******************************************************************* *** Christmas Island, Kiribati isotopic ratio of atmospheric *** *** 13C/12C (permil) averages of data adjusted to the *** *** 15th of each month *** *** Source: C.D. Keeling, A.F. Bollenbacher, and T.P. Whorf *** *** Carbon Dioxide Research Group *** *** Scripps Institution of Oceanography (SIO) *** *** University of California *** *** La Jolla, California USA 92093-0444 *** *** *** *** March 2005 *** *** *** ******************************************************************* Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Ave FitAve 1977 99.999 99.999 99.999 99.999 99.999 99.999 99.999 -7.504 -7.466 -7.446 -7.457 -7.431 99.999 99.999 1978 99.999 99.999 -7.481 -7.533 -7.537 99.999 -7.448 -7.480 -7.454 -7.455 -7.465 -7.499 99.999 -7.488 1979 99.999 -7.580 -7.548 -7.619 -7.586 -7.562 -7.490 -7.428 -7.424 -7.460 -7.530 -7.539 (-7.521) -7.529 1980 -7.592 -7.664 -7.667 -7.704 99.999 -7.687 99.999 -7.588 -7.557 -7.522 -7.543 -7.470 (-7.605) -7.589 1981 -7.560 -7.516 -7.677 -7.681 99.999 99.999 -7.583 -7.572 -7.581 -7.527 -7.584 -7.525 (-7.591) -7.589 1982 -7.554 -7.617 99.999 -7.650 -7.610 -7.759 -7.717 99.999 -7.525 99.999 99.999 -7.630 99.999 -7.622 1983 -7.599 -7.737 -7.736 -7.799 -7.802 -7.720 99.999 -7.596 -7.577 -7.706 -7.574 -7.550 (-7.673) -7.672 1984 99.999 -7.604 -7.786 -7.711 -7.760 -7.744 -7.646 -7.640 -7.690 -7.568 -7.560 -7.558 (-7.660) -7.659 1985 -7.636 -7.640 -7.641 -7.791 -7.774 -7.655 -7.633 -7.580 -7.646 -7.559 -7.593 -7.539 -7.640 -7.630 1986 -7.551 -7.652 -7.643 -7.669 -7.619 -7.617 -7.619 -7.556 -7.630 -7.582 -7.577 -7.573 -7.607 -7.608 1987 -7.583 -7.586 -7.724 -7.714 -7.829 -7.728 -7.716 -7.694 -7.662 -7.668 -7.621 -7.696 -7.685 -7.685 1988 -7.719 -7.737 -7.811 -7.882 -7.883 -7.783 -7.813 -7.739 -7.744 -7.709 -7.716 99.999 (-7.774) -7.772 1989 99.999 -7.878 99.999 99.999 -7.837 -7.871 -7.822 -7.768 -7.703 -7.691 -7.714 -7.727 99.999 -7.791 1990 -7.762 -7.820 -7.899 -7.785 -7.811 -7.819 -7.812 -7.787 99.999 -7.742 -7.709 99.999 (-7.781) -7.770 1991 -7.731 -7.795 -7.758 -7.814 99.999 -7.834 -7.765 -7.688 -7.736 -7.709 -7.679 -7.765 (-7.758) -7.766 1992 -7.811 -7.879 -7.878 -7.872 99.999 -7.845 -7.787 -7.764 -7.721 -7.746 -7.732 -7.750 (-7.805) -7.799 1993 -7.781 -7.826 -7.837 -7.931 -7.917 -7.812 -7.772 -7.775 -7.737 -7.705 -7.743 -7.785 -7.802 -7.799 1994 -7.807 -7.798 -7.892 -7.957 -7.878 -7.868 -7.877 -7.894 -7.835 -7.811 99.999 99.999 (-7.855) -7.848 1995 99.999 99.999 99.999 99.999 99.999 99.999 -7.913 -7.866 -7.885 -7.839 99.999 -7.856 99.999 -7.899 1996 -7.851 -7.935 -7.984 99.999 -7.995 -7.922 -7.935 -7.921 99.999 99.999 99.999 99.999 99.999 -7.910 1997 -7.903 -7.960 -7.943 -7.958 99.999 -7.948 -7.960 -7.915 -7.893 -7.885 -7.855 -7.985 (-7.934) -7.938 1998 99.999 99.999 99.999 -8.162 99.999 -8.044 -8.032 -7.970 -7.968 -7.977 -7.978 -8.004 99.999 -8.014 1999 -8.024 -8.089 -8.085 -8.134 -8.034 -8.047 -8.030 -7.970 -8.015 -7.958 -7.982 -8.013 -8.032 -8.029 2000 -8.019 -8.029 -8.086 -8.152 -8.041 -8.058 -8.124 -7.998 -7.951 -7.994 -7.958 -8.052 -8.038 -8.040 2001 99.999 99.999 99.999 99.999 99.999 99.999 99.999 -7.994 99.999 99.999 99.999 99.999 99.999 -8.050 2002 99.999 99.999 99.999 99.999 -8.165 -8.092 99.999 -8.034 99.999 -8.012 -8.048 -8.060 99.999 -8.072 Monthly averages have been adjusted to the 15th of each month. Missing values are denoted by 99.999. Annual average data have been augmented (data in parentheses) when only 1 or 2 months are missing for that year, by substituting the monthly fit value(s) for missing (99.999) data and then averaging the 12 values. The month without data is still shown as 99.999 while this recomputed annual average is shown in parentheses. These monthly data have been adjusted from January 1992 to the present by adding -0.112 per mil.