# --------------------------------------------------------------------
# USE OF NOAA ESRL DATA
# 
# These data are made freely available to the public and the
# scientific community in the belief that their wide dissemination
# will lead to greater understanding and new scientific insights.
# The availability of these data does not constitute publication
# of the data.  NOAA relies on the ethics and integrity of the user to
# assure that ESRL receives fair credit for their work.  If the data 
# are obtained for potential use in a publication or presentation, 
# ESRL should be informed at the outset of the nature of this work.  
# If the ESRL data are essential to the work, or if an important 
# result or conclusion depends on the ESRL data, co-authorship
# may be appropriate.  This should be discussed at an early stage in
# the work.  Manuscripts using the ESRL data should be sent to ESRL
# for review before they are submitted for publication so we can
# insure that the quality and limitations of the data are accurately
# represented.
# 
# Contact:   Pieter Tans (303 497 6678; pieter.tans@noaa.gov)
# 
# File Creation:  Wed Jun  4 10:39:59 2008
# 
# RECIPROCITY
# 
# Use of these data implies an agreement to reciprocate.
# Laboratories making similar measurements agree to make their
# own data available to the general public and to the scientific
# community in an equally complete and easily accessible form.
# Modelers are encouraged to make available to the community,
# upon request, their own tools used in the interpretation
# of the ESRL data, namely well documented model code, transport
# fields, and additional information necessary for other
# scientists to repeat the work and to run modified versions.
# Model availability includes collaborative support for new
# users of the models.
# --------------------------------------------------------------------
#  
#  
# See www.esrl.noaa.gov/gmd/ccgg/trends/ for additional details.
#  
# Data from March 1958 to April 1974 have been obtained by C. David Keeling
# of the Scripps Institution of Oceanography (SIO) and were copied from the
# archive maintained by the Carbon Dioxide Information Analysis Center (CDIAC).
#
# The estimated uncertainty in the annual mean is the standard deviation
# of the differences of annual mean values determined independently by
# NOAA/ESRL and the Scripps Institution of Oceanography.
#
# NOTE: In general, the data presented for the last year are subject to change, 
# depending on recalibration of the reference gas mixtures used, and other quality
# control procedures. Occasionally, earlier years may also be changed for the same
# reasons.  Usually these changes are minor.
#
# year     mean      unc
  1959   315.98     0.12
  1960   316.91     0.12
  1961   317.65     0.12
  1962   318.45     0.12
  1963   318.99     0.12
  1964   319.61     0.12
  1965   320.03     0.12
  1966   321.37     0.12
  1967   322.18     0.12
  1968   323.05     0.12
  1969   324.62     0.12
  1970   325.68     0.12
  1971   326.32     0.12
  1972   327.46     0.12
  1973   329.68     0.12
  1974   330.17     0.12
  1975   331.09     0.12
  1976   332.06     0.12
  1977   333.78     0.12
  1978   335.40     0.12
  1979   336.78     0.12
  1980   338.70     0.12
  1981   340.11     0.12
  1982   341.21     0.12
  1983   342.84     0.12
  1984   344.40     0.12
  1985   345.87     0.12
  1986   347.19     0.12
  1987   348.98     0.12
  1988   351.45     0.12
  1989   352.89     0.12
  1990   354.16     0.12
  1991   355.49     0.12
  1992   356.27     0.12
  1993   356.96     0.12
  1994   358.63     0.12
  1995   360.62     0.12
  1996   362.37     0.12
  1997   363.47     0.12
  1998   366.50     0.12
  1999   368.14     0.12
  2000   369.41     0.12
  2001   371.07     0.12
  2002   373.16     0.12
  2003   375.80     0.12
  2004   377.55     0.12
  2005   379.75     0.12
  2006   381.85     0.12
  2007   383.72     0.12