Hi Pauline, Relative humidity (RH) is not supported in qpack and arts. What documentation indicates the opposite?
One reason for not supporting RH, is that this would give a link between humidity unit and temperature jacobians. If the state variable for water vapour is RH, the temperature jacobians must be adjusted. So a warning if you plan to combine RH with temperature retrievals. If not, you can do a trick that I have used when trying out some RH retrievals. Set the a priori profile to match 50% RH. If you use rel, and the retrieved value is 2, you have a RH of 100% etc. You can of course also use logrel, but then 50% and 100% RH corresponds to 0 and log(2), respectively. And if using RH, an important aspect is how to treat the stratosphere. RH works poorly above the tropopause. Bye, Patrick On 06/10/15 10:07, Pauline Martinet wrote: > Hi everybody, > > I am not sure about something. > > I am using qpack2 to retrieve humidity profile. > > I would like to do the retrieval on log of relative humidity. I can see > this option in the documentation I just have to > change Unit from vmr to relative humidity. > > However, does it mean the humidity profile provided to ARTS through > qpack (Q.ABS_SPECIES(2).ATMDATA.DATA field) should also be given in log > relative humidity ? > > Thank you very much for this information. > > 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 > <https://www.sites.google.com/site/martinetpauline31/> > > > > _______________________________________________ > qpack mailing list > [email protected] > https://www.sat.ltu.se/mailman/listinfo/qpack > _______________________________________________ qpack mailing list [email protected] https://www.sat.ltu.se/mailman/listinfo/qpack
