**********************************************************************
*** Delta C-13 values (per mil) derived from CO2 in flask air      ***
*** samples collected at Cape Grim, Australia                      ***
*** 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									-7.778	-7.782	-7.784	-7.797	
1991	-7.806	-7.781	-7.779	-7.842	-7.899	-7.872	-7.846	-7.857	-7.859	-7.855	-7.819	-7.803	-7.835
1992	-7.825	-7.823	-7.804	-7.795	-7.807	-7.827	-7.828	-7.8	-7.797	-7.821	-7.835	-7.828	-7.816
1993	-7.777	-7.755	-7.749	-7.732	-7.741	-7.764	-7.785	-7.811	-7.834	-7.836	-7.832	-7.83	-7.787
1994	-7.83	-7.829	-7.81	-7.795	-7.796	-7.805	-7.825	-7.844	-7.858	-7.863	-7.863	-7.864	-7.832
1995	-7.87	-7.871	-7.863	-7.85	-7.84	-7.857	-7.875	-7.881	-7.886	-7.887	-7.897	-7.916	-7.874
1996	-7.917	-7.905	-7.864	-7.842	-7.863	-7.875	-7.882	-7.892	-7.907	-7.911	-7.887	-7.873	-7.885
1997	-7.88	-7.858	-7.842	-7.877	-7.883	-7.864	-7.894	-7.902	-7.893	-7.917	-7.937	-7.932	-7.890
1998	-7.925	-7.922	-7.929	-7.945	-7.941	-7.94	-7.947	-7.94	-7.962	-7.978	-7.971	-7.98	-7.948
1999	-7.981	-7.969	-7.955	-7.944	-7.95	-7.961	-7.971	-7.984	-7.988	-7.997	-8.007	-7.986	-7.974
2000	-7.971	-7.968	-7.959	-7.951	-7.943	-7.948	-7.964	-7.976	-7.987	-7.982	-7.973	-7.98	-7.967
2001	-7.969	-7.959	-7.968	-7.97	-7.958	-7.949	-7.96	-7.986	-7.997	-7.998	-7.992	-7.987	-7.974


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.