Hi I asked an expert and…
I asked an expert and they replied
"I have seen comparisons between NWP, radar and satellites. In the mid-latitudes,
the NWP does pretty good. (R1 is pretty old and low resolution, so it wouldn't do as well.)
I am not sure how much CMAP uses R1. Anyways any comparison would be useless
unless it was done on the same time scale (CMAP is pentad average), on a similar grid."
NCEP/NCAR Reanalysis Precipitation uncertainty
Working currently on Precipitation Data of CMAP which use NCEP/NCAR Reanalysis for worldwide date, I would like to find the uncertainty that could appears with the interpolation models used, in the forms of correlation (like r² fitting) with verification buoy for example.
Thank you in advance for your answer.