Northern Hemisphere Temperature Reconstructions: readme file
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               World Data Center A- Paleoclimatology
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NOTE: PLEASE CITE ORIGINAL REFERENCES WHEN USING THIS DATA!!!!!

CONTRIBUTORS: Keith R. Briffa, Philip D. Jones, Fritz H. Schweingruber,
Timothy J. Osborn.

NAME OF DATA SET:  Northern Hemisphere Temperature Reconstructions

IGBP PAGES/WDCA CONTRIBUTION SERIES NUMBER: 1998-022

SUGGESTED DATA CITATION: Briffa, et al, 1998, 
Northern Hemisphere Temperature Reconstructions.  
IGBP PAGES/World Data Center-A for Paleoclimatology 
Data Contribution Series #98-022.  
NOAA/NGDC Paleoclimatology Program, Boulder CO, USA.

ORIGINAL REFERENCES:
Briffa K.R., P.D. Jones, F.H. Schweingruber and T.J. Osborn (1998)
Influence of volcanic eruptions on Northern Hemisphere summer temperature
over the past 600 years. Nature 393, 450-455.

FUNDING SOURCES:
National Science Foundation, Switzerland
European Community
Department of Energy, United States
Natural Environment Research Council, United Kingdom

LAST UPDATE:  7/2003 (Addition of tables 1 & 2, volcanic eruptions data)
GEOGRAPHIC REGION: Northern Hemisphere 
PERIOD OF RECORD: 1400-1994 A.D. 

LIST OF FILES: NHemTemp.readme.txt (this file), NHemTemp.data.txt.

DESCRIPTION:
The data consists of two timeseries representative of Northern Hemisphere 
growing season temperatures for the period 1400-1994, derived from means of 
383 maximum latewood density chronologies from the northern Boreal forest.  
Both series are given in dimensionless standardised anomalies, and one has 
also been rescaled to give an estimate of Northern Hemisphere land and marine
temperature anomalies.

The timeseries are:
NHD1 (dimensionless) Two-stage average of Northern Hemisphere maximum
latewood density tree-ring chronologies.
NHLMT (degrees Celsius anomalies, with respect to the 1881-1960 mean)
Estimate of Northern Hemisphere land and marine growing-season
(April-September) temperature anomalies based on NHD1.
NHD2 (dimensionless) One-stage average of Northern Hemisphere maximum
latewood density tree-ring chronologies.