Daily Precipitation Grids for South America
- South American gridded daily precipitation from station observations, on 1.0 and 2.5 degree grids.
Sample products computed from this data set:
- Typical spatial coverage is illustrated. Values are in millimeters.
- The figure on the right is made with interpolated contour lines.
- Historical daily precipitation observations from South American meteorological stations are combined into daily gridded fields. Station data sets from numerous sources are included.
- Stations within a given radius of each grid point are combined by simple averaging with equal weighting. The chosen radius is 0.75 times the grid spacing. E.g., each point on the 1 degree grid includes data from stations within 0.75 degrees of the nominal coordinates of that grid point.
- If there are no observations within the radius on any day, a missing value is inserted for that grid point.
- Due to the scarcity of observations, coverage over the Andes mountains is not representative.
- For further details of the gridding technique,
see Note by Liebmann and Allured (citation below):
Full text of published article (PDF)
- Sample FORTRAN code to read data from a similar NetCDF file:
- SA24, 9 May 2013
- Daily gridded precipitation for South America on 1 degree and 2.5 degree grids.
- Daily counts of the number of observations included in each grid point value.
- 15°N - 60°S
- 85°W - 30°W
- Land areas only.
- Currently, January 1940 to April 2012.
- This is sparse data, limited to land areas and available historical records only.
- See headers of NetCDF files for missing value codes.
- NetCDF format, all dates included within one file, for each resolution.
- 1.0 degree file: 675 Mb.
- 2.5 degree file: 113 Mb.
Name and date of current version:
Dataset format and size:
- We request that the following article be cited if these data sets are
used in publication:
Liebmann, B., and D. Allured, 2005: Daily precipitation grids for South America. Bull. Amer. Meteor. Soc., 86, 1567-1570.
Changes in methodology from that described in Liebmann and Allured:
- As of version SA18, averaging of station data at identical coordinates is now incorporated as described.
Primary Data Sources:
- Administración Provincial de Agua (Chaco Province, Argentina)
- Agência Nacional de Águas (Brasil)
- Agência Nacional de Energia Elétrica (Brasil)
- C.T.M. Salto Grande
- DAEE (São Paulo, Brasil)
- Fundação Cearense de Meteorologia e Recursos Hídricos (Ceará, Brasil)
- Meteorologische Dienst Suriname
- Ministerio del Ambiente y los Recursos Naturales (Venezuela)
- National Climatic Data Center (USA)
- Servicio Meteorologico Nacional de Argentina
- Servicio Meteorologico Nacional de Paraguay
- Servicio Meteorologico Nacional de Uruguay
- Superintendência de Desenvolvimento do Nordeste (Brasil)
- Sistema Meteorológico do Paraná (Paraná, Brasil)
- U.T.E. Uruguay
- Any contributions of data would be welcomed.
- Data will be updated as time and resources allow.
- Suggestions would be useful and appreciated.
- Please send electronic mail to Brant Liebmann with data set requested, and a paragraph stating the intended use and the name and location of your institution.