**********************************************************************
*** Atmospheric CO2 concentrations (ppmv) derived from flask air   ***
*** samples collected at Mawson, Antarctica                        ***
*** Source: L.P. Steele                                            ***
***              P.B. Krummel                                      ***  
***              R. L. Langenfelds,                                ***
***              Atmospheric, Research, Commonwealth Scientific,   ***
***              And Industrial Research Organisation,             ***
***              Aspendale, Victoria,                              *** 
***              Australia  3195                                   ***                   
***                                                                ***   
*** December 2002                                                  ***
***                                                                ***
**********************************************************************

	Jan. 	Feb.	Mar. 	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Ann. Avg.
1990												353.4	
1991	353.23	352.54	352.12	352.36	352.72	352.98	353.47	354.02	354.14	353.94	353.62	353.35	353.21
1992	353.18	352.89	352.77	352.83	353.05	353.73	354.47	354.87	354.91	355.02	355.1	354.88	353.98
1993	354.64	354.47	354.29	354.36	354.6	354.62	354.92	355.72	356.06	355.92	355.82	355.59	355.08
1994	355.23	355.03	355.11	355.33	355.47	355.78	356.14	356.73	357.21	357.22	357.25	357.31	356.15
1995	357.26	357.14	357.04	357.22	357.61	357.94	358.25	358.72	359.06	359.15	359.2	359.16	358.15
1996	359	358.87	358.87	358.83	359.08	359.41	359.69	360.15	360.37	360.36	360.33	360.29	359.6
1997	360.32	360.08	359.87	360.17	360.64	361	361.31	361.82	362.27	362.43	362.45	362.4	361.23
1998	362.33	362.09	361.97	362.31	362.84	363.35	363.94	364.5	364.78	364.8	364.87	364.98	363.56
1999	364.76	364.44	364.34	364.49	364.88	365.23	365.53	366.03	366.4	366.48	366.49	366.43	365.46
2000	366.1	365.71	365.55	365.67	366	366.25	366.63	367.12	367.38	367.41	367.39	367.47	366.56
2001	367.42	367.19	367.11	367.3	367.47	367.72	368.36	368.9	369.14	369.38	369.52	369.4	368.24

Monthly values are expressed in parts per million (ppm) and reported in the WMO CO2 
Mole Fraction Scale (Zhao et al., 1997, J. Geophys. Res. 102 , 5885-5894). Monthly 
values are calculated as the mean of the daily values from a smooth curve fit to the data 
using 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.