev,nbtr),INTENT(INOUT) :: tr_seri ! Concentration Traceur [U/KgA] |
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25 | REAL,DIMENSION(klon,klev),INTENT(IN) :: t_seri ! Temperature |
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26 | REAL,DIMENSION(klon,klev),INTENT(IN) :: pplay ! pression pour le mileu de chaque couche (en Pa) |
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27 | REAL,DIMENSION(klon,klev+1),INTENT(IN) :: paprs ! pression pour chaque inter-couche (en Pa) |
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28 | REAL,DIMENSION(klon,klev),INTENT(IN) :: rh ! humidite relative |
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29 | LOGICAL,DIMENSION(klon,klev),INTENT(IN) :: is_strato |
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30 | |
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31 | ! local variables in coagulation routine |
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32 | INTEGER, PARAMETER :: nbtstep=4 ! Max number of time steps in microphysics per time step in physics |
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33 | INTEGER :: it,ilon,ilev,count_tstep |
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34 | REAL :: rhoa !H2SO4 number density [molecules/cm3] |
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35 | REAL :: ntot !total number of molecules in the critical cluster (ntot>4) |
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36 | REAL :: x ! molefraction of H2SO4 in the critical cluster |
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37 | REAL Vbin(nbtr_bin) |
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38 | REAL a_xm, b_xm, c_xm |
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39 | REAL PDT, dt |
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40 | REAL H2SO4_init |
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41 | REAL ACTSO4(klon,klev) |
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42 | REAL RRSI(nbtr_bin) |
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43 | REAL nucl_rate |
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44 | REAL cond_evap_rate |
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45 | REAL evap_rate |
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46 | REAL FL(nbtr_bin) |
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47 | REAL ASO4(nbtr_bin) |
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48 | REAL DNDR(nbtr_bin) |
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49 | REAL H2SO4_sat |
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50 | |
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51 | DO it=1,nbtr_bin |
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52 | Vbin(it)=4.0*RPI*((mdw(it)/2.)**3)/3.0 |
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53 | ENDDO |
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54 | |
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55 | !coefficients for H2SO4 density parametrization used for nucleation if ntot<4 |
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56 | a_xm = 0.7681724 + 1.*(2.1847140 + 1.*(7.1630022 + 1.*(-44.31447 + & |
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57 | & 1.*(88.75606 + 1.*(-75.73729 + 1.*23.43228))))) |
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58 | b_xm = 1.808225e-3 + 1.*(-9.294656e-3 + 1.*(-0.03742148 + 1.*(0.2565321 + & |
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59 | & 1.*(-0.5362872 + 1.*(0.4857736 - 1.*0.1629592))))) |
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60 | c_xm = -3.478524e-6 + 1.*(1.335867e-5 + 1.*(5.195706e-5 + 1.*(-3.717636e-4 + & |
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61 | & 1.*(7.990811e-4 + 1.*(-7.458060e-4 + 1.*2.58139e-4 ))))) |
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62 | |
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63 | ! STRAACT (R2SO4, t_seri -> H2SO4 activity coefficient (ACTSO4)) for cond/evap |
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64 | CALL STRAACT(ACTSO4) |
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65 | |
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66 | ! compute particle radius in cm RRSI from diameter in m |
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67 | DO it=1,nbtr_bin |
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68 | RRSI(it)=mdw(it)/2.*100. |
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69 | ENDDO |
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70 | |
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71 | DO ilon=1, klon |
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72 | ! |
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73 | !--initialisation of diagnostic |
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74 | budg_h2so4_to_part(ilon)=0.0 |
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75 | ! |
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76 | DO ilev=1, klev |
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77 | ! |
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78 | !--initialisation of diagnostic |
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79 | budg_3D_nucl(ilon,ilev)=0.0 |
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80 | budg_3D_cond_evap(ilon,ilev)=0.0 |
