Venus PCM - Microphysical scheme
! This is a work in progress to describe the microphysical scheme used in the Venus PCM !
How to activate the microphysical scheme
In the physiq.def file
In the physiq.def file, you need to modify the flag :
cl_scheme = 1 to cl_scheme = 2
A new set of flags are now useful to you :
debug_cloud = n -> get you a full set of information on what is happening in the microphysical scheme. ! Be careful it is intended for 1D for now, you can expect a lot of data in 3D (to be improved) !
A set of flags to activate or not the individual processes of the microphysical scheme
mode_merging = y
hom_nuclea = y
het_nuclea = y
cond_evap =y
coag = y
You are able to modify the standard deviation of the size distribution of the mode 1 and mode 2 droplets
sigma_mode1 = 1.56
sigma_mode2 = 1.29
Finally you have a set of flags and free parameters to change of the aerosols production (which serves as possible condensation nuclei for the droplets)
First concerning the properties of the aerosols
prod_aer = y If you want to include the aerosols or not
rad_aer = 0.125e-6 (m) The mean radius of the aerosols produced
sigma_aer = 1.56 The standard deviation of the size distribution of the aerosols
rho_aer = 1800 (kg/m3) The density of the aerosols
And then concerning the spatial distribution of the aerosols production. We're making the assumption that the vertical production follows a gaussian shape.
alt_aer = 62000 (m) Altitude of the peak of production of the aerosols
sigmaz_aer = 2000 (m) Vertical standard deviation of the gaussian distribution
tx_prod_aer = 2.D-10 (/m2/s) Vertically integrated production rate of the aerosols
In the traceurs.def file
You need to add a set of new traceurs ! You need to add it at the end of the traceurs list (Until the rework of the traceurs in the Venus PCM) !
10 10 m0_aer 10 10 m3_aer 10 10 m0_mode1drop 10 10 m0_mode1ccn 10 10 m3_mode1sa 10 10 m3_mode1wv 10 10 m3_mode1ccn 10 10 m0_mode2drop 10 10 m0_mode2ccn 10 10 m3_mode2sa 10 10 m3_mode2wv 10 10 m3_mode2ccn
