Thanks Patrick for the clarification,

I saw one of the Atmlab scattering demo examples which uses IWP as an input, 
which later is converted to PND (Partcile Number Density) before calling ARTS.

I am still trying to use Atmlab for scattering calculations with particle size 
distributions with a cloud box, due to the ease of using Matlab.

Do  you recommend a better way? like PyARTS or using ARTS by itself for 
scattering calculations?

Renish Thomas

From: Patrick Eriksson <>
Sent: Tuesday, August 11, 2020 8:29 AM
To: Thomas,Renish <>; <>
Subject: Re: [arts-users] IWP in ARTS

Dear Renish,

ARTS does not take IWP, TWP etc as input. You need to specify e.g. IWC,
LWC, humidity ...

And the specification of the atmospheric profiles is independent of the
observation geometry. You specify the profiles as a function of pressure.

Not clear how you are running ARTS by Atmlab. Please note that qarts
(and qpack even less) is mainly for calculations without scattering. You
can do scattering calculations but then you really need to know how ARTS
is working.



On 2020-08-10 22:22, Thomas,Renish wrote:
> Hi All,
> I had a question about how ARTS treats integrated water path ( IWP ).
> *My simulation setup*:
> I am trying to sense a cloud box , with the sensor looking forward. (i.e
> elevation 0 degrees). I am using ARTS with Atmlab.
> *My questions:*
> *a). *How to calculate IWP/LWP (which is an input for ARTS) for the case
> of horizontal sounding of an extended cloud. Or how to use droplet
> density as an input instead of IWP.
> *b). *Can i give IWP as an input for all elevations?  Does the radiative
> transfer calculations in these cases behave properly for off zenith and
> off nadir look angles.
> As i believe  LWP = TPW for the case of nadir-zenith sensing of an
> entire atmosphere.
> *LWP*(Liquid Water Path)
> *TPW*(Total Precipitable Water)
> Cheers,
> Renish
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