Why are there sometimes negative humidity values in the Reanalysis fields?
[1/13/98] There is a discussion of this issue by Wesley Ebisuzaki (NCEP) available at negative.h2o. • How are the soil layer structured?[12/2/97] The soil model consists of 3 layer: LayerDepthGRIB DescriptionAbbreviationComment Top0 – 10 cm 0-10cm 10.dlr Middle10 – 200 cm 10-200cm200.dlr Bottom200 – 400 cm300cm 300.dpl Defined as a level in GRIB, it actually represents a layer • How are temperatures of soil layers handled?[12/2/97] The annual cycle in the soil temperature decreases in amplitude with depth. The model assumes that the bottom layer has no time variations of temperature (not a bad assumption). The temperature of the bottom layer is set to the annual-mean surface temperature climatology so that the net heat flux from the bottom layer should approach zero. (Wesley Ebisuzaki, NCEP) • How useful are upper level specific humidity fields on sigma surfaces?[11/15/97] The higher levels in this stack do not contain sufficient precision for many applications. For levels above the 0.
