Land Surface Evaporation from Reanalysis and Modeling

First we will present our recent progress in land surface evaporation estimation from various global reanalysis datasets. Results from the NCEP/NCAR, ERA40, NASA MERRA, NCEP CFS, and ECMWF Interim reanalyses will be compared with in situ measurements from extensive flux tower sites.

Surface evaporation can be partitioned into three components: transpiration from dry canopy by extracting soil water in the vegetation rooting zone, bare soil evaporation, and evaporation of canop-intercepted precipitation. In the second part of this presentation, we will discuss the impact of land model parameterizations and the numerical solution on this partitioning using the NCAR Community Land Model.