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81 | ! |
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82 | ! only in the stratosphere |
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83 | IF (is_strato(ilon,ilev)) THEN |
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84 | ! initialize sulfur fluxes |
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85 | H2SO4_init=tr_seri(ilon,ilev,id_H2SO4_strat) |
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86 | ! adaptive timestep for nucleation and condensation |
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87 | PDT=pdtphys |
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88 | count_tstep=0 |
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89 | DO WHILE (PDT>0.0) |
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90 | count_tstep=count_tstep+1 |
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91 | IF (count_tstep .GT. nbtstep) EXIT |
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92 | ! convert tr_seri(GASH2SO4) (in kg/kgA) to H2SO4 number density (in molecules/cm3) |
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93 | rhoa=tr_seri(ilon,ilev,id_H2SO4_strat) & |
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94 | & *pplay(ilon,ilev)/t_seri(ilon,ilev)/RD/1.E6/mH2SO4mol |
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95 | ! compute nucleation rate in kg(H2SO4)/kgA/s |
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96 | CALL nucleation_rate(rhoa,t_seri(ilon,ilev),pplay(ilon,ilev),rh(ilon,ilev), & |
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97 | & a_xm,b_xm,c_xm,nucl_rate,ntot,x) |
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98 | !NL - add nucleation box (if flag on) |
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99 | IF (flag_nuc_rate_box) THEN |
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100 | IF (latitude_deg(ilon).LE.nuclat_min .OR. latitude_deg(ilon).GE.nuclat_max & |
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101 | .OR. pplay(ilon,ilev).GE.nucpres_max .AND. pplay(ilon,ilev).LE.nucpres_min) THEN |
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102 | nucl_rate=0.0 |
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103 | ENDIF |
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104 | ENDIF |
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105 | ! compute cond/evap rate in kg(H2SO4)/kgA/s |
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106 | CALL condens_evapor_rate(rhoa,t_seri(ilon,ilev),pplay(ilon,ilev), & |
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107 | & ACTSO4(ilon,ilev),R2SO4(ilon,ilev),DENSO4(ilon,ilev),f_r_wet(ilon,ilev), & |
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108 | & RRSI,Vbin,FL,ASO4,DNDR) |
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109 | ! Compute H2SO4 saturate vapor for big particules |
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110 | H2SO4_sat = DNDR(nbtr_bin)/(pplay(ilon,ilev)/t_seri(ilon,ilev)/RD/1.E6/mH2SO4mol) |
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111 | ! consider only condensation (positive FL) |
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112 | DO it=1,nbtr_bin |
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113 | FL(it)=MAX(FL(it),0.) |
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114 | ENDDO |
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115 | ! compute total H2SO4 cond flux for all particles |
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116 | cond_evap_rate=0.0 |
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117 | DO it=1, nbtr_bin |
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118 | cond_evap_rate=cond_evap_rate+tr_seri(ilon,ilev,it+nbtr_sulgas)*FL(it)*mH2SO4mol |
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119 | ENDDO |
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120 | ! determine appropriate time step |
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121 | dt=(H2SO4_init-H2SO4_sat)/float(nbtstep)/MAX(1.e-30, nucl_rate+cond_evap_rate) !cond_evap_rate pos. for cond. and neg. for evap. |
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122 | IF (dt.LT.0.0) THEN |
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123 | dt=PDT |
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124 | ENDIF |
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125 | dt=MIN(dt,PDT) |
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126 | ! update H2SO4 concentration |
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127 | tr_seri(ilon,ilev,id_H2SO4_strat)=MAX(0.,tr_seri(ilon,ilev,id_H2SO4_strat)-(nucl_rate+cond_evap_rate)*dt) |
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128 | ! apply cond to bins |
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129 | CALL cond_evap_part(dt,FL,ASO4,f_r_wet(ilon,ilev),RRSI,Vbin,tr_seri(ilon,ilev,:)) |
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130 | ! apply nucl. to bins |
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131 | CALL nucleation_part(nucl_rate,ntot,x,dt,Vbin,tr_seri(ilon,ilev,:)) |
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132 | ! compute fluxes as diagnostic in [kg(S)/m2/layer/s] (now - for evap and + for cond) |
