********************************************************************** *** Delta C-13 values (per mil) derived from CO2 in flask air *** *** samples collected at the South Pole, Antarctica *** *** Source: C. E. Allison *** *** R. J. Francey *** *** P. B. Krummel *** *** Atmospheric, Research, Commonwealth Scientific, *** *** And Industrial Research Organisation, *** *** Aspendale, Victoria, *** *** Australia 3195 *** *** *** *** September 2003 *** *** *** ********************************************************************** Jan. Feb. Mar. Apr. May Jun. Jul. Aug. Sep. Oct. Nov. Dec. Ann. Ave. 1990 -7.693 -7.701 -7.71 -7.729 -7.745 -7.746 -7.75 -7.751 1991 -7.746 -7.777 -7.815 -7.819 -7.827 -7.839 -7.836 -7.846 -7.856 -7.846 -7.835 -7.821 -7.822 1992 -7.796 -7.786 -7.788 -7.786 -7.788 -7.787 -7.795 -7.821 -7.832 -7.826 -7.827 -7.81 -7.804 1993 -7.778 -7.771 -7.774 -7.783 -7.796 -7.798 -7.806 -7.823 -7.833 -7.845 -7.838 -7.814 -7.805 1994 -7.807 -7.815 -7.82 -7.811 -7.802 -7.802 -7.814 -7.83 -7.844 -7.852 -7.852 -7.848 -7.825 1995 -7.839 -7.849 -7.861 -7.85 -7.847 -7.85 -7.86 -7.875 -7.881 -7.878 -7.879 -7.878 -7.862 1996 -7.888 -7.902 -7.89 -7.868 -7.858 -7.867 -7.891 -7.899 -7.894 -7.901 -7.905 -7.905 -7.889 1997 -7.912 -7.905 -7.886 -7.883 -7.901 -7.904 -7.899 -7.908 -7.919 -7.93 -7.951 -7.951 -7.912 1998 -7.929 -7.934 -7.926 -7.908 -7.921 -7.939 -7.936 -7.951 -7.988 -8.002 -8.004 -8.006 -7.954 1999 -8 -7.985 -7.977 -7.982 -7.986 -7.98 -7.974 -7.984 -7.999 -8 -7.996 -8.001 -7.989 2000 -8 -7.992 -7.99 -7.979 -7.968 -7.965 -7.97 -7.991 -8.01 -8.01 -7.995 -7.977 -7.987 2001 -7.968 -7.983 -7.998 -7.972 -7.95 -7.954 -7.966 -7.992 -8.007 -8.011 -8.019 Monthly values (per mil) are reported on the international VPDB-CO2 scale. Monthly values were calculated as the mean of the daily values from a smooth curve fit to the data using the curve- fitting routines described by Thoning et al., 1989 (J. Geophys Res. 94, 8549-8565). Annual values are the arithmetic means of the 12 monthly values.