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Streel: First iteration of the microphysical page for Venus PCM

2026-01-08T01:46:51Z

First iteration of the microphysical page for Venus PCM

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<pre style="color: red"> ! This is a work in progress to describe the microphysical scheme used in the Venus PCM ! </pre>

== 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. <font color="red"> ! Be careful it is intended for 1D for now, you can expect a lot of data in 3D (to be improved) ! </font>

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 <font color="red">! You need to add it at the end of the traceurs list (Until the rework of the traceurs in the Venus PCM) !</font>

<pre>
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
</pre>

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Venus PCM - Microphysical scheme - Revision history

Streel: Add categories

Streel: First iteration of the microphysical page for Venus PCM