Large Scale Climate Reconstructions from Tree-Rings: File recon.readme
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               World Data Center A- Paleoclimatology
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NOTE: PLEASE CITE ORIGINAL REFERENCE WHEN USING THIS DATA!!!!!

CONTRIBUTOR: H.C Fritts, LTRR, University of Arizona 
NAME OF DATA SET:  Large Scale Climate Reconstructions from Tree-Rings
IGBP PAGES/WDCA CONTRIBUTION SERIES NUMBER:  91-011
SUGGESTED DATA CITATION: Fritts, H.C., 1991, Large Scale 
Climate Reconstructions from Tree-Rings.  International Tree-Ring Data Bank.
IGBP PAGES/World Data Center-A for Paleoclimatology Data Contribution 
Series #91-011.  NOAA/NGDC Paleoclimatology Program, Boulder CO, USA.

LAST UPDATE:  11/91 
GEOGRAPHIC REGION: North America
PERIOD OF RECORD:  1602 A.D. - 1960 A.D.

LIST OF FILES: Readme, Program.zip (contains 10 display software program files),
20 R*.dat files of precipitation reconstructions, 20 T*.dat data files of 
temperature reconstructions.  

The program files have been compressed using the utility PKZIP,
and must be expanded before use.  Two versions of the DOS display 
program DIFMAP are in the file; if your PC is a 386 or lower and 
lacks a math coprocessor, type NOCOPRO to make the non-coprocessor 
version active.  

DESCRIPTION:
This data set contains files of reconstructed temperature and 
precipitation data, derived from tree ring data by Dr. Harold 
Fritts of the University of Arizona.  The reconstructions were 
made for a network of weather observation stations in the 
United States.  For a discussion of the methodology of climate 
reconstructions, and potential limits in their application, 
please consult the original reference.  The data are accompanied 
by DOS display software.  The DIFMAP program opens the data files 
and creates maps of reconstructed temperature or precipitation 
patterns, either on screen or as a printer file. The program 
SERIES displays reconstructed values for a single location, 
as a graph or a numerical table.  Documentation for the programs 
is in the files MANUAL.DOC and SERIES.DOC.  

Original Reference:
H.C. Fritts, 1991, RECONSTRUCTING LARGE-SCALE CLIMATIC PATTERNS 
FROM TREE RING DATA: A DIAGNOSTIC ANALYSIS, University of Arizona Press,
Tucson, AZ, USA.  ISBN 0-8165-1218-3