******************************************************************* *** La Jolla Pier, California 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 Dioxide5 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 1978 99.999 99.999 99.999 -7.820 99.999 -7.638 99.999 -7.311 -7.227 99.999 -7.553 99.999 99.999 99.999 1979 -7.718 -7.843 99.999 -7.953 99.999 99.999 99.999 -7.429 99.999 99.999 99.999 99.999 99.999 -7.676 1980 99.999 99.999 -7.772 99.999 99.999 99.999 99.999 -7.359 99.999 -7.578 99.999 -7.727 99.999 -7.704 1981 -7.847 -7.894 99.999 99.999 -7.919 99.999 -7.490 -7.441 -7.397 -7.548 -7.659 -7.818 99.999 -7.713 1982 -7.859 99.999 -7.825 99.999 -8.012 -7.766 99.999 99.999 -7.383 99.999 -7.714 -7.797 99.999 -7.717 1983 -7.815 -7.892 -7.882 -7.917 99.999 -7.792 -7.655 -7.394 -7.484 99.999 -7.617 -7.840 (-7.740) -7.798 1984 99.999 -7.888 -8.048 -8.060 -8.089 -7.912 -7.662 -7.389 -7.503 -7.648 -7.757 -7.931 (-7.816)(-7.744) 1985 -7.886 -7.936 -7.904 -7.876 -7.951 -7.929 -7.583 -7.362 -7.328 -7.644 -7.736 99.999 (-7.744) -7.754 1986 99.999 -7.932 -7.886 -7.796 -7.920 -7.815 -7.531 99.999 -7.344 99.999 -7.630 99.999 99.999 -7.710 1987 -7.796 -7.822 -7.894 -7.948 -8.010 -7.947 -7.672 -7.394 -7.571 -7.560 -7.791 -7.874 -7.773 -7.766 1988 -7.894 -7.948 -7.978 -8.044 -8.080 -7.968 -7.776 -7.538 -7.638 -7.735 -7.884 99.999 (-7.870) -7.867 1989 99.999 99.999 -7.986 -8.136 -8.151 -7.994 -7.645 -7.440 -7.580 -7.753 -7.859 -7.858 (-7.871) -7.891 1990 -8.030 -8.075 -8.129 -8.069 -8.097 -7.952 -7.685 -7.540 -7.614 -7.743 -7.858 -7.891 -7.890 -7.888 1991 99.999 -8.024 -8.086 -8.100 -8.148 -7.997 -7.814 -7.523 -7.578 -7.750 -7.989 -7.970 (-7.916) -7.907 1992 -8.030 -8.029 -8.066 -8.093 -8.154 -8.004 -7.697 -7.564 -7.537 -7.759 99.999 -7.976 (-7.899) -7.902 1993 -8.061 -8.047 -8.077 -8.051 -8.098 -7.991 -7.679 -7.514 -7.553 -7.694 -7.844 -8.016 -7.885 -7.888 1994 -7.997 -8.037 -8.090 -8.166 -8.192 -8.040 -7.815 -7.601 -7.571 -7.814 -7.973 -8.100 -7.950 -7.948 1995 -8.091 -8.170 -8.180 -8.189 -8.220 -8.128 -7.849 -7.627 -7.751 -7.844 -7.957 99.999 (-8.008) -8.007 1996 -8.152 -8.168 -8.199 -8.228 -8.211 -8.109 -7.824 -7.717 -7.717 -7.879 -8.058 99.999 (-8.030) -8.007 1997 -8.196 -8.178 -8.171 -8.197 -8.237 -8.114 -7.842 -7.606 -7.696 -7.845 -8.040 -8.134 -8.021 -8.023 1998 -8.120 -8.181 -8.196 -8.327 -8.287 -8.141 -7.950 -7.765 -7.838 -8.032 99.999 -8.269 (-8.103) -8.100 1999 -8.255 -8.327 -8.323 -8.389 -8.368 -8.234 -7.930 -7.833 -7.734 -7.954 -8.079 -8.162 -8.132 -8.135 2000 -8.122 -8.277 -8.316 -8.332 -8.335 -8.176 -7.901 -7.705 -7.744 -7.980 -8.129 -8.109 -8.094 -8.102 2001 -8.165 -8.252 -8.282 -8.361 -8.386 -8.212 -7.854 -7.776 -7.749 -7.927 99.999 -8.202 (-8.105) -8.108 2002 -8.258 -8.272 -8.328 -8.314 -8.358 -8.180 -7.998 -7.680 -7.879 -8.028 -8.087 -8.276 -8.138 -8.147 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 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.