Provided by reanalysis and modeled climates.
The meteorological forcing data for the VIC model, precipitation, maximum temperature, minimum temperature and wind speed are prepared as follows. Monthly precipitation (P) was obtained from the University of Delaware (UDel) Willmott and Matsura (2007) gridded observation. Gauge Precipitation adjusted for gauge under catch as described by Adam and Lettenmaier (2003) and for orographic effects as described by Adam et al. (2006). Monthly gridded minimum and maximum temperatures were obtained the Climate Research Unit (CRU) of the University of Eastern Anglia (Mitchell et al., 2004). Wind speed data was obtained NCEP-NCAR reanalysis (Kalnay et al. 1996).
The daily variability of NCEP/NCAR is used to create daily P and temperatures data using monthly CRU (for temperature) and Udel (for P) data as a control. So, for a given month the daily precipitation varies like the NCEP/NCAR data while the amount is controlled by (add up to) that month's U-Delaware precipitation. The data prepared using the above mentioned steps are of 0.5 degree resolution. Those data were interpolated to 1/4 grid cells using inverse distance interpolation. Temperature data were interpolated using a lapse rate of -6.5 °C per km to adjust temperature from the 0.5 degree grid cell to each elevation of the 1/4 grid cell
Scenarios of possible future climates were derived from a multi (7)- model ensemble, for IPCC A2 and B1 Emissions Scenarios of average projected changes: Base (1960-2000), 2010-39, 2040-69, 2070-2100. (see under Cliamte Scenarios, under Water Movement).