Hi everybody, 

I run a liquid water content (LWC) retrieval from Qpack and I output the 
Jacobians. 

Does anyone what is the default perturbation value in the LWC profile used to 
compute the Jacobians ? 

I do not see anywhere in my control file where I define such a value but I 
manage to output the Jacobians (in the L2 structure). 

I also output the Jacobians by running a Qpack retrieval but I am only 
interested in the Jacobians of the initial profile (first iteration). Thus I do 
not really want to run a retrieval. 

Is there any way to output the Jacobians without running a retrieval only by 
calling ARTS ? (like calling arts_y(Q) to output brightness temperatures). 

Thank you very much for your help, 

Best regards, 

Pauline 

----- Météo-France ----- 
Dr. Pauline Martinet 
Chercheur CNRM/GMEI/LISA 
[email protected] 
Fixe : +33 561079031 

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