Global 1/2 Degree Gridded Meteorological VIC Forcing Data Set

1. Data Sources

This data set is from 1/1/1948 to 10/31/2007 generated using monthly precipitation (P) from the University of Delaware (UDel) Willmott and Matsura (2007) gridded observation. Gauge Precipitation adjusted for gauge undercatch 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 from the Climate Research Unit (CRU) of the University of Eastern Anglia (Mitchell et al., 2004). Wind speed data was obtained from 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 temperatures) and Udel (for P) data as a control.

** This section provides only a very brief description of each data source for the data set. For a full explanation, the user need refer to the published papers in the references **

2. References to Cite

We request that users of this data set cite Adam and Lettenmaier 2003 and Adam et al. 2006 in any reports or publications using it.

Adam, J.C. and D.P. Lettenmaier, 2003: Adjustment of global gridded precipitation for systematic bias, J. Geophys. Res., 108(D9), 1-14, doi:10.1029/2002JD002499.

Adam, J.C., E.A. Clark, D.P. Lettenmaier, and E.F. Wood, 2006: Correction of Global Precipitation Products for Orographic Effects, J. Clim., 19(1), 15-38, doi: 10.1175/JCLI3604.1.

3. Data Set

This data set is available in both netCDF (which cannot be read directly by VIC) and ascii single grid cell (which VIC can read directly) formats.


Please click the year number in the table below to download the corresponding months. Please also read the readme file.
1948 1949 1950 1951 1952 1953 1954 1955 1956 1957
1958 1959 1960 1961 1962 1963 1964 1965 1966 1967
1968 1969 1970 1971 1972 1973 1974 1975 1976 1977
1978 1979 1980 1981 1982 1983 1984 1985 1986 1987
1988 1989 1990 1991 1992 1993 1994 1995 1996 1997
1998 1999 2000 2001 2002 2003 2004 2005 2006 2007

Ascii (Single grid cell)

Each ascii forcing file contains a complete timeseries for a single grid cell; the latitude and longitude of the grid cell center is in the filename. We have grouped these files into 5x5-degree boxes, and archived each box as a compressed tar file. You can access the tar files here. Please also read the readme file.