[RegCNET] Cloud Optical Thickness (RegCM4)

[Solmon Fabien]

Hi Thanos

The cloud optical thickness is actually calculated in the model from LWP
and optical properties depending on radius. I thik Rita even put a
disgnostic to have it in the output ( it might be spectral and for each
vertical layer  , so you need to sum up vertically and select spectral
interval 8 for visible for example .. for details on OT calculation 
check out the variable tauxcl and tauxci in radccsw routine
mod_rad_radiation.F90 , which are the layer COT  for liquid and ice
water and for every spectral interval ( visible is ns =8) 
fabien

On 07/03/2014 11:07 AM, Athanasios Tsikerdekis wrote:
> Dear regcneters
> Has anybody tried to calculate cloud optical thickness from the RegCM
> output?
> Practically there is an approximate simplistic relation between the
> effective radius (Re), the liquid water path (LWP) and the cloud
> optical thickness (COT)
> COT= (3/2)(LWP/Re)
> However in the RegCM output list there is information only for the LWP
> but not for the Re which varies with the cloud type.
> I look forward for any hint on this topic.
> Best wishes
> Thanos
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