Hello,
Here again. First of all congratulations for such nice GSI user guide, it is really clear and useful.
Secondly, I only want to confirm my thoughts. I have downloaded, compiled and ran the "reference" analysis for WRF-ARW, with GSI, using only conventional obs, and it seems I am running a 3DVAR Upper Air analysis were the updated variables are U,V,Q,T and PS in all the vertical levels. I have computed analysis increments and I don't see any update for any other variable, in particular, T2m, Q2m and Soil Temperature and Humidity.
My thought I would like someone to confirm (if possible) is that GSI does not update soil variables (and probably T2m/Q2m) in the analysis step, correct? E.g, these variables are only updated during the forecast step?
A related question is, specially for people who is running GSI operationally, do you think this "reference" 3DVAR configuration is the optimal for your operational runs? I mean if you run 3DVAR... In principle I want to stay with 3DVAR, not to go to 4DVAR or Hybrid methods.
Many thanks!!
Pau
Here again. First of all congratulations for such nice GSI user guide, it is really clear and useful.
Secondly, I only want to confirm my thoughts. I have downloaded, compiled and ran the "reference" analysis for WRF-ARW, with GSI, using only conventional obs, and it seems I am running a 3DVAR Upper Air analysis were the updated variables are U,V,Q,T and PS in all the vertical levels. I have computed analysis increments and I don't see any update for any other variable, in particular, T2m, Q2m and Soil Temperature and Humidity.
My thought I would like someone to confirm (if possible) is that GSI does not update soil variables (and probably T2m/Q2m) in the analysis step, correct? E.g, these variables are only updated during the forecast step?
A related question is, specially for people who is running GSI operationally, do you think this "reference" 3DVAR configuration is the optimal for your operational runs? I mean if you run 3DVAR... In principle I want to stay with 3DVAR, not to go to 4DVAR or Hybrid methods.
Many thanks!!
Pau