Dear everybody, Sorry for all my questions these last days, I have two projects with Qpack and I have to deal with both of them at the same time.
I am reviewing an article using Qpack but the reviewer asks me to simultaneously retrieve the liquid water path (LWP) with the temperature. I would like to modify the routine oem.m of Qpack to minimize the cost function with respect to the liquid water path and not the liquid water content profile. I have some ideas in mind: when I am in the oem.m routine like: 1) Modify the B matrix to only have one value for LWP instead of background errors for the whole liquid water content profile 2) After the computation of the Jacobians for the liquid water content profile, change it to only have one value of Jacobians (delta TB with respect to LWP) 3) after finding the xstep that minimizes the cost function, go back from the LWP increment to an increment on the whole liquid water content profile. Then, the new x profile is found, no modification for the convergence test should be done. I do not know if it is more complicated then that as I do not know well how the whole Qpack is coded, I mainly know this oem.m routine. Does anyone have ever done such a modification ? If not, does anyone could help me doing it alone ? and do you think it would take a lot of time. I only have 4 weeks to send back my reviews. If it sounds too complicated, I will try to explain to the reviewer this is not possible with the current version of Qpack. Thank you very much in advance ! Best regards, Pauline ----- Météo-France ----- Dr. Pauline Martinet Chercheur CNRM/GMEI/LISA [email protected] Fixe : +33 561079031 Site web: www.sites.google.com/site/martinetpauline31
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