[RegCNET] Dust Optical Properties

[Solmon Fabien]

Dear Netsanet

Basically the optical properties have to be calculated off line using a
Mie code.
You need to calculate optical properties knowing the effective radius of
your bin ( or an explicitly a sub-bin distribution) and for for every
spectral band of the model ( checkout mod_rad_radiation ( wavmin,
wavmax) . Given the non linearity of Mie calculation, you might want to
consider integrating and averaging the optical properties over the
spectral bands ( actually you also integaret over the sub-bin size if
you know a sub-bin distribution ) . Then you need basically to add this
information to the table in mod_rad_aerosol which gives the values of
kext,ssa,g . However I am surprised that your  code did not crash ,
because excceeding array range in mod_rad_aer... do not forget to enable
the debug option : ./configure --enable debug when you are developping
new pieces of code to track such potential bugs..
I hope it helps !

Fabien


On 03/06/2014 02:51 AM, Mirkana Degenie wrote:
> Dear all
>
> I have recently modified RegCM dust module to run for five bins. I
> have added a fifth bin(20-60um). But I haven't made change for the
> optical properties(ssa and extinction). I got emission in the fifth
> bin.  I am not sure if it is doing right because data for optical
> properties is given four 4 dust bins, so why the model runs when I add
> a fifth bin(but no ssa and extinction values for this bin).
>  And also can you please suggest me how I can get(calculate) ssa and
> extinction for dust.
>
> best regards,
>
> Netsanet
>
>
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> RegCNET at lists.ictp.it
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Fabien Solmon
Research Scientist
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