**********************************************************************
*** Delta C-13 values (per mil) derived from CO2 in flask air      ***
*** samples collected at Mawson, 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			-7.826	-7.837	-7.849	-7.847	-7.847	-7.86	-7.858	-7.852	-7.857	-7.849	
1991	-7.836	-7.816	-7.787	-7.793	-7.814	-7.822	-7.836	-7.855	-7.85	-7.834	-7.831	-7.829	-7.825
1992	-7.817	-7.8	-7.785	-7.782	-7.786	-7.794	-7.813	-7.841	-7.842	-7.826	-7.815	-7.783	-7.807
1993	-7.774	-7.794	-7.792	-7.785	-7.787	-7.791	-7.804	-7.831	-7.84	-7.829	-7.83	-7.833	-7.808
1994	-7.833	-7.84	-7.829	-7.803	-7.811	-7.83	-7.829	-7.858	-7.877	-7.852	-7.848	-7.857	-7.839
1995	-7.857	-7.858	-7.851	-7.864	-7.877	-7.856	-7.86	-7.899	-7.911	-7.894	-7.899	-7.899	-7.877
1996	-7.886	-7.874	-7.856	-7.863	-7.891	-7.88	-7.869	-7.883	-7.873	-7.875	-7.894	-7.89	-7.878
1997	-7.88	-7.899	-7.913	-7.914	-7.92	-7.915	-7.918	-7.941	-7.951	-7.955	-7.964	-7.964	-7.928
1998	-7.949	-7.924	-7.913	-7.927	-7.949	-7.958	-7.969	-7.984	-7.983	-7.981	-7.994	-7.995	-7.961
1999	-7.983	-7.983	-7.986	-7.988	-7.989	-7.981	-7.983	-8.001	-8.001	-8.003	-8.018	-8.014	-7.994
2000	-8	-7.997	-7.994	-7.981	-7.969	-7.969	-7.978	-7.99	-7.991	-7.998	-8.001	-7.993	-7.988
2001	-7.99	-7.976	-7.957	-7.954	-7.956	-7.959	-7.971	-7.983	-7.99	-7.999	-8.016	-8.025	-7.981


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.