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*** Atmospheric CO2 concentrations (ppmv) derived from flask air   ***
*** samples collected at Manua Loa, Hawaii, USA                    ***
*** Source: L.P. Steele                                            ***
***              P.B. Krummel                                      ***  
***              R. L. Langenfelds,                                ***
***              Atmospheric, Research, Commonwealth Scientific,   ***
***              And Industrial Research Organisation,             ***
***              Aspendale, Victoria,                              *** 
***              Australia  3195                                   ***                   
***                                                                ***   
*** December 2002                                                  ***
***                                                                ***
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	Jan.	Feb.	Mar. 	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Ann.  Ave.
1991						357.82	355.97	353.63	351.86	352.33	354.13	355.53	
1992	356.54	357.45	358.68	359.25	359.57	358.98	356.6	354.76	353.83	353.74	354.58	355.95	356.66
1993	357.25	357.98	358.57	359.19	359.74	359.44	357.69	354.9	353.21	353.77	355.35	356.85	357
1994	357.56	357.88	359.12	360.8	361.36	360.67	359.49	357.63	355.37	355	356.76	358.49	358.34
1995	359.66	361	362.18	362.87	363.97	363	360.3	360.31	360.1	358.64	359.33	360.5	360.99
1996	361.26	362.47	363.56	364.26	364.9	364.6	362.62	360.63	359.4	359.16	360.51	362.25	362.14
1997	362.96	363.26	364.74	366.47	366.66	365.39	363.82	362.11	360.28	360.55	362.72	364.18	363.6
1998	364.79	365.79	367.48	369.06	369.46	368.3	366.81	365.36	363.69	363.88	365.67	367.04	366.44
1999	367.84	368.42	369.56	370.64	370.3	369.61	368.67	366.57	364.81	365.02	366.56	367.87	367.99
2000	369.09	370.35	371.28	371.6	371.61	371.34	369.89	367.99	366.64	366.92	368.38	369.39	369.54
2001	370.38	371.56	372.73	373.87	374.18	373.15	371.07	369.04	367.79	368.19	370.09	371.42	371.12

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.