A: I am not familiar enough with the Reanalysis dataset to answer your question and will have to refer you to the Reanalysis project and their documentation. You might find the following page helpful in some way:
http://dss.ucar.edu/datasets/ds090.0/docs/problems/problem-cld
Otherwise, I would direct you here:
http://dss.ucar.edu/pub/reanalysis/
If the documentation does not contain the answer to your
question, then you might try contacting the support people at the Reanalysis
project.
-- Michael Bell