1. Precip, Tmax, Tmin scaled to match CRU monthly data.
Global Historical Climatology Network (GHCN), Peterson et al., 1998
NCEP-NCAR Reanalysis
Corrected for rain biases
(Kalnay et al, 1996;
Sheffield et al, 2004)
CRU monthly Precip,
Temp, DTR
0.5º, Mitchell & Jones, 2005
Spatial disaggregation generally following Sheffield et al., 2006
Temperature disaggregated to
0.25º accounting for elevation
TRMM used to disaggregate
precipitation to 0.25º
Precip, Tmax, Tmin scaled to match CRU monthly data.
Gridded 0.25° VIC
meteorological data 1

2. The problem

3. Few mountain stations in CRU

4. Solution
Develop a set of 12 monthly climatological precipitation maps at 0.25 using DGA data
Base historical period (perhaps )
Include only stations with relatively complete records (maybe 75% complete and 20 years minimum)
Calculate the 12 monthly climatological precipitation values for the 0.25 gridded VIC data set
Scale the daily precipitation values in the 0.25 gridded VIC data set so they match long-term (climatological) monthly means.