IN BOX INSIGHTS and INNOVATIONS BY BRANT LIEBMANN AND DAVE ALLURED gridded dataset of historical daily precipita- DATA . The gridded fields were constructed from about tion for South America is now available to the 7900 stations within 10,168 station data files. Most sta- Apublic. We believe this dataset is a substantial tion records (see Fig. 1) are shorter than the full 65-yr improvement over what heretofore has been easily period, with some missing observations within the accessible because it contains data from numerous available record. A given grid incorporates all station sources. These data have been combined in a simple observations available for that day. The idea is that with a manner into daily 1° and 2.5° gridded fields for the sufficient density o f stations, an occasional missing value will not substantially affect the gridpoint average. One period 1940-2003. must be careful, however, when using gridded fields The data should help to improve our understanding like these for studies such as trend analyses, which may of precipitation variability, a fundamental and difficult sensitively depend on the number and temporal homo- problem of meteorology and climatology. Rapid spatial geneity of stations averaged into a given grid point. and
Bulletin of the American Meteorological Society – American Meteorological Society
Published: Nov 1, 2005
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