Clear-sky Rayleigh multiple scattering calculations

[Andrew Prata]

Hi

I’m testing out the RadSim package as I would like to use it for atmospheric correction. I read in the RTTOV user guide that it’s possible to perform clear-sky Rayleigh multiple scattering calculations by setting the input cloud or aerosol concentrations to zero.

I just wondered how this is done in the RadSim namelist driver file?

My understanding is that I would need to do something like:
1) Set dom_rayleigh = .true.
2) Set ir_addclouds = .true.
3) Use an ECMWF file that includes: Specific liquid water content (qcl), Specific ice content (qcf) and Area cloud fraction but then set the values of these variables to zero(?).

Is there a simple way to switch on the DOM solver and set cloud/aerosol concentrations to zero? (i.e. without having to specify the ECMWF variables in (3).

Thanks
Andrew

[James Hocking]

Hi Andrew,

There is no simple way to do this in RadSim without making some code changes because the DOM scattering solver can only be activated with clouds/aerosols in RadSim.

If you want to be able to do this via RadSim, please open a help desk ticket indicating which RadSim version you are using, and I will discuss further with you, and will be able to provide code updates to enable this.

Best wishes,
James

[Andrew Prata]

Hi James

Thank you for the fast response. I will proceed with the help desk ticket.

Cheers
Andrew

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