Deglacial 14C Calibration: Readme file
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               World Data Center A- Paleoclimatology
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NOTE: PLEASE CITE ORIGINAL REFERENCE WHEN USING THIS DATA!!!!!


CONTRIBUTOR: Konrad Hughen, Harvard University.
IGBP PAGES/WDCA CONTRIBUTION SERIES NUMBER: 97-027
NAME OF DATA SET: Deglacial 14C Calibration
LAST UPDATE: 2/99 (addition of files PC56.greyscale.age.data.txt and 
PC56.greyscale.age.xls)

ORIGINAL REFERENCES:
Hughen, K.A., Overpeck, J.T., Lehman, S.J., Kashgarian, M., Southon, J. and 
Peterson, L.C., 1998, A New 14C Calibration Data Set for the Last Deglaciation,  
Radiocarbon 39, 483-494.

Hughen, K.A., Overpeck, J.T., Lehman, S.J., Kashgarian, M., Southon, J., 
Peterson, L.C., Alley, R., and Sigman, D.M., 1998, Deglacial changes in 
Ocean Circulation from an extended radiocarbon calibration,
Nature 391, pp. 65-68, 1 January 1998.

SUGGESTED DATA CITATION:
Hughen, K., 1997, Deglacial 14C Calibration.  IGBP PAGES/World Data
Center-A for Paleoclimatology Data Contribution Series #97-027.  NOAA/NGDC
Paleoclimatology Program, Boulder CO, USA.

GEOGRAPHIC REGION: Global
PERIOD OF RECORD: 9900-14500 YBP.
LIST OF FILES: Hughen1998.readme(this file), splinedata.txt(Tab-delimited text),
splinedata.xls (Microsoft Excel format).
DESCRIPTION: 
Files splinedata.txt and splinedata.xls contain raw Cariaco Basin 14C dates 
with their varve (calendar) ages, in addition to a decadally sampled spline 
data set that is fitted to the raw data and provides a continuous calibration curve.

Files PC56.greyscale.age.data.txt and PC56.greyscale.age.xls were added to 
the archive in February 1999.  These data supercede the calendar age model shown 
(but no data provided) in the Hughen, 1996 paper, which was not based on calendar 
varves but only CALIB-calibrated 14C dates.
THE 14C AGE SCALE IS ONLY A SUBJECTIVELY INTERPRETED AGE MODEL! It by 
neccesity has to smooth out reversals and plateaus, and therefore the 
14C and calendar age scales can't be plotted together to be used for 
14C calibration. The 14C and calendar age scales are only provided 
for comparison to other 14C-dated (ibid) paleoclimate records.