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133 | budg_3D_cond_evap(ilon,ilev)=budg_3D_cond_evap(ilon,ilev)+mSatom/mH2SO4mol & |
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134 | & *cond_evap_rate*(paprs(ilon,ilev)-paprs(ilon,ilev+1))/RG*dt/pdtphys |
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135 | budg_3D_nucl(ilon,ilev)=budg_3D_nucl(ilon,ilev)+mSatom/mH2SO4mol & |
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136 | & *nucl_rate*(paprs(ilon,ilev)-paprs(ilon,ilev+1))/RG*dt/pdtphys |
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137 | ! update time step |
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138 | PDT=PDT-dt |
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139 | ENDDO |
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140 | ! convert tr_seri(GASH2SO4) (in kg/kgA) to H2SO4 number density (in molecules/cm3) |
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141 | rhoa=tr_seri(ilon,ilev,id_H2SO4_strat) & |
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142 | & *pplay(ilon,ilev)/t_seri(ilon,ilev)/RD/1.E6/mH2SO4mol |
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143 | ! compute cond/evap rate in kg(H2SO4)/kgA/s (now only evap for pdtphys) |
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144 | CALL condens_evapor_rate(rhoa,t_seri(ilon,ilev),pplay(ilon,ilev), & |
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145 | & ACTSO4(ilon,ilev),R2SO4(ilon,ilev),DENSO4(ilon,ilev),f_r_wet(ilon,ilev), & |
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146 | & RRSI,Vbin,FL,ASO4,DNDR) |
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147 | ! limit evaporation (negative FL) over one physics time step to H2SO4 content of the droplet |
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148 | DO it=1,nbtr_bin |
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149 | FL(it)=MAX(FL(it)*pdtphys,0.-ASO4(it))/pdtphys |
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150 | ! consider only evap (negative FL) |
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151 | FL(it)=MIN(FL(it),0.) |
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152 | ENDDO |
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153 | ! compute total H2SO4 evap flux for all particles |
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154 | evap_rate=0.0 |
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155 | DO it=1, nbtr_bin |
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156 | evap_rate=evap_rate+tr_seri(ilon,ilev,it+nbtr_sulgas)*FL(it)*mH2SO4mol |
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157 | ENDDO |
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158 | ! update H2SO4 concentration after evap |
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159 | tr_seri(ilon,ilev,id_H2SO4_strat)=MAX(0.,tr_seri(ilon,ilev,id_H2SO4_strat)-evap_rate*pdtphys) |
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160 | ! apply evap to bins |
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161 | CALL cond_evap_part(pdtphys,FL,ASO4,f_r_wet(ilon,ilev),RRSI,Vbin,tr_seri(ilon,ilev,:)) |
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162 | ! compute fluxes as diagnostic in [kg(S)/m2/layer/s] (now - for evap and + for cond) |
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163 | budg_3D_cond_evap(ilon,ilev)=budg_3D_cond_evap(ilon,ilev)+mSatom/mH2SO4mol & |
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164 | & *evap_rate*(paprs(ilon,ilev)-paprs(ilon,ilev+1))/RG |
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165 | ! compute vertically integrated flux due to the net effect of nucleation and condensation/evaporation |
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166 | budg_h2so4_to_part(ilon)=budg_h2so4_to_part(ilon)+(H2SO4_init-tr_seri(ilon,ilev,id_H2SO4_strat)) & |
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167 | & *mSatom/mH2SO4mol*(paprs(ilon,ilev)-paprs(ilon,ilev+1))/RG/pdtphys |
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168 | ENDIF |
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169 | ENDDO |
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170 | ENDDO |
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171 | |
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172 | IF (MINVAL(tr_seri).LT.0.0) THEN |
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173 | DO ilon=1, klon |
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174 | DO ilev=1, klev |
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175 | DO it=1, nbtr |
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176 | IF (tr_seri(ilon,ilev,it).LT.0.0) THEN |
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177 | WRITE(lunout,*) 'micphy_tstep: negative concentration', tr_seri(ilon,ilev,it), ilon, ilev, it |
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178 | ENDIF |
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179 | ENDDO |
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180 | ENDDO |
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181 | ENDDO |
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182 | ENDIF |
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183 | |
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184 | END SUBROUTINE micphy_tstep |
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