Changeset 3149 for trunk/LMDZ.COMMON/libf/evolution/constants_marspem_mod.F90

Timestamp:

Dec 6, 2023, 4:02:06 PM (12 months ago)

Author:

jbclement

Message:

PEM:

• Simplification of the algorithm managing the stopping criteria;
• Complete rework of the ice management in the PEM (H2O & CO2);

  Subroutines to evolve the H2O and CO2 ice are now in the same module "evol_ice_mod.F90".
  Tendencies are computed from the variation of "ice + frost" between the 2 PCM runs.
  Evolving ice in the PEM is now called 'h2o_ice' or 'co2_ice' (not anymore in 'qsurf' and free of 'water_reservoir').
  Default value 'ini_h2o_bigreservoir' (= 10 m) initializes the H2O ice of the first PEM run where there is 'watercap'. For the next PEM runs, initialization is done with the value kept in "startpem.nc". CO2 ice is taken from 'perennial_co2ice' of the PCM (paleoclimate flag must be true).
  Simplification of the condition to compute the surface ice cover needed for the stopping criteria.
  Frost ('qsurf') is not evolved by the PEM and given back to the PCM.
  New default threshold value 'inf_h2oice_threshold' (= 2 m) to decide at the end of the PEM run if the H2O ice should be 'watercap' or not for the next PCM runs. If H2O ice cannot be 'watercap', then the remaining H2O ice is transferred to the frost ('qsurf').
  

• Renaming of variables/subroutines for clarity;
• Some cleanings throughout the code;
• Small updates in files of the deftank.

JBC

File:

• trunk/LMDZ.COMMON/libf/evolution/constants_marspem_mod.F90 (modified) (1 diff)

trunk/LMDZ.COMMON/libf/evolution/constants_marspem_mod.F90

@@ -12 +12 @@
 real, parameter :: m_h2o = 18.01528e-3 ! Molecular weight of h2o (kg/mol)
 
-!     Coefficient for Clapeyron law for CO2 condensation temperature (Tco2 = beta/(alpha-log(vmr)),following James et al. 1992
+! Coefficient for Clapeyron law for CO2 condensation temperature (Tco2 = beta/(alpha-log(vmr)),following James et al. 1992
 real, parameter :: alpha_clap_co2 = 23.3494 ! Uniteless, James et al. 1992
 real, parameter :: beta_clap_co2 = 3182.48  ! Kelvin, James et al. 1992
 
-!     Coefficient for Clapeyron law for psat (psat = exp(beta/Th2o+alpha)),following Murphy and Koop 2005
+! Coefficient for Clapeyron law for psat (psat = exp(beta/Th2o+alpha)),following Murphy and Koop 2005
 real, parameter :: alpha_clap_h2o = 28.9074 ! Uniteless, Murphy and Koop 2005
 real, parameter :: beta_clap_h2o = -6143.7  ! Kelvin, Murphy and Koop 2005
 
-!     Density of the regolith (Zent et al., 1995, Buhler and Piqueux 2021)     
+! Density of the regolith (Zent et al., 1995, Buhler and Piqueux 2021)     
 real, parameter :: rho_regolith = 2000. ! kg/m^3
 
-!     Average  Thermal inertia of the surface, breccia, bedrock, following Mellon et al., 2000., Wood et al., 2008
+! Average thermal inertia of the surface, breccia, bedrock, following Mellon et al., 2000., Wood et al., 2008
 real, parameter :: TI_regolith_avg = 250. ! Averaged of the observed thermal inertia for regolith following Mellon et al., 2000[SI]
 real, parameter :: TI_breccia = 750.      ! Thermal inertia of Breccia following Wood 2009 [SI]
 real, parameter :: TI_bedrock = 2300.     ! Thermal inertia of Bedrock following Wood 2009 [SI]
 
-!     Porosity of the soil
+! Porosity of the soil
 real, parameter :: porosity = 0.4 ! porosity of the martian soil, correspond to the value for a random loose packing of monodiperse sphere (Scott, 1960)
 
-!     Stefan Boltzmann constant
+! Stefan Boltzmann constant
 real, parameter :: sigmaB = 5.678e-8 
 
-!     Latent heat of CO2
+! Latent heat of CO2
 real, parameter :: Lco2 =  5.71e5 ! Pilorget and Forget 2016
 
-! Conversion H2O/CO2 frost to perennial frost and vice versa
-real, parameter :: threshold_h2o_frost2perennial = 1000.  !~ 1 m
-real, parameter :: threshold_co2_frost2perennial = 16000. !~ 10 m
+! Threshold to consider the amount of H2O ice as an infinite reservoir
+real, parameter :: inf_h2oice_threshold = 2000.  !~ 1 m
 
 END MODULE constants_marspem_mod