Northern Hemisphere Temperature Reconstruction for the Past Millennium: Readme file
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               World Data Center A- Paleoclimatology
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NOTE: PLEASE CITE CONTRIBUTORS WHEN USING THIS DATA!!!!!


NAME OF DATA SET: Northern Hemisphere Temperature Reconstruction for the Past Millennium.
LAST UPDATE: 3/1999 (Original Receipt by WDCA Paleo)  
CONTRIBUTORS: Michael E. Mann, Raymond S. Bradley, and Malcolm K. Hughes. 

IGBP PAGES/WDCA CONTRIBUTION SERIES NUMBER: 1999-014
SUGGESTED DATA CITATION: 
Michael E. Mann, Raymond S. Bradley, and Malcolm K. Hughes, 1999, 
Northern Hemisphere Temperature Reconstruction for the Past Millennium,
IGBP PAGES/World Data Center-A for Paleoclimatology 
Data Contribution Series # 1999-014.  
NOAA/NGDC Paleoclimatology Program, Boulder CO, USA.

ORIGINAL REFERENCE: 
Michael E. Mann, Raymond S. Bradley, and Malcolm K. Hughes, 1999,
Northern Hemisphere Temperatures During the Past Millennium: 
Inferences, Uncertainties, and Limitations, 
Geophysical Research Letters Vol. 26 , No. 6 , p. 759, March 15, 1999.

GEOGRAPHIC REGION: Global
PERIOD OF RECORD: AD 1000- AD 1998 
LIST OF FILES: Readme.mann1999.txt (this file), proxy data files
fenno-new.dat, npatagonia.dat, tasmania.dat, fran010.txt, quelc1-accum.dat,
urals-new.dat, itrdb-namer-pc1.dat, quelc1-o18.dat, westgreen-o18.dat,
itrdb-namer-pc2.dat, quelc2-accum.dat, itrdb-namer-pc3.dat, quelc2-o18.dat,
reconstruction files nhem-raw.dat, nhem-standerr-labeled.dat, nhem-recon.dat.

DESCRIPTION: 
Abstract: 
Building on recent studies, we attempt hemispheric temperature 
reconstructions with proxy data networks for the past millennium. We focus 
not just on the reconstructions, but the uncertainties therein, and 
important caveats. Though expanded uncertainties prevent decisive 
conclusions for the period prior to AD 1400, our results suggest that the 
latter 20th century is anomalous in the context of at least the past 
millennium. The 1990s was the warmest decade, and 1998 the warmest year, 
at moderately high levels of confidence. The 20th century warming counters 
a millennial-scale cooling trend which is consistent with long-term 
astronomical forcing.